RE: explain plan, can you explain this?

Andrew, AWR reports delta values, not cumulative statistics.  

It reports the delta values from the columns of dba_hist_sqlstat like buffer_gets_delta.  

Here is a part of an sql run by a 10.2 awrrpt.sql  

...

sum(disk_reads_delta) dskr, sum(executions_delta) exec,  

                      sum(cpu_time_delta) cput, sum(elapsed_time_delta)

...

from dba_hist_sqlstat

                  where dbid

      = :dbid

                    and instance_number = :inst_num

 

          and :bid            < snap_id

                    and snap_id

   <= :eid

               group by sql_id)

...  

From: Andrew Kerber [mailto:andrew.kerber_at_gmail.com] Sent: Thursday, January 10, 2008 7:57 PM To: john.kanagaraj_at_gmail.com
Cc: Yasin Baskan; dannorris_at_dannorris.com; Oracle L Subject: Re: explain plan, can you explain this?  

And then, you have to do it again for AWR. AWR does report cumulative statistics.

On Jan 10, 2008 11:36 AM, John Kanagaraj <john.kanagaraj_at_gmail.com > wrote:

> John, are you sure that statspack reports sql statistics cumulatively?

Yasin and Allen,

You are right: My bad. STATSPACK indeed does report the differences. This myth of mine was self-created, probably from early days of STATSPACK. Thank you for setting me right. This reminds me once more to re-validate everything I know.

Regards,

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DB Soft Inc
http://www.linkedin.com/in/johnkanagaraj 
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Andrew W. Kerber

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