On Friday 12 December 2008, Brand, Thomas R. wrote:
Hi all,
I have set up a 'mysql' status check as an external script:
~hobbit/client/ext/bb-mysqlstatus.sh
It sends up several informational lines (see below), only some of which
I want to graph.
I only want to graph "Threads", "Slow queries", and "Open Tables".
If I only send up the 3 lines I want to graph, everything works as
desired. However, if I add more lines, the graph stops working. I'm
guessing that I need to add something somewhere to tell RRD to ignore
the lines I don't want to graph... but where/how?
If an rrd is created, the number of counters is fixed. So, if you initally used 3 counters, the rrd is for these 3 counters. If you later send on a status message with 5 counters, the rrd will not be updated because it does not match.
I have a script to add a DS to an existing rrd. An other option is throw away the existing rrd.
So, never change the number of counters in a rrd. Or the name of the counters.
Stef