User Guide : 16. Performing Backup and Recovery : Backup and Recovery of the Master Database (iidbdb) : The iidbdb and Checkpointing
 
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The iidbdb and Checkpointing
You should regularly checkpoint and journal the iidbdb database. Ckpdb and rollforwarddb are the supported utilities for recovering the iidbdb if it is lost or damaged for any reason. The system catalogs containing the installation information for groups, roles, and database privileges are stored in the iidbdb database and can only be recovered from backups.