Thanks Anita
-----Original Message-----
From: A. Bardeen [mailto:abardeen1_at_yahoo.com]
Sent: Saturday, June 16, 2001 5:25 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: primary/ foreign key constraints for oltp,
overhead?...soluti
Amar,
That's the whole point Jared was trying to make: your
locking issue is because you *don't* have indexes on
your foreign keys.
You might want to review the following notes:
11828.1 " FOREIGN KEYS, INDEXES AND PARENT TABLE
LOCKING"
33453.1 "(V7) REFERENTIAL INTEGRITY AND LOCKING"
38373.1 "TECH: Example Table Locks During Referential
Integrity Enforcement"
61552.1 "DIAGNOSING DATABASE HANGING ISSUES"
15476.1 "Detecting and Resolving Locking Conflicts"
HTH,
- Anita
- Amar Kumar Padhi <TS2017_at_emirates.com> wrote:
> No indexes on foreign key.
> still the same result.
>
> rgds
> amar
>
> -----Original Message-----
> Sent: Monday, June 11, 2001 2:05 PM
> To: Multiple recipients of list ORACLE-L
> overhead?...soluti
>
>
> Jared has a point. Is there an index on the foreign
> key?
>
> Another minor detail: You should of course never
> update a primary key
> column, of
> course :-)
>
> Amar Kumar Padhi wrote:
>
> > Jared,
> > I tried again and got the same result.
> > on oracle 8.1.7 (RBO).
> >
> > session1 : delete from emp where deptno = 10;
> >
> > session2 : delete from dept where deptno = 30;
> > session 2 hanged and waited till transaction in
> session one was committed.
> >
> > the max_trans on both tab is set to 255, incase
> this raises doubt.
> > are you getting a different result? Is the FK
> present on the detail table
> > you are trying with?
> >
> > rgds
> > amar
> >
> > -----Original Message-----
> > Sent: Monday, June 11, 2001 10:25 AM
> > To: Multiple recipients of list ORACLE-L
> > overhead?...soluti
> >
> > On Sunday 10 June 2001 21:50, Amar Kumar Padhi
> wrote:
> > > - locks
> > > Oracle generates internal locks on dict tables
> to maintain the data
> > > integrity.
> > > e.g.: I deleted a record from detail table in
> one session. In another
> > > session I tried to delete a master record not
> related to the deleted
> > detail
> > > record. The 2nd session hanged. There were
> row-exclusive locks present
> on
> > > the detail table and an exclusive lock present
> on an internal table (I
> > > couldn't access). The same is the case with
> update.
> > >
> > > Oracle locks both the master & detail table
> records when the master
> record
> > > is deleted and the foreign key is created with
> on delete cascade option.
> > >
> > > Bottomline, Oracle doesn't allow altering of
> master table primary key
> when
> > > active transactions exists on detail table.
> Oracle will allow update of
> > > columns other than the primary key.
> >
> > You should probably test this scenario, as it
> works fine for me.
> >
> > Delete the a child detail row.
> > Delete an unrelated parent row, with delete
> cascade on the child table.
> >
> > Works fine.
> >
> > Possibly are missing an index? Some of these
> rules have changed I know,
> > but I'll let you look up the details.
> >
> > Bottom line, it does work.
> >
> > Jared
> > --
> > Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> > --
> > Author: Jared Still
> > INET: jkstill_at_cybcon.com
> >
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> > Author: Amar Kumar Padhi
> > INET: TS2017_at_emirates.com
> >
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> --
> Venlig hilsen
>
> Mogens Nørgaard
>
> Technical Director
> Miracle A/S, Denmark
> Web: http://MiracleAS.dk
> Mobile: +45 2527 7100
>
>
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> Author: Mogens =?iso-8859-1?Q?N=F8rgaard?=
> INET: mno_at_MiracleAS.dk
>
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> --
> Author: Amar Kumar Padhi
> INET: TS2017_at_emirates.com
>
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: A. Bardeen
INET: abardeen1_at_yahoo.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
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Received on Sun Jun 17 2001 - 04:53:10 CDT
