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Import BSDDB 4.7.25 (as of svn r89086)

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Zachary Ware
2017-09-04 13:40:25 -05:00
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<!--$Id: db_set_q_extentsize.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<html>
<head>
<title>Berkeley DB: DB-&gt;set_q_extentsize</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<table width="100%"><tr valign=top>
<td>
<b>DB-&gt;set_q_extentsize</b>
</td>
<td align=right>
<a href="../api_c/api_core.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>
<b><pre>
#include &lt;db.h&gt;
<p>
int
DB-&gt;set_q_extentsize(DB *db, u_int32_t extentsize);
<p>
int
DB-&gt;get_q_extentsize(DB *db, u_int32_t *extentsizep);
</pre></b>
<hr size=1 noshade>
<b>Description: DB-&gt;set_q_extentsize</b>
<p>Set the size of the extents used to hold pages in a Queue database,
specified as a number of pages. Each extent is created as a separate
physical file. If no extent size is set, the default behavior is to
create only a single underlying database file.</p>
<p>For information on tuning the extent size, see
<a href="../ref/am_conf/extentsize.html">Selecting a extent size</a>.</p>
<p>The DB-&gt;set_q_extentsize method configures a database, not only operations performed
using the specified <a href="../api_c/db_class.html">DB</a> handle.</p>
<p>The DB-&gt;set_q_extentsize method may not be called after the <a href="../api_c/db_open.html">DB-&gt;open</a> method is called.
If the database already exists when
<a href="../api_c/db_open.html">DB-&gt;open</a> is called, the information specified to DB-&gt;set_q_extentsize will
be ignored.
</p>
<p>The DB-&gt;set_q_extentsize method
returns a non-zero error value on failure
and 0 on success.
</p>
<b>Parameters</b> <br>
<b>extentsize</b><ul compact><li>The <b>extentsize</b> parameter is the number of pages in a Queue database
extent.</ul>
<br>
<br><b>Errors</b>
<p>The DB-&gt;set_q_extentsize method
may fail and return one of the following non-zero errors:</p>
<br>
<b>EINVAL</b><ul compact><li>If the method was called after <a href="../api_c/db_open.html">DB-&gt;open</a> was called; or if an
invalid flag value or parameter was specified.</ul>
<br>
<hr size=1 noshade>
<b>Description: DB-&gt;get_q_extentsize</b>
<p>The DB-&gt;get_q_extentsize method returns the number of pages in an extent.</p>
<p>The DB-&gt;get_q_extentsize method may be called at any time during the life of the
application.</p>
<p>The DB-&gt;get_q_extentsize method
returns a non-zero error value on failure
and 0 on success.
</p>
<b>Parameters</b> <br>
<b>extentsizep</b><ul compact><li>The DB-&gt;get_q_extentsize method returns the
number of pages in an extent in <b>extentsizep</b>.</ul>
<br>
<hr size=1 noshade>
<br><b>Class</b>
<a href="../api_c/db_class.html">DB</a>
<br><b>See Also</b>
<a href="../api_c/db_list.html">Databases and Related Methods</a>
</tt>
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</td></tr></table>
<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
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