Re: VPD Pre/Post Implementation Issues

From: Raj Jamadagni <rjamya_at_yahoo.com>
Date: Thu, 19 Aug 2004 04:18:45 -0700 (PDT)
Message-ID: <20040819111845.28743.qmail@web50010.mail.yahoo.com>

Vivek,

No matter how you do it there will be impact on performance. More so if you use dynamic policies Vs. static policies. As Mogens mentioned, docs are good, but nothing beats testing. You will soon realize that you'll need more indexes on the tables (that have policies enabled), than you'd like, but sometimes it is the only way to bring certain queries in acceptable performance limits. These indexes will expecially be on the columns using which you'll enforce the policies in _most_ cases.

set serveroutput on
begin
  for i in 1 .. 1000
  loop
    dbms_output.put_line('Nothing beats testing in your OWN environment.');   end loop;
end;
/

See, I told you thousand times .. 8:)
Raj

Mogens_Nørgaard <mln_at_miracleas.dk> wrote:

> Test the various scenarios in your environment via 10046 traces with and
> without VPD, single-row stuff and multi-row stuff and bulk loads,
> reports, etc. It's easy to measure that way.
>
> VPD means overhead, of course. Whether it is too much or not for your
> situation, well, it depends.
>
> I seem to recall that the Oracle standard documentation is pretty good
> on this topic. Have you read them already?
>
> Mogens

Best Regards
Raj

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Received on Thu Aug 19 2004 - 06:14:22 CDT