Query on Number of Parses and Executions(for Selects from Views)
- From: <k.sriramkumar@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 6 Apr 2004 11:53:13 +0530
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
1. This SQL is executed from PL/SQL and the query static in nature
2. Oracle version is 9.2.0.4
3. This query would be executed say 2000 times for various values of col1,col2
4. 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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