Mysql5.7慢日志时间与系统时间相差8小时问题的解决

一、msyql5.7开启慢日志后发现日志的时间与系统时间相差8小时

[root@zabbix_server mysql]# vim zabbix_server-slow.log 

 17  LIMIT 0, 1000;
 18 # Time: 2020-04-07T09:16:18.175882Z
 19 # User@Host: root[root] @ zabbix_server [172.28.18.75]  Id: 5815703
 20 # Query_time: 0.105811  Lock_time: 0.000000 Rows_sent: 0  Rows_examined: 0
 21 use slow_query_log;
 22 SET timestamp=1586250978;
 23 CREATE TABLE `global_query_review` (
  1 
  2 # Time: 2020-04-07T06:34:40.688996Z
  3 # User@Host: root[root] @ zabbix_server [172.28.18.75]  Id: 5815703
  4 # Query_time: 0.293296  Lock_time: 0.000120 Rows_sent: 1  Rows_examined: 0
  5 SET timestamp=1586241280;
  6 select count(*) from history_log;
  7 # Time: 2020-04-07T06:38:39.484322Z
  8 # User@Host: root[root] @ zabbix_server [172.28.18.75]  Id: 5815703
  9 # Query_time: 91.377653  Lock_time: 0.000102 Rows_sent: 1  Rows_examined: 15267776
 10 SET timestamp=1586241519;
 11 select count(*) from trends;

Time: 2020-04-07T06:34:40.688996Z，实际时间应该是14：34:40
这是由于log_timestamps这个参数设置造成的，查询当前设置

mysql> show variables like '%log_time%';
+----------------+-------+
| Variable_name  | Value |
+----------------+-------+
| log_timestamps | UTC   |
+----------------+-------+
1 row in set (0.01 sec)

UTC是世界统一时间，而我现在的系统为北京时间是东八区，比UTC早了8个小时，所以这里设置为SYSTEM

mysql> set global log_timestamps=SYSTEM;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like '%log_time%';
+----------------+--------+
| Variable_name  | Value  |
+----------------+--------+
| log_timestamps | SYSTEM |
+----------------+--------+
1 row in set (0.01 sec)

在mysql里执行一条测试慢日志语句

mysql> select sleep(5);
+----------+
| sleep(5) |
+----------+
|        0 |
+----------+
1 row in set (4.99 sec)

mysql> 

再次查看慢日志

 51  LIMIT 0, 1000;
 52 # Time: 2020-04-08T14:25:16.200913+08:00
 53 # User@Host: root[root] @ zabbix_server [172.28.18.75]  Id: 5870204
 54 # Query_time: 5.000269  Lock_time: 0.000000 Rows_sent: 1  Rows_examined: 0
 55 use slow_query_log;
 56 SET timestamp=1586327116;
 57 select sleep(5);
[root@zabbix_server mysql]# 

时间跟系统时间一样了。