mysql日志的查看与开启

mysql的日志类型：

　　错误日志： log-error
　　查询日志： log
　　慢查询日志: log-slow-queries
　　更新日志: log-update
　　二进制日志： log-bin

开启错误日志

log-error=/usr/local/mysql/log/log-error.log

开始查询日志

log=/usr/local/mysql/log/log-query.log

由于mysql版本升级，上面的参数设置会报错，要改成下面的参数设置，才能开启日志

general_log=ON
general_log_file=/usr/local/mysql/log/mysql_query.log

开启慢查询日志

log-slow-queries=/usr/local/mysql/log/log-slow-query.log

由于mysql版本升级，上面的参数设置会报错，要改成下面的参数设置，才能开启日志

slow-query-log=1 #开启为1，关闭为0
long_query_time = 2
slow-query-log-file=d:/wamp/logs/mysql_slow_query.log

开启更新日志

log-update=/usr/local/mysql/log/log-update.log

开启二进制日志

log-bin=/usr/local/mysql/log/log-bin.log

实例测试：开启查询日志、错误日志

　　1、编辑/etc/my.cnf，即编辑mysql的配置文件

vi /etc/my.cnf

　　2、添加开启查询日志、错误日志的代码段

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　 3、重启mysql数据库

4、输入命令，实时查看log-query.log文件

tail -f /usr/local/mysql/log/log-query.log

　 5、打开另一个终端，进入mysql里进行查询操作

 　　　　mysql -uroot -p123456
 
 　　　　use test
 
 　　　　select * from one;

　6、执行步骤5时，log-query.log的内容就会变动

问题：在/usr/local/mysql/log/文件夹中，有log-error.log文件，但是没有log-query.log文件。

原因：在log-error.log文件里，找到错误提示。本人理解为，没权限创建文件。但是，怎么又有权限创建log-error.log文件，真是纠结。

解决：自己创建一个log-query.log文件，并设置权限为777（有点暴力了）