<!--$Id: db_recover.so,v 10.24 2001/04/21 19:23:16 bostic Exp $--> <!--Copyright 1997-2001 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <html> <head> <title>Berkeley DB: db_recover</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h1>db_recover</h1> </td> <td align=right> <a href="../../db4-devel-4.0.14/api_c/c_index.html"><img src="../../db4-4.0.14/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.0.14/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre>db_recover [<b>-ceVv</b>] [<b>-h home</b>] [<b>-t [[CC]YY]MMDDhhmm[.SS]]</b>]</pre></h3> <h1>Description</h1> <a name="3"><!--meow--></a> <p>The db_recover utility must be run after an unexpected application, Berkeley DB, or system failure to restore the database to a consistent state. All committed transactions are guaranteed to appear after db_recover has run, and all uncommitted transactions will be completely undone. <p>The options are as follows: <p><dl compact> <p><dt><b>-c</b><dd>Perform catastrophic recovery instead of normal recovery. <p><dt><b>-e</b><dd>Retain the environment after running recovery. This option will rarely be used unless a DB_CONFIG file is present in the home directory. If a DB_CONFIG file is not present, then the regions will be created with default parameter values. <p><dt><b>-h</b><dd>Specify a home directory for the database environment; by default, the current working directory is used. <p><dt><b>-t</b><dd>Recover to the time specified rather than to the most current possible date. The timestamp argument should be in the form [[CC]YY]MMDDhhmm[.SS] where each pair of letters represents the following: <p><dl compact> <p><dt>CC<dd>The first two digits of the year (the century). <dt>YY<dd>The second two digits of the year. If "YY" is specified, but "CC" is not, a value for "YY" between 69 and 99 results in a "YY" value of 19. Otherwise, a "YY" value of 20 is used. <dt>MM<dd>The month of the year, from 1 to 12. <dt>DD<dd>The day of the month, from 1 to 31. <dt>hh<dd>The hour of the day, from 0 to 23. <dt>mm<dd>The minute of the hour, from 0 to 59. <dt>SS<dd>The second of the minute, from 0 to 61. </dl> <p>If the "CC" and "YY" letter pairs are not specified, the values default to the current year. If the "SS" letter pair is not specified, the value defaults to 0. <p><dt><b>-V</b><dd>Write the library version number to the standard output, and exit. <p><dt><b>-v</b><dd>Run in verbose mode. </dl> <p>In the case of catastrophic recovery, an archival copy -- or <i>snapshot</i> -- of all database files must be restored along with all of the log files written since the database file snapshot was made. (If disk space is a problem, log files may be referenced by symbolic links). For further information on creating a database snapshot, see <a href="../../db4-devel-4.0.14/ref/transapp/archival.html">Archival Procedures</a>. For further information on performing recovery, see <a href="../../db4-devel-4.0.14/ref/transapp/recovery.html">Recovery Procedures</a>. <p>If the failure was not catastrophic, the files present on the system at the time of failure are sufficient to perform recovery. <p>If log files are missing, db_recover will identify the missing log file(s) and fail, in which case the missing log files need to be restored and recovery performed again. <p>The db_recover utility uses a Berkeley DB environment (as described for the <b>-h</b> option, the environment variable <b>DB_HOME</b>, or because the utility was run in a directory containing a Berkeley DB environment). In order to avoid environment corruption when using a Berkeley DB environment, db_recover should always be given the chance to detach from the environment and exit gracefully. To cause db_recover to release all environment resources and exit cleanly, send it an interrupt signal (SIGINT). <p>The db_recover utility exits 0 on success, and >0 if an error occurs. <h1>Environment Variables</h1> <p><dl compact> <p><dt>DB_HOME<dd>If the <b>-h</b> option is not specified and the environment variable DB_HOME is set, it is used as the path of the database home, as described in <a href="../../db4-devel-4.0.14/api_c/env_open.html">DB_ENV->open</a>. </dl> <h1>See Also</h1> <a href="../../db4-4.0.14/utility/berkeley_db_svc.html">berkeley_db_svc</a>, <a href="../../db4-4.0.14/utility/db_archive.html">db_archive</a>, <a href="../../db4-4.0.14/utility/db_checkpoint.html">db_checkpoint</a>, <a href="../../db4-4.0.14/utility/db_deadlock.html">db_deadlock</a>, <a href="../../db4-4.0.14/utility/db_dump.html">db_dump</a>, <a href="../../db4-4.0.14/utility/db_load.html">db_load</a>, db_recover, <a href="../../db4-4.0.14/utility/db_stat.html">db_stat</a>, <a href="../../db4-4.0.14/utility/db_upgrade.html">db_upgrade</a>, and <a href="../../db4-4.0.14/utility/db_verify.html">db_verify</a>. </tt> <p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> </body> </html>
