Our company currently runs the databases on RAC (Oracle 11gR2). We generally take the full backup of databases everyday using the datapump. My issues here is I am unable to delete the dump files older that 3 days using the below script
Also, this is not an Oracle-related problem, it is a user problem as the user does not understand scripting or how to use google or man pages.
Next, a datapump export is NOT a backup that could ever be used to actually restore a working database for a PITR. Unless you are doing RMAN, your ability to actually have a usable database after a crash is severely limited. I would nver use this as a "backup" solution.