We’ll show you how to repair a MySQL database ane, how to optimize MySQL database and tables. We will talk about mysqlcheck which is a maintenance command line tool that allows you to check, analyze, repair, and optimize MySQL/MariaDB tables and databases. Repairing MySQL database is not complicated process, just follow the steps bellow carefully.
1. Check one table in the MySQL database
The following command will check the table posts in the database blog:
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If your database is protected by a password add
-u root -p
at the end of the command:2. Analyze all tables in a MySQL database
The following command will check the table posts in the database blog:
If the MySQL/MariaDB server is running on a remote host, add
-h
at the end of the command:3. Optimize all tables in all MySQL database
Table does not support optimize, doing recreate + analyze instead
means that we’re doing OPTIMIZE on an InnoDB table that doesn’t support this option. When doing OPTIMIZE on an InnoDB table it creates an empty table, copies all rows from the existing table into to the new one, deletes the old one and renames the new table, and then runs ANALYZE on the table.Table is already up to date
means that the table is already up to date and there is no need to check it.4. Repair multiple MySQL databases
The following command will repair all tables in both blog and blog2 databases:
If you see
note : The storage engine for the table doesn't support repair
it means that you are doing REPAIR on an InnoDB.5. Optimize and repair all tables in all MySQL databases
The following command will check all tables in all databases and if some table is corrupted it will automatically fix it that table:
6. Most used mysqlcheck arguments
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-c, --check | Check table for errors. |
-a, --analyze | Analyze given tables. |
-o --optimize | Optimize the tables. |
-r, --repair | Perform a repair that can fix almost anything except unique keys that are not unique. |
--auto-repair | If a checked table is corrupted, automatically fix it. Repairing will be done after all tables have been checked. |
-A, --all-databases | Check all the databases. This is the same as –databases with all databases selected. |
-B, --databases | Process all tables in the named databases. With this option, all name arguments are regarded as database names, not as table names. |
--tables | Overrides the –databases or -B option such that all name arguments following the option are regarded as table names. |
-g, --check-upgrade | Check tables for version-dependent changes. May be used with –auto-repair to correct tables requiring version-dependent updates. |
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