一:Mysql 啓動/重啓:
[root@localhost ~]# service mysqld start /restart
登陸mysql:
[root@localhost ~]# Mysql -hip -uuser -ppsw
Ip—> 服務器IP user—>mysql服務器用戶名 psw—>mysql服務器密碼
二:Mysql 添加慢查詢日誌:
step0:
查看並設置 log_queries_not_using_indexes
set global log_queries_not_using_indexes=on;
step1:
查看並設置:當sql耗時多久打印慢sql
show variables like "long_query_time";
set global long_query_time=2;(單位秒,可設置小數)
step2:
查看是否開啓慢查詢日誌:
show variables like "slow_query_log";
step3:
如果上面的是off開啓慢查詢日誌
set global slow_query_log=on;
step4:
查看慢查詢日誌保存位置
show variables like "slow%”;
+---------------------+----------------------------------------+
| Variable_name | Value |
+---------------------+----------------------------------------+
| slow_launch_time | 2 |
| slow_query_log | ON |
| slow_query_log_file | /var/lib/mysql/VM_0_11_centos-slow.log |
+---------------------+----------------------------------------+