MySQL 日志管理
/etc/my.cnf
error log 错误日志 排错 /var/log/mysqld.log[默认开启]
bin log 二进制日志 备份 增量备份 DDL DML DCL
Relay log 中继日志 复制 接收 replication master
slow log 慢查询日志 调优 查询时间超过指定值
- Error Log
- log-error=/var/log/mysqld.log
- Binary Log
- log-bin=/var/log/mysql-bin/slave2
- server-id=2
- mkdir /var/lib/mysql-bin
- #chown mysql.mysql /var/lib/mysql-bin/
- #systemctl restart mysqld
注:
重启 mysqld 会截断
flush logs 会截断
reset master 删除所有 binlog rm -rf /
删除部分
- PURGE BINARY LOGS TO 'mysql-bin.010';
- PURGE BINARY LOGS BEFORE '2016-04-02 22:46:26';
暂停 仅当前会话
- SET SQL_LOG_BIN=0;
- SET SQL_LOG_BIN=1;
截取 binlog
- all:
- mysqlbinlog mysql.000002
- datetime:
- #mysqlbinlog mysql.000002 --start-datetime="2018-12-05 10:02:56"
- #mysqlbinlog mysql.000002 --stop-datetime="2018-12-05 11:02:54"
- #mysqlbinlog mysql.000002 --start-datetime="2018-12-05 10:02:56" --stop-datetime="2018-12-05 11:02:54"
- position:
- #mysqlbinlog mysql.000002 --start-position=260
- mysqlbinlog mysql.000002 --stop-position=260
- #mysqlbinlog mysql.000002 --start-position=260 --stop-position=930
- Slow Query Log
- slow_query_log=1
- slow_query_log_file=/var/log/mysql-slow/slow.log
- long_query_time=3
- #mkdir /var/log/mysql-slow/
- #chown mysql.mysql /var/log/mysql-slow/
- #systemctl restart mysqld
查看慢查询日志
测试: BENCHMARK(count,expr)
SELECT BENCHMARK(50000000,2*3);
来源: http://www.bubuko.com/infodetail-2743386.html