public function flush()
	{
		$conn = $this->_dbm->acquire( $this->_dbname );

		try
		{
			$stmt = $conn->create( str_replace( ':cond', '1', $this->_sql['delete'] ) );
			$stmt->bind( 1, $this->_siteid, MW_DB_Statement_Abstract::PARAM_INT );
			$stmt->execute()->finish();

			$this->_dbm->release( $conn, $this->_dbname );
		}
		catch( Exception $e )
		{
			$this->_dbm->release( $conn, $this->_dbname );
			throw $e;
		}
	}