问题描述：oracle数据库中删除表后创建同名表，如何闪回删除后的表？
数据库：oracle 11.2.0.4 64位
系统：centos 7.9 64位
1、模拟异常
SQL> select count(*) from test;

  COUNT(*)
----------
    256000

SQL> select object_name,original_name,operation,type from user_recyclebin;

no rows selected

SQL> drop table test;

Table dropped.

SQL> set line 200
SQL> col type for a15
SQL> select object_name,original_name,operation,type from user_recyclebin

OBJECT_NAME                    ORIGINAL_NAME                    OPERATION TYPE
------------------------------ -------------------------------- --------- ---------------
BIN$7LGIbMiPDmXgU9mFqMA7vQ==$0 TEST                             DROP      TABLE
创建同名表.
SQL> create table test (id number(6,2),
  2                     name varchar2(20));

Table created.

SQL> begin 
  2    for i in 1..20 loop
  3    insert into test values (i,'a' || i);
  4    end loop;
  5  end;
  6  /

PL/SQL procedure successfully completed.

SQL> select count(*) from test;

  COUNT(*)
----------
        20

SQL> commit;

Commit complete.

SQL> select object_name,original_name,operation,type from user_recyclebin;

OBJECT_NAME                    ORIGINAL_NAME                    OPERATION TYPE
------------------------------ -------------------------------- --------- ---------------
BIN$7LGIbMiPDmXgU9mFqMA7vQ==$0 TEST                             DROP      TABLE

SQL> flashback table test to before drop;
flashback table test to before drop
*
ERROR at line 1:
ORA-38312: original name is used by an existing object
说明：如上所示，闪回表时出现ORA-38312告警.
2、解决方案
2.1、指定新表名
SQL> flashback table test to before drop rename to test01;

Flashback complete.

SQL> select count(*) from test01;

  COUNT(*)
----------
    256000

SQL> select table_name from user_tables;

TABLE_NAME
------------------------------
TEST
TEST01
2.2、rename新表
SQL> drop table test;

Table dropped.

SQL> create table test (id number(6,2),
  2                     name varchar2(20));

Table created.

SQL> begin 
  2    for i in 1..20 loop
  3    insert into test values (i,'a' || i);
  4    end loop;
  5  end;
  6  /

PL/SQL procedure successfully completed.

SQL> commit;

Commit complete.

SQL> select table_name from user_tables;

TABLE_NAME
------------------------------
TEST
TEST01
对表test重新命令为其它表名.
SQL> alter table test rename to test02;

Table altered.

SQL> select object_name,original_name,operation,type from user_recyclebin;

OBJECT_NAME                    ORIGINAL_NAME                    OPERATION TYPE
------------------------------ -------------------------------- --------- ---------------
BIN$7LGIbMiQDmXgU9mFqMA7vQ==$0 TEST                             DROP      TABLE

SQL> flashback table test to before drop;

Flashback complete.

SQL> select table_name from user_tables;

TABLE_NAME
------------------------------
TEST02
TEST
TEST01