Connect Via SCAN Intermittently Fails With ORA-12516: TNS:listener Could Not Find Available Handler With Matching Protocol Stack
(Doc ID 1638175.1)
Last updated on DECEMBER 24, 2019
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
o multinode (3+) RAC cluster
o application using SCAN and a dedicated service (here serv1) to connect to the database
o service is configured to run on instances 1 & 2 (preferred)
o intermittently connect attempts fail with error
ORA-12516: TNS:listener could not find available handler with matching protocol Stack
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