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4.9 KiB
HTML
84 lines
4.9 KiB
HTML
<?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>Verbose Output</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_6_toc.html" title="Chapter 4. Upgrading Berkeley DB 4.5 applications to Berkeley DB 4.6" />
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<link rel="prev" href="upgrade_4_6_full_election.html" title="DB_REP_FULL_ELECTION" />
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<link rel="next" href="upgrade_4_6_verb.html" title="DB_VERB_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">Verbose Output</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_6_full_election.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 4. Upgrading Berkeley DB 4.5 applications to Berkeley DB 4.6</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_4_6_verb.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_6_verbose"></a>Verbose Output</h2>
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</div>
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</div>
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</div>
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<p>When an error occurs in the Berkeley DB library, an exception is thrown or an
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error return value is returned by the interface. In some cases,
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however, the exception or returned value may be insufficient to
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completely describe the cause of the error, especially during initial
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application debugging. Applications can configure Berkeley DB for verbose
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messages to be output when an error occurs, but it's a common cause of
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confusion for new users that no verbose messages are available by
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default.</p>
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<p>In the Berkeley DB 4.6 release, verbose messages are configured by default.
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For the C and C++ APIs, this means the default configuration when
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applications first create <a href="../api_reference/C/db.html" class="olink">DB</a> or <a href="../api_reference/C/env.html" class="olink">DB_ENV</a> handles is as if
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the <a href="../api_reference/C/envset_errfile.html" class="olink">DB_ENV->set_errfile()</a> or <a href="../api_reference/C/dbset_errfile.html" class="olink">DB->set_errfile()</a> methods were called
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with the standard error output (stderr) specified as the FILE *
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argument. Applications wanting no output at all can turn off this
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default configuration by calling the <a href="../api_reference/C/envset_errfile.html" class="olink">DB_ENV->set_errfile()</a> or
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<a href="../api_reference/C/dbset_errfile.html" class="olink">DB->set_errfile()</a> methods with NULL as the FILE * argument.
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Additionally, explicitly configuring the error output channel using any
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of the <a href="../api_reference/C/envset_errfile.html" class="olink">DB_ENV->set_errfile()</a>, <a href="../api_reference/C/envset_errcall.html" class="olink">DB_ENV->set_errcall()</a>, <a href="../api_reference/CXX/envset_error_stream.html" class="olink">DbEnv::set_error_stream()</a> or <a href="../api_reference/CXX/dbset_error_stream.html" class="olink">Db::set_error_stream()</a>
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methods will also turn off this default output for the application.</p>
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<p>Applications which configure Berkeley DB with any error output channel should
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not require any changes.</p>
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<p>Applications which depend on having no output from the Berkeley DB library by
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default, should be changed to call the <a href="../api_reference/C/envset_errfile.html" class="olink">DB_ENV->set_errfile()</a> or
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<a href="../api_reference/C/dbset_errfile.html" class="olink">DB->set_errfile()</a> methods with NULL as the FILE * argument.</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_6_full_election.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_4_6_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_4_6_verb.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_REP_FULL_ELECTION </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"> DB_VERB_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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