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Asked: 2026-05-31T13:56:54+00:00

http://dev.mysql.com/doc/refman/5.0/en/internal-locking.html The following is the extract from the documentation. mysql> LOCK TABLES real_table WRITE,

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http://dev.mysql.com/doc/refman/5.0/en/internal-locking.html

The following is the extract from the documentation.

mysql> LOCK TABLES real_table WRITE, temp_table WRITE;
mysql> INSERT INTO real_table SELECT * FROM temp_table;
mysql> DELETE FROM temp_table;
mysql> UNLOCK TABLES;

My question is that if I use this logic in the shell script code, and if the thread is lost (not killed) before it reaches “unlock tables” statement, how will I know that some tables are locked and how do I unlock tables manually?

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  1. Editorial Team

    how will I know that some tables are locked?

    You can use SHOW OPEN TABLES command to view locked tables.

    how do I unlock tables manually?

    If you know the session ID that locked tables – ‘SELECT CONNECTION_ID()’, then you can run KILL command to terminate session and unlock tables.

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