MySQL状态变量 Handler_delete和Com_delete关系（转老金）
原文http://www.mysqlops.com/2011/02/10/mysql%E7%8A%B6%E6%80%81%E5%8F%98%E9%87%8F-handler_delete%E5%92%8Ccom_delete%E6%9C%89%E4%BB%80%E4%B9%88%E5%85%B3%E7%B3%BB%EF%BC%9F.html这两个都是MYSQL,SHOW STATUS里的一个状态变量.
根据MYSQL官方文档解释:
Handler_delete:
The number of times that rows have been deleted from tables.
DELETED行数.
com_delete:
The Com_xxx statement counter variables indicate the number of times each xxx statement has been executed.\
DELETE命令的执行次数.
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下面我们来测试一下:
(root@sns-ptst4:)> select * from t1;
+——+——-+
| name | n1 |
+——+——-+
| aaa | NULL |
| bbb | NULL |
| ccc | NULL |
| aaa | aaaaa |
+——+——-+
4 rows in set (0.00 sec)
(root@sns-ptst4:)> show global status like ‘%delete%’;
+———————+——-+
| Variable_name | Value |
+———————+——-+
| Com_delete | 0 |
| Com_delete_multi | 0 |
| Handler_delete | 0 |
| Innodb_rows_deleted | 0 |
+———————+——-+
4 rows in set (0.00 sec)
(root@sns-ptst4:)> delete from t1;
Query OK, 4 rows affected (0.00 sec)
(root@sns-ptst4:)> commit;
Query OK, 0 rows affected (0.00 sec)
(root@sns-ptst4:)> show global status like ‘%delete%’;
+———————+——-+
| Variable_name | Value |
+———————+——-+
| Com_delete | 1 |
| Com_delete_multi | 0 |
| Handler_delete | 4 |
| Innodb_rows_deleted | 4 |
+———————+——-+
4 rows in set (0.00 sec)
从两次SHOW STATUS的结果来看,都与官文描述是相符的.
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