前提：
- Standby Database Must be in Flashback database mode. - Time at which Drop/Truncate/Delete Table happened should be within the db_flashback_retention_target and all the flashback and archive logs should be available
在dataguard備庫上找回在主庫上被錯誤的Drop/Truncate/Delete 掉的Table
參考文章：
How To Recover From A Drop/Truncate/Delete Table Done On Primary Using Flashback On A Standby Database (文檔 ID 958557.1)
主庫：
[oracle@hosta ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.1.0.7.0 - Production on Fri Jul 31 22:08:19 2015
Copyright (c) 1982, 2008, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select sysdate from dual;
SYSDATE
---------
31-JUL-15
SQL> show parameter format
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_format string %t_%s_%r.dbf
nls_date_format string
nls_time_format string
nls_time_tz_format string
nls_timestamp_format string
nls_timestamp_tz_format string
star_transformation_enabled string TRUE
SQL> alter session set NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS';
Session altered.
SQL> select sysdate from dual;
SYSDATE
-------------------
2015-07-31 22:10:00
SQL> select count(*) from scott.test_tab_1 ;
COUNT(*)
----------
2566
SQL> truncate scott.test_tab_1 ;
truncate scott.test_tab_1
*
ERROR at line 1:
ORA-03290: Invalid truncate command - missing CLUSTER or TABLE keyword
SQL> truncate table scott.test_tab_1 ;
Table truncated.
SQL>
備庫：
SQL> show parameter target
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
archive_lag_target integer 0
db_flashback_retention_target integer 1440 ------->默認的設置，1440分鐘，也就是一天。
fast_start_io_target integer 0
fast_start_mttr_target integer 0
memory_max_target big integer 356M
memory_target big integer 356M
pga_aggregate_target big integer 0
sga_target big integer 0
SQL> recover managed standby database cancel;
Media recovery complete.
SQL> shutdown immediate;
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 372449280 bytes
Fixed Size 1313484 bytes
Variable Size 322962740 bytes
Database Buffers 41943040 bytes
Redo Buffers 6230016 bytes
Database mounted.
SQL> flashback database to timestamp to_date('2015-07-31 22:10:00','YYYY-MM-DD HH24:MI:SS');
flashback database to timestamp to_date('2015-07-31 22:10:00','YYYY-MM-DD HH24:MI:SS')
*
ERROR at line 1:
ORA-01153: an incompatible media recovery is active
SQL> alter database recover managed standby database cancel;
Database altered.
SQL> flashback database to timestamp to_date('2015-07-31 22:10:00','YYYY-MM-DD HH24:MI:SS');
Flashback complete.
SQL> alter database open read only;
Database altered.
SQL> select count(*) from scott.test_tab_1 ;
COUNT(*)
----------
2566
SQL> exit
[oracle@hostb SBDB1]$ export NLS_LANG=american_america.AL32UTF8
[oracle@hostb SBDB1]$ exp system/oracle file=/home/oracle/test_tab_exp_0730.dmp tables=scott.test_tab_1
Export: Release 11.1.0.7.0 - Production on Fri Jul 31 22:20:03 2015
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in AL32UTF8 character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
Current user changed to SCOTT
. . exporting table TEST_TAB_1 2566 rows exported
Export terminated successfully without warnings.
[oracle@hostb SBDB1]$
備庫：
[oracle@hostb SBDB1]$ sqlplus / as sysdba
SQL*Plus: Release 11.1.0.7.0 - Production on Fri Jul 31 22:26:46 2015
Copyright (c) 1982, 2008, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 372449280 bytes
Fixed Size 1313484 bytes
Variable Size 322962740 bytes
Database Buffers 41943040 bytes
Redo Buffers 6230016 bytes
Database mounted.
SQL> recover standby database;
ORA-00279: change 1156098 generated at 07/31/2015 22:10:03 needed for thread 1
ORA-00289: suggestion : /home/oracle/archive/SBDB1/1_100_884907736.dbf
ORA-00280: change 1156098 for thread 1 is in sequence #100
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
AUTO
ORA-00279: change 1156325 generated at 07/31/2015 22:14:44 needed for thread 1
ORA-00289: suggestion : /home/oracle/archive/SBDB1/1_101_884907736.dbf
ORA-00280: change 1156325 for thread 1 is in sequence #101
ORA-00278: log file '/home/oracle/archive/SBDB1/1_100_884907736.dbf' no longer
needed for this recovery
ORA-00279: change 1156336 generated at 07/31/2015 22:15:03 needed for thread 1
ORA-00289: suggestion : /home/oracle/archive/SBDB1/1_102_884907736.dbf
ORA-00280: change 1156336 for thread 1 is in sequence #102
ORA-00278: log file '/home/oracle/archive/SBDB1/1_101_884907736.dbf' no longer
needed for this recovery
ORA-00279: change 1156346 generated at 07/31/2015 22:15:13 needed for thread 1
ORA-00289: suggestion : /home/oracle/archive/SBDB1/1_103_884907736.dbf
ORA-00280: change 1156346 for thread 1 is in sequence #103
ORA-00278: log file '/home/oracle/archive/SBDB1/1_102_884907736.dbf' no longer
needed for this recovery
ORA-00308: cannot open archived log
'/home/oracle/archive/SBDB1/1_103_884907736.dbf'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
SQL> alter database recover managed standby database disconnect from session;
alter database recover managed standby database disconnect from session
*
ERROR at line 1:
ORA-01153: an incompatible media recovery is active
SQL> alter database recover managed standby database cancel;
Database altered.
SQL> alter database recover managed standby database using current logfile disconnect from session;
Database altered.
SQL>
