Flashback base on Time and Sequence

Flashback Manager
1)theory
1@@@@theory and relative v$ view.
@@@modify the date formate.
[oracle@station3 ~]$ vim .bash_profile
export NLS_DATE_FORMAT="yyyy-mm-dd hh24:mi:ss"
[oracle@station3 ~]$ . .bash_profile
SQL> select sysdate from dual ;
SYSDATE
-------------------
2011-11-23 14:36:38
 
@@@
SQL> select table_name from dict where table_name like '%FLASH%';
 
@@@
@@@v$flashback_database_log
@@@
SQL> select OLDEST_FLASHBACK_SCN,OLDEST_FLASHBACK_TIME from v$flashback_database_log;
OLDEST_FLASHBACK_SCN OLDEST_FLASHBACK_TI
-------------------- -------------------
              747014 2011-11-23 14:10:04
 
@@@
@@@v$flashback_database_stat
@@@
SQL>  select BEGIN_TIME,END_TIME,FLASHBACK_DATA,DB_DATA,REDO_DATA from 
v$flashback_database_stat;
BEGIN_TIME          END_TIME            FLASHBACK_DATA    DB_DATA  REDO_DATA
------------------- ------------------- -------------- ---------- ----------
2011-11-23 14:10:04 2011-11-23 14:40:25        3301376    5120000    2694144
 
@@@
@@@v$undostat
@@@
@@@obviously,record the data every 10 minutes.
SQL> select BEGIN_TIME,END_TIME,UNDOTSN,UNDOBLKS from  v$undostat;
BEGIN_TIME          END_TIME               UNDOTSN   UNDOBLKS
------------------- ------------------- ---------- ----------
2011-11-23 14:49:36 2011-11-23 14:52:51          1          2
2011-11-23 14:39:36 2011-11-23 14:49:36          1         28
2011-11-23 14:29:36 2011-11-23 14:39:36          1         31
2011-11-23 14:19:36 2011-11-23 14:29:36          1         16
2011-11-23 14:09:36 2011-11-23 14:19:36          1         78
 
@@@
@@@V$FLASHBACK_DATABASE_LOGFILE
@@@
SQL> select * from V$FLASHBACK_DATABASE_LOGFILE;
NAME
--------------------------------------------------------------------------------
      LOG#    THREAD#  SEQUENCE#      BYTES FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ------------- -------------------
/u01/app/oracle/flash_recovery_area/ORCL/flashback/o1_mf_7ds3kvlm_.flb
         1          1          1    8192000        747648 2011-11-23 14:10:04
 
 
2)flashback using sequence
1@@@@prepare
@@@rman recovery to sequence is including
@@@create a test table.
SQL> conn hr/hr
SQL> create table test_squence(a number); 
Table created.
SQL> insert into test_squence values(1); 
1 row created.
SQL> commit;
Commit complete.
SQL> conn /as sysdba; 
Connected.
SQL> archive log list ; 
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     22
Next log sequence to archive   26
Current log sequence           26   @@@in using.
SQL> alter system switch logfile ;  @@@LGWR archive 26
System altered.
 
@@@
SQL>  truncate table hr.test_squence;
Table truncated.
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     23
Next log sequence to archive   27
Current log sequence           27    @@@in using.
SQL> alter system switch logfile ;   @@@LGWR archive 27
System altered.
@@@if recovery to sequence 27,the table is missing,
@@@if recovery to sequence 26,the table exist.
 
2@@@@begin
SQL> shutdown immediate 
SQL> startup mount 
[oracle@station3 admin]$ rman target /
RMAN> flashback database to sequence 26 thread 1 ;
RMAN> sql "alter database open read only"  @@@to check
SQL> select * from test_squence;
         A
----------
         1
@@@only if you haven't resetlogs,flashback continue.
SQL> shutdown immediate ;
SQL> startup mount;
RMAN> flashback database to sequence 27 thread 1; 
RMAN> alter database open resetlogs;
RMAN> list incarnation of database; 
List of Database Incarnations
DB Key  Inc Key DB Name  DB ID            STATUS  Reset SCN  Reset Time
------- ------- -------- ---------------- --- ---------- ----------
1       1       ORCL     1289234111       PARENT  1          2005-06-30 19:09:40
2       2       ORCL     1289234111       PARENT  446075     2011-09-10 02:49:38
3       3       ORCL     1289234111       CURRENT 752156     2011-11-23 15:32:24