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71 lines
3.4 KiB
HTML
<!--$Id: env_set_tx_max.so,v 10.21 2000/05/20 16:29:12 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: DbEnv::set_tx_max</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>DbEnv::set_tx_max</h1>
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</td>
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<td width="1%">
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<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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#include <db_cxx.h>
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<p>
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int
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DbEnv::set_tx_max(u_int32_t tx_max);
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</pre></h3>
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<h1>Description</h1>
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<p>Set the maximum number of active transactions that are supported by the
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environment. This value bounds the size of backing shared memory regions.
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Note that child transactions must be counted as active until their
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ultimate parent commits or aborts.
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<p>When there are more than the specified number of concurrent transactions,
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calls to <a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a> will fail (until some active transactions
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complete). If no value is specified, a default value of 20 is used.
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<p>The DbEnv::set_tx_max interface may only be used to configure Berkeley DB before
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the <a href="../api_cxx/env_open.html">DbEnv::open</a> interface is called.
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<p>The DbEnv::set_tx_max method either returns a non-zero error value or throws an exception that
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encapsulates a non-zero error value on failure, and returns 0 on success.
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<p>The database environment's maximum number of active transactions may also be set using the environment's
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<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
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single line with the string "set_tx_max", one or more whitespace characters,
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and the number of transactions. Because the <b>DB_CONFIG</b> file is read when the database
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environment is opened, it will silently overrule configuration done
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before that time.
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<h1>Errors</h1>
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<p><dl compact>
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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<p>Called after <a href="../api_cxx/env_open.html">DbEnv::open</a> was called.
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</dl>
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<h3>Classes</h3>
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<a href="../api_cxx/dbenv_class.html">DbEnv</a>, <a href="../api_cxx/txn_class.html">DbTxn</a>
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<h1>See Also</h1>
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<a href="../api_cxx/env_set_tx_max.html">DbEnv::set_tx_max</a>,
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<a href="../api_cxx/env_set_tx_recover.html">DbEnv::set_tx_recover</a>,
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<a href="../api_cxx/env_set_tx_timestamp.html">DbEnv::set_tx_timestamp</a>,
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<a href="../api_cxx/txn_abort.html">DbTxn::abort</a>,
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<a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a>,
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<a href="../api_cxx/txn_checkpoint.html">DbEnv::txn_checkpoint</a>,
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<a href="../api_cxx/txn_commit.html">DbTxn::commit</a>,
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<a href="../api_cxx/txn_id.html">DbTxn::id</a>,
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<a href="../api_cxx/txn_prepare.html">DbTxn::prepare</a>
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and
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<a href="../api_cxx/txn_stat.html">DbEnv::txn_stat</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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