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Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
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<th colspan="3" align="center">DB-&gt;stat()</th>
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<th width="60%" align="center">Chapter 2. 
The DB Handle
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<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="dbstat"></a>DB-&gt;stat()</h2>
</div>
</div>
</div>
<pre class="programlisting">#include &lt;db.h&gt;
int
DB-&gt;stat(DB *db, DB_TXN *txnid, void *sp, u_int32_t flags); </pre>
<p>
The <code class="methodname">DB-&gt;stat()</code> method creates a statistical structure and copies a
pointer to it into user-specified memory locations. Specifically, if
<span class="bold"><strong>sp</strong></span> is non-NULL, a pointer to the
statistics for the database are copied into the memory location to
which it refers.
</p>
<p>
The <code class="methodname">DB-&gt;stat()</code> <span>
<span>
method returns a non-zero error value on failure and 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h3 class="title"><a id="idp58592976"></a>Parameters</h3>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
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<h4 class="title"><a id="idp58593624"></a>txnid</h4>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
If the operation is part of an application-specified transaction, the
<span class="bold"><strong>txnid</strong></span> parameter is a transaction
handle returned from <a class="xref" href="txnbegin.html" title="DB_ENV-&gt;txn_begin()">DB_ENV-&gt;txn_begin()</a>; if the
operation is part of a Berkeley DB Concurrent Data Store group, the
<span class="bold"><strong>txnid</strong></span> parameter is a handle returned
from <a class="xref" href="envcdsgroup_begin.html" title="DB_ENV-&gt;cdsgroup_begin()">DB_ENV-&gt;cdsgroup_begin()</a>;
otherwise NULL. If no transaction handle is specified, but the
operation occurs in a transactional database, the operation will be
implicitly transaction protected.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h4 class="title"><a id="idp58582800"></a>flags</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
The <span class="bold"><strong>flags</strong></span> parameter must be set to 0
or one of the following values:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p><a id="stat_DB_FAST_STAT"></a>
<code class="literal">DB_FAST_STAT</code>
</p>
<p>
Return only the values which do not require traversal of the database.
Among other things, this flag makes it possible for applications to
request key and record counts without incurring the performance
penalty of traversing the entire database.
</p>
</li>
<li>
<p><a id="stat_DB_READ_COMMITTED"></a>
<code class="literal">DB_READ_COMMITTED</code>
</p>
<p>
Database items read during a transactional call will have degree 2
isolation. This ensures the stability of the data items read during
the stat operation but permits that data to be modified or deleted by
other transactions prior to the commit of the specified transaction.
</p>
</li>
<li>
<p><a id="stat_DB_READ_UNCOMMITTED"></a>
<code class="literal">DB_READ_UNCOMMITTED</code>
</p>
<p>
Database items read during a transactional call will have degree 1
isolation, including modified but not yet committed data. Silently
ignored if the
<a class="link" href="dbopen.html#dbopen_DB_READ_UNCOMMITTED">DB_READ_UNCOMMITTED</a>
flag was not specified when the underlying database was opened.
</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h3 class="title"><a id="idp58616112"></a>Statistical Structure</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
Statistical structures are stored in allocated memory. If
application-specific allocation routines have been declared (see
<a class="xref" href="envset_alloc.html" title="DB_ENV-&gt;set_alloc()">DB_ENV-&gt;set_alloc()</a>
for more information), they are used to allocate the
memory; otherwise, the standard C library
<span class="bold"><strong>malloc</strong></span>(3) is used. The caller is
responsible for deallocating the memory. To deallocate the memory, free the
memory reference; references inside the returned memory need not be
individually freed.
</p>
<p>
If the DB_FAST_STAT flag has not been specified, the
<code class="methodname">DB-&gt;stat()</code> method will
access some of or all the pages in the database, incurring a severe
performance penalty as well as possibly flushing the underlying buffer pool.
</p>
<p>
In the presence of multiple threads or processes accessing an active
database, the information returned by DB-&gt;stat may be out-of-date.
</p>
<p>
If the database was not opened read-only and the DB_FAST_STAT flag was not
specified, the cached key and record numbers will be updated after the
statistical information has been gathered.
</p>
<p>
The <code class="methodname">DB-&gt;stat()</code> method may not be called before the
<a class="xref" href="dbopen.html" title="DB-&gt;open()">DB-&gt;open()</a>
method is called.
</p>
<p>
The <code class="methodname">DB-&gt;stat()</code> method returns
a non-zero error value on failure and 0 on success.
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h4 class="title"><a id="idp58627576"></a>Hash Statistics</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
In the case of a Hash database, the statistics are stored in a
structure of type <code class="literal">DB_HASH_STAT</code>. The following fields will be filled
in:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<code class="literal">uintmax_t hash_bfree;</code>
</p>
<p>
The number of bytes free on bucket pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_bigpages;</code>
</p>
<p>
The number of big key/data pages.
</p>
</li>
<li>
<p>
<code class="literal">uintmax_t hash_big_bfree;</code>
</p>
<p>
The number of bytes free on big item pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_buckets;</code>
</p>
<p>
The number of hash buckets. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_dup;</code>
</p>
<p>
The number of duplicate pages.
</p>
</li>
<li>
<p>
<code class="literal">uintmax_t hash_dup_free;</code>
</p>
<p>
The number of bytes free on duplicate pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_ffactor;</code>
</p>
<p>
The desired fill factor (number of items per bucket) specified at
database-creation time. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_free;</code>
</p>
<p>
The number of pages on the free list.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_magic;</code>
</p>
<p>
Magic number that identifies the file as a Hash file. Returned if
DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_metaflags;</code>
</p>
<p>
Reports internal flags. For internal use
only.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_ndata;</code>
</p>
<p>
The number of key/data pairs in the database. If DB_FAST_STAT was
specified the count will be the last saved value unless it has never
been calculated, in which case it will be 0. Returned if DB_FAST_STAT
is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_nkeys;</code>
</p>
<p>
The number of unique keys in the database. If DB_FAST_STAT was
specified the count will be the last saved value unless it has never
been calculated, in which case it will be 0. Returned if DB_FAST_STAT
is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_overflows;</code>
</p>
<p>
The number of overflow pages (overflow pages are pages that contain
items that did not fit in the main bucket page).
</p>
</li>
<li>
<p>
<code class="literal">uintmax_t hash_ovfl_free;</code>
</p>
<p>
The number of bytes free on overflow pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_pagecnt;</code>
</p>
<p>
The number of pages in the database. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_pagesize;</code>
</p>
<p>
The underlying database page (and bucket) size, in bytes. Returned if
DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t hash_version;</code>
</p>
<p>
The version of the Hash database. Returned if DB_FAST_STAT is set.
</p>
</li>
</ul>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h4 class="title"><a id="idp58632080"></a>Heap Statistics</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
In the case of a Heap database, the statistics are stored in a
structure of type <code class="literal">DB_HEAP_STAT</code>. The following fields will be filled
in:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<code class="literal">u_int32_t heap_magic;</code>
</p>
<p>
Magic number that identifies the file as a Heap file. Returned if
DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t heap_version;</code>
</p>
<p>
The version of the Heap database. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t heap_metaflags;</code>
</p>
<p>
Reports internal flags. For internal use
only.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t heap_nrecs;</code>
</p>
<p>
Reports the number of records in the Heap
database. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t heap_pagecnt;</code>
</p>
<p>
The number of pages in the database. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t heap_pagesize;</code>
</p>
<p>
The underlying database page (and bucket) size, in bytes. Returned if
DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t heap_nregions;</code>
</p>
<p>
The number of regions in the Heap database. Returned if
DB_FAST_STAT is set.
</p>
</li>
Release 5.3.21 5/11/2012
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<li>
<p>
<code class="literal">u_int32_t heap_regionsize;</code>
</p>
<p>
The number of pages in a region in the Heap database. Returned if
DB_FAST_STAT is set.
</p>
</li>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</ul>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h4 class="title"><a id="idp58633744"></a>Btree and Recno Statistics</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
In the case of a Btree or Recno database, the
statistics are stored in a structure of type
<code class="literal">DB_BTREE_STAT</code>. The following fields
will be filled in:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<code class="literal">u_int32_t bt_dup_pg;</code>
</p>
<p>
Number of database duplicate pages.
</p>
</li>
<li>
<p>
<code class="literal">uintmax_t bt_dup_pgfree;</code>
</p>
<p>
Number of bytes free in database duplicate pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_empty_pg;</code>
</p>
<p>
Number of empty database pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_free;</code>
</p>
<p>
Number of pages on the free list.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_int_pg;</code>
</p>
<p>
Number of database internal pages.
</p>
</li>
<li>
<p>
<code class="literal">uintmax_t bt_int_pgfree;</code>
</p>
<p>
Number of bytes free in database internal pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_leaf_pg;</code>
</p>
<p>
Number of database leaf pages.
</p>
</li>
<li>
<p>
<code class="literal">uintmax_t bt_leaf_pgfree;</code>
</p>
<p>
Number of bytes free in database leaf pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_levels;</code>
</p>
<p>
Number of levels in the database.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_magic;</code>
</p>
<p>
Magic number that identifies the file as a Btree database. Returned
if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_metaflags;</code>
</p>
<p>
Reports internal flags. For internal use
only.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_minkey;</code>
</p>
<p>
The minimum keys per page. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_ndata;</code>
</p>
<p>
For the Btree Access Method, the number of key/data pairs in the
database. If the DB_FAST_STAT flag is not specified, the count will
be exact. Otherwise, the count will be the last saved value unless it
has never been calculated, in which case it will be 0.
</p>
<p>
For the Recno Access Method, the number of records in the database.
If the database was configured with mutable record numbers (see
<a class="link" href="dbset_flags.html#dbset_flags_DB_RENUMBER">DB_RENUMBER</a>),
the count will be exact. Otherwise, if the DB_FAST_STAT flag is specified
the count will be exact but will include deleted and implicitly
created records; if the DB_FAST_STAT flag is not specified, the count
will be exact and will not include deleted or implicitly created
records.
</p>
<p>
Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_nkeys;</code>
</p>
<p>
For the Btree Access Method, the number of keys in the database. If
the DB_FAST_STAT flag is not specified or the database was configured
to support record numbers (see
<a class="link" href="dbset_flags.html#dbset_flags_DB_RECNUM">DB_RECNUM</a>),
the count will be exact. Otherwise, the count will be the last saved
value unless it has never been calculated, in which case it will be 0.
</p>
<p>
For the Recno Access Method, the number of records in the database.
If the database was configured with mutable record numbers (see
<a class="link" href="dbset_flags.html#dbset_flags_DB_RENUMBER">DB_RENUMBER</a>),
the count will be exact. Otherwise, if the DB_FAST_STAT flag is specified
the count will be exact but will include deleted and implicitly
created records; if the DB_FAST_STAT flag is not specified, the count
will be exact and will not include deleted or implicitly created
records.
</p>
<p>
Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_over_pg;</code>
</p>
<p>
Number of database overflow pages.
</p>
</li>
<li>
<p>
<code class="literal">uintmax_t bt_over_pgfree;</code>
</p>
<p>
Number of bytes free in database overflow pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_pagecnt;</code>
</p>
<p>
The number of pages in the database. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_pagesize;</code>
</p>
<p>
The underlying database page size, in bytes. Returned if DB_FAST_STAT
is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_re_len;</code>
</p>
<p>
The length of fixed-length records. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_re_pad;</code>
</p>
<p>
The padding byte value for fixed-length records. Returned if
DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t bt_version;</code>
</p>
<p>
The version of the Btree database. Returned if DB_FAST_STAT is set.
</p>
</li>
</ul>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h4 class="title"><a id="idp58655880"></a>Queue Statistics</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
In the case of a Queue database, the statistics are
stored in a structure of type
<code class="literal">DB_QUEUE_STAT</code>. The following fields
will be filled in:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<code class="literal">u_int32_t qs_cur_recno;</code>
</p>
<p>
Next available record number. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_extentsize;</code>
</p>
<p>
Underlying database extent size, in pages. Returned if DB_FAST_STAT
is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_first_recno;</code>
</p>
<p>
First undeleted record in the database. Returned if DB_FAST_STAT is
set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_magic;</code>
</p>
<p>
Magic number that identifies the file as a Queue file. Returned if
DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_metaflags;</code>
</p>
<p>
Reports internal flags. For internal use
only.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_nkeys;</code>
</p>
<p>
The number of records in the database. If DB_FAST_STAT was specified
the count will be the last saved value unless it has never been
calculated, in which case it will be 0. Returned if DB_FAST_STAT is
set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_ndata;</code>
</p>
<p>
The number of records in the database. If DB_FAST_STAT was specified
the count will be the last saved value unless it has never been
calculated, in which case it will be 0. Returned if DB_FAST_STAT is
set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_pages;</code>
</p>
<p>
Number of pages in the database.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_pagesize;</code>
</p>
<p>
Underlying database page size, in bytes. Returned if DB_FAST_STAT is
set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_pgfree;</code>
</p>
<p>
Number of bytes free in database pages.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_re_len;</code>
</p>
<p>
The length of the records. Returned if DB_FAST_STAT is set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_re_pad;</code>
</p>
<p>
The padding byte value for the records. Returned if DB_FAST_STAT is
set.
</p>
</li>
<li>
<p>
<code class="literal">u_int32_t qs_version;</code>
</p>
<p>
The version of the Queue file type. Returned if DB_FAST_STAT is set.
</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
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<h3 class="title"><a id="idp58661288"></a>Errors</h3>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
The <code class="methodname">DB-&gt;stat()</code> <span>
<span>
method may fail and return one of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
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<h4 class="title"><a id="idp58635360"></a> DB_REP_HANDLE_DEAD</h4>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
When a client synchronizes with the master, it is possible for committed
transactions to be rolled back. This invalidates all the database and cursor
handles opened in the replication environment. Once this occurs, an attempt to use
such a handle will
return <code class="literal">DB_REP_HANDLE_DEAD</code>.
The application will need to discard the handle and open a new one in order to
continue processing.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h4 class="title"><a id="idp58681272"></a>DB_REP_LOCKOUT</h4>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
The operation was blocked by client/master synchronization.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h4 class="title"><a id="idp58674760"></a>EINVAL</h4>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
An invalid flag value or parameter was specified.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h3 class="title"><a id="idp58642712"></a>Class</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
<a class="link" href="db.html" title="Chapter 2.  The DB Handle">DB</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.3.21 5/11/2012
2012-11-14 21:35:20 +00:00
<h3 class="title"><a id="idp58640000"></a>See Also</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
<a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>
</p>
</div>
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