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98 lines
4.7 KiB
HTML
<!--$Id: db_recover.so,v 10.22 2000/05/10 17:56:02 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: db_recover</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>db_recover</h1>
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</td>
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<td width="1%">
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<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>db_recover [<b>-cVv</b>] [<b>-h home</b>] [<b>-t [[CC]YY]MMDDhhmm[.SS]]</b>]</pre></h3>
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<h1>Description</h1>
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<a name="3"><!--meow--></a>
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<p>The db_recover utility must be run after an unexpected application,
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Berkeley DB, or system failure to restore the database to a consistent state.
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All committed transactions are guaranteed to appear after db_recover
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has run, and all uncommitted transactions will be completely undone.
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<p>The options are as follows:
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<p><dl compact>
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<p><dt><b>-c</b><dd>Perform catastrophic recovery instead of normal recovery.
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<p><dt><b>-h</b><dd>Specify a home directory for the database environment; by
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default, the current working directory is used.
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<p><dt><b>-t</b><dd>Recover to the time specified rather than to the most current possible
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date. The timestamp argument should be in the form
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[[CC]YY]MMDDhhmm[.SS] where each pair of
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letters represents the following:
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<p><dl compact>
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<p><dt>CC<dd>The first two digits of the year (the century).
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<dt>YY<dd>The second two digits of the year. If "YY" is specified, but "CC" is not,
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a value for "YY" between 69 and 99 results in a "YY" value of 19. Otherwise,
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a "YY" value of 20 is used.
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<dt>MM<dd>The month of the year, from 1 to 12.
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<dt>DD<dd>The day of the month, from 1 to 31.
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<dt>hh<dd>The hour of the day, from 0 to 23.
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<dt>mm<dd>The minute of the hour, from 0 to 59.
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<dt>SS<dd>The second of the minute, from 0 to 61.
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</dl>
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<p>If the "CC" and "YY" letter pairs are not specified, the values default
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to the current year. If the "SS" letter pair is not specified, the value
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defaults to 0.
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<p><dt><b>-V</b><dd>Write the version number to the standard output and exit.
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<p><dt><b>-v</b><dd>Run in verbose mode.
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</dl>
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<p>In the case of catastrophic recovery, an archival copy, or
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<i>snapshot</i> of all database files must be restored along with all
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of the log files written since the database file snapshot was made. (If
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disk space is a problem, log files may be referenced by symbolic links).
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For further information on creating a database snapshot, see
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<a href="../ref/transapp/archival.html">Archival Procedures</a>.
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For further information on performing recovery, see
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<a href="../ref/transapp/recovery.html">Recovery Procedures</a>.
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<p>If the failure was not catastrophic, the files present on the system at the
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time of failure are sufficient to perform recovery.
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<p>If log files are missing, db_recover will identify the missing
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log file(s) and fail, in which case the missing log files need to be
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restored and recovery performed again.
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<p>The db_recover utility uses a Berkeley DB environment (as described for the
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<b>-h</b> option, the environment variable <b>DB_HOME</b>, or,
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because the utility was run in a directory containing a Berkeley DB
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environment). In order to avoid environment corruption when using a Berkeley DB
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environment, db_recover should always be given the chance to detach from
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the environment and exit gracefully. To cause db_recover to release all
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environment resources and exit cleanly, send it an interrupt signal
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(SIGINT).
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<p>The db_recover utility exits 0 on success, and >0 if an error occurs.
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<h1>Environment Variables</h1>
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<p><dl compact>
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<p><dt>DB_HOME<dd>If the <b>-h</b> option is not specified and the environment variable
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DB_HOME is set, it is used as the path of the database home, as described
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in <a href="../api_c/env_open.html">DBENV->open</a>.
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</dl>
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<h1>See Also</h1>
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<a href="../utility/berkeley_db_svc.html">berkeley_db_svc</a>,
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<a href="../utility/db_archive.html">db_archive</a>,
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<a href="../utility/db_checkpoint.html">db_checkpoint</a>,
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<a href="../utility/db_deadlock.html">db_deadlock</a>,
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<a href="../utility/db_dump.html">db_dump</a>,
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<a href="../utility/db_load.html">db_load</a>,
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db_recover,
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<a href="../utility/db_stat.html">db_stat</a>,
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<a href="../utility/db_upgrade.html">db_upgrade</a>,
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and
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<a href="../utility/db_verify.html">db_verify</a>.
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</tt>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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</html>
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