How to Unregister a Database in Oracle RMAN
The Oracle RMAN utility lets you control the database for your server using a command-line utility. Some administrators prefer a command-line utility instead of using a graphical interface, because the command line is faster. The command line does not have a confirmation process, so the commands you type are carried out immediately. When you "unregister" a database, you remove the database from the list of recovery catalog services for your data farm.
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Instructions
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Open the RMAN utility on the database server or on a desktop computer that has a connection to the database.
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Log in to the database as an administrator and type the following command,
replacing "test1" with the database you want to remove and "catdb" with the database catalog from which you want to remove it to set up the target database:rman TARGET SYS/oracle@test1 CATALOG rman/rman@catdb
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Type the following command to remove registration for the target Oracle database without being prompted for verification:
UNREGISTER DATABASE NOPROMPT;
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