ORA-29760: instance_number parameter not specified

Hi,

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

ORA-29760

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
msdb

[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 12.1.0.2.0 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.

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