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 The educated person is not the person who can answer the questions, but the person who can question the answers -- T. Schick Jr One-day tutorials: http://www.jlcomp.demon.co.uk/tutorial.html ____UK_______April 8th ____UK_______April 22nd ____Denmark__May 21-23rd ____USA_(FL)_May 2nd Three-day seminar: see http://www.jlcomp.demon.co.uk/seminar.html ____UK_(Manchester)_May ____Estonia___June (provisional) ____USA_(CA, TX)_August The Co-operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html ----- 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 > > > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jonathan Lewis INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
