So I'm trying to wrap my head around CouchDB stats. I'm trying to figure out
exactly what the various data values mean. For example lets say I query the
"couchdb" group for the "database_reads" metric with the range parameter of
300 (5 minutes). It returns data similar to:
'database_reads' =>
array (
'current' => 85168,
'count' => 3671,
'mean' => 23.2002179243,
'min' => 0,
'max' => 153,
'stddev' => 23.8069956677,
'description' => 'number of times a document was read from a database',
)
As I understand it this is all the data being collected for the 5 minute
interval. So with that understanding I have the following questions:
1. What exactly is 'current' & 'count'. What are each of them recording
and why is 'count' less than 'current' in my system (seems counter intuitive
to me).
2. Can the 'mean' here be interpreted as average reads per second?
3. Is there any indication of exactly where within the 5 minute interval
we are?
Another metric that I'm having trouble with is the 'request_time'. Querying
it returns data similar to:
'request_time' =>
array (
'current' => 56,
'count' => 265465,
'mean' => 7.39186333415,
'min' => 0,
'max' => 6796,
'stddev' => 39.6154036284,
'description' => 'length of a request inside CouchDB without MochiWeb',
)
1. Again, same question about exactly what the 'count' and 'current'
values mean for this metric.
2. Does the 'mean' represent the average time for a request in CouchDB in
seconds?
Thanks for the help guys, its always greatly appreciated!
larry
