RE: sort latch usage in MTS mode

Also, it's not called MTS anymore, it's shared server.

RF

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  -----Original Message-----
  From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Ted Coyle   Sent: Wednesday, August 08, 2007 6:28 AM   To: zhuchao_at_gmail.com; 'Rajeev Prabhakar'   Cc: 'oracle-l'
  Subject: RE: sort latch usage in MTS mode

  "Looks like not much people have the experience with 10g MTS yet."

  Yet? I hope never..

  MTS is bad, plain and simple. This falls into my "Don't by a problem" category.

  Since leaving 8i behind, I've seen MTS as something that should be used as a short term work-around.

  I've found hardware load balancing and application pooling to be far more effective without incurring queuing inherent with MTS.

  Ted

  From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Zhu,Chao
  Sent: Wednesday, August 08, 2007 4:50 AM   To: Rajeev Prabhakar
  Cc: oracle-l
  Subject: Re: sort latch usage in MTS mode

  Looks like not much people have the experience with 10g MTS yet.   To Kevin:

  SQL> select * from v$License;

  SESSIONS_MAX SESSIONS_WARNING SESSIONS_CURRENT SESSIONS_HIGHWATER USERS_MAX

• ---------------- ---------------- ------------------ --------
  --
  0 0 11474 13293 0

   For sure we use middleware to do connection pooling. We still can't make the connection below 8-10k for some databases;

  To Alex:
  sort will use large pool in MTS mode. Please check out metalink note 223153.1. It is very easy to reproduce/prove.

  Is there any guys from Amazon type company here in the list? A script enabled browser is required for this page to function properly. A script enabled browser is required for this page to function properly.

  On 8/7/07, Rajeev Prabhakar < rprabha01_at_gmail.com> wrote:

  Hi Zhu Chao

  Could you please run the following

  query and post the results :

  select * from v$sgastat order by 3 ;

  -Rajeev

  On 8/6/07, Nigel Thomas <nigel_cl_thomas_at_yahoo.com > wrote:

  Zu Chao wrote: maybe not many people use MTS recently due to nearly-free RAM. But when connection# goes real high, you still have to, and we are such a user.

  Kevin Closson replied: just out of curiosity, what is "real high" in terms of connect count?

   And another (maybe irrelevant) point: when there is a mid-tier shared connection pool, that can also act as a concentrator/multiplexer (eg I have LoadRunner tested 2000 "users" executing a realistic high volume workload with (iirc) only 100-200 real Oracle connections). Yes, I know 2000 is not "real high" :) but you can scale out this approach.

  MTS and app server shared pool have different strengths and weaknesses (for the benefit of the BAAG party - or just to stimulate more informed replies - I'll refrain from proving my ignorance by guessing what they are :-).

  Regards Nigel

  --
  Regards
  Zhu Chao
  www.cnoug.org

--

http://www.freelists.org/webpage/oracle-l Received on Wed Aug 08 2007 - 10:28:40 CDT