Re: Data in STATSPACK report doesn’t match (V$SQL: BUFFER_GETS, CPU_TIME; V$SYSSTAT).

Hi,

I think the rule to determine if a statement is recursive or not should be 
determined by if a statement is called from other statement. If's it's called 
from other statement, it's definitely recursive even if it's PL/SQL or SQL. Top 
parent statements always run in user mode even if it's PL/SQL or SQL. For 
example, outer PL/SQL block runs in user mode. But, the SQLs and PL/SQLs called 
from outer PL/SQL runs in recursive mode.

The most importing here is that many statistics of recursive statements are 
included in their parent statements. So, If you still use V$ for your SQLs, be 
careful. They are cumulative. If you want to return exclusive statistics of 
your statement, you should use event10046 trace files with proper parser.

best regards...

http://www.ubTools.com
Web Based Oracle Products and Services

  ----- Original Message ----- 
  From: J.Velikanovs@xxxxxxxx 
  To: oracle-l@xxxxxxxxxxxxx 
  Sent: Friday, June 18, 2004 10:26 AM
  Subject: Re: Data in STATSPACK report doesn’t match (V$SQL: BUFFER_GETS, 
CPU_TIME; V$SYSSTAT).



  Thank you Zhu for pointing me, 

  This explains issue. 
  Taking in account that 60% of CPU usage is Recursive then the figures I 
mentioned can be true. 

  One comment on that: "resources reported for PL/SQL includes the resources 
used by all SQL statements called within the PL/SQL code." In my case I haven’t 
PL/SQL blocks in report, just SQL run from JDBC driver. Comment: not only 
PL/SQL can generate recursive statements, in regular SQL this can happen quite 
frequently. 

  Jurijs



       zhu chao <zhuchao@xxxxxxxxx> 
        Sent by: oracle-l-bounce@xxxxxxxxxxxxx 
        18.06.2004 05:43 
        Please respond to oracle-l 
               
                To:        oracle-l@xxxxxxxxxxxxx 
                cc:         
                Subject:        Re: Data in STATSPACK report doesn’t match 
(V$SQL: BUFFER_GETS, CPU_TIME; V$SYSSTAT). 



  It can be possible.
  Pay attention to the sentence in the statspack report:

  -> Note that resources reported for PL/SQL includes the resources used by
    all SQL statements called within the PL/SQL code.  As individual SQL
    statements are also reported, it is possible and valid for the summed
    total % to exceed 100



  ----- Original Message -----
  From: j.velikanovs@xxxxxxxx <j.velikanovs@xxxxxxxx>
  Date: Thu, 17 Jun 2004 23:47:22 +0300
  Subject: Data in STATSPACK report
  doesn't match (V$SQL: BUFFER_GETS, CPU_TIME; V$SYSSTAT).
  To: oracle-l@xxxxxxxxxxxxx






  -- 
  Regards
  Zhu Chao
  www.cnoug.org
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