User Guide : 16. Performing Backup and Recovery : Backup and Recovery of the Master Database (iidbdb)
 
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Backup and Recovery of the Master Database (iidbdb)
The iidbdb database is the master database for the installation. It contains information about your installation as a whole, such as:
Which databases exist in this installation
Where user databases are located
Which locations can be used for files
Which users can access databases
The iidbdb also contains information about groups, roles, and database privileges defined for your site.
The iidbdb is journaled by default.