<!--$Id: db_truncate.so,v 1.13 2002/08/24 15:12:02 bostic Exp $-->
<!--Copyright 1997-2002 by Sleepycat Software, Inc.-->
<!--All rights reserved.-->
<!--See the file LICENSE for redistribution information.-->
<html>
<head>
<title>Berkeley DB: DB->truncate</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 width="100%"><tr valign=top>
<td>
<h1>DB->truncate</h1>
</td>
<td align=right>
<a href="../../db4-devel-4.1.25/api_c/c_index.html"><img src="../../db4-4.1.25/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.1.25/images/ref.gif" alt="Ref"></a>
</td></tr></table>
<hr size=1 noshade>
<tt>
<h3><pre>
#include <db.h>
<p>
int
DB->truncate(DB *db,
DB_TXN *txnid, u_int32_t *countp, u_int32_t flags);
</pre></h3>
<h1>Description</h1>
<p>The DB->truncate interface empties the database, discarding all
records it contains.
The number of records discarded from the database is returned in
<b>countp</b>.
<p>If the operation is to be transaction-protected (other than by specifying
the DB_AUTO_COMMIT flag), the <b>txnid</b> parameter is a
transaction handle returned from <a href="../../db4-devel-4.1.25/api_c/txn_begin.html">DB_ENV->txn_begin</a>; otherwise, NULL.
<p>The <b>flags</b> value must be set to 0 or
the following value:
<p><dl compact>
<p><dt><a name="DB_AUTO_COMMIT">DB_AUTO_COMMIT</a><dd>Enclose the DB->truncate call within a transaction. If the call succeeds,
changes made by the operation will be recoverable. If the call fails,
the operation will have made no changes.
</dl>
<p>The DB->truncate method returns a non-zero error value on failure and 0 on success.
<h1>Errors</h1>
<p>The DB->truncate method may fail and return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>DB_LOCK_DEADLOCK<dd>The operation was selected to resolve a deadlock.
</dl>
<p>The DB->truncate method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the DB->truncate method may fail and
return <a href="../../db4-devel-4.1.25/ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../../db4-devel-4.1.25/api_c/db_class.html">DB</a>
<h1>See Also</h1>
<a href="../../db4-devel-4.1.25/api_c/db_list.html">Databases and Related Methods</a>
</tt>
<table width="100%"><tr><td><br></td><td align=right>
<a href="../../db4-devel-4.1.25/api_c/c_index.html"><img src="../../db4-4.1.25/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.1.25/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>
distrib
>
Mandriva
>
2008.1
>
x86_64
>
media
>
main-release
>
by-pkgid
>
909f302ad53a08b3685753343102c969
>
files
>
66
