Re: Sampling V$SESSTAT

From: Connor McDonald <hamcdc_at_yahoo.co.uk>
Date: Thu, 05 Sep 2002 00:58:17 -0800
Message-ID: <F001.004C829A.20020905005817@fatcity.com>

How about this for a strategy? I'm only suggesting this because its what I implemented on a site some time back where the requirement was "we want to get stats, but you cannot store anything on our database" (so statspack et al was prohibited).

So we ended up with a "stealth" storage approach:

We dumped into a database pipe (one row from v$sesstat = one message) the non-zero stats. Then every 'x' mins, we read back from the pipe, spit out anything that has a positive delta from the current v$sesstat, and store the current set back into the pipe. In this way, we got "close" to reasonable stats, the shortfalls being a few data inconsistencies with sid's that get reused across sampling periods. The pipe also nicely handles the db shutdown issue (simply because the pipe disappears so you counters get automatically reset)

hth
connor

• "MacGregor, Ian A." <ian_at_SLAC.Stanford.EDU> wrote: > I want to start sampling this table, however
  > collecting data on the 200+ statistics for each
  > session would produce a prohibitively large result.
  > I'm trying to pare the 225 statistics to something
  > more reasonable, but I cannot decide which ones to
  > discard and which to record.
  >
  > Does anyone have a listing of the most useful
  > statistics that they would like to share?
  >
  > Ian MacGregor
  > Stanford Linear Accelerator Center
  > ian_at_SLAC.Stanford.edu
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  > Author: MacGregor, Ian A.
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Connor McDonald
http://www.oracledba.co.uk
http://www.oaktable.net

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Received on Thu Sep 05 2002 - 03:58:17 CDT