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

The above is the detailed content of Why Does MySQL Throw \"Prepared Statement Needs to Be Re-prepared\" After an Upgrade?. For more information, please follow other related articles on the PHP Chinese website!