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60 lines
3.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 4//EN">
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<HTML><HEAD>
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<TITLE>Administration Reference</TITLE>
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<A NAME="Top_Of_Page"></A>
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<H1>Administration Reference</H1>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf041.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Bot_Of_Page"><IMG SRC="../bot.gif" BORDER="0" ALT="[Bottom of Topic]"></A> <A HREF="auarf043.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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<P>
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<H2><A NAME="HDRBDBDB" HREF="auarf002.htm#ToC_40">bdb.DB0 and bdb.DBSYS1</A></H2>
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<P><STRONG>Purpose</STRONG>
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<A NAME="IDX4006"></A>
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<A NAME="IDX4007"></A>
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<A NAME="IDX4008"></A>
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<A NAME="IDX4009"></A>
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<A NAME="IDX4010"></A>
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<P>Contain the Backup Database and associated log
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<P><STRONG>Description</STRONG>
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<P>The <B>bdb.DB0</B> file contains the Backup Database, which
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records 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 Backup
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System commands.
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<P>The <B>bdb.DBSYS1</B> file is a log file in which the Backup
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Server (<B>buserver</B> process) logs each database operation before
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performing it. When an operation is interrupted, the Backup Server
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replays the log to complete the operation.
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<P>Both files are in binary format and reside in the <B>/usr/afs/db</B>
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directory on each database server machine that runs the Backup Server.
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When the 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
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<B>bdb.DB0</B> file matches the copy on the other database server
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machines. If not, the Backup Servers use AFS's distributed
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database technology, Ubik, to distribute to all of the machines the copy of
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the database with the highest version number.
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<P>Use the commands in the <B>backup</B> suite to administer the Backup
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Database. It is advisable to create a backup copy of the
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<B>bdb.DB0</B> file on tape on a regular basis, using the UNIX
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<B>tar</B> command or another local disk backup utility.
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<P><STRONG>Related Information</STRONG>
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<P><A HREF="auarf060.htm#HDRBK_INTRO">backup</A>
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<P><A HREF="auarf086.htm#HDRBK_SAVEDB">backup savedb</A>
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<P><A HREF="auarf125.htm#HDRBUSERVER">buserver</A>
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<P>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf041.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Top_Of_Page"><IMG SRC="../top.gif" BORDER="0" ALT="[Top of Topic]"></A> <A HREF="auarf043.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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