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Slow Response Time When connecting using SCAN IP (Doc ID 2525873.1)

Last updated on JANUARY 06, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

Observed slow response with tnsping when the scan entry for the RAC and DataGuard servers via dns produce long tnsping times :


>tnsping "(DESCRIPTION_LIST= (LOAD_BALANCE=off) (FAILOVER=on) (DESCRIPTION=(ADDRESS_LIST= (LOAD_BALANCE=on) (ADDRESS=(PROTOCOL=TCP)(HOST=xxx-scan.us.xxxx.com)(PORT=port)))(CONNECT_DATA=(SERVICE_NAME=xxxx,<domain>)))
> (DESCRIPTION=(ADDRESS_LIST=(LOAD_BALANCE=on) (ADDRESS=(PROTOCOL=TCP)(HOST=xxx-scan.<domain>)(PORT=port)))(CONNECT_DATA=(SERVICE_NAME=xxxx,<domain>))))" 22

TNS Ping Utility for Linux: Version 12.1.0.2.0 - Production on 20-MRZ-2019 10:27:28

Copyright (c) 1997, 2014, Oracle. All rights reserved.

Connection attempt with (DESCRIPTION_LIST= (LOAD_BALANCE=off) (FAILOVER=on) (DESCRIPTION=(ADDRESS_LIST= (LOAD_BALANCE=on) (ADDRESS=(PROTOCOL=TCP)(HOST=xxx-scan.<domain>)(PORT=port)))(CONNECT_DATA=(SERVICE_NAME=xxxx,<domain>)))

OK (0 ms)
OK (10 ms)
OK (5000 ms)           <<<<<<<<<<<<<<<<<<
OK (10 ms)

5000 ms is very high value.

Changes

None

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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