1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
<!--$Id: env_set_tx_max.so,v 10.21 2000/05/20 16:29:12 bostic Exp $-->
<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
<!--All rights reserved.-->
<html>
<head>
<title>Berkeley DB: DbEnv.set_tx_max</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>DbEnv.set_tx_max</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 void set_tx_max(int tx_max)
throws DbException;
</pre></h3>
<h1>Description</h1>
<p>Set the maximum number of active transactions that are supported by the
environment. This value bounds the size of backing shared memory regions.
Note that child transactions must be counted as active until their
ultimate parent commits or aborts.
<p>When there are more than the specified number of concurrent transactions,
calls to <a href="../api_java/txn_begin.html">DbEnv.txn_begin</a> will fail (until some active transactions
complete). If no value is specified, a default value of 20 is used.
<p>The DbEnv.set_tx_max interface may only be used to configure Berkeley DB before
the <a href="../api_java/env_open.html">DbEnv.open</a> interface is called.
<p>The DbEnv.set_tx_max method throws an exception that encapsulates a non-zero error value on
failure.
<p>The database environment's maximum number of active transactions may also be set using the environment's
<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
single line with the string "set_tx_max", one or more whitespace characters,
and the number of transactions. Because the <b>DB_CONFIG</b> file is read when the database
environment is opened, it will silently overrule configuration done
before that time.
<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/env_open.html">DbEnv.open</a> was called.
</dl>
<h3>Classes</h3>
<a href="../api_java/dbenv_class.html">DbEnv</a>, <a href="../api_java/txn_class.html">DbTxn</a>
<h1>See Also</h1>
<a href="../api_java/env_set_tx_max.html">DbEnv.set_tx_max</a>,
<a href="../api_java/env_set_tx_timestamp.html">DbEnv.set_tx_timestamp</a>,
<a href="../api_java/txn_abort.html">DbTxn.abort</a>,
<a href="../api_java/txn_begin.html">DbEnv.txn_begin</a>,
<a href="../api_java/txn_checkpoint.html">DbEnv.txn_checkpoint</a>,
<a href="../api_java/txn_commit.html">DbTxn.commit</a>,
<a href="../api_java/txn_id.html">DbTxn.id</a>,
<a href="../api_java/txn_prepare.html">DbTxn.prepare</a>
and
<a href="../api_java/txn_stat.html">DbEnv.txn_stat</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>
|
