Return-Path: Received: from newsfeed.cts.com (newsfeed.cts.com [209.68.248.164]) by naude.co.za (8.11.2/8.11.2) with SMTP id g7MK1dt30169 for ; Thu, 22 Aug 2002 16:01:39 -0400 Received: from fatcity.UUCP (uucp@localhost) by newsfeed.cts.com (8.9.3/8.9.3) with UUCP id MAA39238; Thu, 22 Aug 2002 12:58:59 -0700 (PDT) Received: by fatcity.com (26-Feb-2001/v1.0g-b72/bab) via UUCP id 004BD7F6; Thu, 22 Aug 2002 12:56:13 -0800 Message-ID: Date: Thu, 22 Aug 2002 12:56:13 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: Richard Huntley Sender: root@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: Richard Huntley Subject: RE: Avoding Mutation of Table trigger Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 72; ListGuru (c) 1996-2001 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPartTM-000-461cd080-b5e3-11d6-8b11-00b0d04949c1" ------=_NextPartTM-000-461cd080-b5e3-11d6-8b11-00b0d04949c1 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C24A14.4527E900" ------_=_NextPart_001_01C24A14.4527E900 Content-Type: text/plain; charset="iso-8859-1" Naba, The solution for ORA-4091 is to create two triggers--a row level (before insert or update) and a statement level (after insert or update). In the row level you simply record the values of :new.AMT into a PL/SQL table. Then in the statement level trigger you perform the calculation based on the recorded values in the PL/SQL table. Record the values using a PL/SQL table in a "package", that way you won't have to worry about simultaneous updates by different sessions. HTH, Rich -----Original Message----- Sent: Tuesday, August 20, 2002 4:28 AM To: Multiple recipients of list ORACLE-L Hi, This problem/solution may be posted earlier, but would like to hear a solution from you. I have two table say TAB1 and TAB2. TAB2 is a detail of TAB1 table. 1. TAB1 Pk_key numnber(10) AMT numnber(14,2) ... More colums pk_key is Primary Key. 2. TAB2 Pk_key numnber(10) PK_sl number(2) AMT numnber(14,2) ... More colums 1. pk_key + pk_sl is Primary Key. 2. pk_key is foreign key to tab1 Now I would like to write a trigger in TAB2 for INSERT and UPDATE operation which will update the AMT coloum of TAB1. The value to be updated is sum of AMT coloumn of TAB2 for the PK_KEY value. i.e. select sum(amt) into tot from TAB2 where PK_KEY= :NEW.PK_KEY; Since TAB2 is currently being modified it can not be read. so, how to solve it ? TIA Regards. Naba -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: N J Neog INET: njneog@oil.asm.nic.in Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). ------_=_NextPart_001_01C24A14.4527E900 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable RE: Avoding Mutation of Table trigger

Naba,

The solution for ORA-4091 is to create two = triggers--a row level (before insert or update)
and a statement level (after insert or = update).  In the row level you simply record the values of = :new.AMT
into a PL/SQL table.  Then in the statement = level trigger you perform the calculation based on the
recorded values in the PL/SQL table.  Record = the values using a PL/SQL table in a "package",
that way you won't have to worry about simultaneous = updates by different sessions. 

HTH,
Rich

-----Original Message-----
From: njneog@oil.asm.nic.in [mailto:njneog@oil.asm.nic.in]<= /FONT>
Sent: Tuesday, August 20, 2002 4:28 AM
To: Multiple recipients of list ORACLE-L
Subject: Avoding Mutation of Table trigger


Hi,

    This problem/solution may be = posted earlier, but would like to hear
    a solution from you.

I have two table  say TAB1 and TAB2. TAB2 is a = detail of TAB1 table.

    1. TAB1
          &nb= sp; Pk_key     numnber(10)
          &nb= sp; AMT        numnber(14,2)
          &nb= sp; ... More colums
       = pk_key   is Primary Key.


    2. TAB2
          &nb= sp; Pk_key     numnber(10)
          &nb= sp; PK_sl        number(2)
          &nb= sp; AMT        numnber(14,2)
          &nb= sp; ... More colums
       1. pk_key + = pk_sl  is Primary Key.
       2. pk_key is = foreign key to tab1

Now I would like to write a trigger in TAB2 for = INSERT and UPDATE operation
which will update the AMT coloum of TAB1. The value = to be updated is sum of
AMT coloumn of TAB2 for the PK_KEY value.
    i.e. select sum(amt) into tot = from TAB2 where PK_KEY=3D :NEW.PK_KEY;

Since TAB2 is currently being modified it can not be = read.

so, how to solve it ?

TIA

Regards.

Naba

--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: N J Neog
  INET: njneog@oil.asm.nic.in

Fat City Network Services    -- (858) = 538-5051  FAX: (858) 538-5051
San Diego, = California        -- Public Internet = access / Mailing Lists
---------------------------------------------------------------= -----
To REMOVE yourself from this mailing list, send an = E-Mail message
to: ListGuru@fatcity.com (note EXACT spelling of = 'ListGuru') and in
the message BODY, include a line containing: UNSUB = ORACLE-L
(or the name of mailing list you want to be removed = from).  You may
also send the HELP command for other information = (like subscribing).

------_=_NextPart_001_01C24A14.4527E900-- ------=_NextPartTM-000-461cd080-b5e3-11d6-8b11-00b0d04949c1-- -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Richard Huntley INET: rhuntley@mindleaders.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).