Query on Number of Parses and Executions(for Selects from Views)

From: <k.sriramkumar_at_iflexsolutions.com>
Date: Tue, 6 Apr 2004 11:53:13 +0530
Message-ID: <10898BE7CA96D611988B000802255AAF05CBCB9C@fmgrt>

Hi Guru's

I have a query like this

  select <column_name list>,rowid
  from <view>
  where col1=:b1 and col2 =:b2 and col3='N'   order by col5

This SQL is executed from PL/SQL and the query static in nature
Oracle version is 9.2.0.4
This query would be executed say 2000 times for various values of col1,col2
I traced the session and tkprof output shows that number of parses and executes are 2079.

call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------

Parse     2079    216.92     233.07          0          0          0           0
Execute   2079      0.33       0.43          0          0          0           0
Fetch     5297      1.54       2.71        233      11929          0        3218


------- ------  -------- ---------- ---------- ---------- ----------  ----------

total     9455    218.79     236.21        233      11929          0        3218

I expected that this statement to be parsed once and executed 2079 times. why is it getting parsed 2079 times?.

Also,

Misses in library cache during parse: 1

which means that the statement was not found in the library cache only once...

My initial guess was that the optimizer was rewriting the query but checked query_rewrite_enabled=false...The optimizer mode is RULE...would not be able to change the optimizer_mode for now

Would be great if you could throw some light on this please.

Best Regards

Sriram Kumar

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Received on Tue Apr 06 2004 - 01:17:46 CDT