2011-09-13 17:44:24 +00:00
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<title>db_hotbackup</title>
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="utilities.html" title="Appendix A. Berkeley DB Command Line Utilities" />
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">db_hotbackup</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="db_dump.html">Prev</a> </td>
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<th width="60%" align="center">Appendix A.
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Berkeley DB Command Line Utilities
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="db_load.html">Next</a></td>
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</tr>
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<hr />
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="db_hotbackup"></a>db_hotbackup</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">db_hotbackup [-cDEguVv] [-d data_dir ...] [-h home]
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[-l log_dir] [-P password] -b backup_dir </pre>
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<p>
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The <span class="command"><strong>db_hotbackup</strong></span> utility creates "hot backup" or "hot failover"
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snapshots of Berkeley DB database environments.
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</p>
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<p>
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The <span class="command"><strong>db_hotbackup</strong></span> utility performs the following steps:
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</p>
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<div class="orderedlist">
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<ol type="1">
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<li>
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<p>
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Sets the
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<a class="xref" href="envset_flags.html#set_flags_DB_HOTBACKUP_IN_PROGRESS">
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<code class="literal">DB_HOTBACKUP_IN_PROGRESS</code>
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</a>
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flag in the home database environment.
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</p>
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</li>
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<li>
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<p>
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If the <span class="bold"><strong>-c</strong></span> option is specified,
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checkpoint the source home database environment, and remove any
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unnecessary log files.
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</p>
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</li>
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<li>
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<p>
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If the target directory for the backup does not exist, it is created
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with mode read-write-execute for the owner.
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</p>
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<p>
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If the target directory for the backup does exist and the <span class="bold"><strong>-u</strong></span> option was specified, all log files in the
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target directory are removed; if the <span class="bold"><strong>-u</strong></span> option was not specified, all files in the
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target directory are removed.
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</p>
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</li>
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<li>
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<p>
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If the <span class="bold"><strong>-u</strong></span> option was not specified,
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copy application-specific files found in the database environment home
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directory, and any directories specified using the <span class="bold"><strong>-d</strong></span> option, into the target directory for the
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backup.
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</p>
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</li>
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<li>
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<p>
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Copy all log files found in the directory specified by the <span class="bold"><strong>-l</strong></span> option (or in the database environment home
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directory, if no <span class="bold"><strong>-l</strong></span> option was
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specified), into the target directory for the backup.
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</p>
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</li>
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<li>
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<p>
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Perform catastrophic recovery in the target directory for the backup.
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</p>
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</li>
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<li>
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<p>
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Remove any unnecessary log files from the target directory for the
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backup.
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</p>
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</li>
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<li>
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<p>
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Reset the
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<a class="xref" href="envset_flags.html#set_flags_DB_HOTBACKUP_IN_PROGRESS">
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<code class="literal">DB_HOTBACKUP_IN_PROGRESS</code>
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</a>
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flag in the environment.
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</p>
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</li>
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</ol>
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</div>
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<p>
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The <span class="command"><strong>db_hotbackup</strong></span> utility does not resolve pending transactions that
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are in the prepared state.
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<span>
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Applications that use
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<a class="xref" href="txnprepare.html" title="DbTxn::prepare()">DbTxn::prepare()</a> must specify
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<a class="link" href="envopen.html#envopen_DB_RECOVER_FATAL">DB_RECOVER_FATAL</a>
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when opening the environment, and run
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<a class="xref" href="txnrecover.html" title="DbEnv::txn_recover()">DbEnv::txn_recover()</a> to
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resolve any pending transactions, when failing over to the backup.
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</span>
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</p>
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<p>
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The options are as follows:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<span class="bold"><strong>-b</strong></span>
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</p>
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<p>
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Specify the target directory for the backup.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-c</strong></span>
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</p>
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<p>
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Before performing the backup, checkpoint the source database
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environment and remove any log files that are no longer required in
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that environment. <span class="bold"><strong>To avoid making catastrophic
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recovery impossible, log file removal must be integrated with log file
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archival.</strong></span>
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-D</strong></span>
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</p>
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<p>
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Use the data and log directories listed in a <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
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configuration file in the source directory. This option
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has four effects:
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</p>
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<div class="itemizedlist">
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<ul type="circle">
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<li>
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<p>
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The specified data and log directories will be created relative to the
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target directory, with mode read-write-execute owner, if they do not
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already exist.
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</p>
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</li>
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<li>
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<p>
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In step #3 above, all files in any source data
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directories specified in the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file will
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be copied to the target data directories.
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</p>
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</li>
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<li>
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<p>
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In step #4 above, log files will be copied from
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any log directory specified in the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
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file, instead of from the default locations.
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</p>
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</li>
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<li>
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<p>
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The <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> configuration file will be copied
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from the source directory to the target directory,
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and subsequently used for configuration if recovery
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is run in the target directory.
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</p>
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</li>
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</ul>
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</div>
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<p>
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Care should be taken with the <span class="bold"><strong>-D</strong></span>
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option where data and log directories are named relative to the source
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directory but are not subdirectories (that is, the name includes the
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element "..") Specifically, the constructed target directory names
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must be meaningful and distinct from the source directory names,
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otherwise running recovery in the target directory might corrupt the
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source data files.
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</p>
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<p>
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<span class="bold"><strong>It is an error to use absolute pathnames for
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data or log directories in this mode, as the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
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configuration file copied into the target directory would
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then point at the source directories and running recovery
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would corrupt the source data files.</strong></span>
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-d</strong></span>
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</p>
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<p>
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Specify one or more directories that contain data files to be copied
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to the target directory.
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</p>
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<p>
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<span class="bold"><strong>As all database files are copied into a single
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target directory, files named the same, stored in different source
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directories, would overwrite each other when copied to the target
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directory.</strong></span>
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</p>
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<p>
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Please note the database environment recovery log references database
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files as they are named by the application program. <span class="bold"><strong>If the application uses absolute or relative pathnames to
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name database files, (rather than filenames and the
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<a class="xref" href="envset_data_dir.html" title="DbEnv::set_data_dir()">DbEnv::set_data_dir()</a>
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method or the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> configuration file to specify
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filenames), running recovery in the target directory may
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not properly find the copies of the files or might even
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find the source files, potentially resulting in
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corruption.</strong></span>
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-F</strong></span>
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</p>
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<p>
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Directly copy from the filesystem. This option can
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<span class="bold"><strong>CORRUPT</strong></span> the backup if used
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while the environment is active and the operating system does
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not support atomic file system reads. This option is known to
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be safe only on UNIX systems, not Linux or Windows systems.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-g</strong></span>
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</p>
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<p>
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Turn on debugging options. In particular this will leave the
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log files in the backup directory after running recovery.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-h</strong></span>
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</p>
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<p>
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Specify the source directory for the backup. That is, the
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database environment home directory.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-l</strong></span>
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</p>
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<p>
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Specify a source directory that contains log files; if none is
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specified, the database environment home directory will be searched
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for log files. If a relative path is specified, the path
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is evaluated relative to the home directory.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-P</strong></span>
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</p>
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<p>
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Specify an environment password. Although Berkeley DB utilities
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overwrite password strings as soon as possible, be aware there may be
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a window of vulnerability on systems where unprivileged users can see
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command-line arguments or where utilities are not able to overwrite
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the memory containing the command-line arguments.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-u</strong></span>
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</p>
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<p>
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Update a pre-existing hot backup snapshot by copying in new log files.
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If the <span class="bold"><strong>-u</strong></span> option is specified, no
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databases will be copied into the target directory. If applications
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that update the environment are using the transactional bulk insert
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optimization, this option must be used with special care.
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For more information, see the
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section on Hot Backup in the <span class="emphasis"><em>Getting Started
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With Transaction Processing Guide</em></span>.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-V</strong></span>
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</p>
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<p>
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Write the library version number to the standard output, and exit.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-v</strong></span>
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</p>
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<p>
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Run in verbose mode, listing operations as they are done.
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</p>
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</li>
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</ul>
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</div>
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<p>
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The <span class="command"><strong>db_hotbackup</strong></span> utility uses a Berkeley DB
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environment (as described for the <span class="bold"><strong>-h</strong></span> option, the environment variable
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<span class="bold"><strong>DB_HOME</strong></span>, or because the
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utility was run in a directory containing a Berkeley DB
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|
environment).
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|
In order to avoid environment corruption when using a Berkeley DB
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|
|
environment, <span class="command"><strong>db_hotbackup</strong></span> should always be given the chance to detach
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|
|
from the environment and exit gracefully. To cause <span class="command"><strong>db_hotbackup</strong></span> to
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|
|
release all environment resources and exit cleanly, send it an
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interrupt signal (SIGINT).
|
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|
|
</p>
|
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|
|
<p>
|
|
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|
|
The <span class="command"><strong>db_hotbackup</strong></span> utility exits 0 on success, and >0 if an error
|
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|
|
occurs.
|
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|
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|
|
</p>
|
|
|
|
|
|
<div class="sect2" lang="en" xml:lang="en">
|
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|
|
<div class="titlepage">
|
|
|
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|
|
<div>
|
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|
|
<div>
|
2011-12-20 00:07:10 +00:00
|
|
|
|
<h3 class="title"><a id="id3657429"></a>Environment Variables</h3>
|
2011-09-13 17:44:24 +00:00
|
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|
|
</div>
|
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</div>
|
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</div>
|
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|
|
<div class="sect3" lang="en" xml:lang="en">
|
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|
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|
|
<div class="titlepage">
|
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|
|
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|
<div>
|
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<div>
|
2011-12-20 00:07:10 +00:00
|
|
|
|
<h4 class="title"><a id="id3657830"></a>DB_HOME</h4>
|
2011-09-13 17:44:24 +00:00
|
|
|
|
</div>
|
|
|
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|
|
</div>
|
|
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|
|
</div>
|
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|
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|
|
<p>
|
|
|
|
|
|
If the <span class="bold"><strong>-h</strong></span> 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 the
|
|
|
|
|
|
<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method.
|
|
|
|
|
|
</p>
|
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|
</div>
|
|
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="db_dump.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="utilities.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="db_load.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">db_dump </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> db_load</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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