The remaining elements of the argument are DS updates. The order of this list is
the same as the order the data sources were defined in the RRA.
If there is no data for a certain data-source, the letter
-B<U> (eg. N:0.1:U:1) can be defined.
+B<U> (e.g., N:0.1:U:1) can be defined.
The format of the value acquired from the data source is dependent of the
data source type chosen. Normally it will be numeric, but the data acquisition
Update the database file demo1.rrd with 3 known and one I<*UNKNOWN*>
value. Use the current time as the update time.
-C<rrdtool update demo2.rrd 887457267:U 887457521:22 88745790:2.7>
+C<rrdtool update demo2.rrd 887457267:U 887457521:22 887457903:2.7>
Update the database file demo2.rrd which expects data from a single
data-source, three times. First with an I<*UNKNOWN*> value then with two