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Re:Multi Threaded Server

From: <dgoulet_at_vicr.com>
Date: Tue, 03 Apr 2001 10:47:38 -0700
Message-ID: <F001.002DFEF4.20010403101915@fatcity.com>

Jack,

    I use MTS of any instance were the company intranet gets involved for similar reasons. There are two problems that I've run into with MTS over the years. The first is running out of shared pool space. With MTS the query and resulting data get stored in the shared pool, so at least one should increase this setting in init.ora. The second gets into the basics of configuring MTS. First, make sure there are a minimum of at least 2 shared servers per dispatcher. If you've for 3 dispatchers then you need a minimum of 6 shared servers. The DB will not complain on startup if this is wrong, but it will at some time thereafter, by crashing. The second has to do with the number of shared servers there are during normal operations. Remember that once a user submits a transaction to the database that it will sit in the shared pool awaiting processing until a server becomes available. This very much a FIFO operation, so if all of the servers are busy then it may wait for a long time. My rule of thumb is to set MTS_MAX_SERVERS equal to 75% of max expected connections. The actual number running at any time will vary between the minimum and maximum which is what it's suppose to do. Also, configure at least one connection method that will use a dedicated server. Helps an awful lot with batch data loads, actually an Oracle recommendation.

Dick Goulet

____________________Reply Separator____________________
Author: nlzanen1_at_EY.NL
Date:       4/3/2001 7:32 AM

Hi All,

We have about 400-500 connections to our database and are now considering going to MTS.

Can anybody share their experience? pitfalls? things to take care of? performance issues?

Any help appreciated.

Our main objective is to lower the amount of RAM consumed by the Oracle sessions.

Jack

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Received on Tue Apr 03 2001 - 12:47:38 CDT

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