Control file backup with RMAN is not proccedding further

when I try to execute command

RMAN> run {

2> SQL 'alter system archive log current';

3> backup current controlfile;

4> SQL 'alter database backup controlfile to trace';

5> }

it is starting and giving message

sql statement: alter system archive log current

Starting backup at 26-MAY-15

allocated channel: ORA_DISK_1

channel ORA_DISK_1: sid=248 devtype=DISK

channel ORA_DISK_1: starting full datafile backupset

channel ORA_DISK_1: specifying datafile(s) in backupset

including current controlfile in backupset

channel ORA_DISK_1: starting piece 1 at 26-MAY-15

channel ORA_DISK_1: finished piece 1 at 26-MAY-15

piece handle=/dbsav/KFXVPRD/rman_back/gaq7s2ce_1_1 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03