Oracle闪回表基本操作

1.查看oracle回收站并且做闪回操作
SQL>select * from dba_recyclebin
SQL>flashback table emp01 to before drop;
Flashback complete.

2.做闪回操作并且对表重新命名
SQL>flashback table “BIN$JLbmbfKW6YPgUKjAtQYUKQ==$0" to before drop rename to emp02;
Flashback complete.

3.闪回表，并查看表上某列的索引是否闪回
SQL> create index ind_empno on emp02(empno);
Index created.

SQL> select index_name from user_indexes;
INDEX_NAME
------------------------------
IND_EMPNO
PK_DEPT

SQL> drop table emp02;
Table dropped.

SQL> flashback table emp02 to before drop;
Flashback complete.

SQL> select index_name from user_indexes;
INDEX_NAME
------------------------------
BIN$JLbmbfKX6YPgUKjAtQYUKQ==$0        //索引闪回了，但是名字是回收站的名字
PK_DEPT

SQL> drop index "BIN$JLbmbfKX6YPgUKjAtQYUKQ==$0";      //删除索引，记得加引号
Index dropped.

SQL> create index ind_empno on emp02(empno);            //重建索引
Index created.

SQL> select index_name from user_indexes;
INDEX_NAME
------------------------------
IND_EMPNO
PK_DEPT

4.恢复多个同名的表
SQL> drop table emp02;
Table dropped.

SQL> create table emp02 as select * from emp;
Table created.

SQL> drop table emp02;
Table dropped.

SQL> flashback table emp02 to before drop;
Flashback complete.

SQL> flashback table emp02 to before drop;
flashback table emp02 to before drop
*
ERROR at line 1:
ORA-38312: original name is used by an existing object

SQL> flashback table "BIN$JLbmbfKa6YPgUKjAtQYUKQ==$0" to before drop rename to emp03;
Flashback complete.

5.purge的基本应用
SQL> drop table emp04 purge;
Table dropped.

SQL> drop table emp03;
Table dropped.

SQL> drop table emp02;
Table dropped.

SQL> purge table emp02;
Table purged.

SQL> purge table "BIN$JLbmbfKd6YPgUKjAtQYUKQ==$0";
Table purged.

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