How to solve the problem of read-only mysql database

Methods to solve the read-only mode of the MySQL database: wait for the maintenance activities to end; check the system log for errors; restart the MySQL service; check and adjust the read_only variable; contact the database administrator for help.

MySQL database read-only mode solution

When the MySQL database enters read-only mode, users will not be able to access the read-only mode. It performs any write operation, including inserting, updating, and deleting data. This is usually caused by maintenance activities or system failure. There are several ways to solve the read-only mode of the MySQL database:

1. Wait for the maintenance to be completed

If the database enters the read-only mode due to maintenance activities, you need to wait It will not return to normal until maintenance operations are completed. Maintenance times are usually notified in advance.

2. Check the system log

Check the database server log for any error messages regarding the cause of read-only mode. These logs may be located in files such as /var/log/mysql/error.log or /var/log/messages.

3. Restart the MySQL service

Sometimes, restarting the MySQL service can solve the read-only mode problem. To restart the service, you can use the following command:

<code>sudo service mysql restart</code>

4. Check whether the read_only variable

read_only variable controls whether the database In read-only mode. If this variable is set to ON, the database will be in read-only mode. To check this variable, use the following command:

<code>SELECT @@global.read_only;</code>

If read_only is ON, you can set it to OFF to disable read_only Read mode:

<code>SET GLOBAL read_only = OFF;</code>

5. Contact the database administrator

If the above steps do not solve the problem, you may need to contact the database administrator for help. Administrators can examine the server configuration and system logs to determine the source of the problem and resolve it.

The above is the detailed content of How to solve the problem of read-only mysql database. For more information, please follow other related articles on the PHP Chinese website!