Re: Deterministic Functions: am I missing something?

From: Connor McDonald <hamcdc_at_yahoo.co.uk>
Date: Fri, 03 Oct 2003 05:51:05 -0800
Message-ID: <F001.005D1F36.20031003055105@fatcity.com>

As far as I know, with all current releases of Oracle, determinism is purely for function based indexes. The deterministic keyword indicates that the function values when you created the index are still preserved when you query it.

Thus the "first" execution was during index creation, and the "second" execution is during subsequent queries during which the function does not need to be executed because it is deterministic.

(Lame eh?)

• "Khedr, Waleed" <Waleed.Khedr_at_FMR.COM> wrote: > drop table test_det;
  > create table test_det (c1 date);
  > create or replace function f2 (p1 in number, p2 in
  > number) return number
  > deterministic is
  > pragma autonomous_transaction;
  > begin
  > insert into test_det values (sysdate);
  > commit;
  > return(p1 * p2);
  > end;
  > /
  > select f2 (1,3) from dual where f2 (1,3) = 3;
  > F2(1,3)
  > ----------
  > 3
  > select * from test_det;
  > C1
  > ---------
  > 02-OCT-03
  > 02-OCT-03
  > It did not save an execution even in the same sql
  > call!
  > Oracle 9.2.0.2 Solaris 2.8
  > Regards,
  >
  > Waleed
  >
  > --
  > Please see the official ORACLE-L FAQ:
  > http://www.orafaq.net
  > --
  > Author: Khedr, Waleed
  > INET: Waleed.Khedr_at_FMR.COM
  >
  > Fat City Network Services -- 858-538-5051
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Connor McDonald
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"GIVE a man a fish and he will eat for a day. But TEACH him how to fish, and...he will sit in a boat and drink beer all day"

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Received on Fri Oct 03 2003 - 08:51:05 CDT