Re: in addition -- ORA-04091: table mutating problem?

What's your version of Oracle? I usually have a stock answer on how to solve this type of problem, but I just tried out your problem on my little Personal Oracle here, and to my INCREDIBLE surprise, the trigger worked and I didn't get an error. Does anyone know if that's just because I'm using Personal Oracle, or did they actually manage to guarantee consistency when the tables are mutating in 8.1.6? This is the trigger text I used:

     create or replace trigger bir_tableB
     before insert on tableB
     for each row
     declare
          cursor get_max_date is
               select max(create_date)
               from tableB;
          maxDate   date;
     begin
          open get_max_date;
          fetch get_max_date into maxDate;
          close get_max_date;

          if (:new.create_date < nvl(maxDate, :new.create_date)) then
               raise_application_error(-20101, 'New date must be greater
than any existing record.');
          end if;
     end bir_tableB;

Diana Duncan
TITAN Technology Partners
One Copley Parkway, Ste 540
Morrisville, NC 27560
VM: 919.466.7337 x 316
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E: Diana_Duncan_at_ttpartners.com

                                                                                       
                            
                    Leslie Lu                                                          
                            
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                    05/03/2001                                                         
                            
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In addition to my previous question:

supposed you cannot use Max(date), and MUST use the cursor. (may be my example is not a good one), anyway, I'd like to know how to get around this mutating problem. Thank you!

• Leslie Lu <leslie_y_lu_at_yahoo.com> wrote:
  > Hi all,
  >
  > I got ORA-04091: table mutating problem. Here is
  > the
  > case: select from table A and insert them into table
  > B. A trigger is used to check that new DATE must be
  > later than every DATE in B. So I open an cursor,
  > loop
  > through cursor to compare new DATE value.
  >
  > If I tested using hard coded value, the trigger
  > works;
  > if do a insert ... select, I got ORA-04091.
  >
  > I looked through metalink, didn't see anything that
  > can help.
  >
  > Thank you in advance.
  >
  > Leslie
  >
  

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