If you're facing the "WordPress database size limit has exceeded" issue on hPanel, start by checking your database size in phpMyAdmin to identify large tables. Optimize the database by cleaning up expired transients, deleting spam comments, clearing post revisions, and removing unnecessary logs using plugins like WP-Optimize or WP-Sweep. Empty the trash for posts and comments, and deactivate unused plugins to free up space. To prevent future issues, limit post revisions by adding define('WP_POST_REVISIONS', 5); to your wp-config.php file and schedule regular database cleanups. If the database is still too large, consider upgrading your hosting plan for more space.