ORA-29760: instance_number parameter not specified


Sometimes You can get “ORA-29760: instance_number parameter not specified ” error.


ORA-29760: instance_number parameter not specified Error

Details of error are as follows.

ORA-29760: instance_number parameter not specified

Cause: The init.ora file did not contain a value for the instance_number which is required to identify this instance to other instances of the database running on the same cluster

Action: Assign a value to the instance_number parameter in the init.ora parameter file

SQL> startup
ORA-29760: instance_number parameter not specified




This ORA-29760: instance_number parameter not specified error is mostly seen conversion of Single Instance to Oracle RAC. So If you got this error during RAC conversion, then firstly check your INSTANCE_NAME.

Check the Oracle SID, if it is wrong, then fix it and try again.


[oracle@msdbadm01 ~]$ echo $ORACLE_SID

[oracle@msdbadm01 ~]$

Instance name should be msdb1 , change it and try again.

[oracle@msdbadm01 ~]$ export ORACLE_SID=msdb1

[oracle@msdbadm01 ~]$ sqlplus / as sysdba
SQL*Plus: Release Production on Sun Apr 23 00:18:05 2015
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 4275781632 bytes
Fixed Size 2220200 bytes
Variable Size 889196376 bytes
Database Buffers 3372220416 bytes
Redo Buffers 12144640 bytes
Database mounted.
Database opened.



Do you want to learn Oracle Database for Beginners, then read the following articles.

Oracle Tutorial | Oracle Database Tutorials for Beginners ( Junior Oracle DBA )

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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