RMAN恢复drop purge的表

@ORA12C>  alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
Session altered.
SYS@ORA12C> create table  t_0920 as select * from dba_objects;
Table created.
SYS@ORA12C> select count(*) from t_0920;
COUNT(*)
-----------------
91691
1 row selected.
SYS@ORA12C> select sysdate from dual;
SYSDATE
-------------------
2015-09-20 14:17:49
1 row selected.
SYS@ORA12C> drop table t_0920 purge;
Table dropped.
SYS@ORA12C> desc t_0920;
ERROR:
ORA-04043: object t_0920 does not exist
SYS@ORA12C> create table t_09201 as select * from dba_objects;
Table created.
SYS@ORA12C> select count(*) from t_09201;
COUNT(*)
-----------------
91691
1 row selected.
SYS@ORA12C> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SYS@ORA12C> startup mount;
ORACLE instance started.
Total System Global Area  729808896 bytes
Fixed Size      2928680 bytes
Variable Size    570429400 bytes
Database Buffers   150994944 bytes
Redo Buffers      5455872 bytes
Database mounted.

run{
sql "alter session set nls_date_format=''yyyy-mm-dd hh24:mi:ss''";
set until time '2015-09-20 14:17:49';
restore database;
recover database;
6> }
using target database control file instead of recovery catalog
sql statement: alter session set nls_date_format=''yyyy-mm-dd hh24:mi:ss''
executing command: SET until clause
Starting restore at 20-SEP-15
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=355 device type=DISK
creating datafile file number=2 name=/u01/app/oracle/oradata/ORA12C/t2.dbf
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/ORA12C/system01.dbf
channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/ORA12C/sysaux01.dbf
channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/ORA12C/undotbs01.dbf
channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/ORA12C/example01.dbf
channel ORA_DISK_1: restoring datafile 00006 to /u01/app/oracle/oradata/ORA12C/users01.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/oracle/fast_recovery_area/ORA12C/backupset/2015_09_20/o1_mf_nnndf_TAG20150920T120820_bzwd9ntd_.bkp
channel ORA_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/ORA12C/backupset/2015_09_20/o1_mf_nnndf_TAG20150920T120820_bzwd9ntd_.bkp tag=TAG20150920T120820
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:01:56
Finished restore at 20-SEP-15
Starting recover at 20-SEP-15
using channel ORA_DISK_1
starting media recovery
archived log for thread 1 with sequence 18 is already on disk as file /u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_18_bzwh058r_.arc
archived log for thread 1 with sequence 19 is already on disk as file /u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_19_bzwhh50d_.arc
archived log for thread 1 with sequence 20 is already on disk as file /u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_20_bzwhzsts_.arc
archived log for thread 1 with sequence 1 is already on disk as file /u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_1_bzwmprks_.arc
archived log file name=/u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_18_bzwh058r_.arc thread=1 sequence=18
archived log file name=/u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_19_bzwhh50d_.arc thread=1 sequence=19
archived log file name=/u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_20_bzwhzsts_.arc thread=1 sequence=20
archived log file name=/u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_1_bzwm5k1c_.arc thread=1 sequence=1
archived log file name=/u01/app/oracle/fast_recovery_area/ORA12C/archivelog/2015_09_20/o1_mf_1_1_bzwmprks_.arc thread=1 sequence=1
media recovery complete, elapsed time: 00:00:07
Finished recover at 20-SEP-15
RMAN> alter database open resetlogs;
Statement processed

SYS@ORA12C> select count(*) from t_0920;
COUNT(*)
-----------------
91691
1 row selected.
SYS@ORA12C> select count(*) from t_09201;
select count(*) from t_09201
*
ERROR at line 1:
ORA-00942: table or view does not exist