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You should have Install SYSADM authority for the commands. If you do not, DB2
will check for your authorization, and if the directory objects (DSNDB01) are in
GRECP, it is likely to fail. Because Install SYSADM is defined in DSNZPARM, it is
validated by that means.
If you fail to recover GRECP pages by START DATABASE command, you can
recover the pages by using the RECOVER utility. See Chapter 23. “RECOVER”
of DB2 for z/OS Version 8 Utility Guide and Reference, SC18-7427. It may take a
long time to recover objects in GRECP status, depending on the workload on
your system.
6.1.5 Best practices for GRECP/LPL recovery
Here ...