Why Does My MySQL Prepared Statement Need Re-preparing After Server Migration?

Understanding the "Prepared Statement Needs to Be Re-prepared" MySQL Error

When migrating code involving MySQL Stored Procedures from a local environment to a hosting server, users may encounter a persistent fatal error stating that a prepared statement needs to be re-prepared. This intermittent issue can result in pages failing to load.

Cause:

The error is likely related to the MySQL bug #42041, which involves statement caching and table definition caching.

Solution:

To address this bug, it is recommended to increase the value of the table_definition_cache parameter. This parameter controls the number of table definitions that are cached, optimizing performance for queries.

Implementation:

To modify the table_definition_cache setting, follow these steps:

1. Connect to the MySQL database server as an administrator.
2. Execute the following query:

SET GLOBAL table_definition_cache=<new_value>;</new_value>

Replace with an appropriate value. A value of 1024 or higher is recommended for large databases.

3. Restart the MySQL service to apply the changes.

Additional Information:

More detailed information about statement caching in MySQL can be found in the official documentation:

• [Statement Caching in MySQL](https://dev.mysql.com/doc/refman/8.0/en/statement-caching.html)

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