Another strange query

hi,
the call:
patient = (PPatient)pm.getObjectById(patientId, true);
yields to the following sql statement:
SELECT COUNT(*) FROM PPATIENT, PPATIENT t0 WHERE t0.OID = ?
this is a dramatically performance problem for us.
the patientId is an id returned by
pm.getObjectId(patient);
then
commit;
and then getObjectById
the above call behaves the same with or with or without an active
transaction!
thanks in advance
matthias.stephan

Matthias & Tibor-
Good catch. You are right: the SQL we are issuing is sub-optimal. I've
made a bug report for this at:
http://bugzilla.solarmetric.com/show_bug.cgi?id=613
You can expect it to be fixed in the near future.
In article <[email protected]>, Tibor Varga wrote:
Hi,
This is something I was also pondering about. Can you explain why the
query performed by Kodo is faster than this one:
SELECT COUNT(*) FROM PPATIENT t0 WHERE t0.OID = ?
This one does not count the number of rows in the given table, it either
gives you 1 or 0, depending on the existence of the sought record.
I feel I'm missing something tricky here. Thank you,
Tibor
Marc Prud'hommeaux wrote:
Matthias,
Passing the "true" argument to PersistenceManager.getObjectById
indicates that the JDO system must verify that the object exists in the
datastore. Thus, Kodo is performing the validation in as fast a way as
it can.
If you do not want datastore-side validation, and instead just want to
grab the object from the cache, then pass "false" as the second
argument.
See also:
http://www.solarmetric.com/javadoc/jdo/javax/jdo/PersistenceManager.html#getObjectById(java.lang.Object,%20boolean)
In article <b59hmm$dai$[email protected]>, Matthias Stephan wrote:
hi,
the call:
patient = (PPatient)pm.getObjectById(patientId, true);
yields to the following sql statement:
SELECT COUNT(*) FROM PPATIENT, PPATIENT t0 WHERE t0.OID = ?
this is a dramatically performance problem for us.
the patientId is an id returned by
pm.getObjectId(patient);
then
commit;
and then getObjectById
the above call behaves the same with or with or without an active
transaction!
thanks in advance
matthias.stephan
Marc Prud'hommeaux [email protected]
SolarMetric Inc. http://www.solarmetric.com

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Artur,
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Edited by: Herick on Dec 29, 2009 2:34 AM
Edit2: Forget what I said. I use the "Select count" and the resultSet came with just one result, so can't be memory problem.
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With the Partitioning, Oracle Label Security, OLAP and Oracle Data Mining options
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Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Oracle Data Mining options
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[\CODE]
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Edited by: xaeryan on May 20, 2011 3:02 PM

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http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
-------------------------------------------------------------------

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Thanks,
Gerard

I may have written this down wrong - sorry about that. On one sticky note, I wrote down:
mDNSResponderHEL
And on another, I wrote down:
mDNSResponderECH
I don't know which one it was now! At any rate, is anyone familiar with either of these?
Thanks and sorry for the mix-up, just too much on the go these days...
Gerard

Another strange query

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