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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<title>DbEnv::log_verify()</title>
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<div class="libver">
<p>Library Version 11.2.5.3</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">DbEnv::log_verify()</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="envget_verbose.html">Prev</a> </td>
<th width="60%" align="center">Chapter 5.
The DbEnv Handle
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<hr />
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="envlog_verify"></a>DbEnv::log_verify()</h2>
</div>
</div>
</div>
<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::log_verify(DB_ENV *dbenv, const DB_LOG_VERIFY_CONFIG *config);
</pre>
<p>
The <code class="methodname">DbEnv::log_verify()</code> method verifies the integrity
of the log records of an environment and writes both error
and normal messages to the error/message output facility of the database environment handle.
</p>
<p>
The <code class="methodname">DbEnv::log_verify()</code> method does not perform the
locking function, even in Berkeley DB environments that are configured with a
locking subsystem. Because this function does not access any database files, you can call it even when the environment has other threads of control
attached and running.
</p>
<p>
The <code class="methodname">DbEnv::log_verify()</code> method returns DB_LOG_VERIFY_BAD when either log errors
are detected or the internal data storage layer does not work.
It returns EINVAL if you specify wrong configurations.
Unless otherwise specified, the <code class="methodname">DbEnv::log_verify()</code>
<span>
<span>
method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6964880"></a>Parameters</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6980016"></a>config </h4>
</div>
</div>
</div>
<p>
The configuration parameter of type DB_LOG_VERIFY_CONFIG is for the verification of log files.
A struct variable of this type must be memset to 0 before setting any configurations to it.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6983984"></a>DB_LOG_VERIFY_CONFIG members</h3>
</div>
</div>
</div>
<pre class="programlisting">
struct __db_logvrfy_config {
int continue_after_fail, verbose;
u_int32_t cachesize;
const char *temp_envhome;
const char *dbfile, *dbname;
DB_LSN start_lsn, end_lsn;
time_t start_time, end_time;
};
</pre>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6984880"></a>continue_after_fail</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>continue_after_fail</strong></span> parameter specifies whether or not continue the verification process when an error in the log is detected.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6966824"></a>verbose</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>verbose</strong></span> parameter specifies whether or not to display verbose output during the verification process.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6939944"></a>cachesize</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>cachesize</strong></span> parameter specifies the size of the cache of the temporary internal environment in bytes.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6959016"></a> temp_envhome</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>temp_envhome</strong></span> parameter is the home directory of the temporary database environment that is used internally during the verification. It can be NULL, meaning the environment and all databases are in-memory.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6951208"></a>dbfile</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>dbfile</strong></span> parameter specifies that for log records involving a database file, only those related to this database file are verified. Log records not involving database files are verified regardless of this parameter.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6957744"></a>dbname</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>dbname</strong></span> parameter specifies that for log records involving a database file, only those related to this database file are verified. Log records not involving database files are verified regardless of this parameter.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6990608"></a>start_lsn and end_lsn </h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>start_lsn</strong></span>
and <span class="bold"><strong>end_lsn </strong></span> parameters specify the range of log records from the entire log set, that must be verified. Either of them can be [0][0], to specify an open ended range. If both of them are [0][0] (by default) the entire log is verified.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6992536"></a>start_time and end_time </h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>start_time</strong></span>
and <span class="bold"><strong>end_time </strong></span>
parameters specify range of log records from the entire log set that must be verified for a time range. Either of them can be 0, to specify an open ended range. If both of them are 0 (by default), the entire log is verified.
</p>
<p>
Note that the time range specified is not precise, because such a time range is converted to an lsn range based on the time points we know from transaction commits and checkpoints.
</p>
<p>
You can specify either an lsn range or a time range. You can neither specify both nor specify an lsn and a time as a range.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6993872"></a>Environment Variables</h3>
</div>
</div>
</div>
<p>
If the database is opened within a database environment, the
environment variable <code class="literal">DB_HOME</code> can be used as the path of the
database environment home.
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6994728"></a>Errors</h3>
</div>
</div>
</div>
<p>
The <code class="methodname">DbEnv::log_verify()</code> <span>
<span>
method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
</span>
</span>
</p>
<p>EINVAL or DB_LOG_VERIFY_BAD.</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6998200"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6963296"></a>See Also</h3>
</div>
</div>
</div>
<p>
<a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a>
</p>
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</tr>
<tr>
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