diff --git a/doc/rrd-beginners.txt b/doc/rrd-beginners.txt
index 474912a99bfd1c14366262532a59bbc33fcebdd8..545ebb95b28246827384ee2845e9fa5d0e0cde48 100644 (file)
--- a/doc/rrd-beginners.txt
+++ b/doc/rrd-beginners.txt
database, there are distinct differences between RRDtool databases and
other databases as listed below:
- · RRDtool stores data; that makes it a back-end tool. The RRDtool
+ · RRDtool stores data; that makes it a back-end tool. The RRDtool
command set allows the creation of graphs; that makes it a front-
end tool as well. Other databases just store data and can not
create graphs.
- · In case of linear databases, new data gets appended at the bottom
+ · In case of linear databases, new data gets appended at the bottom
of the database table. Thus its size keeps on increasing, whereas
the size of an RRDtool database is determined at creation time.
Imagine an RRDtool database as the perimeter of a circle. Data is
RRDtool database always remains constant. The name "Round Robin"
stems from this behavior.
- · Other databases store the values as supplied. RRDtool can be
+ · Other databases store the values as supplied. RRDtool can be
configured to calculate the rate of change from the previous to the
current value and store this information instead.
- · Other databases get updated when values are supplied. The RRDtool
+ · Other databases get updated when values are supplied. The RRDtool
database is structured in such a way that it needs data at
predefined time intervals. If it does not get a new value during
the interval, it stores an UNKNOWN value for that interval. So,
(\b(P\bPD\bDP\bP)\b). In our example mentioned above, a new PDP is generated every 300
seconds.
- Note, that if you do NOT supply new datapoints exactly every 300
+ Note, that if you do NOT supply new data points exactly every 300
seconds, this is not a problem, RRDtool will interpolate the data
accordingly.
value is greater than 0). Traffic counters on a router are an ideal
candidate for using COUNTER as DST. DERIVE is the same as COUNTER, but
it allows negative values as well. If you want to see the rate of
- _\bc_\bh_\ba_\bn_\bg_\be in free diskspace on your server, then you might want to use the
- DERIVE data type. ABSOLUTE also saves the rate of change, but it
+ _\bc_\bh_\ba_\bn_\bg_\be in free disk space on your server, then you might want to use
+ the DERIVE data type. ABSOLUTE also saves the rate of change, but it
assumes that the previous value is set to 0. The difference between the
current and the previous value is always equal to the current value.
Thus it just stores the current value divided by the step interval (300
-1.3.999 2009-09-24 RRD-BEGINNERS(1)
+1.4.8 2013-05-23 RRD-BEGINNERS(1)