Oracle rman incomplete recovery

RMAN> run{
 allocate channel c1 type disk;
 allocate channel c2 type disk;
 allocate channel c3 type disk;
 set until time "to_date('2010-12-02:02:48:49','yyyy-mm-dd:hh24:mi:ss')" ;(否则需要设置env )
 restore database;
 recover database;
 alter database open resetlogs;
 }