Experience: is what you get soon after you need it.
My Cloud Certifications:
AWS Certified Solutions Architect Associate
Oracle Cloud Infrastructure 2018 Certified Architect Associate.
Oracle Cloud Infrastructure Classic 2018 Certified Architect Associate.
Oracle Database Cloud Administrator Certified Professional.
Oracle Database Cloud Service Operations Certified Associate.
Monday, December 6, 2010
If the target database already deleted/dropped/decommissioned or not available
Then in 9i/10g
SQL> alter session set current_schema=RCAT10G_OTH;
SQL> execute dbms_rcvcat.unregisterdatabase(1,129982387);
PL/SQL procedure successfully completed.
If Target database is available and UP, Then in 10g
rman>connect target id/pwd@dbname
rman>connect catalog id/pwd@catalogdb
RMAN> UNREGISTER DATABASE ;