How to Fix MySQL's 'The total number of locks exceeds the lock table size' Error?

MySQL Lock Table Size Configuration: Resolving "The total number of locks exceeds the lock table size" Error

When executing queries involving large amounts of row insertions in MySQL, users may encounter the error "Error code 1206: The number of locks exceeds the lock table size." This occurs when the number of locks used exceeds the limit defined in the lock table size configuration.

Cause of the Error

The primary cause of this error is an insufficient lock table size to accommodate the number of locks required for the query. Locks are essential in database systems to prevent concurrent access and data inconsistency, but when the lock table is too small, it can become overwhelmed, leading to the error message.

Resolution

The resolution for this error involves increasing the lock table size to allow for more locks. This can be accomplished by modifying the MySQL configuration file, my.cnf, typically located at /etc/my.cnf on Linux servers.

Step-by-Step Configuration

1. Locate and open the my.cnf configuration file.
2. Add the following line to the file: innodb_buffer_pool_size=64MB
3. Save and close the file.

The innodb_buffer_pool_size variable sets the size of the InnoDB buffer pool, which includes the lock table. Increasing this size will allow for more locks to be stored and reduce the likelihood of exceeding the lock table size limit.

Restarting MySQL

Once the configuration changes are made, MySQL must be restarted to apply them. This can be done using the following commands:

• service mysqld restart
• /etc/init.d/mysqld restart

After restarting MySQL, the increased lock table size should resolve the "The total number of locks exceeds the lock table size" error, allowing the query to execute successfully.

Reference

For further information, refer to the MySQL documentation on [The total number of locks exceeds the lock table size](https://dev.mysql.com/doc/refman/8.0/en/innodb-troubleshooting-deadlocks.html).

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