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-<!--$Id: txn.so,v 11.12 2000/02/19 20:57:57 bostic Exp $-->
-<!--$Id: m4.tcl,v 11.17 2000/04/24 17:31:11 sue Exp $-->
-<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
-<!--All rights reserved.-->
-<html>
-<head>
-<title>Berkeley DB: env txn</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><i>env</i> <b>txn</b></h1>
-</td>
-<td width="1%">
-<a href="../api_tcl/tcl_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>env txn
- [-nosync]
- [-nowait]
- [-parent txnid]
- [-sync]
-</pre></h3>
-<h1>Description</h1>
-<p>The <i>env</i> <b>txn</b> command begins a transaction. The returned transaction
-handle is bound to a Tcl command of the form <b>env.txnX</b>, where X
-is an integer starting at 0 (e.g., env0.txn0 and env0.txn1). It is
-through this Tcl command that the script accesses the transaction methods.
-<p>The options are as follows:
-<p><dl compact>
-<p><dt>-nosync<dd>Do not synchronously flush the log when this transaction commits or
-prepares. This means the transaction will exhibit the ACI (atomicity,
-consistency and isolation) properties, but not D (durability), i.e.,
-database integrity will be maintained but it is possible that this
-transaction may be undone during recovery instead of being redone.
-<p>This behavior may be set for an entire Berkeley DB environment as part of
-the <b>berkdb env</b> interface.
-<p><dt>-nowait<dd>If a lock is unavailable for any Berkeley DB operation performed in the context
-of this transaction, throw a Tcl error immediately instead of blocking on
-the lock.
-<p><dt>-parent txnid<dd>Create the new transaction as a nested transaction, with the specified
-transaction indicated as its parent. Transactions may be nested to any
-level.
-<p><dt>-sync<dd>Synchronously flush the log when this transaction commits or prepares. This
-means the transaction will exhibit all of the ACID (atomicity, consistency
-and isolation and durability) properties.
-<p>This behavior is the default for Berkeley DB environments unless the
-<b>-nosync</b> option was specified to the <b>berkdb env</b> interface.
-</dl>
-<p>The <i>env</i> <b>txn</b> command returns a transaction handle on success.
-<p>In the case of error, a Tcl error is thrown.
-</tt>
-<table><tr><td><br></td><td width="1%">
-<a href="../api_tcl/tcl_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>