mysql日志

1.mysql错误日志

1.错误日志默认是关闭的
2.默认路径是 $datadir/，默认的名字是'主机名.err'
3.配置方式（一般场景所有配置）
    [root@db02 ~]# vim /etc/my.cnf
    [mysqld]
    server_id=1
    basedir=/usr/local/mysql
    datadir=/usr/local/mysql/data
    port=3306
    socket=/tmp/mysql.sock
    skip-name-resolve
    log_err=/usr/local/mysql/data/mysql.err

    [mysql]
    socket=/tmp/mysql.sock
4.查看方式
    [root@db02 ~]# mysql -e "show variables like '%log_err%'"
    +---------------------+---------------------------------+
    | Variable_name       | Value                           |
    +---------------------+---------------------------------+
    | log_error           | /usr/local/mysql/data/mysql.err |
    +---------------------+---------------------------------+

2.一般查询日志

1.查看方式
    mysql> show variables like '%general%';
    +------------------+--------------------------------+
    | Variable_name    | Value                          |
    +------------------+--------------------------------+
    | general_log      | OFF                            |
    | general_log_file | /usr/local/mysql/data/db02.log |
    +------------------+--------------------------------+
    2 rows in set (0.00 sec)
2.默认是关闭的
3.默认路径是 $datadir/，默认的名字是'主机名.log'
4.配置方式
    [root@db02 ~]# vim /etc/my.cnf

    [mysqld]
    log_err=/usr/local/mysql/data/mysql.err
    general_log=on
    general_log_file=/usr/local/mysql/data/db02.log

    [mysql]
    socket=/tmp/mysql.sock

3.二进制日志

#注意：
	1）binlog生成默认大小是120
	2）binlog的大小也是binlog的当前位置点

1.查看方式
mysql> show variables like '%log_bin%';
2.二进制日志默认是关闭的
3.配置binlog
    [root@db02 ~]# vim /etc/my.cnf
    [mysqld]
    server_id							#mysql5.7必须配置server_id
    log_bin=/usr/local/mysql/data/mysql-bin			#mysql5.7只支持下划线
	#log-bin=/usr/local/mysql/data/mysql-bin		#mysql5.6都支持
4.二进制配置路径和名字由配置文件决定，一般保存在$datadir/ 以'mysql-bin.000001'命令