NAME

       prdb.DB0, prdb.DBSYS1 - Contain the Protection Database and associated log

DESCRIPTION

       The prdb.DB0 file contains the Protection Database, which maps AFS user, machine, and group names to
       their respective IDs (AFS UIDs and GIDs) and tracks group memberships. The Protection Server (ptserver
       process) uses the information in the database to help the File Server grant data access to authorized
       users.

       The prdb.DBSYS1 file is a log file in which the Protection Server logs each database operation before
       performing it.  When an operation is interrupted, the Protection Server replays the log to complete the
       operation.

       Both files are in binary format and reside in the /var/lib/openafs/db directory on each of the cell's
       database server machines. When the Protection Server starts or restarts on a given machine, it
       establishes a connection with its peers and verifies that its copy of the database matches the copy on
       the other database server machines. If not, the Protection Servers call on AFS's distributed database
       technology, Ubik, to distribute to all of the machines the copy of the database with the highest version
       number.

       Always use the commands in the pts suite to administer the Protection Database. It is advisable to create
       an archive copy of the database on a regular basis, using a tool such as the UNIX tar command.

SEE ALSO

       prdb_check(8), pts(1), ptserver(8)

COPYRIGHT

       IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.  It was converted from HTML to POD
       by software written by Chas Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth
       Cassell.