After upgrading the RHL6_MID to Ingres 11.1 and run the ?upgradedb? command on the database, it had some errors like E_DU2417_NODROP_SYSCAT and E_DU241A_SYSCAT_UPGRADE_FAILED. As a resolution, the client uses the unloaddb backup files to reload and fix the database. Actian however suggest to run verifydb command (verifydb -mreport -sdbname <dbname> -odbms_catalogs) to ensure that no problem exist in the database before upgrading to the newer version.