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<th colspan="3" align="center">Chapter 3.
Debugging Applications
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<div class="chapter" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title"><a id="debug"></a>Chapter 3.
Debugging Applications
</h2>
</div>
</div>
</div>
<div class="toc">
<p>
<b>Table of Contents</b>
</p>
<dl>
<dt>
<span class="sect1">
<a href="debug.html#debug_intro">Introduction to debugging</a>
</span>
</dt>
<dt>
<span class="sect1">
<a href="debug_compile.html">Compile-time configuration</a>
</span>
</dt>
<dt>
<span class="sect1">
<a href="debug_runtime.html">Run-time error information</a>
</span>
</dt>
<dt>
<span class="sect1">
<a href="debug_printlog.html">Reviewing Berkeley DB log files</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="debug_printlog.html#idp121880">Augmenting the Log for Debugging</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="debug_printlog.html#idp53840">Extracting Committed Transactions and Transaction Status</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="debug_printlog.html#idp41744">Extracting Transaction Histories</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="debug_printlog.html#idp154152">Extracting File Histories</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="debug_printlog.html#idp158032">Extracting Page Histories</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="debug_printlog.html#idp124648">Other log processing tools</a>
</span>
</dt>
</dl>
</dd>
</dl>
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<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="debug_intro"></a>Introduction to debugging</h2>
</div>
</div>
</div>
<p>
Because Berkeley DB is an embedded library, debugging applications that
use Berkeley DB is both harder and easier than debugging a separate
server. Debugging can be harder because when a problem arises, it is
not always readily apparent whether the problem is in the application,
is in the database library, or is a result of an unexpected interaction
between the two. Debugging can be easier because it is easier to track
down a problem when you can review a stack trace rather than
deciphering interprocess communication messages. This chapter is
intended to assist you with debugging applications and reporting bugs
to us so that we can provide you with the correct answer or fix as
quickly as possible.
</p>
<p>
When you encounter a problem, there are a few general actions you can
take:
</p>
<div class="variablelist">
<dl>
<dt>
<span class="term">Review the Berkeley DB error output:</span>
</dt>
<dd>
<p>
If an error output mechanism has been configured in the
Berkeley DB environment, additional run-time error messages
are made available to the applications. If you are not
using an environment, it is well worth modifying your
application to create one so that you can get more detailed
error messages. See
<a class="xref" href="debug_runtime.html" title="Run-time error information">Run-time error information</a>
for more information on configuring Berkeley DB to output these
error messages.
</p>
</dd>
<dt>
<span class="term">Review the options available for the <a href="../api_reference/C/envset_verbose.html" class="olink">DB_ENV->set_verbose()</a> method:</span>
</dt>
<dd>
<p>
Look to see if it offers any additional informational
and/or debugging messages that might help you understand
the problem.
</p>
</dd>
<dt>
<span class="term">Add run-time diagnostics:</span>
</dt>
<dd>
<p>
You can configure and build Berkeley DB to perform run-time
diagnostics. (By default, these checks are not done
because they can seriously impact performance.) See
<a class="xref" href="debug_compile.html" title="Compile-time configuration">Compile-time configuration</a>
for more information.
</p>
</dd>
<dt>
<span class="term">Apply all available patches:</span>
</dt>
<dd>
<p>
Before reporting a problem in Berkeley DB, please upgrade
to the latest Berkeley DB release, if possible, or at least
make sure you have applied any updates available for your
release from the
<a class="ulink" href="http://www.oracle.com/technetwork/database/berkeleydb/downloads/index.html" target="_top">
Berkeley DB web site
</a>.
</p>
</dd>
<dt>
<span class="term">Run the test suite:</span>
</dt>
<dd>
<p>
If you see repeated failures or failures of simple test
cases, run the Berkeley DB test suite to determine whether
the distribution of Berkeley DB you are using was built and
configured correctly.
</p>
</dd>
</dl>
</div>
</div>
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