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在默认情况下,mysql安装是没有启用日志管理功能的,这为后续的维护带来很多不便的地方。
查看是否启用了日志
mysql>show variables like 'log_bin';
怎样知道当前的日志
mysql> show master status;
展示二进制日志数目
mysql> show master logs;
看二进制日志文件用mysqlbinlog
shell>mysqlbinlog mail-bin.000001
或者shell>mysqlbinlog mail-bin.000001 | tail
在配置文件中指定log的輸出位置.
Windows:Windows 的配置文件为 my.ini,一般在 MySQL 的安装目录下或者 c:/Windows 下。
Linux:Linux 的配置文件为 my.cnf ,一般在 /etc 下。
日志文件类型概述:
1.
错误日志 记录启动、运行或停止mysqld时出现的问题。
My.ini配置信息:
#Enter a name for the error log file. Otherwise a default name will be used.
#log-error=d:/mysql_log_err.txt
2.
查询日志 记录建立的客户端连接和执行的语句。
My.ini配置信息:
#Enter a name for the query log file. Otherwise a default name will be used.
#log=d:/mysql_log.txt
3.
更新日志 记录更改数据的语句。不赞成使用该日志。
My.ini配置信息:
#Enter a name for the update log file. Otherwise a default name will be used.
#log-update=d:/mysql_log_update.txt
4.
二进制日志 记录所有更改数据的语句。还用于复制。
My.ini配置信息:
#Enter a name for the binary log. Otherwise a default name will be used.
#log-bin=d:/mysql_log_bin
5.
慢日志 记录所有执行时间超过long_query_time秒的所有查询或不使用索引的查询。
My.ini配置信息:
#Enter a name for the slow query log file. Otherwise a default name will be used.
#long_query_time =1
#log-slow-queries= d:/mysql_log_slow.txt
linux下:
在[mysqld] 中輸入
log-error=/usr/local/mysql/log/error.log
log=/usr/local/mysql/log/mysql.log
long_query_time=2
log-slow-queries= /usr/local/mysql/log/slowquery.log
windows下:
Sql代码
在[mysqld] 中輸入
##启动日志
log="E:/wamp/MySql/mysql_log/mysql.log"
##错误日志
log-error="E:/wamp/MySql/mysql_log/mysql.logerror.log"
##是指执行超过多久的sql会被log下来,这里是2秒
long_query_time=2
##慢查询日志
log-slow-queries= "E:/wamp/MySql/mysql_log/slowquery.log"
long_query_time =2 --是指执行超过多久的sql会被log下来,这里是2秒
log-slow-queries= /usr/local/mysql/log/slowquery.log --将查询返回较慢的语句进行记录
log-queries-not-using-indexes = nouseindex.log --就是字面意思,log下来没有使用索引的query
log=mylog.log --对所有执行语句进行记录
至于准确的看懂日志文件,还需要读者仔细阅读,我也看不懂 嘿嘿
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