How to Detect Locked Tables in MySQL using the SHOW OPEN TABLES Command?

Detecting Locked Tables with Locked by LOCK TABLE

Unlocking a specific database table locked by the LOCK TABLE command can be a critical troubleshooting step. Fortunately, MySQL provides a straightforward mechanism for detecting locked tables.

Solution:

Utilize the SHOW OPEN TABLES command to retrieve information about currently open tables. By filtering the results based on specified criteria, you can pinpoint locked tables.

For instance, to identify locked tables in a particular database:

SHOW OPEN TABLES WHERE `Table` LIKE '%[TABLE_NAME]%' AND `Database` LIKE '[DBNAME]' AND In_use > 0;

In this command:

• [TABLE_NAME] is the name of the table in question.
• [DBNAME] is the database containing the locked table.
• In_use is a column that indicates the number of active connections using the table.

This query will return rows for any tables that meet the specified criteria, effectively allowing you to detect locked tables in the specified database.

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