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100 строки
4.4 KiB
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<HTML>
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<HEAD>
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<TITLE>db_deadlock</TITLE>
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<BODY BGCOLOR=white>
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<H1>db_deadlock</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>deadlock</B> [<B>-vw</B>] [<B>-a</B> <B>m</B> <B>|</B> <B>o</B> <B>|</B> <B>y</B>] [<B>-h</B> <B>home</B>] [<B>-L</B> <B>file</B> ] [<B>-t</B> <B>sec</B> ]
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The db_deadlock utility traverses the database lock
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structures and aborts a transaction each time it detects a
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deadlock. This utility should be run as a background
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daemon whenever multiple threads or processes are using
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locking. By default, a random transaction involved in the
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deadlock is aborted.
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The options are as follows:
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<B>-a</B> When a deadlock is detected, abort the oldest (``o'')
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transaction, the youngest (``y'') transaction, or the
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transaction with the minimum number of locks (``m'').
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<B>-h</B> Specify a home directory for the database.
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<B>-L</B> Log the execution of the db_deadlock 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_deadlock: ### Wed Jun 15 01:23:45 EDT 1995
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This file will be removed if the db_deadlock utility
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exits gracefully.
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<B>-t</B> Initiate a pass over the database locks at least
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every sec seconds.
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<B>-v</B> Run in verbose mode, generating messages each time
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the detector runs.
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<B>-w</B> Make a single pass over the database locks every time
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a process is forced to wait for a lock.
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At least one of the <B>-t</B> and <B>-w</B> options must be specified.
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The db_deadlock 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_deadlock to clean up after itself and exit,
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send it an interrupt signal (SIGINT).
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The db_deadlock 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_deadlock:
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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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