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.