flashback drop 误删除的表后的恢复及对回收站中表的操作
1.误删除表，使用flashback drop功能找回

SQL> select * from tab;

TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
TEST TABLE
SQL> select * from test;
A
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0.
SQL> show parameter recyclebin; -验证回收站是否打开--如未打开不能使用闪回DROP--11G默认打开
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
recyclebin string on
SQL> show recyclebin;
SQL> drop table test;
Table dropped.
查询回收站，删除的表在里面，并被系统自己命令--BIN$开头一长串---从ORIGINAL NAME 列可以看到表的原名是test
SQL> show recyclebin;
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
---------------- ------------------------------ ------------ -------------------
TEST BIN$387tHPzSqO/gQKjA3QEnzg==$0 TABLE 2013-06-23:17:29:01
SQL> select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------

BIN$387tHPzSqO/gQKjA3QEnzg==$0 TABLE

使用回收站中的BIN$的表名也能查询到表中数据

SQL> select * from "BIN$387tHPzSqO/gQKjA3QEnzg==$0";
A
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0

执行闪回删除表的命令并查询数据是否完整：

SQL> flashback table test to before drop;
Flashback complete.
SQL> select * from "BIN$387tHPzSqO/gQKjA3QEnzg==$0";
select * from "BIN$387tHPzSqO/gQKjA3QEnzg==$0"
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
TEST TABLE
SQL> select * from test;
A
----------
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0

2.闪回删除并将表重命名

BYS@bys1>select * from test5;
ID NAME
---------- ----------
2 b
BYS@bys1>drop table test5;
Table dropped.

BYS@bys1>flashback table test5 to before drop rename to test6;
Flashback complete.
BYS@bys1>select * from test6;
ID NAME
---------- ----------
2 b

3.回收站内查看删除的表，单个删除回收站里的表、全部清空回收站。

SQL> create table test2 as select * fromtest1;

表已创建。

SQL> insert into test2values('00002','baishan2');

已创建 1 行。

SQL> select * from test2;

ID NAME

----- ----------

00001 baishan

00002 baishan2

SQL> show recyclebin

SQL> drop table test1;

表已删除。

删除表后查看回收站里，可以看到删除的表名，及删除时间

SQL> showrecyclebin

ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME

---------------------------------------------- ------------ -------------------

TEST1 BIN$kUfBJ3qcTSiLxqU6hmoEcw==$0TABLE 2013-02-10:12:17:11

SQL> select * from cat;

TABLE_NAME TABLE_TYPE

------------------------------ -----------

BIN$kUfBJ3qcTSiLxqU6hmoEcw==$0 TABLE

TEST TABLE

TEST2 TABLE

SQL> create table test3 as select * fromtest2;

表已创建。

SQL> select * from cat;

TABLE_NAME TABLE_TYPE

------------------------------ -----------

BIN$kUfBJ3qcTSiLxqU6hmoEcw==$0 TABLE

TEST TABLE

TEST2 TABLE

TEST3 TABLE

DROP时使用purge参数删除的表被直接删除，不存放在回收站。

SQL> drop table test2 purge;

表已删除。

SQL> show recyclebin

ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME

---------------------------------------------- ------------ -------------------

TEST1 BIN$kUfBJ3qcTSiLxqU6hmoEcw==$0TABLE 2013-02-10:12:17:11

清空回收站

SQL> purge recyclebin;

回收站已清空。

SQL> drop table test2;

表已删除。

SQL> show recyclebin

ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME

---------------------------------------------- ------------ -------------------

TEST2 BIN$UabVC8wiRx+GdsN4VT5bRw==$0TABLE 2013-02-12:17:10:46

SQL> drop table test3;

表已删除。

SQL> show recyclebin

ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME

---------------------------------------------- ------------ -------------------

TEST2 BIN$UabVC8wiRx+GdsN4VT5bRw==$0TABLE 2013-02-12:17:10:46

TEST3 BIN$n8CZgrwoSRO16TFB/dXOcA==$0TABLE 2013-02-12:17:11:35

清除回收站中的test2表。

SQL> purge tabletest2;

表已清除。

SQL> show recyclebin

ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME

---------------------------------------------- ------------ -------------------

TEST3 BIN$n8CZgrwoSRO16TFB/dXOcA==$0TABLE 2013-02-12:17:11:35

SQL> flashback table test3 to before drop;

闪回完成。

SQL> show recyclebin

SQL> select count(*) from test3;

COUNT(*)

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