ORA-12552: TNS:operation was interrupted


Sometimes You can get “ORA-12552: TNS:operation was interrupted ” error.


Details of error are as follows.

ORA-12552: TNS:operation was interrupted
Cause: An internal operation was interrupted and could not complete.
Action: Not normally visible to the user. For further details, turn on tracing and reexecute the operation. If error persists, contact Oracle Customer Support.



This error is related with the Issue is fixed from version 12.1 onwards.

One off patches are available for Patch:9455447
Workaround : Set database parameter _skgxp_udp_timed_wait_seconds=0

_ skgxp_udp_timed_wait_seconds=0 disables the timeout of the LMS processes, so they continue reading messages.
LMS handles messages between the nodes e.g. cache fusion
Typically it waits for acknowledgment of received and sent packets
Disabling the timeout will mean it does not timeout on the acknowledgment , but keeps processing requests, waiting for acknowledgment to arrive.

Only set the parameter to 0 after guidance from Oracle support


Do you want to learn more details about RMAN, then read the following articles.



About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience.I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource.I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks.I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients.If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress [email protected].-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  [email protected] a mail atabilirsiniz.

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