General error: 1651 Query cache is disabled; restart the server with query_cache_type=1 to enable it

Question

I am getting this error when I\'m trying to connect using PDO.

General error: 1651 Query cache is disabled; restart the server with query_cache_type=1 to enable          


        

Answer 1

This is a strange behavior of query_cache_type such that cannot be enabled if it wasn't enabled when the mysqld process started. But if it was enabled at startup, you can set query_cache_type "off" and then back on again if you need to.

That said, I would strongly encourage you to reconsider using the query cache at all. MySQL 8.0 has retired support for the query cache and removed it from the product. It's still a feature in MySQL 5.7, but it's deprecated as of 5.7.20.