X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=doc%2Frrd-beginners.pod;h=5ac79973f6d728864867c30dedb3f53289667cfe;hb=7c4039b31bcabef8f914ce245b71c43509ded6ca;hp=644f2f005eacb43d0268db2f20cf0a778f8e32b1;hpb=cb092381724e4ba8a1f18712fefc541a3d370f99;p=rrdtool.git diff --git a/doc/rrd-beginners.pod b/doc/rrd-beginners.pod index 644f2f0..5ac7997 100644 --- a/doc/rrd-beginners.pod +++ b/doc/rrd-beginners.pod @@ -58,8 +58,8 @@ data flow to update the RRDtool database. =back RRDtool is designed to store time series of data. With every data -update, an assosiated time stamp is stored. Time is always expressed -in seconds passed since epoch (01-01-1971). RRDtool can be installed +update, an associated time stamp is stored. Time is always expressed +in seconds passed since epoch (01-01-1970). RRDtool can be installed on Unix as well as Windows. It comes with a command set to carry out various operations on RRD databases. This command set can be accessed from the command line, as well as from Shell or Perl scripts. The @@ -149,7 +149,7 @@ is much better than to assume a missing value was 0 (zero) or any other number which might also be a valid data value. For example, the traffic flow counter on a router keeps increasing. Lets say, a value is missed for an interval and 0 is stored instead of UNKNOWN. Now when -hte next value becomes available, it will calculate the difference +the next value becomes available, it will calculate the difference between the current value and the previous value (0) which is not correct. So, inserting the value UNKNOWN makes much more sense here.