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-<!--$Id: db_set_bt_prefix.so,v 10.25 2000/09/08 21:35:26 bostic Exp $-->
-<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
-<!--All rights reserved.-->
-<html>
-<head>
-<title>Berkeley DB: Db.set_bt_prefix</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>Db.set_bt_prefix</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 interface DbBtreePrefix
-{
- public abstract int bt_prefix(Db db, Dbt dbt1, Dbt dbt2);
-}
-public class Db
-{
- public void set_bt_prefix(DbBtreePrefix bt_prefix)
- throws DbException;
- ...
-}
-</pre></h3>
-<h1>Description</h1>
-<p>Set the Btree prefix function. The prefix function must return the
-number of bytes of the second key argument that would be required by
-the Btree key comparison function to determine the second key argument's
-ordering relationship with respect to the first key argument. If the
-two keys are equal, the key length should be returned. The prefix
-function must correctly handle any key values used by the application
-(possibly including zero-length keys). The <b>data</b> and
-<b>size</b> fields of the <a href="../api_java/dbt_class.html">Dbt</a> are the only fields that may be
-used for the purposes of this determination.
-<p>The prefix function is used to determine the amount by which keys stored
-on the Btree internal pages can be safely truncated without losing their
-uniqueness. See the <a href="../ref/am_conf/bt_prefix.html">Btree
-prefix comparison</a> section of the Reference Guide for more details about
-how this works. The usefulness of this is data dependent, but in some
-data sets can produce significantly reduced tree sizes and search times.
-<p>If no prefix function or key comparison function is specified by the
-application, a default lexical comparison function is used as the prefix
-function. If no prefix function is specified and a key comparison
-function is specified, no prefix function is used. It is an error to
-specify a prefix function without also specifying a key comparison
-function.
-<p>The Db.set_bt_prefix interface may only be used to configure Berkeley DB before
-the <a href="../api_java/db_open.html">Db.open</a> interface is called.
-<p>The Db.set_bt_prefix method throws an exception that encapsulates a non-zero error value on
-failure.
-<h1>Errors</h1>
-<p><dl compact>
-<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
-<p>Called after <a href="../api_java/db_open.html">Db.open</a> was called.
-</dl>
-<h3>Class</h3>
-<a href="../api_java/db_class.html">Db</a>
-<h1>See Also</h1>
-<a href="../api_java/db_close.html">Db.close</a>,
-<a href="../api_java/db_cursor.html">Db.cursor</a>,
-<a href="../api_java/db_del.html">Db.del</a>,
-<a href="../api_java/db_fd.html">Db.fd</a>,
-<a href="../api_java/db_get.html">Db.get</a>,
-<a href="../api_java/db_get_byteswapped.html">Db.get_byteswapped</a>,
-<a href="../api_java/db_get_type.html">Db.get_type</a>,
-<a href="../api_java/db_join.html">Db.join</a>,
-<a href="../api_java/db_key_range.html">Db.key_range</a>,
-<a href="../api_java/db_open.html">Db.open</a>,
-<a href="../api_java/db_put.html">Db.put</a>,
-<a href="../api_java/db_remove.html">Db.remove</a>,
-<a href="../api_java/db_set_bt_minkey.html">Db.set_bt_minkey</a>,
-<a href="../api_java/db_set_cachesize.html">Db.set_cachesize</a>,
-<a href="../api_java/db_set_errcall.html">Db.set_errcall</a>,
-<a href="../api_java/db_set_errpfx.html">Db.set_errpfx</a>,
-<a href="../api_java/db_set_flags.html">Db.set_flags</a>,
-<a href="../api_java/db_set_h_ffactor.html">Db.set_h_ffactor</a>,
-<a href="../api_java/db_set_h_nelem.html">Db.set_h_nelem</a>,
-<a href="../api_java/db_set_lorder.html">Db.set_lorder</a>,
-<a href="../api_java/db_set_pagesize.html">Db.set_pagesize</a>,
-<a href="../api_java/db_set_q_extentsize.html">Db.set_q_extentsize</a>,
-<a href="../api_java/db_set_re_delim.html">Db.set_re_delim</a>,
-<a href="../api_java/db_set_re_len.html">Db.set_re_len</a>,
-<a href="../api_java/db_set_re_pad.html">Db.set_re_pad</a>,
-<a href="../api_java/db_set_re_source.html">Db.set_re_source</a>,
-<a href="../api_java/db_stat.html">Db.stat</a>,
-<a href="../api_java/db_sync.html">Db.sync</a>,
-<a href="../api_java/db_upgrade.html">Db.upgrade</a>
-and
-<a href="../api_java/db_verify.html">Db.verify</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>