show global variables和show variables得出的结果疑问
root@host01 conf]# more /db/mysqlmha/conf/my.cnfserver_id=1
log-bin=binlog
log-bin-index=binlog.index
port=3306
basedir=/db/mysqlmha
datadir=/db/mysqlmha/data
socket=/db/mysqlmha/mysql.sock
character-set-server=utf8
max_connections = 1500
show_compatibility_56=on
wait_timeout=600
配置文件里设置的wait_timeout为600
使用show global variables查出来的是600，说明这个是读取配置文件的
mysql> show global variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout| 600 |
+---------------+-------+
1 row in set (0.01 sec)
使用show variables查出来的是28800，请问这个值是从那里读取的呢？ 我也想用show variables查出的值是600，需要怎么呢？
mysql> showvariables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout| 28800 |
+---------------+-------+
1 row in set (0.00 sec) 回复 1# hxl
参考：
https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_wait_timeout
The number of seconds the server waits for activity on a noninteractive connection before closing it.
On thread startup, the session wait_timeout value is initialized from the global wait_timeout value or from the global interactive_timeout value, depending on the type of client (as defined by the CLIENT_INTERACTIVE connect option to mysql_real_connect()). See also c.
你 show variables 的时候是显示的当前的会话变量，两个不是同一个内容。具体没有深究，你试试看 interactive_timeout 这个配置调整看看。 一个global级别，一个session级别，当然不同
wait_timeout=100
interactive_timeout=100
connect_timeout = 20
slave-net-timeout=30
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