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CyC2018
2018-10-15 21:51:19 +08:00
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2 changed files with 2 additions and 2 deletions

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@ -220,7 +220,7 @@ Explain 用来分析 SELECT 查询语句,开发人员可以通过分析 Explai
一个大查询如果一次性执行的话,可能一次锁住很多数据、占满整个事务日志、耗尽系统资源、阻塞很多小的但重要的查询。
```sql
DELEFT FROM messages WHERE create < DATE_SUB(NOW(), INTERVAL 3 MONTH);
DELETE FROM messages WHERE create < DATE_SUB(NOW(), INTERVAL 3 MONTH);
```
```sql