Re: TNSPING VS. REGULAR PING..! WHY SUCH A DIFFERENCE

From: Tanel Poder <tanel.poder.003_at_mail.ee>
Date: Sat, 27 Dec 2003 12:19:25 -0800
Message-ID: <F001.005DB216.20031227121925@fatcity.com>

I agree that this difference might be only because sqlnet is much more "fat" that ICMP.

But anyway, could some overhead be added be because the failover & load balancing clauses that require extra work?

Also, if listener logs every connection, this might add some extra IO time as well (if writes for log file aren't write buffered).

Tanel.

----- Original Message -----

From: Murali Vallath

To: Multiple recipients of list ORACLE-L

Sent: Tuesday, December 23, 2003 3:29 AM

Subject: TNSPING VS. REGULAR PING..! WHY SUCH A DIFFERENCE

I have recently noticed in this one situation that there is a great difference between a tnsping vs a regular ping to the same server.

for example this tnsping took about 270 ms which is strange and its consistent

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADD
RESS_LIST = (load_balance = on) (failover = on) (ADDRESS = (PROTOCOL = TCP)(HOST
= myhost1.com)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = myhost2.com)(
PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = xyzdb) (FAILOVER_MODE = (TYPE
= SELECT) (METHOD = BASIC) (RETRIES = 20) (DELAY = 15))))
OK (270 msec)

and a ping to the same host

Ping statistics for x.x.x.x:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 61ms, Maximum = 70ms, Average = 67ms

Why could there be such a difference?

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Author: Tanel Poder
  INET: tanel.poder.003_at_mail.ee

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Received on Sat Dec 27 2003 - 14:19:25 CST