TNS-12536: TNS:operation would block

Hi,

Sometimes You can get “TNS-12536: TNS:operation would block ” error.

 

Details of error are as follows.

TNS-12536: TNS:operation would block
Cause: An internal operation did not commence because to do so would block the current process
and the user has requested that operations be non-blocking.
Action: None needed; this is an information message.

sqlplus / as sysdba
SQL*Plus: Release 12.1.0.2.0 Production on Tue Apr 28 16:17:44 2016
Copyright (c) 1982, 2019, Oracle. All rights reserved.

ERROR:
TNS-12536: TNS:operation would block
Enter user-name:
ERROR:
ORA-12536: TNS:operation would block
Enter user-name:
ERROR:
ORA-12536: TNS:operation would block
SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus

 

 

This error is related with the maxuproc ( Maximum number of PROCESSES ) was set too low

lsattr -El sys0 | grep maxuproc
maxuproc 128 Maximum number of PROCESSES allowed per user True

 

To solve this error, increase it to 16384

lsattr -El sys0 | grep maxuproc

maxuproc 16384 Maximum number of PROCESSES allowed per user True

 

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 mehmetsalih.deveci@outlook.com. -                                                                                                                                                                                                                                                 - Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  mehmetsalih.deveci@outlook.com a mail atabilirsiniz.

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