Oracle-L: SQL*Net Connection under-performing

From: VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com>
Date: Sun, 02 Feb 2003 23:58:57 -0800
Message-ID: <F001.00541BE2.20030202235857@fatcity.com>

SITUATION - With DB Server CPU Idle being 0 % & load average 60-70 % :- tnsping Connect to one of the Databases (1) takes about 10,000 ms truss -fdD tnsping <connect string>

29504: 20.0006 18.8113 read(3, "\0 K\0\004\0\0\0 "\0\0 ?".., 2064) = 75

Thus 18.... seconds taken as shown above

Whereas to another Database (2) tnsping takes only 10 ms on the Same machine

DETAILS :-
0) 1 GBPS network path exits from APP Servers to the Database Server.

Database 1 Has about 3500 Oracle processes connecting to it Database 2 Has about 1500 Oracle processes connecting to it
Both Databases have Different ORACLE_HOMEs
sqlnet.ora of Database 1 :- AUTOMATIC_IPC=OFF TRACE_LEVEL_CLIENT=OFF TRACE_LEVEL_SERVER=OFF TNSPING.TRACE_LEVEL=OFF

NO sqlnet.ora exists on Database 2

4) NO process.dat , regid.dat exists in ORACLE_HOME/network/log Dir of ORACLE_HOME for Both Database

5) Multiple listener processes are Running for BOTH Databases

Qs How may the issue be approached ?

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Author: VIVEK_SHARMA
INET: VIVEK_SHARMA_at_infosys.com

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