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55 lines
2.5 KiB
XML
55 lines
2.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry id="bdb_DB05">
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<refmeta>
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<refentrytitle>bdb.DB0, bdb.DBSYS1</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>bdb.DB0, bdb.DBSYS1</refname>
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<refpurpose>Contain the Backup Database and associated log</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>The <replaceable>bdb.DB0</replaceable> file contains the Backup Database, which records
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configuration information used by the AFS Backup System along with
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cross-indexed records of the tapes created and volumes dumped using the
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Backup System commands.</para>
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<para>The <replaceable>bdb.DBSYS1</replaceable> file is a log file in which the Backup Server
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(<emphasis role="bold">buserver</emphasis> process) logs each database operation before performing
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it. When an operation is interrupted, the Backup Server replays the log to
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complete the operation.</para>
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<para>Both files are in binary format and reside in the <replaceable>/usr/afs/db</replaceable> directory
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on each database server machine that runs the Backup Server. When the
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Backup Server starts or restarts on a given machine, it establishes a
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connection with its peers and verifies that its copy of the <replaceable>bdb.DB0</replaceable>
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file matches the copy on the other database server machines. If not, the
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Backup Servers use AFS's distributed database technology, Ubik, to
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distribute to all of the machines the copy of the database with the
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highest version number.</para>
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<para>Use the commands in the backup suite to administer the Backup Database. It
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is advisable to create a backup copy of the <replaceable>bdb.DB0</replaceable> file on tape on a
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regular basis, using the UNIX <emphasis role="bold">tar</emphasis> command or another local disk backup
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utility.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><link linkend="backup8">backup(8)</link>,
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<link linkend="backup_savedb8">backup_savedb(8)</link>,
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<link linkend="buserver8">buserver(8)</link></para>
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</refsect1>
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<refsect1>
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<title>Copyright</title>
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<para>IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.</para>
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<para>This documentation is covered by the IBM Public License Version 1.0. It was
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converted from HTML to POD by software written by Chas Williams and Russ
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Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.</para>
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</refsect1>
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</refentry>
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