My experience (it was on 7.3.4 on Solaris, do not know current behavior))
that when number of requests > max_shared_servers Oracle create dedicated
connection and writes record in the alert.log file.
Alex Hillman
-----Original Message-----
From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, April 03, 2001 2:19 PM
To: Multiple recipients of list ORACLE-L
Subject: Re:Multi Threaded Server
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: [EMAIL PROTECTED]
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
(Oracle DBA) Informatie Systemen
Ernst & Young
Informatie & Communicatie Technologie
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