select flashback_on from v$database;
FLASHBACK_ON
------------------
NO
(3)开启闪回
a.开启归档
b.设置闪回区
alter system set db_recovery_file_dest='/home/U01/app/oracle/fast_recovery_area' scope=both;
System altered.
SQL> alter system set db_recovery_file_dest_size=60G scope=both;
System altered.
SQL> alter system set db_flashback_retention_target=4320 scope=both;
System altered.
c.开启flashback (10g在mount开启)
alter database flashback on;
Database altered.
(4)确定闪回开启
select flashback_on from v$database;
FLASHBACK_ON
------------------
YES
select * from scott.dept;
DEPTNO DNAME LOC
---------- -------------- -------------
ACCOUNTING NEW YORK
RESEARCH DALLAS
SALES CHICAGO
OPERATIONS BOSTON
SQL> delete from scott.dept where deptno=40;
row deleted.
SQL> commit;
Commit complete.
SQL> select * from scott.dept as of timestamp sysdate-10/1440;
DEPTNO DNAME LOC
ACCOUNTING NEW YORK
RESEARCH DALLAS
SALES CHICAGO
OPERATIONS BOSTON
SQL> select * from scott.dept as of timestamp to_timestamp('2017-12-14 16:20:00','yyyy-mm-dd hh24:mi:ss');
DEPTNO DNAME LOC
ACCOUNTING NEW YORK
RESEARCH DALLAS
SALES CHICAGO
OPERATIONS BOSTON
SQL> select * from scott.dept as of scn 16801523;
DEPTNO DNAME LOC
ACCOUNTING NEW YORK
RESEARCH DALLAS
SALES CHICAGO
OPERATIONS BOSTON
flashback table scott.dept to timestamp to_timestamp('2017-12-14 16:20:00','yyyy-mm-dd hh24:mi:ss');
flashback table scott.dept to timestamp to_timestamp('2017-12-14 16:20:00','yyyy-mm-dd hh24:mi:ss')
ERROR at line 1:
ORA-08189: cannot flashback the table because row movement is not enabled
SQL> select row_movement from dba_tables where table_name='DEPT' and owner='SCOTT';
ROW_MOVE
DISABLED
SQL> alter table scott.dept enable row movement;
Table altered.
SQL> flashback table scott.dept to timestamp to_timestamp('2017-12-14 16:20:00','yyyy-mm-dd hh24:mi:ss');
Flashback complete.
SQL> select * from scott.dept;
DEPTNO DNAME LOC
ACCOUNTING NEW YORK
RESEARCH DALLAS
SALES CHICAGO
OPERATIONS BOSTON
SQL> alter table scott.dept disable row movement;
Table altered.
不支持sys/system用户表空间对象，可通过alter system set recyclebin=off;关闭回收站功能
闪回DROP示例：
select * from t ;
ID NAME
2
4
SQL> drop table t;
Table dropped.
SQL> show recyclebin;
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
T BIN$YEh2QcvZdJLgUxyAgQpnVQ==$0 TABLE 2017-12-14:15:02:06
SQL> flashback table t to before drop;
Flashback complete.
SQL> select * from t;
ID NAME
2
4
备注：即使不开始flashback，只要开启了recyclebin，那么就可以闪回DROP表。
但如果连续覆盖，就需要指定恢复的表名，如果已经存在表，则需要恢复重命名。
show recyclebin;
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
---------------- ------------------------------ ------------ -------------------
T BIN$YEh2QcvddJLgUxyAgQpnVQ==$0 TABLE 2017-12-14:15:07:54
T BIN$YEh2QcvcdJLgUxyAgQpnVQ==$0 TABLE 2017-12-14:15:07:27
SQL> flashback table "BIN$YEh2QcvcdJLgUxyAgQpnVQ==$0" to before drop ;
Flashback complete.
SQL> show recyclebin;
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
---------------- ------------------------------ ------------ -------------------
T BIN$YEh2QcvddJLgUxyAgQpnVQ==$0 TABLE 2017-12-14:15:07:54
SQL> flashback table t to before drop rename to tt;
Flashback complete.
由 dawei