ORA-12315
        database link type is invalid for the ALTER DATABASE statement
        
        
        Cause
        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.
        Action
        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 command.  See the Trusted ORACLE RDBMS Guide to Security Features for more information about creating database links using the ROM: link type.
        
     
    
    
        ORA-12315
        database link type is invalid for the ALTER DATABASE statement
        
        
        Cause
        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.
        Action
        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 command.  See the Trusted ORACLE RDBMS Guide to Security Features for more information about creating database links using the ROM: link type.
        
     
    
    
        ORA-12315
        database link type is invalid for the ALTER DATABASE statement
        
        
        Cause
        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.
        Action
        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 command.  See the Trusted ORACLE RDBMS Guide to Security Features for more information about creating database links using the ROM: link type.