Jonathan,
It's just being used in a different context.
Jared
"Jonathan Lewis" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
04/04/2003 11:23 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: Re: Do triggers cause a context switch between SQL & PL/SQL
I have always been puzzled by the expression
"context switch" when talking about sql and pl/sql.
To me, a context switch is something that happens
at the O/S level when a process is suspended by the
scheduler and a different process is resumed. If a
trigger fires on an insert/update/delete, this is obviously
not happening - the only process executing is your
Oracle server (dedicated or MTS) - so what activity is
being given the name "context switch" ? Surely the
Oracle process is 'simply' calling a sub-routine somewhere
else in its code path (and building a stack and acquiring
sub-heaps and ...).
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
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----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: 01 April 2003 19:19
> Since you the action switches from SQL to PL/SQL to enforce the
trigger,
> it sounds like a context switch to me.
>
> FYI: This can be improved somewhat by adding "and rownum < 2 " into
the
> WHERE clauses of these. There will be noticable improvement when
there
> are many child rows.
>
> Jared
>
>
>
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