you have four options to solve this ORA-19815 case,just work as follow
You have the following choices to free up space from flash recovery area:
1. Consider changing your RMAN retention policy.If you are using dataguard, then consider changing yourRMAN archivelog deletion policy.
2. Backup files to tertiary device such as tape using the RMAN command BACKUP RECOVERY AREA.
3. Add disk space and increase the db_recovery_file_dest_size parameter to reflect the new space.
4. Delete unncessary files using the RMAN DELETE command.If an OS command was used to delete files, then use RMAN CROSSCHECK and DELETE EXPIRED commands.
来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/27038344/viewspace-734897/，如需转载，请注明出处，否则将追究法律责任。