RE: Increasing CPU on every execution of an anonymous block sent from WebLogic
- From: "Mark W. Farnham" <mwf@xxxxxxxx>
- To: <paul.baumgartel@xxxxxxxxxxxxxxxxx>, "'Alberto Dell'Era'" <alberto.dellera@xxxxxxxxx>
- Date: Wed, 21 Mar 2007 11:00:26 -0400
okay, I'll bite -- What else is going on in this block?
Are queries, potentially involving blocks and indexes affected by the
inserts being iteratively queried between the inserts?
Since the bind variables are constant in name, this implies they must be set
to new values either by query or new value assignment in the pl/sql code.
The former could be affected by what our friend Tom Kyte refers to as write
consistency, while the latter would still imply a full stack line turn
around to the client (that is where your pl/sql is running, right?).
Sounds to me like either possibility is the wrong way to run a railroad,
even if some bug can be discovered and fixed to make the performance within
your service level requirements.
Regards,
mwf
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Baumgartel, Paul
Sent: Wednesday, March 21, 2007 9:44 AM
To: 'Alberto Dell'Era'; Baumgartel, Paul
Cc: oracle-l@xxxxxxxxxxxxx
Subject: RE: Increasing CPU on every execution of an anonymous block sent
from WebLogic
The timings are for serial execution of the block by the same connection.
The text of the block, including bind names, is identical every time.
Paul Baumgartel
CREDIT SUISSE
Information Technology
DBA & Admin - NY, KIGA 1
One Madison Avenue
New York, NY 10010
USA
Phone 212.538.1143
paul.baumgartel@xxxxxxxxxxxxxxxxx
www.credit-suisse.com
-----Original Message-----
From: Alberto Dell'Era [mailto:alberto.dellera@xxxxxxxxx]
Sent: Tuesday, March 20, 2007 3:52 PM
To: paul.baumgartel@xxxxxxxxxxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Increasing CPU on every execution of an anonymous block sent
from WebLogic
> Analysis of the trace files for the bind-variable version reveals that
the
> CPU time to EXEC the anonymous block (and, to a lesser extent, its
> constituent INSERT statements) steadily increases. The first time
> through the CPU time is about 0.02 second. By the last execution
> before the timeout, the CPU time is just about 1.0 second.
> Interestingly, the logical I/O stats for each execution are quite low
> (<100 current reads and consistent reads) and quite consistent.
Are those timings for a serial execution of the block by the same
connection, or by concurrent execution by different connections ?
Is the block identical for bind variables names also ? ie
begin
insert ... values (:bind_one);
insert ... values (:bind_one);
end;
or
begin
insert ... values (:bind_one);
insert ... values (:bind_TWO);
end;
--
Alberto Dell'Era
"dulce bellum inexpertis"
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