Gibt es hier Einschänkungen was Mysql Operationen betrifft?
https://docs.whmcs.com/System_Environme ... e#DatabaseDatabase Grant Privileges
When installing or updating WHMCS, or when activating or deactivating modules, the following grant privileges are required:
ALTER
CREATE
DROP
INDEX
For day to day use, only the following database grant privileges are required. All others may be disabled.
DELETE
INSERT
SELECT
UPDATE
LOCK TABLES
If you choose to restrict the grant privileges for day to day use, don't forget to grant the former privileges so database schema changes and optimizations can be performed by the update process.
Database Interaction
WHMCS internals utilize the PDO database API. If the PHP environment is v5.6, both a PDO based connection and a MySQL handle will be used for compatibility with legacy code.