diff options
Diffstat (limited to 'bdb/docs/ref/transapp/logfile.html')
| -rw-r--r-- | bdb/docs/ref/transapp/logfile.html | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/bdb/docs/ref/transapp/logfile.html b/bdb/docs/ref/transapp/logfile.html deleted file mode 100644 index 64d8a96475e..00000000000 --- a/bdb/docs/ref/transapp/logfile.html +++ /dev/null @@ -1,104 +0,0 @@ -<!--$Id: logfile.so,v 11.1 2000/07/25 16:31:20 bostic Exp $--> -<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.--> -<!--All rights reserved.--> -<html> -<head> -<title>Berkeley DB Reference Guide: Log file removal</title> -<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> -<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"> -</head> -<body bgcolor=white> - <a name="2"><!--meow--></a> -<table><tr valign=top> -<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Transaction Protected Applications</dl></h3></td> -<td width="1%"><a href="../../ref/transapp/archival.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/transapp/recovery.html"><img src="../../images/next.gif" alt="Next"></a> -</td></tr></table> -<p> -<h1 align=center>Log file removal</h1> -<p>The fourth component of the infrastructure, log file removal, concerns -the ongoing disk consumption of the database log files. Depending on -the rate at which the application writes to the databases and the -available disk space, the number of log files may increase quickly -enough that disk space will be a resource problem. For this reason, -you will periodically want to remove log files in order to conserve disk -space. This procedure is distinct from database and log file archival -for catastrophic recovery, and you cannot remove the current log files -simply because you have created a database snapshot or copied log files -to archival media. -<p>Log files may be removed at any time, as long as: -<ul type=disc> -<li>the log file is not involved in an active transaction -<li>at least two checkpoints have been written subsequent to the -log file's creation, and -<li>the log file is not the only log file in the environment. -</ul> -<p>Obviously, if you are preparing for catastrophic failure, you will want -to copy the log files to archival media before you remove them. -<p>To remove log files, take the following steps: -<p><ol> -<p><li>If you are concerned with catastrophic failure, first copy the log files -to backup media as described in <a href="archival.html">Archival for -catastrophic recovery</a>. -<p><li>Run <a href="../../utility/db_archive.html">db_archive</a> without options to identify all of the log files -that are no longer in use (e.g., no longer involved in an active -transaction). -<p><li>Remove those log files from the system. -</ol> -<p>The functionality provided by the <a href="../../utility/db_archive.html">db_archive</a> utility is also -available directly from the Berkeley DB library. The following code fragment -removes log files that are no longer needed by the database -environment. -<p><blockquote><pre>int -main(int argc, char *argv) -{ - ... -<p> -<b> /* Start a logfile removal thread. */ - if ((errno = pthread_create( - &ptid, NULL, logfile_thread, (void *)dbenv)) != 0) { - fprintf(stderr, - "txnapp: failed spawning log file removal thread: %s\n", - strerror(errno)); - exit (1); - }</b> -<p> - ... -} -<p> -<b>void * -logfile_thread(void *arg) -{ - DB_ENV *dbenv; - int ret; - char **begin, **list; -<p> - dbenv = arg; - dbenv->errx(dbenv, - "Log file removal thread: %lu", (u_long)pthread_self()); -<p> - /* Check once every 5 minutes. */ - for (;; sleep(300)) { - /* Get the list of log files. */ - if ((ret = log_archive(dbenv, &list, DB_ARCH_ABS, NULL)) != 0) { - dbenv->err(dbenv, ret, "log_archive"); - exit (1); - } -<p> - /* Remove the log files. */ - if (list != NULL) { - for (begin = list; *list != NULL; ++list) - if ((ret = remove(*list)) != 0) { - dbenv->err(dbenv, - ret, "remove %s", *list); - exit (1); - } - free (begin); - } - } - /* NOTREACHED */ -}</b></pre></blockquote> -<table><tr><td><br></td><td width="1%"><a href="../../ref/transapp/archival.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/transapp/recovery.html"><img src="../../images/next.gif" alt="Next"></a> -</td></tr></table> -<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> -</body> -</html> |