TNS-12615: TNS preempt error

Hi,

Sometimes You can get “TNS-12615: TNS:preempt error ” error.

 

Details of error are as follows.

TNS-12615: TNS:preempt error
Cause: A request to service an event failed because no event notification has yet been posted.
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 Too many concurrent connection requests.

Increase the queuesize as follows.

 

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.63.34)(PORT = 1521)(QUEUESIZE=1000))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)

 

Or  Second case related with this error is as follows.
The issue is related to load and overhead related to Automatic Diagnostic Repository (ADR) functionality and IO issues on the database server.  The combination of these results in slowness in spawning the database shadow processes, causing number of connection requests to be queued by the TNS Listener and internal limits restrictions to be reached.

Each new shadow process that is spawned tries to create the ADR directories, even if they already exist.

This is due to Unpublished Bug:9700115 CHECK ADR DIRECTORIES EXISTENCE AND ATTRIBUTES FIRST BEFORE CREATING THEM

As a workaround, set the following initialization parameter for the 11g Database instance(s) to disable the Automatic Diagnostic Repository (ADR) mechanism.
_diag_adr_enabled=FALSE

and/or:

Apply Patch:9700115 to change the behavior of the ADR to check if the subdirectories exists before it tries to create them.

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

https://ittutorial.org/rman-backup-restore-and-recovery-tutorials-for-beginners-in-the-oracle-database/

 

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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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