Accessing the database

After the initial system load on the target fallback release, RCBs are incompatible. Shutting down TMF twice prior to the fallback simply prevents TMF volume recovery from encountering those RCBs after the fallback. To enable regular access to database objects, run the mxtool fixrcb command before any other SQL activity.

This command regenerates RCBs for SQL/MX objects in all catalogs that were originally created on the system.

If the system fallback is performed for a clustered or networked environment, you must fall back all affected systems simultaneously and must run the mxtool fixrcb command on each involved system.

To ensure database recoverability after a system fallback, you must take a full set of online dumps after executing the mxtool fixrcb command successfully. For more information on the mxtool fixrcb command, see the SQL/MX Release Reference Manual.