How to maintain MySQL Database Log Files

Because log files are an important reference for restoring database data, maintenance of log files is also very important. When MySQL is used together with log files, you sometimes want to delete/back up old log files and tell MySQL to start recording in new files. This article describes how to enable new log files, including updates and general logs. The method described here also applies to binary logs.

How to use the new update log

If you only use one Update log, you only need to clear the log file, then remove the old Update log file to a backup, and then enable the new update log.

Use the following methods to force the server to enable new update logs:

◆ Mysqladmin flush-logs

You generally need to provide the following database users in the command line:

Mysqladmin-u root-p flush-logs

◆ Mysqladmin refresh

You generally need to provide the following database users in the command line:

Mysqladmin-u root-p refresh

If you are using MySQL 3.21 or earlier, you must use mysqladmin refresh.

◆ SQL commands

FLUSH LOGS

◆ Restart the server

The preceding methods have the following functions:

Close and then open the standard and update record files. If you specify an update record file without an extension, the extension number of the new update record file will be 1 higher than that of the previous file.

Mysql> flush logs;

How to use new regular logs

The above method can also force update of regular logs.

To back up General logs, the steps may be complicated:

$ Cd mysql-data-directory $ mv mysql. log mysql. old $ mysqladmin flush-tables

Make a backup and delete "mysql. old ".