(PECL rrd >= 0.9.0) Creates new RRDCreator
(PECL rrd >= 0.9.0) Saves the RRD database to a file
(PECL rrd >= 0.9.0) Adds data source definition for RRD database.
(PECL rrd >= 0.9.0) Adds RRA - archive of data values for each data source.