How to repair MySQL tables

    October 9, 2019

    How Nexcess clients on physical (non-cloud) accounts can repair crashed MySQL tables using either phpMyAdmin or the MySQL CLI.

    If you encounter MySQL time-out errors or unexpected restarts, the likely cause is one or more crashed database tables. Repairing the crashed tables will likely solve the issue, though this may cause the loss of some data. 

    If you are uncomfortable with losing data, then using a recent database dump to restore the database may mitigate this loss. However, if the date of your last database dump is not recent, it can result in greater data loss than simply repairing the table.

    Attention

    This method only applies to Nexcess clients on physical (non-cloud) servers. If you are a Nexcess Cloud client, contact our 24/7 support team for assistance.

    Repairing crashed tables with phpMyAdmin

    You can access phpMyAdmin from your SiteWorx account:  

    1. Log in to your SiteWorx account.

    2. On the left, select Hosting Features > MySQL > PhpMyAdmin.

    3. Select the correct database from the list on the left.

    4. Select the check box corresponding to the corrupted table, and from the With selected list, click Repair table.

    Repairing crashed tables with the MySQL CLI

    Use this procedure to repair MySQL tables from the command line:

    1. Log in to the server using SSH.

    2. From the command line, enter this command, replacing [username] with your username and without the brackets:
      mysql -u [username] -p

    3. Enter your password.
    4. Again, without the brackets, enter the command:
      use [databasename];
    5. Enter the command:
      show tables;

    6. Unlike phpMyAdmin, there is no way to repair multiple tables with one command. Instead, you must issue one command per table:
      1. To check a table for errors, enter:
        check table [yourtablename];
      2. To repair a table, enter:
        repair table [yourtablename];
    7. Type quit to return to the command prompt.

    External resources

    For the complete MySQL documentation, see the MySQL development website.


    For 24-hour assistance any day of the year, contact our support team by email or through your Client Portal.

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