mysql manual 15_log
Error log:
Check the location of the error log:
show variables like 'log_error%';
+----------------------------+----------------------------------------+
| Variable_name | Value |
+----------------------------+----------------------------------------+
| log_error | /var/log/mysqld.log |
| log_error_services | log_filter_internal; log_sink_internal |
| log_error_suppression_list | |
| log_error_verbosity | 2 |
+----------------------------+----------------------------------------+
Binlog:
All DDL (data definition language) statements and DML (data manipulation statements) are recorded, but data query statements (select) are not included, which is closed by default
MySQL's master-slave replication is based on binlog
Find the location of my.cnf configuration file:
whereis my.cnf
my: /etc/my.cnf
Configure binlog in my.cnf:
#配置开启binlog日志
log_bin=binlog
#配置二进制日志的格式
binlog_format=MIXED
二进制日志的格式:
STATEMENT： 以SQL语句的形式记录
ROW： 记录的是每一行的数据变更
MIXED： 默认日志格式，混合了以上两种格式
#配置日志过期时间为3天
--expire_logs_days=3
#修改完成需要重启mysql
service mysql restart
Binlog log file save location: /var/lib/mysql
查看STATEMENT格式的日志示例：
mysqlbinlog binlog.000001
查看ROW格式的日志示例：
mysqlbinlog -vv binlog.000001
Log clearing (logs not cleared in time will take up a lot of disk space):
方式1：清除所有的日志：
reset master
方式2：删除指定编号之前的日志：
purge master logs to 'binlog.000002'
方式3：删除‘yyyy-mm-dd hh24:mi:ss'时间点之前的日志
purge master logs before 'yyyy-mm-dd hh24:mi:ss'
Query log (including additions, deletions and changes, as well as queries):
配置开启查询日志，0为关闭，1为开启
general_log=1
配置查询日志文件名（存放位置：/var/lib/mysql）
general_log_file=mysql_query_log
#修改完成需要重启mysql
service mysql restart
Slow query log:
All SQL statements whose execution time exceeds long_query_time (default 10s) are recorded
配置开启慢查询日志，0为关闭，1为开启
slow_query_log=1
配置慢查询日志文件名（存放位置：/var/lib/mysql）
slow_query_log_file=slow_query.log
配置慢查询日志的查询时间限制
long_query_time=10
#修改完成需要重启mysql
service mysql restart
查看配置的慢查询时间限制：
show variables like 'long_query_time';