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.