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4.0 KiB
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<!--$Id: db_checkpoint.so,v 10.22 2000/04/03 20:10:39 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_checkpoint</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_checkpoint</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_checkpoint [<b>-1Vv</b>]
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[<b>-h home</b>] [<b>-k kbytes</b>] [<b>-L file</b>] [<b>-p min</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_checkpoint utility is a daemon process that monitors the
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database log and periodically calls <a href="../api_c/txn_checkpoint.html">txn_checkpoint</a> to checkpoint it.
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<p>The options are as follows:
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<p><dl compact>
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<p><dt><b>-1</b><dd>Checkpoint the log once, regardless of whether or not there has
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been activity since the last checkpoint, and then exit.
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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>-k</b><dd>Checkpoint the database at least as often as every <b>kbytes</b> of log
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file are written.
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<p><dt><b>-L</b><dd>Log the execution of the db_checkpoint utility to the specified file in the
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following format, where <i>###</i> is the process ID, and the date
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is the time the utility was started.
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<p><blockquote><pre>db_checkpoint: ### Wed Jun 15 01:23:45 EDT 1995</pre></blockquote>
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This file will be removed if the db_checkpoint utility exits gracefully.
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<p><dt><b>-p</b><dd>Checkpoint the database at least every <b>min</b> minutes if
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there has been any activity since the last checkpoint.
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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>Write the time of each checkpoint attempt to the standard
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output.
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</dl>
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<p>At least one of the <b>-1</b>, <b>-k</b> and <b>-p</b> options must
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be specified.
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<p>The db_checkpoint 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_checkpoint should always be given the chance to detach from
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the environment and exit gracefully. To cause db_checkpoint 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_checkpoint utility does not attempt to create the Berkeley DB
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shared memory regions if they do not already exist. The application
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which creates the region should be started first, and then, once the
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region is created, the db_checkpoint utility should be started.
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<p>The db_checkpoint 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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db_checkpoint,
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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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<a href="../utility/db_recover.html">db_recover</a>,
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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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