A SMALL EXAMPLE CODE FOR MUTATING ERROR

Question

create or replace trigger TRG_T1
before insert on T1
begin
insert into T1 values(2);
end;
IF I TRY TO INSERT INTO T1 TABLE I GET A MUTATING ERROR HOW CAN I SOLVE??????

Answer 1

joealexander wrote:
create or replace trigger TRG_T1
before insert on T1
begin
insert into T1 values(2);
end;
IF I TRY TO INSERT INTO T1 TABLE I GET A MUTATING ERROR HOW CAN I SOLVE??????
No, you do NOT get a mutating table error. You get this:
orcl112> create table t1(c1 number);
Table created.
Elapsed: 00:00:00.03
orcl112> create or replace trigger TRG_T1
  2
  3  before insert on T1
  4
  5  begin
  6
  7  insert into T1 values(2);
  8
  9  end;
10
11  /
Trigger created.
Elapsed: 00:00:00.04
orcl112> insert into t1 values (1);
insert into t1 values (1)
ERROR at line 1:
ORA-00036: maximum number of recursive SQL levels (50) exceeded
ORA-06512: at "SCOTT.TRG_T1", line 3
ORA-04088: error during execution of trigger 'SCOTT.TRG_T1'
ORA-06512: at "SCOTT.TRG_T1", line 3
ORA-04088: error during execution of trigger 'SCOTT.TRG_T1'
ORA-06512: at "SCOTT.TRG_T1", line 3
ORA-04088: error during execution of trigger 'SCOTT.TRG_T1'
ORA-06512: at "SCOTT.TRG_T1", line 3
ORA-04088: error during execution of trigger 'SCOTT.TRG_T1'
ORA-06512: at "SCOTT.TRG_T1", line 3
ORA-04088: error during execution of trigger 'SCOTT.TRG_T1'
You are the second person today who has claimed to have seen this error and posted code that did not raise it. What is going on?