I tried starting up my instance and received the error ORA-19802. Cannot use
db_recovery_file_dest_size. How can I resolve the problem?
Answer here: https://community.oracle.com/thread/2203255
You can always export, edit and import a pfile, even when the instance won't start like this:
SQL> create pfile = '/tmp/pfile' from spfile='+DATA/rac/spfilerac.ora';
edit the pfile with the text editor of your choice and import back:
SQL> create spfile='+DATA/rac/spfilerac.ora' from pfile='/tmp/pfile';**