(PECL rrd >= 0.9.0) Updates the RRD database.

(PECL rrd >= 0.9.0) Saves the RRD database query into image and returns the verbose information about generated

(PECL rrd >= 0.9.0) Gets the timestamp of the first sample from rrd file.

(PECL rrd >= 0.9.0) Gets unix timestamp of the last sample.