Why Does MySQL Throw \'Prepared Statement Needs to Be Re-prepared\' After an Upgrade?

Troubleshooting MySQL Error: "Prepared Statement Needs to Be Re-prepared"

Question:

After upgrading a PHP application with stored procedures, users encounter a critical error on a hosting server. The error reads, "Prepared statement needs to be re-prepared." What could be the cause?

Answer:

According to MySQL bug #42041, this error may arise due to an insufficient value for table_definition_cache.

Solution:

To resolve this issue, try increasing the value of table_definition_cache in the MySQL configuration file (my.cnf):

[mysqld]
table_definition_cache=<new_value>

For details on adjusting statement caching, refer to the MySQL documentation:

https://dev.mysql.com/doc/refman/8.0/en/statement-caching.html

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