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ORA-65500: could not modify DB_UNIQUE_NAME, resource exists


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How to Fix ORA-65500: could not modify DB_UNIQUE_NAME, resource exists

SQL> alter system set db_unique_name='TST1TP' scope=spfile;
alter system set db_unique_name='TST1TP' scope=spfile
*
ERROR at line 1:

ORA-32017: failure in updating SPFILE

ORA-65500: could not modify DB_UNIQUE_NAME, resource exists

Cause: The cause of the issue is an entry of the resource in clusterware repository.
Bug 20876249 : COULD NOT MODIFY DB_UNIQUE_NAME RESOURCE EXISTS
Solution1:
Remove the configuration from crs repository
$ srvctl config database -d TST1T
$ srvctl status database -d TST1T
Database is running.
$ srvctl remove database  -d TST1T -f
Modify the parameter in SPFILE and Restart the database
SQL> alter system set db_unique_name='TST1TP' scope=spfile;
System altered.
SQL> startup force;
ORACLE instance started.
Total System Global Area 2147483648 bytes
Fixed Size                  8794848 bytes
Variable Size            1912605984 bytes
Database Buffers          218103808 bytes
Redo Buffers                7979008 bytes
Database mounted.
Database opened.
Add the DB resource to CRS repository
$ srvctl add database -db TST1TP -oraclehome /u01/dbatst1/12.2.0.1/dbp1 -spfile /u01/dbatst1/12.2.0.1/dbp1/dbs/spfileTST1T.ora

 Solution2:
Create pfile from spfile
SQL> create pfile from spfile;
File created.
Manually edit the pfile and add/modify the db_unique_name parameter 
*.db_unique_name='TST1TP'
Stop the database
SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
Create the spfile from pfile
SQL> create spfile from pfile;
File created.
Start the database with updated spfile
SQL> startup
ORACLE instance started.
Total System Global Area 2147483648 bytes
Fixed Size                  8794848 bytes
Variable Size            1912605984 bytes
Database Buffers          218103808 bytes
Redo Buffers                7979008 bytes
Database mounted.
Database opened.
Verify the change
SQL> show parameter unique
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_unique_name                       string      TST1TP

Remove the DB configuration from crs repository
$ srvctl remove database  -d TST1T -f
Add the DB resource Configuration to CRS repository
$ srvctl add database -db TST1TP -oraclehome /u01/dbatst1/12.2.0.1/dbp1 -spfile /u01/dbatst1/12.2.0.1/dbp1/dbs/spfileTST1T.ora

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