I was upgrading my WHMCS billing software and ran into this errror:
SQLSTATE[HY000]: General error: 1615 Prepared statement needs to be re-prepared (SQL: select distinct setting, value from tblconfiguration)
According to the Billing software support, I need to increase the value of table_definition_cache in the server MySQL configuration.
I use WHM/cPanel and really don't know where to start. My googling hasn't helped much either.