On a light-weight test on 8.1.7.4 at 700MHz on W2000 -
About 15,000 request/release per second
if you are using an ID
About 8,000 request/release per second
if you are using a pre-allocated lock handle
About 800 request/release per second
if you have to allocate_unique on every request.
Bear in mind that each request or release will hit the
enqueue latch a couple of times, so you could get
contention for the latch in the two high-speed options.
(Forget the low-speed option, allocate_unique does a
commit in mid-stream, which you might be able to hide
with a recursive transaction - but the overheads are
extreme).
Bottom line - for high-speed OLTP type of work, I
don't think you will get away with more than a dozen
request/release cycles per transaction.
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
The educated person is not the person
who can answer the questions, but the
person who can question the answers -- T. Schick Jr
Next public appearance2:
March 2004 Hotsos Symposium - Keynote
March 2004 Charlotte NC - OUG Tutorial
April 2004 Iceland
One-day tutorials:
http://www.jlcomp.demon.co.uk/tutorial.html
Three-day seminar:
see http://www.jlcomp.demon.co.uk/seminar.html
____UK___February
The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: Wednesday, January 21, 2004 12:49 PM
> As in: does it present an inherent or hidden performance
> problem when a lot of sessions try to lock/release the same
> lock? Or how many lock/release per second. Or some other
> idea of how efficient it is?
>
> Need to use it in a design, but not sure of any potential
> performance hits or scalability issues. Any ideas?
>
> TIA.
> Cheers
> Nuno Souto
> [EMAIL PROTECTED]
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Jonathan Lewis
INET: [EMAIL PROTECTED]
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