Trigger giving an error

Question

I have a trigger defined as follows:
create or replace trigger TR_MY_TRIGGER after
delete or
update on member
begin
end;
At the end of the trigger I have a SELECT on the member table, the table on which this trigger is based. I get a mutating error: ORA-04091: table member is mutating
How can I get around this problem? I have tried to put the select in a procedure, but that does not work either. I have also tried to put pragma autonomous_transaction in the trigger, but to no avail.
Thanks
Edited by: user447219 on Nov 2, 2012 10:27 AM
Edited by: user447219 on Nov 2, 2012 10:28 AM

Answer 1

user447219 wrote:
At the end of the trigger I have a SELECT on the member table, the table on which this trigger is based. So when you select from the table do you know if you are getting the new or old values that are both present in a row level trigger? And which values do you want?
I get an error message: An error occured.ORA-20505| Error in DML| p_rowid=
You actually get a different error
http://docs.oracle.com/cd/E11882_01/server.112/e17766/e2100.htm#sthref1926
>
ORA-04091: table string.string is mutating, trigger/function may not see it
You are just hiding it and replacing it with that useless message to make troubleshooting and debug more difficult.
How can I get around this problem? I have tried to put the select in a procedure, but that does not work either. I have also tried to put pragma autonomous_transaction in the trigger, but to no avail.The mutating table error is like the safety catch on a gun that makes it go click when you aim it at your toes and pull the trigger. You should not work around it, it is trying to tell you what you are trying to do is not reliable. Autonomous transactions are not a fix for this.
You should read this and then find a different way to do whatever it is you need to do.
http://docs.oracle.com/cd/E11882_01/server.112/e25789/part_txn.htm#CHDJIGBH