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<h1>DbEnv::dbremove</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbEnv::dbremove(DbTxn *txnid,
const char *file, const char *database, u_int32_t flags);
</pre></h3>
<h1>Description</h1>
<p>The DbEnv::dbremove method removes the database specified by the
<b>file</b> and <b>database</b> arguments. If no <b>database</b> is
specified, the underlying file represented by <b>file</b> is removed,
incidentally removing all databases that it contained.
<p>Applications should never remove databases with open <a href="../api_cxx/db_class.html">Db</a> handles,
or in the case of removing a file, when any database in the file has an
open handle. For example, some architectures do not permit the removal
of files with open system handles. On these architectures, attempts to
remove databases currently in use by any thread of control in the system
will fail.
<p>If the operation is to be transaction-protected, the <b>txnid</b>
parameter is a transaction handle returned from <a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a>;
otherwise, NULL.
<p>The <b>flags</b> value must be set to 0 or
the following value:
<p><dl compact>
<p><dt><a name="DB_AUTO_COMMIT">DB_AUTO_COMMIT</a><dd>Enclose the DbEnv::dbremove call within a transaction. If the call succeeds,
changes made by the operation will be recoverable. If the call fails,
the operation will have made no changes.
</dl>
<p>The DbEnv::dbremove 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.
<h1>Environment Variables</h1>
<p><dl compact>
<p><dt>DB_HOME<dd>The
environment variable <b>DB_HOME</b> may be used as the path of the
database environment home.
<p>DbEnv::dbremove is affected by any database directory specified using the
<a href="../api_cxx/env_set_data_dir.html">DbEnv::set_data_dir</a> method, or by setting the "set_data_dir" string
in the environment's <b>DB_CONFIG</b> file.
</dl>
<h1>Errors</h1>
<p>The DbEnv::dbremove method may fail and throw an exception or return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>A database in the file is currently open.
<p>Called before <a href="../api_cxx/env_open.html">DbEnv::open</a> was called.
</dl>
<p>If the file or directory does not exist, the DbEnv::dbremove method will
fail and
and either return ENOENT or
throw a FileNotFoundException exception.
<p>The DbEnv::dbremove method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv::dbremove method may fail and
either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_cxx/env_class.html">DbEnv</a>
<h1>See Also</h1>
<a href="../api_cxx/env_list.html">Database Environments and Related Methods</a>
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