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Poor Performance When Using CLOBS and Oracle Net (Doc ID 398380.1)

Last updated on FEBRUARY 27, 2019

Applies to:

Oracle Net Services - Version and later
Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.
Oracle Server - Enterprise Edition - Version: 9.2 to 10.2
This problem can occur on any platform.
CLOBS Oracle Net


Performance of CLOBS can be poor/slow when using Oracle Net.
Typically a Oracle Net client trace will show a delay in the timestamp, reported in two areas.

On Basic read

[000001 17-JAN-2006 10:22:40:997] nttrd: entry
[000001 17-JAN-2006 10:22:41:013] nttrd: socket 292 had bytes read=15
Between Receive and Send

[000001 17-JAN-2006 10:22:41:325] nioqrc: exit
[000001 17-JAN-2006 10:22:54:014] nioqsn: entr

These delays are repeated often, slowing down response time. Changing SDU or arraysize will not assist here.
Database stats pack report can report high value for "SQL*Net message from Client"




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