Solve mutating table error

Hi,
I want a solution for mutating table error. I am a newbie in oracle.
I'll explain my scenario.
There are two tables TEACHER and STUDENT
both are linked using the field 'tid'. the foreign key relation is given as ON DELETE CASCADE
so if i delete a row from teacher , the corresponding rows in student get deleted, but i want to back up all the students who comes under that teacher, who is getting deleted.
I tried in TRIGGER, but getting mutating table error.
Please help
Thanks in advance
Divya

This extract from an earlier post might be of help:
You can solve this problem by using following thing
1)create a view on same table with all fields
and write trigger on table (insert,update or delete ) while inserting or updating or deleting row from table read from view.
(Mutating error come when you are reading from one table and want to update,insert or delete row of same table).
2)create a temporary table(but it is possible in 8i onword only) same as table on which you want to write trigger,while updating,inserting or deleting rows of table read from temporary table and after your work is over temporary table auotomatically drop (see proper command in oracle documentation to create temporary table).
null

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  • How to solve mutating table error?

    I compiled the trigger below successfully:
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    FROM products_tbl p, orders_tbl o
    WHERE ord_num=:NEW.ord_num;
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    WHERE prod_id=m_prodid;
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    RAISE_APPLICATION_ERROR(-20101,'Product is not available');
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    BEGIN
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    INTO v_max
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    INSERT INTO orders_tbl(ord_num, cust_id, prod_id, ord_qty, ord_date, dvy_date, refund)
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    WHERE ord_num = (SELECT MAX(ord_num) FROM orders_tbl) AND dvy_date>ord_date+3;
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    It gives me these errors:
    ERROR at line 1:
    ORA-01403: no data found
    ORA-01403: no data found
    ORA-06512: at "SYSTEM.AVAIL_PRODUCTS", line 9
    ORA-04088: error during execution of trigger 'SYSTEM.AVAIL_PRODUCTS'
    ORA-06512: at line 10
    I try to debug it again and again but still can't find the mistake. So I change the trigger option to AFTER INSERT, then I got the error message that the table is mutating and trigger migh not see it. Anyone know how to solve this problem?
    ERROR at line 2:
    ORA-04091: table SYSTEM.ORDERS_TBL is mutating, trigger/function may not see it
    ORA-06512: at "SYSTEM.AVAIL_PRODUCTS", line 13
    ORA-04088: error during execution of trigger 'SYSTEM.AVAIL_PRODUCTS'
    null

    This extract from an earlier post might be of help:
    You can solve this problem by using following thing
    1)create a view on same table with all fields
    and write trigger on table (insert,update or delete ) while inserting or updating or deleting row from table read from view.
    (Mutating error come when you are reading from one table and want to update,insert or delete row of same table).
    2)create a temporary table(but it is possible in 8i onword only) same as table on which you want to write trigger,while updating,inserting or deleting rows of table read from temporary table and after your work is over temporary table auotomatically drop (see proper command in oracle documentation to create temporary table).
    null

  • Mutation table error

    i am trying to updata any row at the time i am getting mutating table error for some triggers
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    Here's a good resource
    http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:290416059674

  • Mutating table error

    Hi All,
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    >>
    Any suggestions on how to get around the mutating
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    This link by Tom Kyte should help you with the
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    http://asktom.oracle.com/tkyte/Mutate/index.html
    pratzPratz,
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    Thanks,
    Chiru

  • Mutating table error in Trigger

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    Hi,
    From Documentation
    mutating table is a table that is currently being modified by an UPDATE, DELETE, or INSERT statement, or a table that might be updated by the effects of a DELETE CASCADE constraint.
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    To avoid..an article by tom kyte.
    http://asktom.oracle.com/pls/asktom/ASKTOM.download_file?p_file=6551198119097816936
    Hope it helps,
    CKLP                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

  • ORA-04091 mutating table error

    Hi,
    Using Oracle 8.1.7 on Windows 2000.
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    Thanks in advance,
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    Hello
    You need a combination of before statement, after row and after statement to get round this:
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    Also, is more than one person going to insert into this table at once? If so, you run the risk of 2 people selecting the same max code at the same time and so 2 rows could end up with the same code. Just a suggestion but this looks like it could be better served with a sequence, and you may be able to get rid of the trigger all together.
    HTH
    David

  • Trying to automatically add a new row w/o mutating table error...

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  • Mutating Trigger error while updating table

    Hi Guys,
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    Regards,
    -LRK

    You'll have to read these articles first, they explain what's the problem and how to deal with it:
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  • How to solve mutating error

    i am getting mutating table error in triggers how to avoid this error

    Hi,
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  • Mutating table

    Hello,
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    Hi ,
    I also paste the following proposed by Oracle .......about mutating tables
    A mutating table is a table that is being modified by an UPDATE, DELETE, or INSERT statement, or a table that might be updated by the effects of a DELETE CASCADE constraint.
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    When a trigger encounters a mutating table, a runtime error occurs, the effects of the trigger body and triggering statement are rolled back, and control is returned to the user or application.
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    AFTER DELETE ON Emp_tab
    FOR EACH ROW
    DECLARE
        n INTEGER;
    BEGIN
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        DBMS_OUTPUT.PUT_LINE(' There are now ' || n ||
            ' employees.');
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    ORA-04091: table SCOTT.Emp_tab is mutating, trigger/function may not see it
    If you delete the line "FOR EACH ROW" from the trigger, it becomes a statement trigger which is not subject to this restriction, and the trigger.
    If you need to update a mutating table, you could bypass these restrictions by using a temporary table, a PL/SQL table, or a package variable. For example, in place of a single AFTER row trigger that updates the original table, resulting in a mutating table error, you might use two triggers—an AFTER row trigger that updates a temporary table, and an AFTER statement trigger that updates the original table with the values from the temporary table.
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    Simon

  • Mutating table confusion

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             3          1 27-OCT-10 28-OCT-10
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    --=Chuck

    It's a multi-row update that causes the issue, not a single row update:
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    insert into check_mte select * from check_mte
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    ORA-04091: table CHECK_MTE is mutating, trigger/function may not see it
    ORA-06512: at "CHECK_MTE", line 4
    ORA-04088: error during execution of trigger CHECK_MTE'

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      7   where fk = :old.pk;
      8  end;
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    SQL> insert into c values (1);
    1 row created.
    SQL> select * from c;
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      3  where pk = 1;
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    < mutating table and row state >
    BTW, you don't seem to have run into the mutating table error though 2 other threads today are also about it. You have a constraint violation, a different thing entirely.
    I believe the second scenario works because you're neatly avoiding the error of the first. The error "ORA-02291: integrity constraint (FORBESC.SYS_C00169150) violated" means that on insert Oracle is looking up the value you're trying to insert, not finding it, and raising an error. With the before trigger you are taking the assigned value from the insert, updating the parent to it, so that on actual insert when the check happens the value is there due to the update.
    I'm not convinced this is a good idea because any on-the-fly approach to data entry needs to be examined carefully.

  • MUTATING TABLES(ORA-04091) ERROR

    HI ALL,
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    sorry, my mistake, point 7-8 became:
    7) But if u now login with the sys dba account:
    connect sys/dbapass@database
    then drop student.trg_a and student.trg_b and then recreate both under the sys schema:
    CREATE OR REPLACE TRIGGER SYS.TRG_A
    AFTER INSERT OR DELETE ON STUDENT.P
    FOR EACH ROW
    begin
    if deleting then
    update STUDENT.Q set cnt=cnt-1 where id=2;
    else
    update STUDENT.Q set cnt=cnt+1 where id=2;
    end if;
    end;
    /--- cut point for trigger creation
    CREATE OR REPLACE TRIGGER SYS.TRG_B
    AFTER INSERT OR UPDATE ON STUDENT.Q
    FOR EACH ROW
    declare
    p number;
    maxr number;
    begin
    select sum(CNT) into p from STUDENT.Q where id=:new.id;
    select sum(MAX) into maxr from STUDENT.R where id=:new.id;
    dbms_output.put_line('P:'||p||', maxr:'||maxr);
    if (p<=maxr) then
    dbms_output.put_line('p<=maxr is true');
    else
    dbms_output.put_line('p<=maxr is false');
    end if;
    end;
    8) reconnect with ur working user account:
    example: connect student/password@database
    9) when re-doing inserts as point 6), the trigger sys.trg_b will fire without raising any ora-04091 error!!!!
    The trigger behave like if the mutating table limitation is not existing at all!!!
    does anyone know anything about this behavior?
    thank u very much
    sincerely

  • Error "Mutating table" when execute a trigger

    Hi all,
    I'm a newbie in oracle. Recently i do some database migration from sql server 2005 to oracle 11g. Some of my table are using trigger which is not running in oracle. It has error "mutating table" when i'm trying to update some table. According to some information i got from the internet this can be solve by creating 1 packages and 3 trigger, but i found this article http://www.oracle.com/technetwork/issue-archive/2008/08-sep/o58asktom-101055.html which confuse me much. It says that the trigger is not allowed to be used for multiple user, meanwhile my application was for multiple user. What should i do then ?
    *sorry for my bad english                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

    Hi,
    Sorry for my late reply, below is one of my trigger that causes error. This trigger was automatically created when im doing the migration.
    create or replace
    TRIGGER "DBO_ORACLE_240312".tgrRwyPktUpd
    -- =============================================
    -- Author:          Debora Farah Rasul
    -- Create date: 09.02.2012
    -- Description:     Update Riwayat Pangkat untuk data SKCPNS/SKPNS
    -- =============================================
    AFTER UPDATE
    ON RiwayatPangkat
    FOR EACH ROW
    DECLARE
    v_temp NUMBER(1, 0) := 0;
    BEGIN
    IF NULL/*TODO:TRIGGER_NESTLEVEL()*/ > 2 THEN
    RETURN;
    END IF;
    --SQL Server BEGIN TRANSACTION;
    BEGIN
    SELECT 1 INTO v_temp
    FROM DUAL
    WHERE ( ( SELECT :NEW.isTrigger
    FROM DUAL ) = -1 );
    EXCEPTION
    WHEN OTHERS THEN
    NULL;
    END;
    IF v_temp = 1 THEN
    BEGIN
    MERGE INTO SKCPNS
    USING (SELECT :NEW.PegawaiID AS PegawaiID, :NEW.NoNota AS NoNota, :NEW.NoSK AS NoSK, :NEW.TglSK AS TglSK, :NEW.TMTPangkat AS TMTPangkat, :NEW.PangkatID AS PangkatID
    FROM dual) src
    ON (SKCPNS.PegawaiID = src.PegawaiID )
    WHEN MATCHED THEN UPDATE SET NoNota = src.NoNota,
    NoSK = src.NoSK,
    TglSK = src.TglSK,
    TMTCPNS = src.TMTPangkat,
    PangkatID = src.PangkatID;
    END;
    ELSE
    BEGIN
    SELECT 1 INTO v_temp
    FROM DUAL
    WHERE ( ( SELECT :NEW.isTrigger
    FROM DUAL ) = -2 );
    EXCEPTION
    WHEN OTHERS THEN
    NULL;
    END;
    IF v_temp = 1 THEN
    BEGIN
    MERGE INTO SKPNS
    USING (SELECT :NEW.PegawaiID AS PegawaiID, :NEW.NoSK AS NoSK, :NEW.TglSK AS TglSK, :NEW.TMTPangkat AS TMTPangkat, :NEW.PangkatID AS PangkatID
    FROM dual) src
    ON ( SKPNS.PegawaiID = src.PegawaiID )
    WHEN MATCHED THEN UPDATE SET NoSK = src.NoSK,
    TglSK = src.TglSK,
    TMTPNS = src.TMTPangkat,
    PangkatID = src.PangkatID;
    END;
    END IF;
    END IF;
    MERGE INTO RiwayatGaji
    USING (SELECT :NEW.PegawaiID AS PegawaiID, :NEW.NoUrut AS NoUrut, :NEW.NoSK AS NoSK, :NEW.TglSK AS TglSK, :NEW.TMTPangkat AS TMTPangkat, :NEW.PejabatPenetap AS PejabatPenetap, :NEW.MasaKerjaTh AS MasaKerjaTh, :NEW.MasaKerjaBl AS MasaKerjaBl, :NEW.PangkatID AS PangkatID, :NEW.JenisKP AS JenisKP
    FROM dual) src
    ON ( RiwayatGaji.PegawaiID = :NEW.PegawaiID
    AND RiwayatGaji.isTrigger = :NEW.NoUrut)
    WHEN MATCHED THEN UPDATE SET NoSK = src.NoSK,
    TglSK = src.TglSK,
    TMTSK = src.TMTPangkat,
    PejabatPenetap = src.PejabatPenetap,
    MasaKerjaTh = src.MasaKerjaTh,
    MasaKerjaBl = src.MasaKerjaBl,
    PangkatID = src.PangkatID,
    JenisKenaikan = src.JenisKP;
    END;
    *Btw thank u for the reply :)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

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