nowait cursors in triggers 2005-06-09 - By Connor McDonald
Hi all,
Does anyone know of a restriction (documented or otherwise) that
prohibits triggers from using 'for update nowait' cursors ?
Consider the following example:
-- ---- ---- ---- ---- ---- ----
SQL> create table T ( x number, y number );
Table created.
SQL> insert into T values (1,1);
1 row created.
SQL> insert into T values (2,1);
1 row created.
SQL> create or replace
2 trigger TRG after delete on T
3 declare
4 cursor C is select * from t
5 where y =3D 1
6 for update NOWAIT;
7 begin
8 open c;
9 end;
10 /
Trigger created.
Session 1 then does the following:
SQL> set sqlprompt 'SES1> '
SES1> delete from t where x =3D 1;
1 row deleted.
Session 2 then tries to delete a different row, but the
after-statement trigger will then try to
get a nowait lock on both rows:
SQL> set sqlprompt 'SES2> '
SES2> delete from t where x =3D 2;
(waiting....waiting....)
Is this correct behaviour ? Why does ses2 not get a "ORA-00054 (See ORA-00054.ora-code.com):
resource busy and acquire with NOWAIT specified"
Cheers
Connor
--=20
Connor McDonald
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=3D=3D
email: connor_mcdonald@(protected)
web: http://www.oracledba.co.uk
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