Oracle rman backups

type:backup set, image copy
backup set ->backup piece
backup control file 4 methods: 
 auto
 backup current controlfile
 backup datafile include current controlfile
 sql "alter database backup control file to ''/tmp/ctl'' "
backup spfile:
the same as datafile tablespace
backup archived log
 
image copies: os copy command,
copy | backup as copy
 
incremental backups: 0-4 level differential backup level n |cumulative backup level n-1
backup up increment level n {cumulative} database|datafile|tablespace
 
alter database enable block change tracking using file ''
 
 
 
v$archived_log
v$bakcup_corruption
v$copy_corruption
v$datavase_block_corruption
v$backup_datafile
v$backup_redolog
v$backup_set
v$backup_piece