Re: SP Non-Parse CPU Calculation IS Incorrect

From: Ed Bittel <bitlist_at_yahoo.com>
Date: Fri, 19 Oct 2001 13:39:16 -0700
Message-ID: <F001.003B081D.20011019134117@fatcity.com>

I don't know if anyone else uses Statspack, but I couldn't help but notice the incorrect '% Non Parse CPU' result in the instance efficiency section of the report.

Non-Parse CPU % calculation taken from STATSPACK 8.1.7: STATSREP.SQL:
        round(100*1-(:prscpu/:tcpu),2).

It should be:

        round(100*(1-(:prscpu/:tcpu),2)).
        

Here's an example using actual statspack values for 'CPU used by this session' and 'parse time cpu'.

select round(100*1-(23255/234162),2) pctval from dual;

    PCTVAL

---

      99.9

select round(100*(1-(23255/234162)),2) pctval from dual;

    PCTVAL

---

     90.07

So instead of .10% of CPU being used to parse as reported by Statspack, the database is actually using 10% of CPU to parse. Using the statspack calculation, my database could be using 50% of CPU to parse and the report would still report a high non-parse CPU %.

I guess it pays to remember "My Dear Aunt Sally".

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Author: Ed Bittel
  INET: bitlist_at_yahoo.com

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