mysql-日志管理
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);
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