Re: Re: Row level security and latch waits

so in 9i dbms_rls increases the soft parses?
>
> From: Connor McDonald <hamcdc_at_yahoo.co.uk>
> Date: 2003/08/20 Wed AM 11:21:59 EDT
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Subject: Re: Re: Row level security and latch waits
>
> My understanding was that the rls predicate was added
> at parse time (hence the importance of the contexts
> and avoiding things like 'sysdate')
>
> But also if I remember correctly, this behaviour was
> changed in v9 to process the security function with
> each execution (and hence probably increase the amount
> of parsing going on).
>
> You might want to have a play the the
> "_dynamic_policies" parameter (or something like that)
> which can be used to revert the 8i behaviour (which
> should reduce parsing to a degree)
>
> hth
> connor
>
> --- Nuno Souto <nsouto_at_optusnet.com.au> wrote: >
> ----- Original Message -----
> >
> > > - Use context values within predicates, as bind
> > variables <<<< NOTE THIS
> > > LINE.>>>>>
> >
> >
> > None of that implies it's not appending a where
> > clause like it
> > was explained.
> >
> > It uses the context values (if that's the case) in a
> > function
> > which then returns a string. That string is then
> > appended
> > as a predicate to the original statement. That
> > means the
> > original statement is then re-parsed. It's the
> > reason why
> > you need query-rewrite enabled in FGAC.
> > So, you get a lot of parsing.
> >
> > I don't know of any way of passing a context value
> > as a true bind variable in a return string which is
> > appended
> > as a predicate. It certainly is not explained
> > anywhere
> > in the manual how to do it and I couldn't find
> > anything
> > in the literature and asktom either.
> >
> > Appreciate if anyone can explain how.
> >
> > A dynamically generated string is not the same as a
> > bind variable.
> >
> > Cheers
> > Nuno Souto
> > nsouto_at_optusnet.com.au
> >
> > --
> > Please see the official ORACLE-L FAQ:
> > http://www.orafaq.net
> > --
> > Author: Nuno Souto
> > INET: nsouto_at_optusnet.com.au
> >
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> =====
> Connor McDonald
> web: http://www.oracledba.co.uk
> web: http://www.oaktable.net
> email: connor_mcdonald_at_yahoo.com
>
> "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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> INET: hamcdc_at_yahoo.co.uk
>
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