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95 строки
4.0 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>db_checkpoint</TITLE>
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</HEAD>
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<BODY BGCOLOR=white>
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<H1>db_checkpoint</H1>
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<HR SIZE=1 NOSHADE>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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<B>db</B>_<B>checkpoint</B> [<B>-1v</B>] [<B>-h</B> <B>home</B>] [<B>-k</B> <B>kbytes</B>] [<B>-L</B> <B>file</B>] [<B>-p</B> <B>min</B>]
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The db_checkpoint utility is a daemon process that
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monitors the database log and periodically calls
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<B><A HREF="db_txn.html">txn_checkpoint(3)</A></B> to checkpoint it.
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The options are as follows:
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<B>-1</B> Checkpoint the log once, and then exit.
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<B>-h</B> Specify a home directory for the database.
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<B>-k</B> Checkpoint the database at least as often as every
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kbytes of log file are written.
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<B>-L</B> Log the execution of the db_checkpoint utility to the
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specified file in the following format, where ``###''
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is the process ID, and the date is the time the
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utility starting running.
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db_checkpoint: ### Wed Jun 15 01:23:45 EDT 1995
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This file will be removed if the db_checkpoint
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utility exits gracefully.
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<B>-p</B> Checkpoint the database at least every min minutes.
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<B>-v</B> Write the time of each checkpoint to the standard
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output.
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At least one of the <B>-1</B>, <B>-k</B> and <B>-p</B> options must be
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specified.
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The db_checkpoint utility attaches to DB shared memory
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regions. In order to avoid region corruption, it should
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always be given the chance to detach and exit gracefully.
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To cause db_checkpoint to clean up after itself and exit,
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send it an interrupt signal (SIGINT).
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The db_checkpoint utility exits 0 on success, and >0 if an
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error occurs.
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</PRE>
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<H2>ENVIRONMENT VARIABLES</H2><PRE>
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The following environment variables affect the execution
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of db_checkpoint:
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DB_HOME
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If the <B>-h</B> option is not specified and the environment
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variable DB_HOME is set, it is used as the path of
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the database home, as described in <B><A HREF="db_appinit.html">db_appinit(3)</A></B>.
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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The DB library is a family of groups of functions that
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provides a modular programming interface to transactions
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and record-oriented file access. The library includes
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support for transactions, locking, logging and file page
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caching, as well as various indexed access methods. Many
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of the functional groups (e.g., the file page caching
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functions) are useful independent of the other DB
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functions, although some functional groups are explicitly
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based on other functional groups (e.g., transactions and
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logging). For a general description of the DB package,
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see <B><A HREF="db_intro.html">db_intro(3)</A></B>.
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<B><A HREF="db_archive.html">db_archive(1)</A></B>, <B><A HREF="db_checkpoint.html">db_checkpoint(1)</A></B>, <B><A HREF="db_deadlock.html">db_deadlock(1)</A></B>, <B><A HREF="db_dump.html">db_dump(1)</A></B>,
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<B><A HREF="db_load.html">db_load(1)</A></B>, <B><A HREF="db_recover.html">db_recover(1)</A></B>, <B><A HREF="db_stat.html">db_stat(1)</A></B>, <B><A HREF="db_intro.html">db_intro(3)</A></B>,
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<B><A HREF="db_appinit.html">db_appinit(3)</A></B>, <B><A HREF="db_cursor.html">db_cursor(3)</A></B>, <B><A HREF="db_dbm.html">db_dbm(3)</A></B>, <B><A HREF="db_internal.html">db_internal(3)</A></B>,
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<B><A HREF="db_lock.html">db_lock(3)</A></B>, <B><A HREF="db_log.html">db_log(3)</A></B>, <B><A HREF="db_mpool.html">db_mpool(3)</A></B>, <B><A HREF="db_open.html">db_open(3)</A></B>, <B><A HREF="db_thread.html">db_thread(3)</A></B>,
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<B><A HREF="db_txn.html">db_txn(3)</A></B>
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</PRE>
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