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<!--$Id: db_recover.so,v 10.32 2007/10/26 15:02:55 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <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,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <b>db_recover</b> </td> </tr></table> <hr size=1 noshade> <tt> <b><pre>db_recover [<b>-cefVv</b>] [<b>-h home</b>] [<b>-P password</b>] [<b>-t [[CC]YY]MMDDhhmm[.SS]]</b>]</pre></b> <b>Description</b> <a name="2"><!--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> <p>The options are as follows:</p> <br> <b>-c</b><ul compact><li>Perform catastrophic recovery instead of normal recovery.</ul> <b>-e</b><ul compact><li>Retain the environment after running recovery. This option will rarely be used unless a <a href="../../db4-devel-4.7.25/ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file is present in the home directory. If a <a href="../../db4-devel-4.7.25/ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file is not present, then the regions will be created with default parameter values.</ul> <b>-f</b><ul compact><li>Display a message on the standard output showing the percent of recovery completed.</ul> <b>-h</b><ul compact><li>Specify a home directory for the database environment; by default, the current working directory is used.</ul> <b>-P</b><ul compact><li>Specify an environment password. Although Berkeley DB utilities overwrite password strings as soon as possible, be aware there may be a window of vulnerability on systems where unprivileged users can see command-line arguments or where utilities are not able to overwrite the memory containing the command-line arguments.</ul> <b>-t</b><ul compact><li>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:</ul> <br> <b>CC</b><ul compact><li>The first two digits of the year (the century).</ul> <b>YY</b><ul compact><li>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 "CC" value of 19. Otherwise, a "CC" value of 20 is used.</ul> <b>MM</b><ul compact><li>The month of the year, from 1 to 12.</ul> <b>DD</b><ul compact><li>The day of the month, from 1 to 31.</ul> <b>hh</b><ul compact><li>The hour of the day, from 0 to 23.</ul> <b>mm</b><ul compact><li>The minute of the hour, from 0 to 59.</ul> <b>SS</b><ul compact><li>The second of the minute, from 0 to 61.</ul> <br> <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> <b>-V</b><ul compact><li>Write the library version number to the standard output, and exit.</ul> <b>-v</b><ul compact><li>Run in verbose mode.</ul> <br> <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-4.7.25/ref/transapp/archival.html">Archival Procedures</a>. For further information on performing recovery, see <a href="../../db4-devel-4.7.25/ref/transapp/recovery.html">Recovery Procedures</a>.</p> <p>If the failure was not catastrophic, the files present on the system at the time of failure are sufficient to perform recovery.</p> <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> <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> <p>The db_recover utility exits 0 on success, and >0 if an error occurs.</p> <br><b>Environment Variables</b> <br> <b>DB_HOME</b><ul compact><li>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-4.7.25/api_c/env_open.html">DB_ENV->open</a>.</ul> <br> </tt> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>
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