RE: Finding similar statements in database for ORA-4031

From: Jo¾e Senegaènik <Joze.Senegacnik_at_snt.si>
Date: Thu, 20 Sep 2007 22:44:42 +0200
Message-ID: <76DB0765807AE840BC6CBDC7401CBA37032F1745@simail01.adriatic.snt.eu>

To find statements with identical execution plans you can group them by v$sql.plan_hash_value.

Regards, Joze

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Thotangare, Ajay (GTI) Sent: 20. september 2007 21:38
To: Nigel Thomas; oracle-l
Subject: RE: Finding similar statements in database for ORA-4031

Thanks a lot for your update

what tool is doing that horrible thing with the aliases? --Tool named PACE
you can try looking for statements that generate the same plan
(although same plan can be different text and vice versa)
--I tried this but was not getting much
but best is using regular expressions to replace Tnnnn. with T@. --This is in 10g. My database is 9i. I can always copy this table from 9i to 10g and do this but can I do this in 9i itself.

regards,
Ajay Thotangare
212-647-4312

-----Original Message-----
From: Nigel Thomas [mailto:nigel_cl_thomas_at_yahoo.com] Sent: Thursday, September 20, 2007 3:33 PM To: Thotangare, Ajay (GTI); oracle-l
Subject: Re: Finding similar statements in database for ORA-4031

Ajay

Three thoughts

what tool is doing that horrible thing with the aliases?
you can try looking for statements that generate the same plan
(although same plan can be different text and vice versa)
but best is using regular expressions to replace Tnnnn. with T@.

select REGEXP_REPLACE(SQL_TEXT, '[Tt][0-9]*\.', 't@.') transformed_sql) FROM ... eg:

C:\>sqlplus test/test
SQL*Plus: Release 10.2.0.1.0 - Production on Thu Sep 20 20:27:56 2007 Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production

SQL> select regexp_replace('t1.a t2.b t1.c t123.d','t[0-9]*\.', 't@.') from dual
2 /
REGEXP_REPLACE('T1.

t@.a t@.b t@.c t@.d
SQL> You can then group by the transformed SQL_TEXT and count the clones...

HTH Regards Nigel

Original Message ---- From: "Thotangare, Ajay (GTI)" <Ajay_Thotangare_at_ml.com>

In my database there is a big problem of shared pool getting fragmented(ORA-4031). I know its due to some sql statements not getting shared. I found some statements which are potential candidate causing fragmentation.

There are about 6000 versions of same sql not shared due to use of table aliases which makes statement different. Below is one of the example. 00000005ECD192B0 SELECT t3608.CURRENT_BUSDATE, t3608.BOM_DATE FROM deldate0 t360800000005ECD192B0 WHERE t3608.NDAY_REGION = :"SYS_B_0" 00000005ED1E0C90 SELECT t66732.CURRENT_BUSDATE, t66732.BOM_DATE FROM deldate0 t6600000005ED1E0C90 732 WHERE t66732.NDAY_REGION = :"SYS_B_0" 00000005ED5B2AE0 SELECT t110049.CURRENT_BUSDATE, t110049.BOM_DATE FROM deldate0 t00000005ED5B2AE0 110049 WHERE t110049.NDAY_REGION = :"SYS_B_0" 00000005ED6C55C0 SELECT t310076.CURRENT_BUSDATE, t310076.BOM_DATE FROM deldate0 t00000005ED6C55C0 310076 WHERE t310076.NDAY_REGION = :"SYS_B_0"

<etc>

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Received on Thu Sep 20 2007 - 15:44:42 CDT