SQL> alter database add logfile group 3 ('/oracle9i/app/oracle/admin/db06/Log/lg5.rdo','/oracle9i/app/oracle/admin/db06/Backup/lg6.rdo') size 64k;

Database altered.

SQL> ed
Wrote file afiedt.buf

1* alter database add logfile group 4 ('/oracle9i/app/oracle/admin/db06/Log/lg7.rdo','/oracle9i/app/oracle/admin/db06/Backup/lg8.rdo') size 49k
SQL> /

Database altered.

SQL> ed
Wrote file afiedt.buf

1* alter database add logfile group 5 ('/oracle9i/app/oracle/admin/db06/Log/lg9.rdo','/oracle9i/app/oracle/admin/db06/Backup/lg10.rdo') size 24k
SQL> /

Database altered.
SQL> ed
Wrote file afiedt.buf

1* alter database add logfile group 5 ('/oracle9i/app/oracle/admin/db06/Log/lg16.rdo','/oracle9i/app/oracle/admin/db06/Backup/lg15.rdo') size 2k
SQL> /

Database altered.