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54 lines
2.5 KiB
XML
54 lines
2.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry id="prdb_DB05">
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<refmeta>
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<refentrytitle>prdb.DB0, prdb.DBSYS1</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>prdb.DB0, prdb.DBSYS1</refname>
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<refpurpose>Contain the Protection 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>prdb.DB0</replaceable> file contains the Protection Database, which maps AFS
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user, machine, and group names to their respective IDs (AFS UIDs and GIDs)
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and tracks group memberships. The Protection Server (<emphasis role="bold">ptserver</emphasis> process)
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uses the information in the database to help the File Server grant data
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access to authorized users.</para>
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<para>The <replaceable>prdb.DBSYS1</replaceable> file is a log file in which the Protection Server logs
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each database operation before performing it. When an operation is
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interrupted, the Protection Server replays the log to complete the
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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 of the cell's database server machines. When the Protection Server
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starts or restarts on a given machine, it establishes a connection with
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its peers and verifies that its copy of the database matches the copy on
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the other database server machines. If not, the Protection Servers call on
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AFS's distributed database technology, Ubik, to distribute to all of the
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machines the copy of the database with the highest version number.</para>
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<para>Always use the commands in the <emphasis role="bold">pts</emphasis> suite to administer the Protection
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Database. It is advisable to create an archive copy of the database on a
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regular basis, using a tool such as the UNIX <emphasis role="bold">tar</emphasis> command.</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="prdb_check8">prdb_check(8)</link>,
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<link linkend="pts1">pts(1)</link>,
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<link linkend="ptserver8">ptserver(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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