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HTML
93 lines
5.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DB_LOCK_NOTGRANTED</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Upgrade Guide" />
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<link rel="up" href="upgrade_4_2_toc.html" title="Chapter 8. Upgrading Berkeley DB 4.1 applications to Berkeley DB 4.2" />
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<link rel="prev" href="upgrade_4_2_verify.html" title="DB->verify" />
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<link rel="next" href="upgrade_4_2_repinit.html" title="Replication" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DB_LOCK_NOTGRANTED</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="upgrade_4_2_verify.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 8. Upgrading Berkeley DB 4.1 applications to Berkeley DB 4.2</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_4_2_repinit.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="upgrade_4_2_lockng"></a>DB_LOCK_NOTGRANTED</h2>
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</div>
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</div>
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</div>
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<p>
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In previous releases, configuring lock or transaction timeout values or calling the <a href="../api_reference/C/txnbegin.html" class="olink">DB_ENV->txn_begin()</a>
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method with the <a href="../api_reference/C/txnbegin.html#txnbegin_DB_TXN_NOWAIT" class="olink">DB_TXN_NOWAIT</a> flag caused database operation methods to return
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<a href="../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_NOTGRANTED" class="olink">DB_LOCK_NOTGRANTED</a>, or throw a <a href="../api_reference/CXX/dblocknotgranted.html" class="olink">DbLockNotGrantedException</a>
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exception. This required applications to unnecessarily handle multiple errors or
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exception types.
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</p>
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<p>
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In the Berkeley DB 4.2 release, with one exception, database operations will no longer return
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<a href="../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_NOTGRANTED" class="olink">DB_LOCK_NOTGRANTED</a> or throw a <a href="../api_reference/CXX/dblocknotgranted.html" class="olink">DbLockNotGrantedException</a>
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exception. Instead, database operations will return
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<a href="../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_DEADLOCK" class="olink">DB_LOCK_DEADLOCK</a> or throw a <a href="../api_reference/CXX/dbdeadlock.html" class="olink">DbDeadlockException</a>
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exception. This change should require no application changes, as applications must
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already be dealing with the possible <a href="../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_DEADLOCK" class="olink">DB_LOCK_DEADLOCK</a> error return or <a href="../api_reference/CXX/dbdeadlock.html" class="olink">DbDeadlockException</a>
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exception from database operations.
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</p>
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<p>
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The one exception to this rule is the <a href="../api_reference/C/dbget.html" class="olink">DB->get()</a> method using the <a href="../api_reference/C/dbget.html#dbget_DB_CONSUME_WAIT" class="olink">DB_CONSUME_WAIT</a> flag to consume records
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from a Queue. If lock or transaction timeouts are set, this method and flag combination may
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return <a href="../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_NOTGRANTED" class="olink">DB_LOCK_NOTGRANTED</a> or throw a <a href="../api_reference/CXX/dblocknotgranted.html" class="olink">DbLockNotGrantedException</a>
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exception.
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</p>
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<p>
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Applications wanting to distinguish between true deadlocks and timeouts can configure database
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operation methods to return <a href="../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_NOTGRANTED" class="olink">DB_LOCK_NOTGRANTED</a> or throw a <a href="../api_reference/CXX/dblocknotgranted.html" class="olink">DbLockNotGrantedException</a>
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exception using the <a href="../api_reference/C/envset_flags.html#envset_flags_DB_TIME_NOTGRANTED" class="olink">DB_TIME_NOTGRANTED</a> flag.
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</p>
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<p>
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The <a href="../api_reference/C/lockget.html" class="olink">DB_ENV->lock_get()</a> and <a href="../api_reference/C/lockvec.html" class="olink">DB_ENV->lock_vec()</a> methods will continue to return
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<a href="../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_NOTGRANTED" class="olink">DB_LOCK_NOTGRANTED</a>, or throw a <a href="../api_reference/CXX/dblocknotgranted.html" class="olink">DbLockNotGrantedException</a>
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exception as they have previously done.
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</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="upgrade_4_2_verify.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_4_2_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_4_2_repinit.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DB->verify </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Replication</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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