ORA-12315

Error: ORA-12315: database link type is invalid for the ALTER DATABASE statement

Causa: The database link name you specified on the ALTER DATABASE statement is not an ROM: link. You must specify an ROM: link when using the ALTER DATABASE statement to mount or open a secondary database.

Acción: Re-issue the ALTER DATABASE statement using a valid ROM: link to the database you want to mount or open. If a valid ROM: link does not exist, create one using the CREATE DATABASE LINK statement. See your documentation for Oracle security-related products for more information about creating database links using the ROM: link type.