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<h1>Db::set_bt_minkey</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
Db::set_bt_minkey(u_int32_t bt_minkey);
</pre></h3>
<h1>Description</h1>
<p>Set the minimum number of key/data pairs intended to be stored on any
single Btree leaf page.
<p>This value is used to determine if key or data items will be stored on
overflow pages instead of Btree leaf pages. For more information on
the specific algorithm used, see <a href="../ref/am_conf/bt_minkey.html">Minimum keys per page</a>. The <b>bt_minkey</b> value specified must
be at least 2; if <b>bt_minkey</b> is not explicitly set, a value of
2 is used.
<p>The Db::set_bt_minkey method configures a database, not only operations performed
using the specified <a href="../api_cxx/db_class.html">Db</a> handle.
<p>The Db::set_bt_minkey interface may not be called after the <a href="../api_cxx/db_open.html">Db::open</a>
interface is called.
If the database already exists when
<a href="../api_cxx/db_open.html">Db::open</a> is called, the information specified to Db::set_bt_minkey will
be ignored.
<p>The Db::set_bt_minkey method either returns a non-zero error value or throws an exception that
encapsulates a non-zero error value on failure, and returns 0 on success.
<h1>Errors</h1>
<p>The Db::set_bt_minkey method may fail and throw an exception or return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>Called after <a href="../api_cxx/db_open.html">Db::open</a> was called.
</dl>
<p>The Db::set_bt_minkey method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the Db::set_bt_minkey method may fail and
either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_cxx/db_class.html">Db</a>
<h1>See Also</h1>
<a href="../api_cxx/db_list.html">Databases and Related Methods</a>
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