WHMCS Tags system-requirements To prevent problems, we recommend testing updates and customizations in a test environment before applying them to your production server. Troubleshoot and resolve Allowed memory size of xxxxx bytes exhausted errors. Troubleshoot and resolve new versions not appearing after checking for updates. Use System Health to view your system environment status and quickly find and address issues. Troubleshoot and resolve Unable to connect to the database errors. WHMCS automatically checks for new updates daily. You can also check for updates to WHMCS manually from within the Admin Area. As your database size increases, you may experience slower page loads and other speed-related issues. Optimizing your database and reducing unnecessary data can help WHMCS run faster.