REMOVE the past two times

We are on DB Oracle 10.1.0.4 and recently did an update of a simple PACKAGE, which uses only one cursor to identify records in a table, and then as it moves through these records, it removes each via a second SQL statement, essentially as

declare
  cursor csr is select * from table where <date criteria are true>;
  row table%ROWTYPE;
begin
  open csr;
  fetch csr into row;
  loop;
    if csr%NOTFOUND then
      exit;

    else

      delete from table 
      where primary_key_field1 = row.primary_key_field1
        and primary_key_field2 = row.primary_key_field2;

    end;
  end loop;
  close csr;
end;

It turns out that each 1 of 10 (we deletions rollback 53K each time, because we are still troubleshooting program) tent the same line is attempted to remove, as if the first deletion "did not". At first I thought that we were not ALL inclusive of the fields participating in the primary key of the DELETE statement. But this isn't the case.

I can literally sitting there with the same block anonymous PL/SQL that runs the PACKAGE and then just run it on & more & more and eventually it breaks when he tries to 'double - delete' the same record. We even checked the deletion repeat by issuing the: old. ROWID BEFORE Trigger LINE of the table. He appeared 2 times in a row, under the error condition.

The other strange thing is that it breaks on different lines. We have added an ORDER BY on the slider, assuming we get to break in the same place every time. It did not help. 1 out of every 10 executions still broken on a different line.

When we change the structure of encoding to use for the UPDATE... and WHERE CURRENT OF csr then everything works fine.

Someone at - he heard of this type of behavior before?
Thank you
-= Chuck

chuckers wrote:
With the help of a debugging utility, we built in the original code, we found that the PACKAGE with the DELETE statement has not received the focus between the subsequent firing of the trigger for the ROWID even (so there is no way to reset this variable).

You can try to develop more on what your real problem is in your application?

According to your description my understanding so far is the following:

1. you perform a delete in a loop - each iteration of the loop trying to delete a single row with a primary key (composite)

2. you have defined business rules in the triggers - however in this specific case that you want to use the "short-cut" of triggers mode which is activated by setting a package variable in your session

3. after the assessment of the package variable trigger resets this package to NULL variable. Why you set the null of the trigger package variable? Why not run the loop with the 'shortcut' active permanently and turn off when the loop is complete?

4 given to (in your case doubtful) restarting the DML, the same line-level trigger is returned several times to the same line. Because the package variable is set to null in the first execution of the trigger, it will now be NULL in subsequent runs for the same line

So, what happen exactly to your application trigger logic in case the package variable is NULL?

Or is there another problem with your application? Perform any non-transactional operation which then gets pulled several times (as shown / explained by Tom Kyte)? Note that any transactional operation in the trigger is supposed to get restored and restarted so all business logic you have made in the triggers in the same transaction should get restored and re-applied with the reboot. This should have no problem in terms of replay.

As I've mentioned before, your approach is wrong in general since Oracle can raise row-level triggers several times to the same line, reset the package in the trigger variable is a no-go if it breaks your logic in the following possible executions of the trigger for the same line. You can't avoid this and you don't have control over that - quite simply, it can happen (I still wonder why it seems to be happening in your particular case, has shown with single user einreihig deletions).

Kind regards
Randolf

Oracle related blog stuff:
http://Oracle-Randolf.blogspot.com/

Co-author of the book "OakTable Expert Oracle practices":
http://www.Apress.com/Book/view/1430226684
http://www.Amazon.com/Expert-Oracle-practices-database-administration/DP/1430226684

Tags: Database

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