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-<!--$Id: memp_stat.so,v 10.28 2000/05/25 13:47:08 dda Exp $-->
-<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
-<!--All rights reserved.-->
-<html>
-<head>
-<title>Berkeley DB: DbEnv.memp_stat</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>
-<h1>DbEnv.memp_stat</h1>
-</td>
-<td width="1%">
-<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
-</td></tr></table>
-<hr size=1 noshade>
-<tt>
-<h3><pre>
-import com.sleepycat.db.*;
-<p>
-public DbMpoolStat memp_stat()
- throws DbException;
-<p>
-public DbMpoolFStat[] memp_fstat()
- throws DbException;
-</pre></h3>
-<h1>Description</h1>
-<p>The DbEnv.memp_stat and <a href="../api_java/memp_stat.html">DbEnv.memp_fstat</a> method create statistical
-structures and return to the caller. The statistics include the number
-of files participating in the pool, the active pages in the pool, and
-information as to how effective the cache has been.
-<p>The DbEnv.memp_stat method creates a DbMpoolStat object containing global
-statistics. The following data fields are available:
-<p><dl compact>
-<dt>public long st_gbytes;<dd>Gigabytes of cache (total cache size is st_gbytes + st_bytes)
-<dt>public long st_bytes;<dd>Bytes of cache (total cache size is st_gbytes + st_bytes)
-<dt>public int st_ncache;<dd>Number of caches.
-<dt>public int st_regsize;<dd>Individual cache size.
-<dt>public int st_cache_hit;<dd>Requested pages found in the cache.
-<dt>public int st_cache_miss;<dd>Requested pages not found in the cache.
-<dt>public int st_map;<dd>Requested pages mapped into the process' address space (there is no
-available information as to whether or not this request caused disk I/O,
-although examining the application page fault rate may be helpful).
-<dt>public int st_page_create;<dd>Pages created in the cache.
-<dt>public int st_page_in;<dd>Pages read into the cache.
-<dt>public int st_page_out;<dd>Pages written from the cache to the backing file.
-<dt>public int st_ro_evict;<dd>Clean pages forced from the cache.
-<dt>public int st_rw_evict;<dd>Dirty pages forced from the cache.
-<dt>public int st_hash_buckets;<dd>Number of hash buckets in buffer hash table.
-<dt>public int st_hash_searches;<dd>Total number of buffer hash table lookups.
-<dt>public int st_hash_longest;<dd>The longest chain ever encountered in buffer hash table lookups.
-<dt>public int st_hash_examined;<dd>Total number of hash elements traversed during hash table lookups.
-<dt>public int st_page_clean;<dd>Clean pages currently in the cache.
-<dt>public int st_page_dirty;<dd>Dirty pages currently in the cache.
-<dt>public int st_page_trickle;<dd>Dirty pages written using the <a href="../api_java/memp_trickle.html">DbEnv.memp_trickle</a> interface.
-<dt>public int st_region_wait;<dd>The number of times that a thread of control was forced to wait before
-obtaining the region lock.
-<dt>public int st_region_nowait;<dd>The number of times that a thread of control was able to obtain
-the region lock without waiting.
-</dl>
-<p>The <a href="../api_java/memp_stat.html">DbEnv.memp_fstat</a> method creates an array of DbMpoolFStat objects
-containing statistics for individual files in the pool. Each
-DbMpoolFStat object contains statistics for an individual DbMpoolFile.
-The following data fields are available for each DbMpoolFStat object:
-<p><dl compact>
-<dt>public String file_name;<dd>The name of the file.
-<dt>public long st_pagesize;<dd>Page size in bytes.
-<dt>public int st_cache_hit;<dd>Requested pages found in the cache.
-<dt>public int st_cache_miss;<dd>Requested pages not found in the cache.
-<dt>public int st_map;<dd>Requested pages mapped into the process' address space.
-<dt>public int st_page_create;<dd>Pages created in the cache.
-<dt>public int st_page_in;<dd>Pages read into the cache.
-<dt>public int st_page_out;<dd>Pages written from the cache to the backing file.
-</dl>
-<p>The DbEnv.memp_stat method throws an exception that encapsulates a non-zero error value on
-failure.
-<h1>Errors</h1>
-<p>The DbEnv.memp_stat method may fail and throw an exception encapsulating a non-zero error for the following conditions:
-<p><dl compact>
-<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
-</dl>
-<p>The DbEnv.memp_stat method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
-If a catastrophic error has occurred, the DbEnv.memp_stat method may fail and throw
-a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls
-will fail in the same way.
-<h3>Class</h3>
-<a href="../api_java/dbenv_class.html">DbEnv</a>
-<h1>See Also</h1>
-<a href="../api_java/memp_stat.html">DbEnv.memp_fstat</a>,
-<a href="../api_java/memp_stat.html">DbEnv.memp_stat</a>
-and
-<a href="../api_java/memp_trickle.html">DbEnv.memp_trickle</a>.
-</tt>
-<table><tr><td><br></td><td width="1%">
-<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
-</td></tr></table>
-<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
-</body>
-</html>