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慢查询参数

slow log 输出示例

# Time: 2024-08-08T22:39:12.804253+08:00    #查询结束时间戳

# User@Host: root[root] @ localhost []  Id:    83

# Query_time: 2.331306  Lock_time: 0.000003 Rows_sent: 9762500  Rows_examined: 6250   

SET timestamp=1723127950;

select * from huge_table a,huge_table b where  a.id<>b.id;

测试slow log记录时间戳

[root@localhost] [test]> select now();
+---------------------+
| now()               |
+---------------------+
| 2024-08-11 17:17:45 |
+---------------------+
1 row in set (0.00 sec)[root@localhost] [test]> select sleep(5);+----------+
| sleep(5) |
+----------+
|        0 |
+----------+
1 row in set (5.01 sec)[root@localhost] [test]> select now();
+---------------------+
| now()               |
+---------------------+
| 2024-08-11 17:17:50 |
+---------------------+
1 row in set (0.00 sec)===# Time: 2024-08-11T17:17:50.183134+08:00          #查询结束时间
# User@Host: root[root] @ localhost []  Id:  3732
# Query_time: 5.000437  Lock_time: 0.000000 Rows_sent: 1  Rows_examined: 1   #查询时间
SET timestamp=1723367865;
select sleep(5);