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<title>Berkeley DB: DbEnv::log_printf</title>
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DbEnv::log_printf
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#include &lt;db_cxx.h&gt;

int
DbEnv::log_printf(DB_TXN *txnid, const char *fmt, ...);
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Description: DbEnv::log_printf
The DbEnv::log_printf method appends an informational message to the Berkeley DB
database environment log files.
The DbEnv::log_printf method allows applications to include information in
the database environment log files, for later review using the
<a href="../../db4-utils-4.7.25/utility/db_printlog.html">db_printlog</a> utility. This method is intended for debugging and
performance tuning.
The DbEnv::log_printf 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.

Parameters 
 txnid<ul compact><li>If the logged message refers to an application-specified transaction,
the txnid parameter is a transaction handle returned from
<a href="../../db4-devel-4.7.25/api_cxx/txn_begin.html">DbEnv::txn_begin</a>; otherwise NULL.</ul>
 fmt<ul compact><li>A format string that specifies how subsequent arguments (or arguments
accessed via the variable-length argument facilities of stdarg(3)) are
converted for output. The format string may contain any formatting
directives supported by the underlying C library vsnprintf(3)
function.</ul>
 
 Errors
The DbEnv::log_printf method
may fail and throw
<a href="../../db4-devel-4.7.25/api_cxx/except_class.html">DbException</a>,
encapsulating one of the following non-zero errors, or return one of
the following non-zero errors:
 
EINVAL<ul compact><li>An
invalid flag value or parameter was specified.</ul>
 
<hr size=1 noshade>
 Class
<a href="../../db4-devel-4.7.25/api_cxx/env_class.html">DbEnv</a>, <a href="../../db4-devel-4.7.25/api_cxx/logc_class.html">DbLogc</a>, <a href="../../db4-devel-4.7.25/api_cxx/lsn_class.html">DbLsn</a>
 See Also
<a href="../../db4-devel-4.7.25/api_cxx/log_list.html">Logging Subsystem and Related Methods</a>
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