Re: ORA-04091: table mutating problem?

From: Connor McDonald <hamcdc_at_yahoo.co.uk>
Date: Fri, 04 May 2001 12:51:45 -0700
Message-ID: <F001.002F98BC.20010504074050@fatcity.com>

Mutating simply means you're trying to access the table that you're trigger is currently firing on (in a row level trigger).

The basic workaround is typically...

before-statement-level
- initialise a PL/SQL table

before-row-level
- store information you need in the PL/SQL table, eg rowid's of rows being inserted

after-statement-level
- loop thru the PL/SQL table and take any action you need to do

hth
connor

• 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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Received on Fri May 04 2001 - 14:51:45 CDT