auto commit
This commit is contained in:
CyC2018
396
notes/MySQL.md
396
notes/MySQL.md
@ -1,226 +1,226 @@
|
||||
<!-- GFM-TOC -->
|
||||
* [?<3F><>????](#?<3F><>????)
|
||||
* [<EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<23>洢<EFBFBD><E6B4A2><EFBFBD><EFBFBD>)
|
||||
* [1. InnoDB](#1-innodb)
|
||||
* [2. MyISAM](#2-myisam)
|
||||
* [3. InnoDB ?? MyISAM ????](#3-innodb-??-myisam-????)
|
||||
* [????????](#????????)
|
||||
* [1. ????](#1-????)
|
||||
* [2. ??????](#2-??????)
|
||||
* [3. ?????](#3-?????)
|
||||
* [4. ????????](#4-????????)
|
||||
* [????](#????)
|
||||
* [1. ????????](#1-????????)
|
||||
* [1.1 B-Tree ????](#11-b-tree-????)
|
||||
* [1.2 ???????](#12-???????)
|
||||
* [1.3. ????????????R-Tree??](#13-????????????r-tree??)
|
||||
* [1.4 ???????](#14-???????)
|
||||
* [2. ?????????](#2-?????????)
|
||||
* [3. ???????](#3-???????)
|
||||
* [3.1 ????????](#31-????????)
|
||||
* [3.2 ??????](#32-??????)
|
||||
* [3.3 ????????](#33-????????)
|
||||
* [3.4 ?????<3F><>????](#34-?????<3F><>????)
|
||||
* [3.5 ???????](#35-???????)
|
||||
* [3.6 ????????](#36-????????)
|
||||
* [4. B-Tree ?? B+Tree ???](#4-b-tree-??-b+tree-???)
|
||||
* [3. InnoDB <EFBFBD><EFBFBD> MyISAM <EFBFBD>ıȽ<EFBFBD>](#3-innodb-<EFBFBD><EFBFBD>-myisam-<EFBFBD>ıȽ<EFBFBD>)
|
||||
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<23><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [1. <EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#1-<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [2. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#2-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [3. <EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>](#3-<EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [4. ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#4-ʱ<><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [1. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#1-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [1.1 B-Tree <EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#11-b-tree-<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [1.2 <EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#12-<EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [1.3. <EFBFBD>ռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD>R-Tree<EFBFBD><EFBFBD>](#13-<EFBFBD>ռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>r-tree)
|
||||
* [1.4 ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#14-ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [2. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD>](#2-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD>)
|
||||
* [3. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD>](#3-<2D><><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD>)
|
||||
* [3.1 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#31-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [3.2 ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#32-ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [3.3 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#33-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [3.4 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>˳<EFBFBD><EFBFBD>](#34-<2D><><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>˳<EFBFBD><CBB3>)
|
||||
* [3.5 <EFBFBD>۴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#35-<EFBFBD>۴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [3.6 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#36-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [4. B-Tree <EFBFBD><EFBFBD> B+Tree ԭ<EFBFBD><EFBFBD>](#4-b-tree-<EFBFBD><EFBFBD>-b+tree-ԭ<EFBFBD><EFBFBD>)
|
||||
* [4. 1 B-Tree](#4-1-b-tree)
|
||||
* [4.2 B+Tree](#42-b+tree)
|
||||
* [4.3 ?????????????? B+Tree](#43-??????????????-b+tree)
|
||||
* [4.4 ?????? B-Tree ?? B+Tree](#44-??????-b-tree-??-b+tree)
|
||||
* [??????????](#??????????)
|
||||
* [4.3 <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> B+Tree](#43-<2D><><EFBFBD><EFBFBD>˳<EFBFBD><CBB3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD>-b+tree)
|
||||
* [4.4 Ϊʲôʹ<EFBFBD><EFBFBD> B-Tree <EFBFBD><EFBFBD> B+Tree](#44-Ϊʲôʹ<EFBFBD><EFBFBD>-b-tree-<EFBFBD><EFBFBD>-b+tree)
|
||||
* [<EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD>](#<23><>ѯ<EFBFBD><D1AF><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD>)
|
||||
* [1. Explain](#1-explain)
|
||||
* [2. ??????????](#2-??????????)
|
||||
* [3. ??????????](#3-??????????)
|
||||
* [4. ????? DELETE ?? INSERT ???](#4-?????-delete-??-insert-???)
|
||||
* [???????](#???????)
|
||||
* [?????????????](#?????????????)
|
||||
* [1. ???????](#1-???????)
|
||||
* [2. ??????](#2-??????)
|
||||
* [?<3F><>?????](#?<3F><>?????)
|
||||
* [2. <EFBFBD><EFBFBD><EFBFBD>ٷ<EFBFBD><EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD>](#2-<2D><><EFBFBD>ٷ<EFBFBD><D9B7>ص<EFBFBD><D8B5><EFBFBD>)
|
||||
* [3. <EFBFBD><EFBFBD><EFBFBD>ٷ<EFBFBD><EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD>](#3-<2D><><EFBFBD>ٷ<EFBFBD><D9B7>ص<EFBFBD><D8B5><EFBFBD>)
|
||||
* [4. <EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD> DELETE <EFBFBD><EFBFBD> INSERT <EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#4-<EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD>-delete-<EFBFBD><EFBFBD>-insert-<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||||
* [<EFBFBD>ֿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD>](#<23>ֿ<EFBFBD><D6BF><EFBFBD><EFBFBD>ֱ<EFBFBD>)
|
||||
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD>ƺ<EFBFBD><EFBFBD>ϻָ<EFBFBD>](#<23><><EFBFBD><EFBFBD>ת<EFBFBD>ƺ<C6BA><CDB9>ϻָ<CFBB>)
|
||||
* [1. <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>](#1-<2D><><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>)
|
||||
* [2. <EFBFBD><EFBFBD><EFBFBD>ϻָ<EFBFBD>](#2-<EFBFBD><EFBFBD><EFBFBD>ϻָ<EFBFBD>)
|
||||
* [<EFBFBD>ο<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<23>ο<EFBFBD><CEBF><EFBFBD><EFBFBD><EFBFBD>)
|
||||
<!-- GFM-TOC -->
|
||||
|
||||
# ?<3F><>????
|
||||
# <EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
## 1. InnoDB
|
||||
|
||||
InnoDB ?? MySQL ??????????????<3F><>???????? InnoDB ??????????????????????????<3F><>???<EFBFBD><EFBFBD>
|
||||
InnoDB <EFBFBD><EFBFBD> MySQL <EFBFBD><EFBFBD>Ĭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>棬ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ InnoDB <20><>֧<EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD>ſ<EFBFBD><C5BF><EFBFBD>ʹ<EFBFBD><CAB9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD>档
|
||||
|
||||
???? MVCC ?????????????????????????????????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> MVCC <EFBFBD><EFBFBD>֧<EFBFBD>ָ߲<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD>뼶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĭ<EFBFBD>ϼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿ<EFBFBD><EFBFBD>ظ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
?????????????????????????????????????<3F><>?????????
|
||||
<EFBFBD><EFBFBD><EFBFBD>ǻ<EFBFBD><EFBFBD>ھ۴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ģ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>кܸߵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
????????????????????????????????????????????????????????<3F><>??? hash ??????????????????????????????????????????????????????????
|
||||
<EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˺ܶ<EFBFBD><EFBFBD>Ż<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӵ<EFBFBD><EFBFBD>̶<EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>õĿ<EFBFBD>Ԥ<EFBFBD><EFBFBD><EFBFBD>Զ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܹ<EFBFBD><EFBFBD>Զ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD> hash <20><><EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><D4BC>ٶ<EFBFBD><D9B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6>ϣ<EFBFBD><CFA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><D4BC>ܹ<EFBFBD><DCB9><EFBFBD><EFBFBD>ٲ<EFBFBD><D9B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD><C4B2>뻺<EFBFBD><EBBBBA><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>
|
||||
|
||||
????<3F><>???????????????????????
|
||||
ͨ<EFBFBD><EFBFBD>һЩ<EFBFBD><EFBFBD><EFBFBD>ƺ<EFBFBD><EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȱ<EFBFBD><EFBFBD>ݡ<EFBFBD>
|
||||
|
||||
## 2. MyISAM
|
||||
|
||||
MyISAM ??????????????????????????????????<3F><>????GIS??????? MyISAM ???????????<3F><>?????????????????????????
|
||||
MyISAM <EFBFBD>ṩ<EFBFBD>˴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ռ亯<EFBFBD><EFBFBD><EFBFBD><EFBFBD>GIS<EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD> MyISAM <20><>֧<EFBFBD><D6A7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>м<EFBFBD><D0BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ұ<EFBFBD><D2B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><DEB7><EFBFBD>ȫ<EFBFBD>ָ<EFBFBD><D6B8><EFBFBD>
|
||||
|
||||
????????????????????????<3F><>?
|
||||
ֻ<EFBFBD>ܶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ű<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>С<EFBFBD>
|
||||
|
||||
????????????????<3F><>??????????????????????????????????????????????<3F><>????????????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Զ<EFBFBD>ִ<EFBFBD>м<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>Լ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܵ<EFBFBD><EFBFBD><EFBFBD>һЩ<EFBFBD><EFBFBD><EFBFBD>ݶ<EFBFBD>ʧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿdz<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ġ<EFBFBD>
|
||||
|
||||
???????????????????<3F><>?
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD>߾<EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD>С<EFBFBD>
|
||||
|
||||
???????? DELAY_KEY_WRITE ??????????????????????????????????????????<3F><>???????????<3F><>??????<3F><>??????????????????????????????????????????????????<3F><>????????????????????????<3F><>?????????????????????????????????????????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> DELAY_KEY_WRITE ѡ<EFBFBD><EFBFBD><EFBFBD>ÿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̣<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǻ<EFBFBD>д<EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD>еļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߹رձ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>ŻὫ<EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̡<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫִ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
??????????????????????????????????????????????????????? MyISAM ?????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ժ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD>ʺϲ<EFBFBD><EFBFBD><EFBFBD> MyISAM ѹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
???????????????????<3F><>?????????????????????????????????? MyISAM??
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>߱<EFBFBD><EFBFBD>Ƚ<EFBFBD>С<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> MyISAM<EFBFBD><EFBFBD>
|
||||
|
||||
MyISAM ?????????????????<3F><>?????????<3F><>???????????<3F><>?
|
||||
MyISAM <EFBFBD><EFBFBD><EFBFBD>Ƽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Խ<EFBFBD><EFBFBD>ܸ<EFBFBD>ʽ<EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ijЩ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܺܺá<EFBFBD>
|
||||
|
||||
## 3. InnoDB ?? MyISAM ????
|
||||
## 3. InnoDB <EFBFBD><EFBFBD> MyISAM <EFBFBD>ıȽ<EFBFBD>
|
||||
|
||||
**????**
|
||||
**<EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
|
||||
|
||||
InnoDB ??????????
|
||||
InnoDB <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͵ġ<EFBFBD>
|
||||
|
||||
**????**
|
||||
**<EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
|
||||
|
||||
InnoDB ?????????????
|
||||
InnoDB ֧<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȱ<EFBFBD><EFBFBD>ݡ<EFBFBD>
|
||||
|
||||
**???????**
|
||||
**<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>**
|
||||
|
||||
MyISAM ??????????????? InnoDB ??????????????????????
|
||||
MyISAM <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD>ʱ<EFBFBD> InnoDB <20>ߺܶ࣬<DCB6><E0A3AC><EFBFBD>һָ<D2BB><D6B8><EFBFBD><EFBFBD>ٶ<EFBFBD>Ҳ<EFBFBD><D2B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
**????**
|
||||
**<EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
|
||||
|
||||
MyISAM ??????????? InnoDB ??????<3F><>?????
|
||||
MyISAM ֻ֧<EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> InnoDB <20><>֧<EFBFBD><D6A7><EFBFBD>м<EFBFBD><D0BC><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
**????????**
|
||||
**<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
|
||||
|
||||
MyISAM ????????????????????????
|
||||
MyISAM ֧<EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
# ????????
|
||||
# <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
## 1. ????
|
||||
## 1. <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT ?????? 8, 16, 24, 64 <EFBFBD><EFBFBD>?<3F><>????????????<3F><>??????<3F><>?
|
||||
TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT <EFBFBD>ֱ<EFBFBD>ʹ<EFBFBD><EFBFBD> 8, 16, 24, 64 λ<EFBFBD>洢<EFBFBD>ռ䣬һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԽС<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Խ<EFBFBD>á<EFBFBD>
|
||||
|
||||
INT(11) ?<3F><>????????<3F><>??????????????????????????<3F><>???????????????????
|
||||
INT(11) <EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD>ǹ涨<EFBFBD>˽<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD>ַ<EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ洢<EFBFBD>ͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ġ<EFBFBD>
|
||||
|
||||
## 2. ??????
|
||||
## 2. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
FLOAT ?? DOUBLE ??????????DECIMAL ??????<3F><>???????CPU ????????????????????? DECIMAl ??????????? DECIMAL ?????????????????????????
|
||||
FLOAT <EFBFBD><EFBFBD> DOUBLE Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD>DECIMAL Ϊ<>߾<EFBFBD><DFBE><EFBFBD>С<EFBFBD><D0A1><EFBFBD><EFBFBD><EFBFBD>͡<EFBFBD>CPU ԭ<><D4AD>֧<EFBFBD>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD>㣬<EFBFBD><E3A3AC><EFBFBD>Dz<EFBFBD>֧<EFBFBD><D6A7> DECIMAl <20><><EFBFBD>͵ļ<CDB5><C4BC>㣬<EFBFBD><E3A3AC><EFBFBD><EFBFBD> DECIMAL <20>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD>ȸ<EFBFBD><C8B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD>ߵĴ<DFB5><C4B4>ۡ<EFBFBD>
|
||||
|
||||
FLOAT??DOUBLE ?? DECIMAL ??????????<3F><>????? DECIMAL(18, 9) ?????? 18 <20><>??? 9 <20><>?<3F><><EFBFBD><EFBFBD>?????????? 9 <20><>?<3F><>?????????
|
||||
FLOAT<EFBFBD><EFBFBD>DOUBLE <EFBFBD><EFBFBD> DECIMAL <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> DECIMAL(18, 9) <EFBFBD><EFBFBD>ʾ<EFBFBD>ܹ<EFBFBD> 18 λ<EFBFBD><EFBFBD>ȡ 9 λ<>洢С<E6B4A2><D0A1><EFBFBD><EFBFBD><EFBFBD>֣<EFBFBD>ʣ<EFBFBD><CAA3> 9 λ<>洢<EFBFBD><E6B4A2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֡<EFBFBD>
|
||||
|
||||
## 3. ?????
|
||||
## 3. <EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
????? CHAR ?? VARCHAR ?????????????????????????????
|
||||
<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD> CHAR <EFBFBD><EFBFBD> VARCHAR <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ģ<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>DZ䳤<EFBFBD>ġ<EFBFBD>
|
||||
|
||||
VARCHAR ??????????????????????????<3F><>??????????????????? UPDATE ????????<3F><>??????????????????????????????<3F><>????????<3F><>?????????MyISAM ???<3F><>????????<3F>ě<EFBFBD>???? InnoDB ??????????????<3F><>??????
|
||||
VARCHAR <EFBFBD><EFBFBD><EFBFBD>ֱ䳤<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܹ<EFBFBD><EFBFBD><EFBFBD>ʡ<EFBFBD>ռ䣬<EFBFBD><EFBFBD>Ϊֻ<EFBFBD><EFBFBD>Ҫ<EFBFBD>洢<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD> UPDATE ʱ<><CAB1><EFBFBD>ܻ<EFBFBD>ʹ<EFBFBD>б<EFBFBD><D0B1>ñ<EFBFBD>ԭ<EFBFBD><D4AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>ҳ<EFBFBD><D2B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɵĴ<C9B5>Сʱ<D0A1><CAB1><EFBFBD><EFBFBD>Ҫִ<D2AA>ж<EFBFBD><D0B6><EFBFBD><EFBFBD>IJ<EFBFBD><C4B2><EFBFBD><EFBFBD><EFBFBD>MyISAM <20>Ὣ<EFBFBD>в<EFBFBD><D0B2>ɲ<EFBFBD>ͬ<EFBFBD><CDAC>Ƭ<EFBFBD>δ洢<CEB4><E6B4A2><EFBFBD><EFBFBD> InnoDB <20><><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>ҳ<EFBFBD><D2B3>ʹ<EFBFBD>зŽ<D0B7>ҳ<EFBFBD>ڡ<EFBFBD>
|
||||
|
||||
VARCHAR ??????????<3F><>????? CHAR ???????
|
||||
VARCHAR <EFBFBD>ᱣ<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ĩβ<EFBFBD>Ŀո<EFBFBD> CHAR <20><>ɾ<EFBFBD><C9BE><EFBFBD><EFBFBD>
|
||||
|
||||
## 4. ????????
|
||||
## 4. ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
MySQL ?????????????????????????DATATIME ?? TIMESTAMP??
|
||||
MySQL <EFBFBD>ṩ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD>DATATIME <EFBFBD><EFBFBD> TIMESTAMP<EFBFBD><EFBFBD>
|
||||
|
||||
**DATATIME**
|
||||
|
||||
???????? 1001 ?? 9999 ????????????????????? 8 ????<3F><>???
|
||||
<EFBFBD>ܹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1001 <EFBFBD>굽 9999 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD>ʱ<EFBFBD>䣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>룬ʹ<EFBFBD><EFBFBD> 8 <20>ֽڵĴ洢<C4B4>ռ䡣
|
||||
|
||||
???????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>ء<EFBFBD>
|
||||
|
||||
?????????MySQL ???????????????????????? DATATIME ??????<EFBFBD><EFBFBD>2008-01016 22:37:08???????? ANSI ????????????????????????
|
||||
Ĭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD>MySQL <20><>һ<EFBFBD>ֿ<EFBFBD><D6BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ġ<EFBFBD><C4A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD>ʽ<EFBFBD><CABD>ʾ DATATIME ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>硰2008-01016 22:37:08<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ANSI <20><><EFBFBD><D7BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>ʾ<EFBFBD><CABE><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
**TIMESTAMP**
|
||||
|
||||
?? UNIX ?????????????? 1970 ?? 1 ?? 1 ????????????????????????????????? 4 ????????????? 1970 ?? ?? 2038 ??
|
||||
<EFBFBD><EFBFBD> UNIX ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1970 <EFBFBD><EFBFBD> 1 <EFBFBD><EFBFBD> 1 <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>䣩<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> 4 <20><><EFBFBD>ֽڣ<D6BD>ֻ<EFBFBD>ܱ<EFBFBD>ʾ<EFBFBD><CABE> 1970 <EFBFBD><EFBFBD> <20><> 2038 <EFBFBD>ꡣ
|
||||
|
||||
????????<3F><>??
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>йء<EFBFBD>
|
||||
|
||||
MySQL ???? FROM_UNIXTIME() ?????? Unxi ??????????????????? UNIX_TIMESTAMP() ?????????????? Unix ??????
|
||||
MySQL <EFBFBD>ṩ<EFBFBD><EFBFBD> FROM_UNIXTIME() <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Unxi ʱ<><CAB1><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD>ڣ<EFBFBD><DAA3><EFBFBD><EFBFBD>ṩ<EFBFBD><E1B9A9> UNIX_TIMESTAMP() <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>Ϊ Unix ʱ<><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
??????????????????????? TIMESTAMP ?<3F><>?????????????????????
|
||||
Ĭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱû<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD> TIMESTAMP <20>е<EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD>Ὣ<EFBFBD><E1BDAB><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA>ǰʱ<C7B0>䡣
|
||||
|
||||
????????? TIMESTAMP????????? DATETIME ???<3F><>??????
|
||||
Ӧ<EFBFBD>þ<EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> TIMESTAMP<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> DATETIME <EFBFBD>ռ<EFBFBD>Ч<EFBFBD>ʸ<EFBFBD><EFBFBD>ߡ<EFBFBD>
|
||||
|
||||
# ????
|
||||
# <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
????????<3F><>?????????????????????????????????????<3F><>??????<3F><>?????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ֵģ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ֵģ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Բ<EFBFBD>ͬ<EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͺ<EFBFBD>ʵ<EFBFBD>֡<EFBFBD>
|
||||
|
||||
???????????????????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
??????<3F><>???????????????????????????????<3F><>???????<3F><>?????????????????<3F><>????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????<3F><>?????????
|
||||
<EFBFBD><EFBFBD><EFBFBD>ڷdz<EFBFBD>С<EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¼<EFBFBD>ȫ<EFBFBD><EFBFBD>ɨ<EFBFBD><EFBFBD><EFBFBD>Ƚ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD>͵ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷdz<EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ش<EFBFBD><EFBFBD>͵ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD>۽<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>õ<EFBFBD>һ<EFBFBD>ּ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֳ<EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>¼һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>¼<EFBFBD><EFBFBD>ƥ<EFBFBD>䣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
## 1. ????????
|
||||
## 1. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
### 1.1 B-Tree ????
|
||||
### 1.1 B-Tree <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
B-Tree ?????????? MySQL ?<3F><>?????????????????
|
||||
B-Tree <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> MySQL <20>洢<EFBFBD><E6B4A2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĭ<EFBFBD><C4AC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͡<EFBFBD>
|
||||
|
||||
???????????????????<3F>k?????????????????????????????????
|
||||
<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD>ɨ<EFBFBD>裬ֻ<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˲<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٶȿ<EFBFBD><EFBFBD>ܶࡣ
|
||||
|
||||
????????????????????<3F><>?????????<3F><>????????B-Tree ?????????????????????<3F><>?????????????<3F><>?????????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>й<EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD>ɼ<EFBFBD><EFBFBD><EFBFBD>B-Tree <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><C8AB>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5>Χ<EFBFBD>ͼ<EFBFBD>ǰ<C7B0><D7BA><EFBFBD>ң<EFBFBD><D2A3><EFBFBD><EFBFBD>м<EFBFBD>ǰ<C7B0><D7BA><EFBFBD><EFBFBD>ֻ<EFBFBD><D6BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<C7B0><D7BA><EFBFBD>ҡ<EFBFBD>
|
||||
|
||||
?????????????????????????????<3F><>
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD>ң<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><EFBFBD>顣
|
||||
|
||||
???????????????<3F><>??????<3F><>??????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD><EFBFBD>ң<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
### 1.2 ???????
|
||||
### 1.2 <EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
????????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD>ڹ<EFBFBD>ϣ<EFBFBD><EFBFBD>ʵ<EFBFBD>֣<EFBFBD><EFBFBD>ŵ<EFBFBD><EFBFBD>Dz<EFBFBD><EFBFBD>ҷdz<EFBFBD><EFBFBD>졣
|
||||
|
||||
?? MySQL ????? Memory ??????????????????
|
||||
<EFBFBD><EFBFBD> MySQL <EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD> Memory <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ֧<EFBFBD>ֹ<EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
InnoDB ?????????????????<3F><>????????????????????????????????????????????? B-Tree ???????????????????????????????? B-Tree ???????<3F><>?????????<3F><>??????????????????
|
||||
InnoDB <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĺ<EFBFBD><EFBFBD>ܽС<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>ʹ<EFBFBD>õķdz<EFBFBD>Ƶ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> B-Tree <20><><EFBFBD><EFBFBD>֮<EFBFBD><D6AE><EFBFBD>ٴ<EFBFBD><D9B4><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>ϣ<EFBFBD><CFA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> B-Tree <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>й<EFBFBD>ϣ<EFBFBD><CFA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һЩ<D2BB>ŵ㣬<C5B5><E3A3AC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٵĹ<D9B5>ϣ<EFBFBD><CFA3><EFBFBD>ҡ<EFBFBD>
|
||||
|
||||
?????????????????????????????????<3F><>?????????????????????<3F><>???????????<3F><>???????????????<3F><>??<3F><>???????????????????????????????????????????????????????????????????????????????<3F><>??????????????????????????<3F><>?????
|
||||
<EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϣֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>洢<EFBFBD>ֶ<EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Բ<EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>С<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD>е<EFBFBD><EFBFBD>е<EFBFBD><EFBFBD>ٶȺܿ죬<EFBFBD><EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӱ<EFBFBD>첢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ֧<EFBFBD>־<EFBFBD>ȷ<EFBFBD><EFBFBD><EFBFBD>ң<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD>ֲ<EFBFBD><EFBFBD>Һͷ<EFBFBD>Χ<EFBFBD><EFBFBD><EFBFBD>ң<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD>ͻ<EFBFBD>ܶ࣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٶȻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ú<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
### 1.3. ????????????R-Tree??
|
||||
### 1.3. <EFBFBD>ռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD>R-Tree<EFBFBD><EFBFBD>
|
||||
|
||||
MyISAM ?<3F><>??????????????????????????????<3F><>??
|
||||
MyISAM <EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD>֧<EFBFBD>ֿռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ洢<EFBFBD><EFBFBD>
|
||||
|
||||
??????????????????????????????????<3F><>?????????????????????????
|
||||
<EFBFBD>ռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ά<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ά<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϲ<EFBFBD>ѯ<EFBFBD><EFBFBD>
|
||||
|
||||
### 1.4 ???????
|
||||
### 1.4 ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
MyISAM ?<3F><>???????????????????????????<3F><>??????????????????????<3F><>????
|
||||
MyISAM <EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD>еĹؼ<EFBFBD><EFBFBD>ʣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD>ӱȽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>ֵ<EFBFBD><EFBFBD>
|
||||
|
||||
??? MATCH AGAINST????????????? WHERE??
|
||||
ʹ<EFBFBD><EFBFBD> MATCH AGAINST<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD> WHERE<EFBFBD><EFBFBD>
|
||||
|
||||
## 2. ?????????
|
||||
## 2. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD>
|
||||
|
||||
- ????????????????????????????
|
||||
- <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˷<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫɨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
- ??????????????????????????????
|
||||
- <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
- ????? I/O ?????? I/O??
|
||||
- <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> I/O <20><>Ϊ˳<CEAA><CBB3> I/O<EFBFBD><EFBFBD>
|
||||
|
||||
## 3. ???????
|
||||
## 3. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD>
|
||||
|
||||
### 3.1 ????????
|
||||
### 3.1 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
????<3F><>??????????<3F><>?????????????????????????????????????????????????
|
||||
<EFBFBD>ڽ<EFBFBD><EFBFBD>в<EFBFBD>ѯʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD>DZ<EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>֣<EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
?????????????????? actor_id ?<3F><>???????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> actor_id <20>е<EFBFBD><D0B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
```sql
|
||||
SELECT actor_id FROM sakila.actor WHERE actor_id + 1 = 5;
|
||||
```
|
||||
|
||||
### 3.2 ??????
|
||||
### 3.2 ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
???? BLOB??TEXT ?? VARCHAR ??????<3F><>??????????????????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> BLOB<EFBFBD><EFBFBD>TEXT <EFBFBD><EFBFBD> VARCHAR <EFBFBD><EFBFBD><EFBFBD>͵<EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
???????????????????? **?????????** ?????????????????????????????????????????????<3F><>???????????? 1 ???????????????<3F><>???????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>ȵ<EFBFBD>ѡȡ<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> **<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>** <20><>ȷ<EFBFBD><C8B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD><D8B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD>ͼ<EFBFBD>¼<EFBFBD><C2BC><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD>ֵ<EFBFBD><D6B5>ѡ<EFBFBD><D1A1><EFBFBD><EFBFBD>Խ<EFBFBD>ߣ<EFBFBD><DFA3><EFBFBD>ѯЧ<D1AF><D0A7>ҲԽ<D2B2>ߡ<EFBFBD><DFA1><EFBFBD><EFBFBD><EFBFBD>ֵΪ 1 <20><><EFBFBD><EFBFBD>ʱÿ<CAB1><C3BF><EFBFBD><EFBFBD>¼<EFBFBD><C2BC><EFBFBD><EFBFBD>Ψһ<CEA8><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6>
|
||||
|
||||
### 3.3 ????????
|
||||
### 3.3 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
??????????????????????<3F><>????????????????????????????????????<3F><>??????????????<3F><>????? actor_id ?? file_id ???????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫʹ<EFBFBD>ö<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD>ѯʱ<EFBFBD><EFBFBD>ʹ<EFBFBD>ö<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>ö<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܸ<EFBFBD><EFBFBD>á<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ð<EFBFBD> actor_id <EFBFBD><EFBFBD> file_id <EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
```sql
|
||||
SELECT file_id, actor_ id FROM sakila.film_actor
|
||||
WhERE actor_id = 1 OR film_id = 1;
|
||||
```
|
||||
|
||||
### 3.4 ?????<3F><>????
|
||||
### 3.4 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>˳<EFBFBD><EFBFBD>
|
||||
|
||||
?????????????????<3F><>?????<3F><>????????????????? customer_id ???????? staff_id ???????????? customer_id ?<3F><>??????????????<3F><>
|
||||
<EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>з<EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD>棬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD>Ľ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> customer_id <EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD> staff_id <EFBFBD><EFBFBD><EFBFBD>ߣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ð<EFBFBD> customer_id <20>з<EFBFBD><D0B7>ڶ<EFBFBD><DAB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD>档
|
||||
|
||||
```sql
|
||||
SELECT COUNT(DISTINCT staff_id)/COUNT(*) AS staff_id_selectivity,
|
||||
@ -235,107 +235,107 @@ customer_id_selectivity: 0.0373
|
||||
COUNT(*): 16049
|
||||
```
|
||||
|
||||
### 3.5 ???????
|
||||
### 3.5 <EFBFBD>۴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
|
||||
|
||||
????????????????????????????????????<3F><>?????
|
||||
<EFBFBD>۴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ洢<EFBFBD><EFBFBD>ʽ<EFBFBD><EFBFBD>
|
||||
|
||||
????????????????<3F><>?????????????<3F><>?????InnoDB ???????????????<3F><>???? B-Tree ???????<3F><>?
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>۴ء<EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>к<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵļ<EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD>ܵش洢<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>InnoDB <20>ľ۴<C4BE><DBB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD> B-Tree <20><>Ҷ<EFBFBD><D2B6>ҳ<EFBFBD>С<EFBFBD>
|
||||
|
||||
?????????????<3F><>???????????????????????????????????????????
|
||||
<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD>ĵط<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>۴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
**???**
|
||||
**<EFBFBD>ŵ<EFBFBD>**
|
||||
|
||||
1. ??????????????????????? I/O ??????
|
||||
2. ???????????? B-Tree ?<3F><>??????????????
|
||||
1. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>𣬼<EFBFBD><EFBFBD><EFBFBD> I/O <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
2. <EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ݱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> B-Tree <20>У<EFBFBD><D0A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݷ<EFBFBD><DDB7>ʸ<EFBFBD><CAB8>졣
|
||||
|
||||
**???**
|
||||
**ȱ<EFBFBD><EFBFBD>**
|
||||
|
||||
1. ?????????????????? I/O ??????????????????????????????????<3F><>????????????????
|
||||
2. ???????????????????????????????????????????
|
||||
3. ????????????????????????????<3F><>???????????<3F><>?<3F><>?
|
||||
4. ?????????????????<3F><>??<3F><>????????????????????????????<3F><>????????<3F><>?????????????
|
||||
5. ????<3F><>????<3F>k????????????????????<3F><>?????????????????????????????????????
|
||||
1. <EFBFBD>۴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> I/O <20>ܼ<EFBFBD><DCBC><EFBFBD>Ӧ<EFBFBD>õ<EFBFBD><C3B5><EFBFBD><EFBFBD>ܣ<EFBFBD><DCA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><C8AB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ棬<DAB4><E6A3AC>û<EFBFBD><C3BB>Ҫ<EFBFBD>þ۴<C3BE><DBB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
2. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ġ<EFBFBD>
|
||||
3. <EFBFBD><EFBFBD><EFBFBD>²<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ۺܸߣ<EFBFBD><EFBFBD><EFBFBD>Ϊÿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>µ<EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>µ<EFBFBD>λ<EFBFBD>á<EFBFBD>
|
||||
4. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>뵽ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҳ<EFBFBD>У<EFBFBD><EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ὣ<EFBFBD><EFBFBD>ҳ<EFBFBD><EFBFBD><EFBFBD>ѳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɸ<EFBFBD><EFBFBD>У<EFBFBD>ҳ<EFBFBD><EFBFBD><EFBFBD>ѻᵼ<EFBFBD>±<EFBFBD>ռ<EFBFBD>ø<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD>̿ռ䡣
|
||||
5. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>бȽ<EFBFBD>ϡ<EFBFBD>裬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҳ<EFBFBD><EFBFBD><EFBFBD>ѵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>۴<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܵ<EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD>ɨ<EFBFBD><EFBFBD><EFBFBD>ٶȱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
### 3.6 ????????
|
||||
### 3.6 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
??????????????????????<3F><>????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD>ֶε<EFBFBD>ֵ<EFBFBD><EFBFBD>
|
||||
|
||||
## 4. B-Tree ?? B+Tree ???
|
||||
## 4. B-Tree <EFBFBD><EFBFBD> B+Tree ԭ<EFBFBD><EFBFBD>
|
||||
|
||||
### 4. 1 B-Tree
|
||||
|
||||
|
||||
|
||||
??????? B-Tree??????????????????????????? [key, data]??key ?????????data ????????? key ????????
|
||||
Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> B-Tree<65><65><EFBFBD><EFBFBD><EFBFBD>ȶ<EFBFBD><C8B6><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>ݼ<EFBFBD>¼Ϊһ<CEAA><D2BB><EFBFBD><EFBFBD>Ԫ<EFBFBD><D4AA> [key, data]<EFBFBD><EFBFBD>key Ϊ<EFBFBD><EFBFBD>¼<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>data Ϊ<><CEAA><EFBFBD>ݼ<EFBFBD>¼<EFBFBD><C2BC> key <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD>
|
||||
|
||||
B-Tree ???????????????????????
|
||||
B-Tree <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݽṹ<EFBFBD><EFBFBD>
|
||||
|
||||
- ?????????????????????????? B-Tree ???????
|
||||
- ???????<3F><>? key ????????????<3F><>?
|
||||
- ?????????????????? key ????? key<sub>i</sub> ?? key<sub>i+1</sub>?????? null?????????????????? key ???? key<sub>i</sub> ??<3F><>?? key<sub>i+1</sub>??
|
||||
- <EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҷ<EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȣ<EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵ B-Tree <20><>ƽ<EFBFBD><C6BD><EFBFBD>ģ<EFBFBD>
|
||||
- һ<EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD>е<EFBFBD> key <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҷǵݼ<C7B5><DDBC><EFBFBD><EFBFBD>У<EFBFBD>
|
||||
- <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> key <20>ֱ<EFBFBD><D6B1><EFBFBD> key<sub>i</sub> <EFBFBD><EFBFBD> key<sub>i+1</sub><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD>Ϊ null<6C><6C><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>ָ<EFBFBD><D6B8><EFBFBD>ڵ<EFBFBD><DAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> key <EFBFBD><EFBFBD><EFBFBD><EFBFBD> key<sub>i</sub> <EFBFBD><EFBFBD>С<EFBFBD><EFBFBD> key<sub>i+1</sub><EFBFBD><EFBFBD>
|
||||
|
||||
?? B-Tree ?<3F><>? key ?????????????????????????????<3F><>?????????????????????? data????????????????????????????<3F><>????????????????? null ????????????????????????
|
||||
<EFBFBD><EFBFBD> B-Tree <EFBFBD>а<EFBFBD> key <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݵ<EFBFBD><EFBFBD>㷨<EFBFBD>dz<EFBFBD>ֱ<EFBFBD>ۣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȴӸ<EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD>ֲ<EFBFBD><EFBFBD>ң<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҵ<EFBFBD><EFBFBD>ض<EFBFBD>Ӧ<EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD> data<74><61><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>ָ<EFBFBD><D6B8><EFBFBD>Ľڵ<C4BD><DAB5>ݹ<EFBFBD><DDB9><EFBFBD><EFBFBD>в<EFBFBD><D0B2>ң<EFBFBD>ֱ<EFBFBD><D6B1><EFBFBD>ҵ<EFBFBD><D2B5>ڵ<EFBFBD><DAB5><EFBFBD><EFBFBD>ҵ<EFBFBD> null ָ<>룬ǰ<EBA3AC>߲<EFBFBD><DFB2>ҳɹ<D2B3><C9B9><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߲<EFBFBD><DFB2><EFBFBD>ʧ<EFBFBD>ܡ<EFBFBD>
|
||||
|
||||
???????????????????????? B-Tree ????????????????????????????????????????????????????????? B-Tree ?????
|
||||
<EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD>ɾ<EFBFBD><EFBFBD><EFBFBD>µ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݼ<EFBFBD>¼<EFBFBD><EFBFBD><EFBFBD>ƻ<EFBFBD> B-Tree <20><><EFBFBD><EFBFBD><EFBFBD>ʣ<EFBFBD><CAA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><DAB2><EFBFBD>ɾ<EFBFBD><C9BE>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><D1A1>ϲ<EFBFBD><CFB2><EFBFBD>ת<EFBFBD>ƵȲ<C6B5><C8B2><EFBFBD><EFBFBD>Ա<EFBFBD><D4B1><EFBFBD> B-Tree <EFBFBD><EFBFBD><EFBFBD>ʡ<EFBFBD>
|
||||
|
||||
### 4.2 B+Tree
|
||||
|
||||
|
||||
|
||||
?? B-Tree ????B+Tree ??????????
|
||||
<EFBFBD><EFBFBD> B-Tree <EFBFBD><EFBFBD><EFBFBD>ȣ<EFBFBD>B+Tree <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>²<EFBFBD>ͬ<EFBFBD>㣺
|
||||
|
||||
- ??????????????? 2d ?????? 2d+1??
|
||||
- ?????<3F><> data????<3F><> key????????<3F><>???
|
||||
- ÿ<EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ 2d <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 2d+1<EFBFBD><EFBFBD>
|
||||
- <EFBFBD>ڽڵ㲻<EFBFBD>洢 data<74><61>ֻ<EFBFBD>洢 key<65><79>Ҷ<EFBFBD>ӽڵ㲻<DAB5>洢ָ<E6B4A2>롣
|
||||
|
||||
### 4.3 ?????????????? B+Tree
|
||||
### 4.3 <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> B+Tree
|
||||
|
||||
|
||||
|
||||
????????????????????????? B+Tree ????????? B+Tree ????????????????????????????????????????????????????????????????????????
|
||||
һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD>ʹ<EFBFBD>õ<EFBFBD> B+Tree <20>ṹ<EFBFBD><E1B9B9><EFBFBD>ھ<EFBFBD><DABE><EFBFBD> B+Tree <20><><EFBFBD><EFBFBD><EFBFBD>Ͻ<EFBFBD><CFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD><C5BB><EFBFBD><EFBFBD><EFBFBD>Ҷ<EFBFBD>ӽڵ<D3BD><DAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><CBB3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD><EBA3AC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD><C5BB><EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD>ܡ<EFBFBD>
|
||||
|
||||
### 4.4 ?????? B-Tree ?? B+Tree
|
||||
### 4.4 Ϊʲôʹ<EFBFBD><EFBFBD> B-Tree <EFBFBD><EFBFBD> B+Tree
|
||||
|
||||
?????????????????????????????????????????????????????? B-/+Tree ???????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݽṹҲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD>ϵͳ<EFBFBD>ձ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> B-/+Tree <20><>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD>ṹ<EFBFBD><E1B9B9>
|
||||
|
||||
???????????<3F><>????????<3F><>?????????????????????????<3F><>?????????????<3F><>????<3F><>????<3F><>???????????????????<3F><>?????<3F><>???? 4k??????????????????<3F><>?????????
|
||||
ҳ<EFBFBD>Ǽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>飬Ӳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD>̴洢<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD>С<EFBFBD><EFBFBD><EFBFBD>ȵĿ飬ÿ<EFBFBD><EFBFBD><EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊһҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD>У<EFBFBD>ҳ<EFBFBD>ô<EFBFBD>Сͨ<EFBFBD><EFBFBD>Ϊ 4k<34><6B><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><CDB4><EFBFBD><EFBFBD><EFBFBD>ҳΪ<D2B3><CEAA>λ<EFBFBD><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD>
|
||||
|
||||
?????????????????????????????<3F><>??????<3F><>???????????????????????????<3F><>????????????????? I/O?????????????????????????????<3F><>?????????????????????????????????????????????????????????????????<3F><>?????????????????????<3F><>????????????????????????????????????????????<3F><>?????????????????????????????? I/O ????????????B-Tree ????<3F><>????????? h-1 ?? I/O??????????<3F><>???????????? O(h)=O(logdN)????????????<3F><>????? d ??????????????????? 100????? h ???<3F><>??????????? 3??????????????????h ????????????????????????????????????????????????????????<3F><>??????? B-Tree ????
|
||||
һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD>ܴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD>洢<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϡ<EFBFBD>Ϊ<EFBFBD>˼<EFBFBD><EFBFBD>ٴ<EFBFBD><EFBFBD><EFBFBD> I/O<><4F><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϸ<EFBFBD><CFB8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿ<EFBFBD>ζ<EFBFBD><CEB6><EFBFBD>Ԥ<EFBFBD><D4A4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǽ<EFBFBD><C7BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѧ<EFBFBD><D1A7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ľֲ<C4BE><D6B2><EFBFBD>ԭ<EFBFBD><D4AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>ݱ<EFBFBD><DDB1>õ<EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD>丽<EFBFBD><E4B8BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳͨ<D2B2><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϱ<EFBFBD>ʹ<EFBFBD>á<EFBFBD><C3A1><EFBFBD><EFBFBD>ݿ<EFBFBD>ϵͳ<CFB5><CDB3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˴<EFBFBD><CBB4><EFBFBD>Ԥ<EFBFBD><D4A4>ԭ<EFBFBD><D4AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ڵ<EFBFBD><DAB5>Ĵ<EFBFBD>С<EFBFBD><D0A1>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>ҳ<EFBFBD><D2B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿ<EFBFBD><C3BF><EFBFBD>ڵ<EFBFBD>ֻ<EFBFBD><D6BB>Ҫһ<D2AA><D2BB> I/O <20>Ϳ<EFBFBD><CDBF><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><C8AB><EFBFBD>롣B-Tree <20><>һ<EFBFBD>μ<EFBFBD><CEBC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ h-1 <EFBFBD><EFBFBD> I/O<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ㳣פ<EFBFBD>ڴ棩<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӷ<EFBFBD>Ϊ O(h)=O(logdN)<29><>һ<EFBFBD><D2BB>ʵ<EFBFBD><CAB5>Ӧ<EFBFBD><D3A6><EFBFBD>У<EFBFBD><D0A3><EFBFBD><EFBFBD><EFBFBD> d <20>Ƿdz<C7B7><C7B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֣<EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 100<30><30><EFBFBD><EFBFBD><EFBFBD><EFBFBD> h <20>dz<EFBFBD>С<EFBFBD><D0A1>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 3<><33><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽṹ<D6BD><E1B9B9>h <20><><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD>Ķࡣ<C4B6><E0A1A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><DFBC>Ϻܽ<CFBA><DCBD>Ľڵ㣨<DAB5><E3A3A8><EFBFBD>ӣ<EFBFBD><D3A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ͽ<EFBFBD><CFBF>ܺ<EFBFBD>Զ<EFBFBD><D4B6><EFBFBD><EFBFBD><DEB7><EFBFBD><EFBFBD>þֲ<C3BE><D6B2>ԣ<EFBFBD>Ч<EFBFBD><D0A7><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD> B-Tree <EFBFBD><EFBFBD><EFBFBD>ܶࡣ
|
||||
|
||||
B+Tree ????????????????????????? d ?<3F><>?????? B+Tree ????????? data ??????????<3F><>??????????<3F><>?????????
|
||||
B+Tree <EFBFBD><EFBFBD><EFBFBD>ʺ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڽڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> d <20>йء<D0B9><D8A1><EFBFBD><EFBFBD><EFBFBD> B+Tree <20>ڽڵ<DABD>ȥ<EFBFBD><C8A5><EFBFBD><EFBFBD> data <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˿<EFBFBD><CBBF><EFBFBD>ӵ<EFBFBD>и<EFBFBD><D0B8><EFBFBD><EFBFBD>ij<EFBFBD><C4B3>ȣ<EFBFBD>ӵ<EFBFBD>и<EFBFBD><D0B8>õ<EFBFBD><C3B5><EFBFBD><EFBFBD>ܡ<EFBFBD>
|
||||
|
||||
# ??????????
|
||||
# <EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD>
|
||||
|
||||
## 1. Explain
|
||||
|
||||
???????? SQL ???????????<3F><>???????????<3F><>?
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> SQL <20><><EFBFBD>䣬<EFBFBD><E4A3AC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>бȽ<D0B1><C8BD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD>ֶ<EFBFBD><D6B6>У<EFBFBD>
|
||||
|
||||
- select_type : ?????????<3F><>?????????????????
|
||||
- select_type : <EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD>м<EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϲ<EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD>ѯ
|
||||
|
||||
- key : ????????
|
||||
- key : ʹ<EFBFBD>õ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
- rows : ????????
|
||||
- rows : ɨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
## 2. ??????????
|
||||
## 2. <EFBFBD><EFBFBD><EFBFBD>ٷ<EFBFBD><EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
???????????????????????????????????????????????????????<3F><>?
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˹<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˷<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD>⣬Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>С<EFBFBD>
|
||||
|
||||
??<3F><>????? SELECT * ???????????????????<3F><>?
|
||||
<EFBFBD><EFBFBD><EFBFBD>ò<EFBFBD>Ҫʹ<EFBFBD><EFBFBD> SELECT * <EFBFBD><EFBFBD><EFBFBD>䣬Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD>С<EFBFBD>
|
||||
|
||||
## 3. ??????????
|
||||
## 3. <EFBFBD><EFBFBD><EFBFBD>ٷ<EFBFBD><EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
?????? LIMIT ???????????????<3F><>?<3F><>?
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> LIMIT <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>Щ<EFBFBD>С<EFBFBD>
|
||||
|
||||
????????????????????????????????<3F><>????????????????????????????????????????????<3F>k???????????????ݔ?<3F><>?????????? Explain ???????????? rows ????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Խ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD>ɨ<EFBFBD>衣<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>䣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD>ɨ<EFBFBD>裬<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD>Ҫɨ<EFBFBD>輸<EFBFBD>м<EFBFBD>¼<EFBFBD><EFBFBD><EFBFBD>ɣ<EFBFBD>ʹ<EFBFBD><EFBFBD> Explain <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD>۲<EFBFBD> rows <20>ֶ<EFBFBD><D6B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֲ<EFBFBD><D6B2>졣
|
||||
|
||||
```sql
|
||||
SELECT * FROM sakila.film_actor WHERE film_id = 1;
|
||||
```
|
||||
|
||||
## 4. ????? DELETE ?? INSERT ???
|
||||
## 4. <EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD> DELETE <EFBFBD><EFBFBD> INSERT <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
??????????<3F><>???????????????????????????????????????????????????????<3F><>????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>еĻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ס<EFBFBD>ܶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD>ռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־<EFBFBD><EFBFBD><EFBFBD>ľ<EFBFBD>ϵͳ<EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܶ<EFBFBD>С<EFBFBD>ĵ<EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>IJ<EFBFBD>ѯ<EFBFBD><EFBFBD>
|
||||
|
||||
```sql
|
||||
DELEFT FROM messages WHERE create < DATE_SUB(NOW(), INTERVAL 3 MONTH);
|
||||
@ -348,74 +348,74 @@ do {
|
||||
} while rows_affected > 0
|
||||
```
|
||||
|
||||
# ???????
|
||||
# <EFBFBD>ֿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD>
|
||||
|
||||
**1. ????????????**
|
||||
**1. <EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD>ͬ**
|
||||
|
||||
????????????????<3F><>????<3F><><EFBFBD><EFBFBD>????<3F><>???????????????????????????????????<3F><>??<3F><>???????<3F><>??????????????????<3F><>???????????????????<3F><>????????????
|
||||
<EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǽ<EFBFBD>һ<EFBFBD>ű<EFBFBD><EFBFBD>ֳɶ<EFBFBD><EFBFBD><EFBFBD>С<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ЩС<EFBFBD><EFBFBD>ӵ<EFBFBD>в<EFBFBD>ͬ<EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǽ<EFBFBD>һ<EFBFBD>ű<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݷ<EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>飬<EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Դ洢<EFBFBD><EFBFBD>ͬһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD>Դ洢<EFBFBD>ڲ<EFBFBD>ͬ<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD>ʽ<EFBFBD>±<EFBFBD><EFBFBD><EFBFBD>Ȼֻ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
**2. ??<3F><>??????????**
|
||||
**2. ʹ<EFBFBD>÷ֿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD>**
|
||||
|
||||
??????????????????????<3F><>???????????????<3F><>?????????????????????<3F><>????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҵ<EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD>չ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD><EFBFBD>еı<EFBFBD><EFBFBD><EFBFBD>Խ<EFBFBD><EFBFBD>Խ<EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD>ұ<EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD>Խ<EFBFBD><EFBFBD>Խ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
**3. ????<3F><>?**
|
||||
**3. <EFBFBD><EFBFBD>ֱ<EFBFBD>з<EFBFBD>**
|
||||
|
||||
??????????<3F><>??????<3F><>?????????????????????????<3F><>??????????????? payDB?????????? userDB ???????????<3F><>?????????<3F><>??????????<3F><>???
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ģ<EFBFBD>顢<EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD><EFBFBD>г̶Ȼ<EFBFBD><EFBFBD>ֳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD>Ŀ<EFBFBD><EFBFBD>ϡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>磬<EFBFBD><EFBFBD><EFBFBD>ǻὨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ʒ<EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD> payDB<44><42><EFBFBD>û<EFBFBD><C3BB><EFBFBD><EFBFBD>ݿ<EFBFBD> userDB <20>ȣ<EFBFBD><C8A3>ֱ<EFBFBD><D6B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>洢<EFBFBD><E6B4A2>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD>Ʒ<EFBFBD>йصı<D8B5><C4B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><C3BB>йصı<D8B5><C4B1><EFBFBD>
|
||||
|
||||
**4. ???<3F><>?**
|
||||
**4. ˮƽ<EFBFBD>з<EFBFBD>**
|
||||
|
||||
????<3F><>??????????????<3F><>??????????????<3F><>????<3F><> id ??????????????<3F><>????
|
||||
<EFBFBD>ѱ<EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݰ<EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD>ֹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ṹ<EFBFBD><EFBFBD>ͬ<EFBFBD>ı<EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD>簴 id <20><>ɢ<EFBFBD><C9A2>ֵ<EFBFBD><D6B5><EFBFBD>Ա<EFBFBD><D4B1>Ƚ<EFBFBD><C8BD>л<EFBFBD><D0BB>֣<EFBFBD>
|
||||
|
||||
**5. ????<3F><>??????<3F><>?????**
|
||||
**5. <EFBFBD><EFBFBD>ֱ<EFBFBD>з<EFBFBD><EFBFBD><EFBFBD>ˮƽ<EFBFBD>зֵ<EFBFBD>ѡ<EFBFBD><EFBFBD>**
|
||||
|
||||
?????????<3F><>???????????????????????????????????<3F><>????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD><EFBFBD>еı<EFBFBD>̫<EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD>ֱ<EFBFBD>з<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD>
|
||||
|
||||
??????????????????????????????????????<3F><>??
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD>ǵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܴ<EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD>ˮƽ<EFBFBD>з֡<EFBFBD>
|
||||
|
||||
**6. ???<3F><>???????**
|
||||
**6. ˮƽ<EFBFBD>зֵ<EFBFBD>ʵ<EFBFBD>ַ<EFBFBD>ʽ**
|
||||
|
||||
????????? merge ?<3F><>???<EFBFBD><EFBFBD>
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> merge <EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD>档
|
||||
|
||||
**7. ???????????????**
|
||||
**7. <EFBFBD>ֿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
|
||||
|
||||
(1) ????????
|
||||
(1) <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
????<3F><>???????????????<3F><>??????????????????????????????????????????????????????????????????????????????????????????????<3F><>????<3F><>????????<3F><>???????????????????????????????
|
||||
<EFBFBD><EFBFBD>ִ<EFBFBD>зֿ<EFBFBD><EFBFBD>ֱ<EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ洢<EFBFBD><EFBFBD><EFBFBD>˲<EFBFBD>ͬ<EFBFBD>Ŀ<EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿⱾ<EFBFBD><EFBFBD><EFBFBD>ķֲ<EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȥִ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߰<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܴ<EFBFBD><EFBFBD>ۣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD>ó<EFBFBD><EFBFBD><EFBFBD>ȥЭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD><EFBFBD>γɳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɱ<EFBFBD><EFBFBD>̷<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
(2) ?????????????
|
||||
(2) <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
?????????????????????????????????????????????????????????????????????????????????????????????????<3F><>?????????????????????????????????????????<3F><>????????????????????<3F><>?<3F><>?????<3F><>?
|
||||
<EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD>˷ֿ<EFBFBD><EFBFBD>ֱ<EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ὣԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ժ<EFBFBD>ǿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݻ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD>Ŀ<EFBFBD><EFBFBD>ϡ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD>ڲ<EFBFBD>ͬ<EFBFBD>ֿ<EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӷֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȳ<EFBFBD>ͬ<EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD>Ҫһ<EFBFBD>β<EFBFBD>ѯ<EFBFBD><EFBFBD><EFBFBD>ܹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɵ<EFBFBD>ҵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD>β<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɡ<EFBFBD>
|
||||
|
||||
# ?????????????
|
||||
# <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD>ƺ<EFBFBD><EFBFBD>ϻָ<EFBFBD>
|
||||
|
||||
?????????????<3F><>???????????????????<3F><>???????????????????????????????????????<3F><>?????????????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֹ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⣬ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>⡣<EFBFBD><EFBFBD><EFBFBD>ϻָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǵӹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>лָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ұ<EFBFBD>֤<EFBFBD><EFBFBD><EFBFBD>ݵ<EFBFBD><EFBFBD><EFBFBD>ȷ<EFBFBD>ԡ<EFBFBD>
|
||||
|
||||
## 1. ???????
|
||||
## 1. <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>
|
||||
|
||||
**1.1 ??????????<3F><>????**
|
||||
**1.1 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>ɫ**
|
||||
|
||||
??????????????????????????-????????<3F><>?????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ̨<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>⣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>ƽṹ<C6BD>е<EFBFBD><D0B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͱ<EFBFBD><CDB1><EFBFBD><EFBFBD><EFBFBD>ɫ<EFBFBD><C9AB>
|
||||
|
||||
**1.2 ???? IP ????? IP ?<3F><>?**
|
||||
**1.2 <EFBFBD><EFBFBD><EFBFBD><EFBFBD> IP <20><>ַ<EFBFBD><D6B7> IP <20>й<EFBFBD>**
|
||||
|
||||
? MySQL ???????????? IP ??????? MySQL ????<3F><>???????? IP ??????????? MySQL ?????????
|
||||
Ϊ MySQL ʵ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> IP <20><>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD> MySQL ʵ<><CAB5>ʧЧʱ<D0A7><CAB1><EFBFBD><EFBFBD><EFBFBD>Խ<EFBFBD> IP <20><>ַת<D6B7>Ƶ<EFBFBD><C6B5><EFBFBD>һ̨ MySQL <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϡ<EFBFBD>
|
||||
|
||||
**1.3 ?<3F><>?????????**
|
||||
**1.3 <EFBFBD>м<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
|
||||
|
||||
???????????<3F><>????????????????????????
|
||||
ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>·<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>õķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϡ<EFBFBD>
|
||||
|
||||
|
||||
|
||||
**1.4 ??????<3F><>?????????**
|
||||
**1.4 <EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>**
|
||||
|
||||
??????????????????<3F><>???????????????????
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD>п<EFBFBD><EFBFBD>ܵ<EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD>ñ<EFBFBD><EFBFBD><EFBFBD>̫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
## 2. ??????
|
||||
## 2. <EFBFBD><EFBFBD><EFBFBD>ϻָ<EFBFBD>
|
||||
|
||||
|
||||
# ?<3F><>?????
|
||||
# <EFBFBD>ο<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
- ?????? MySQL
|
||||
- [MySQL ????????????????????? ](http://blog.codinglabs.org/articles/theory-of-mysql-index.html)
|
||||
- [MySQL ???????????? ](http://www.runoob.com/w3cnote/mysql-index.html)
|
||||
- [20+ ?? MySQL ??????????????? ](https://www.jfox.info/20-tiao-mysql-xing-nen-you-hua-de-zui-jia-jing-yan.html)
|
||||
- <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> MySQL
|
||||
- [MySQL <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݽṹ<EFBFBD><EFBFBD><EFBFBD>㷨ԭ<EFBFBD><EFBFBD> ](http://blog.codinglabs.org/articles/theory-of-mysql-index.html)
|
||||
- [MySQL <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> ](http://www.runoob.com/w3cnote/mysql-index.html)
|
||||
- [20+ <EFBFBD><EFBFBD> MySQL <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD><EFBFBD><EFBFBD> ](https://www.jfox.info/20-tiao-mysql-xing-nen-you-hua-de-zui-jia-jing-yan.html)
|
||||
|
||||
Reference in New Issue
Block a user