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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Middle Tier spawning sessions, possible performance issues
250 connections from the middle tier does sound a bit suspect, way over the
top. I'm assuming 'spawns' relates to establishing connections as and when
required and then disconnecting when done. I think you will find that there
is quite an Oracle overhead in handling all of the connect/disconnect
requests that Oracle is coping with in a non connection pooled environment.
Ideally, you shouldn't be spawning connection from the middle tier. You should look at connection pooling ie. configure a fixed pool of connections per middle tier server, 20/40/whatever (and have more than one middle tier server, load balanced) and have these connect when the app/web server starts up. You then round robin the connections to the clients when required, and throw them back in the pool when finished.
Ade
-----Original Message-----
Sent: 30 January 2003 14:35
To: Multiple recipients of list ORACLE-L
R - I haven't yet been the victim of .net (thankfully), and I hope someone with direct experience will reply. But just in case, I'll mention a couple of ideas.
Try to sample the SQL that is being inflicted on Oracle. Microsoft interfaces tend to have default settings for the lowest common denominator (like accessing a flat file). I've seen them do stuff like pull the entire table over just to verify that it hasn't changed. This sort of thing can usually be corrected by using other than default settings.
Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Thursday, January 30, 2003 7:15 AM
To: Multiple recipients of list ORACLE-L
I'm far more of a developer than a DBA, but when someone told me this it set off a big red light in my head.
We are using an Oracle Backend with a .net front front. One of our .net guys told me that the middle tier they are using 'spawns' sessions.
We have 2 pretty distinct skillsets here so fixing the middle tier is probably way beyond my pervue. However, they told me that in a recent demo, the performance degraded overtime. Its my understanding that generally this is caused by one of two things.
Am I on the right track here? How much would shared server mode help? This may be an enormous issue since they are expecting 250 contiguous users. Another option I tossed around was moving as much logic from the client side to the database to avoid the session spawning. I know that generally this is a good idea, but its difficult when the database people are lousy in C# and the .net people our lousy in PL/SQL and SQL.
Any opinions?
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