PRDB.DB0(5)							AFS File Reference						       PRDB.DB0(5)

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.

OpenAFS 							    2012-03-26							       PRDB.DB0(5)