rman question

[LKBrwn_DBA]

... Should I just take a full rman backup and forget about the archivelogs ? If so, how do I get rid of the archivelogs after the full backup ?

Yes, take full backup of database and archivelogs, something like this:

RUN
{
  ALLOCATE CHANNEL ch1 DEVICE TYPE DISK;
  ALLOCATE CHANNEL ch2 DEVICE TYPE DISK;
  ALLOCATE CHANNEL ch3 DEVICE TYPE DISK;
  ALLOCATE CHANNEL ch4 DEVICE TYPE DISK;
  BACKUP AS COMPRESSED BACKUPSET
    DATABASE
    FORMAT = 'F:\orabackup\ORCL\%d_%t_%s_%U.bkp'
    INCLUDE CURRENT CONTROLFILE
    PLUS ARCHIVELOG DELETE INPUT;
}

If after this, there still remain old archive logs, you can remove them with these commands:

ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK;
CHANGE ARCHIVELOG ALL CROSSCHECK;
DELETE NOPROMPT EXPIRED BACKUP DEVICE TYPE DISK;
DELETE NOPROMPT OBSOLETE;