Oracle-L: RE: Messing with SDU/TDU in listener.ora

From: Seefelt, Beth <Beth.Seefelt_at_TetleyUSA.com>
Date: Tue, 11 Jun 2002 13:52:06 -0800
Message-ID: <F001.0047B097.20020611135206@fatcity.com>

Turn on sqlnet tracing on a client and see what the sqlnet log says. Here's an example from one of mine. I am using the default SDU/TDU, supposedly.

nsconneg: vsn=310, gbl=0x0, sdu=2048, tdu=32767

-----Original Message-----
Sent: Tuesday, June 11, 2002 5:10 PM
To: Multiple recipients of list ORACLE-L

Hey all,

Running the response_time_breakdown.sql from Steve Adams (http://www.ixora.com.au) on an 8.1.6.0.0 Solaris instance, I'm seeing 40%
of the execution time in "SQL*Net more data from client". I figured that
this was due to the clients being sluggish 3rd-party Java apps, but thought
I'd check into to it anyway.

One thing I noticed is that the SDU and TDU have been set to 32768 in the
listener.ora. First, according to Metalink note 44694.1, this isn't even
valid, since the max size is 32767. Second, I know that the Oracle Names
entry for this instance does not have either of these set. The tnsnames.ora
does, however, and I can't tell which one is being used by the client.

So, before I go ahead and remove these entries from the listener.ora:

Is there a way to tell from the server what the SDU/TDU values of a client are? This way I can tell if the Oracle Names entry is being used by the app or if it's using the tnsnames.ora
Does 32768 have an effect if it's not in the range of valid numbers for SDU/TDU?
Can these parameters affect the "SQL*Net more data from client" wait times?

TIA!

Rich Jesse                           System/Database Administrator
Rich.Jesse_at_qtiworld.com              Quad/Tech International, Sussex, WI

USA
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Author: Jesse, Rich
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Author: Seefelt, Beth
INET: Beth.Seefelt_at_TetleyUSA.com

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