OceanBase 支持回收站功能，通过回收站可以闪回已删除的表。默认回收站是开启的，回收站是否开启由租户变量 recyclebin 控制。

    开启/关闭回收站的语法是：

    1. set global recyclebin = ON | OFF ;

    修改回收站的开启状态后，只对后续新连接会话生效。

    • 示例：闪回被删除的表。
    1. obclient> drop table if exists t1;
    2. obclient> create table t1(id bigint not null primary key, gmt_create datetime not null default current_timestamp);
    3. Query OK, 0 rows affected (0.09 sec)
    5. obclient> insert into t1(id) values(1),(2),(3);
    6. Query OK, 3 rows affected (0.02 sec)
    7. Records: 3  Duplicates: 0  Warnings: 0
    9. obclient> select * from t1;
    10. +----+---------------------+
    11. | ID | GMT_CREATE          |
    12. +----+---------------------+
    13. |  1 | 2020-02-28 09:47:07 |
    14. |  2 | 2020-02-28 09:47:07 |
    15. |  3 | 2020-02-28 09:47:07 |
    16. +----+---------------------+
    17. 3 rows in set (0.00 sec)
    19. obclient> drop table t1;
    20. Query OK, 0 rows affected (0.03 sec)
    22. obclient> show recyclebin;
    23. *************************** 1. row ***************************
    24.   OBJECT_NAME: __recycle_$_20200102_1585650066255592
    25. ORIGINAL_NAME: t1
    26.          TYPE: TABLE
    27.    CREATETIME: 2020-03-31 18:21:06.255716
    28. 1 row in set (0.03 sec)
    30. obclient> flashback table __recycle_$_20200102_1585650066255592 to before drop rename to t1;
    31. Query OK, 0 rows affected (0.02 sec)
    33. obclient> select * from t1;
    34. +----+---------------------+
    35. | ID | GMT_CREATE          |
    36. +----+---------------------+
    37. |  1 | 2020-02-28 09:47:07 |
    38. |  2 | 2020-02-28 09:47:07 |
    39. |  3 | 2020-02-28 09:47:07 |
    40. +----+---------------------+