How to Solve MySQL Error 1206: 'The Total Number of Locks Exceeds the Lock Table Size'?

MySQL Error: "The Total Number of Locks Exceeds the Lock Table Size"

When encountering MySQL error 1206, indicating that the number of locks exceeds the lock table size, it's crucial to understand the underlying cause and identify suitable solutions.

This issue arises when the server attempts to lock a large number of rows simultaneously, leading to a shortage of available lock resources. In such cases, adjusting the innodb_buffer_pool_size MySQL variable can provide a temporary or permanent fix.

To troubleshoot this error, consider the following steps:

1. Increase innodb_buffer_pool_size:

The MySQL configuration file typically resides at /etc/my.cnf on Linux servers. Within this file, add or modify the following line:

innodb_buffer_pool_size=64MB

2. Restart MySQL:

Once the configuration file is updated, restart MySQL using the following commands:

service mysqld restart

/etc/init.d/mysqld restart

Additional Considerations:

• If adjusting the buffer pool size doesn't resolve the issue, it may be necessary to analyze the query that is causing the high number of locks.
• Optimizing the query to reduce the number of locked rows can alleviate the problem.
• As a temporary workaround, consider executing the queries in increments to avoid locking too many rows simultaneously.
• For a permanent fix, it's recommended to set a higher value for innodb_buffer_pool_size to increase the server's lock capacity.

By following these steps, you can effectively address the "Total number of locks exceeds the lock table size" error in MySQL.

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