control: Updated standards-version to 3.9.5 -- no changes.

[pkg-rrdtool.git] / doc / rrdtutorial.pod

diff --git a/doc/rrdtutorial.pod b/doc/rrdtutorial.pod
index d6ec09d25af097cbb13ff53f7019563c94f0183c..e29cd503c081fe1225831be49a3532a8d50e5ba7 100644 (file)
--- a/doc/rrdtutorial.pod
+++ b/doc/rrdtutorial.pod
@@ -56,7 +56,7 @@ element. As we are on a circle there is neither a beginning nor an end, you can
 go on and on and on. After a while, all the available places will be used and
 the process automatically reuses old locations. This way, the dataset
 will not grow in size and therefore requires no maintenance.
 go on and on and on. After a while, all the available places will be used and
 the process automatically reuses old locations. This way, the dataset
 will not grow in size and therefore requires no maintenance.

-RRDtool works with with Round Robin Databases (RRDs). It stores and retrieves
+RRDtool works with Round Robin Databases (RRDs). It stores and retrieves

 data from them.
 
 =head2 What data can be put into an RRD?
 data from them.
 
 =head2 What data can be put into an RRD?


@@ -323,13 +323,18 @@ It should return the following output:
  920808600: 6.6666666667e-03
  920808900: 3.3333333333e-03
  920809200: nan
  920808600: 6.6666666667e-03
  920808900: 3.3333333333e-03
  920809200: nan

-
-If it doesn't, something may be wrong.  Perhaps your OS will print
-"NaN" in a different form. "NaN" stands for "Not A Number".  If your OS
-writes "U" or "UNKN" or something similar that's okay.  If something
-else is wrong, it will probably be due to an error you made (assuming
-that my tutorial is correct of course :-). In that case: delete the
-database and try again. 
+ 920809500: nan 
+
+Note that you might get more rows than you expect. The reason for this is
+that you ask for a time range that ends on 920809200. The number that is
+written behind 920809200: in the list above covers the time range from
+920808900 to 920809200, EXCLUDING 920809200. Hence to be on the sure side,
+you receive the entry from 920809200 to 920809500 as well since it INCLUDES
+920809200. You may also see "NaN" instead of "nan" this is OS dependent.
+"NaN" stands for "Not A Number".  If your OS writes "U" or "UNKN" or
+something similar that's okay.  If something else is wrong, it will probably
+be due to an error you made (assuming that my tutorial is correct of course
+:-). In that case: delete the database and try again.

 
 
 The meaning of the above output will become clear below.
 
 
 The meaning of the above output will become clear below.