闪回DROP/TRUNCATE

背景信息

闪回DROP：可以恢复意外删除的表，从回收站（recyclebin）中恢复被删除的表及其附属结构如索引、表约束等。闪回drop是基于回收站机制，通过还原回收站中记录的表的物理文件，实现已drop表的恢复。
闪回TRUNCATE：可以恢复误操作或意外被进行truncate的表，从回收站中恢复被truncate的表及索引的物理数据。闪回truncate基于回收站机制，通过还原回收站中记录的表的物理文件，实现已truncate表的恢复。

前提条件

开启enable_recyclebin参数（GUC参数在postgresql.conf文件修改），启用回收站，请联系管理员修改。
recyclebin_retention_time参数用于设置回收站对象保留时间，超过该时间的回收站对象将被自动清理，请联系管理员修改。

参数说明

DROP/TRUNCATE TABLE table_name PURGE
- 默认将表数据放入回收站中，PURGE直接清理。

PURGE RECYCLEBIN
- 表示清理回收站对象。
TO BEFORE DROP
使用这个子句检索回收站中已删除的表及其子对象。
可以指定原始用户指定的表的名称，或对象删除时数据库分配的系统生成名称。
- 回收站中系统生成的对象名称是唯一的。因此，如果指定系统生成名称，那么数据库检索指定的对象。使用“select * from gs_recyclebin;”语句查看回收站中的内容。
- 如果指定了用户指定的名称，且如果回收站中包含多个该名称的对象，然后数据库检索回收站中最近移动的对象。如果想要检索更早版本的表，你可以这样做：
  - 指定你想要检索的表的系统生成名称。
  - 执行TIMECAPSULE TABLE ... TO BEFORE DROP语句，直到你要检索的表。
- 恢复DROP表时，只恢复基表名，其他子对象名均保持回收站对象名。用户可根据需要，执行DDL命令手工调整子对象名。
- 回收站对象不支持DML、DCL、DDL等写操作，不支持DQL查询操作（后续支持）。
- 闪回点和当前点之间，执行过修改表结构或影响物理结构的语句，闪回失败。执行过DDL的表进行闪回操作报错：“ERROR：The table definition of %s has been changed. ”。涉及namespace、表名改变等操作的DDL执行闪回操作报错： ERROR: recycle object %s desired does not exis；
- 开启enable_recyclebin参数，启用回收站时，如果表上有truncate trigger，TRUNCATE表时，无法触发trigger。
RENAME TO
为从回收站中检索的表指定一个新名称。
TO BEFORE TRUNCATE
闪回到TRUNCATE之前。

语法示例

-- PURGE TABLE table_name; -- 
--查看回收站
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)

gaussdb=# drop table if EXISTS flashtest;
NOTICE:  table "flashtest" does not exist, skipping
DROP TABLE
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)
--创建表flashtest
gaussdb=# create table if not EXISTS flashtest(id int, name text) with (storage_type = ustore);
NOTICE:  The 'DISTRIBUTE BY' clause is not specified. Using 'id' as the distribution column by default.
HINT:  Please use 'DISTRIBUTE BY' clause to specify suitable data distribution column.
CREATE TABLE
--插入数据
gaussdb=# insert into flashtest values(1, 'A');
INSERT 0 1
gaussdb=# select * from flashtest;
 id | name 
----+------
  1 | A
(1 row)
--DROP表flashtest
gaussdb=# drop table if EXISTS flashtest;
DROP TABLE
--查看回收站，删除的表被放入回收站
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid |           rcyname            |    rcyoriginname     | rcyoperation | rcytype | rcyrecyclecsn |        rcyrecycletime         | rcycreatecsn | rcychangecs
n | rcynamespace | rcyowner | rcytablespace | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+------------------------------+----------------------+--------------+---------+---------------+-------------------------------+--------------+------------
--+--------------+----------+---------------+----------------+---------------+-------------+--------------+----------------
     18591 |   12737 |    18585 | BIN$31C14EB4899$9737$0==$0   | flashtest            | d            |       0 |      79352606 | 2023-09-13 20:01:28.640664+08 |     79352595 |     7935259
5 |         2200 |       10 |             0 |          18585 | t             | t           | 225492       |         225492
     18591 |   12737 |    18590 | BIN$31C14EB489E$12D1B978==$0 | pg_toast_18585_index | d            |       3 |      79352606 | 2023-09-13 20:01:28.64093+08  |     79352595 |     7935259
5 |           99 |       10 |             0 |          18590 | f             | f           | 0            |              0
     18591 |   12737 |    18588 | BIN$31C14EB489C$12D1BF60==$0 | pg_toast_18585       | d            |       2 |      79352606 | 2023-09-13 20:01:28.641018+08 |            0 |            
0 |           99 |       10 |             0 |          18588 | f             | f           | 225492       |         225492
(3 rows)
--查看表flashtest，表不存在
gaussdb=# select * from flashtest;
ERROR:  relation "flashtest" does not exist
LINE 1: select * from flashtest;
                      ^
--PURGE表，将回收站中的表删除
gaussdb=# PURGE TABLE flashtest;
PURGE TABLE
--查看回收站，回收站中的表被删除
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)

-- PURGE INDEX index_name; --
gaussdb=# drop table if EXISTS flashtest;
NOTICE:  table "flashtest" does not exist, skipping
DROP TABLE
--创建表flashtest
gaussdb=# create table if not EXISTS flashtest(id int, name text) with (storage_type = ustore);
NOTICE:  The 'DISTRIBUTE BY' clause is not specified. Using 'id' as the distribution column by default.
HINT:  Please use 'DISTRIBUTE BY' clause to specify suitable data distribution column.
CREATE TABLE
--为表flashtest创建索引flashtest_index
gaussdb=# create index flashtest_index on flashtest(id);
CREATE INDEX
--查看flashtest表的基本信息
gaussdb=# \d+ flashtest
                       Table "public.flashtest"
 Column |  Type   | Modifiers | Storage  | Stats target | Description 
--------+---------+-----------+----------+--------------+-------------
 id     | integer |           | plain    |              | 
 name   | text    |           | extended |              | 
Indexes:
    "flashtest_index" ubtree (id) WITH (storage_type=USTORE) TABLESPACE pg_default
Has OIDs: no
Distribute By: HASH(id)
Location Nodes: ALL DATANODES
Options: orientation=row, storage_type=ustore, compression=no, toast.storage_type=ustore

--DROP表
gaussdb=# drop table if EXISTS flashtest;
DROP TABLE
--查看回收站
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid |           rcyname            |    rcyoriginname     | rcyoperation | rcytype | rcyrecyclecsn |        rcyrecycletime         | rcycreatecsn | rcychangecs
n | rcynamespace | rcyowner | rcytablespace | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+------------------------------+----------------------+--------------+---------+---------------+-------------------------------+--------------+------------
--+--------------+----------+---------------+----------------+---------------+-------------+--------------+----------------
     18648 |   12737 |    18641 | BIN$31C14EB48D1$9A85$0==$0   | flashtest            | d            |       0 |      79354509 | 2023-09-13 20:40:11.360638+08 |     79354506 |     7935450
8 |         2200 |       10 |             0 |          18641 | t             | t           | 226642       |         226642
     18648 |   12737 |    18646 | BIN$31C14EB48D6$12E230B8==$0 | pg_toast_18641_index | d            |       3 |      79354509 | 2023-09-13 20:40:11.361034+08 |     79354506 |     7935450
6 |           99 |       10 |             0 |          18646 | f             | f           | 0            |              0
     18648 |   12737 |    18644 | BIN$31C14EB48D4$12E236A0==$0 | pg_toast_18641       | d            |       2 |      79354509 | 2023-09-13 20:40:11.36112+08  |            0 |            
0 |           99 |       10 |             0 |          18644 | f             | f           | 226642       |         226642
     18648 |   12737 |    18647 | BIN$31C14EB48D7$9A85$0==$0   | flashtest_index      | d            |       1 |      79354509 | 2023-09-13 20:40:11.361246+08 |     79354508 |     7935450
8 |         2200 |       10 |             0 |          18647 | f             | t           | 0            |              0
(4 rows)

--PURGE索引flashtest_index
gaussdb=# PURGE index flashtest_index;
PURGE INDEX
--查看回收站，回收站中的索引flashtest_index被删除
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid |           rcyname            |    rcyoriginname     | rcyoperation | rcytype | rcyrecyclecsn |        rcyrecycletime         | rcycreatecsn | rcychangecs
n | rcynamespace | rcyowner | rcytablespace | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+------------------------------+----------------------+--------------+---------+---------------+-------------------------------+--------------+------------
--+--------------+----------+---------------+----------------+---------------+-------------+--------------+----------------
     18648 |   12737 |    18641 | BIN$31C14EB48D1$9A85$0==$0   | flashtest            | d            |       0 |      79354509 | 2023-09-13 20:40:11.360638+08 |     79354506 |     7935450
8 |         2200 |       10 |             0 |          18641 | t             | t           | 226642       |         226642
     18648 |   12737 |    18646 | BIN$31C14EB48D6$12E230B8==$0 | pg_toast_18641_index | d            |       3 |      79354509 | 2023-09-13 20:40:11.361034+08 |     79354506 |     7935450
6 |           99 |       10 |             0 |          18646 | f             | f           | 0            |              0
     18648 |   12737 |    18644 | BIN$31C14EB48D4$12E236A0==$0 | pg_toast_18641       | d            |       2 |      79354509 | 2023-09-13 20:40:11.36112+08  |            0 |            
0 |           99 |       10 |             0 |          18644 | f             | f           | 226642       |         226642
(3 rows)

-- PURGE RECYCLEBIN --
--PURGE回收站
gaussdb=# PURGE RECYCLEBIN;
PURGE RECYCLEBIN
--查看回收站，回收站被清空
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)

-- TIMECAPSULE TABLE { table_name } TO BEFORE DROP [RENAME TO new_tablename] --
gaussdb=# drop table if EXISTS flashtest;
NOTICE:  table "flashtest" does not exist, skipping
DROP TABLE
--创建表flashtest
gaussdb=# create table if not EXISTS flashtest(id int, name text) with (storage_type = ustore);
NOTICE:  The 'DISTRIBUTE BY' clause is not specified. Using 'id' as the distribution column by default.
HINT:  Please use 'DISTRIBUTE BY' clause to specify suitable data distribution column.
CREATE TABLE
--插入数据
gaussdb=# insert into flashtest values(1, 'A');
INSERT 0 1
gaussdb=# select * from flashtest;
 id | name 
----+------
  1 | A
(1 row)

--DROP表
gaussdb=# drop table if EXISTS flashtest;
DROP TABLE
--查看回收站，表被放入回收站
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid |           rcyname            |    rcyoriginname     | rcyoperation | rcytype | rcyrecyclecsn |        rcyrecycletime         | rcycreatecsn | rcychangecs
n | rcynamespace | rcyowner | rcytablespace | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+------------------------------+----------------------+--------------+---------+---------------+-------------------------------+--------------+------------
--+--------------+----------+---------------+----------------+---------------+-------------+--------------+----------------
     18658 |   12737 |    18652 | BIN$31C14EB48DC$9B2B$0==$0   | flashtest            | d            |       0 |      79354760 | 2023-09-13 20:47:57.075907+08 |     79354753 |     7935475
3 |         2200 |       10 |             0 |          18652 | t             | t           | 226824       |         226824
     18658 |   12737 |    18657 | BIN$31C14EB48E1$12E45E00==$0 | pg_toast_18652_index | d            |       3 |      79354760 | 2023-09-13 20:47:57.076129+08 |     79354753 |     7935475
3 |           99 |       10 |             0 |          18657 | f             | f           | 0            |              0
     18658 |   12737 |    18655 | BIN$31C14EB48DF$12E46400==$0 | pg_toast_18652       | d            |       2 |      79354760 | 2023-09-13 20:47:57.07621+08  |            0 |            
0 |           99 |       10 |             0 |          18655 | f             | f           | 226824       |         226824
(3 rows)

--查看表，表不存在
gaussdb=# select * from flashtest;
ERROR:  relation "flashtest" does not exist
LINE 1: select * from flashtest;
                      ^
--闪回drop表
gaussdb=# timecapsule table flashtest to before drop;
TimeCapsule Table
--查看表，表被恢复到drop之前
gaussdb=# select * from flashtest;
 id | name 
----+------
  1 | A
(1 row)

--查看回收站，回收站中的表被删除
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)

--DROP表
gaussdb=# drop table if EXISTS flashtest;
DROP TABLE
gaussdb=# select * from flashtest;
ERROR:  relation "flashtest" does not exist
LINE 1: select * from flashtest;
                      ^
--查看回收站，表被放入回收站
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid |           rcyname            |        rcyoriginname         | rcyoperation | rcytype | rcyrecyclecsn |        rcyrecycletime         | rcycreatecsn | rcy
changecsn | rcynamespace | rcyowner | rcytablespace | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+------------------------------+------------------------------+--------------+---------+---------------+-------------------------------+--------------+----
----------+--------------+----------+---------------+----------------+---------------+-------------+--------------+----------------
     18664 |   12737 |    18652 | BIN$31C14EB48DC$9B4E$0==$0   | flashtest                    | d            |       0 |      79354845 | 2023-09-13 20:49:17.762977+08 |     79354753 |    
 79354753 |         2200 |       10 |             0 |          18652 | t             | t           | 226824       |         226824
     18664 |   12737 |    18657 | BIN$31C14EB48E1$12E680A8==$0 | BIN$31C14EB48E1$12E45E00==$0 | d            |       3 |      79354845 | 2023-09-13 20:49:17.763271+08 |     79354753 |    
 79354753 |           99 |       10 |             0 |          18657 | f             | f           | 0            |              0
     18664 |   12737 |    18655 | BIN$31C14EB48DF$12E68698==$0 | BIN$31C14EB48DF$12E46400==$0 | d            |       2 |      79354845 | 2023-09-13 20:49:17.763343+08 |            0 |    
        0 |           99 |       10 |             0 |          18655 | f             | f           | 226824       |         226824
(3 rows)

--闪回drop表，表名用回收站中的rcyname
gaussdb=# timecapsule table "BIN$31C14EB48DC$9B4E$0==$0" to before drop;
TimeCapsule Table
----查看回收站，回收站中的表被删除
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)

gaussdb=# select * from flashtest;
 id | name 
----+------
  1 | A
(1 row)

--DROP表
gaussdb=# drop table if EXISTS flashtest;
DROP TABLE
----查看回收站，表被放入回收站
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid |           rcyname            |        rcyoriginname         | rcyoperation | rcytype | rcyrecyclecsn |        rcyrecycletime         | rcycreatecsn | rcy
changecsn | rcynamespace | rcyowner | rcytablespace | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+------------------------------+------------------------------+--------------+---------+---------------+-------------------------------+--------------+----
----------+--------------+----------+---------------+----------------+---------------+-------------+--------------+----------------
     18667 |   12737 |    18652 | BIN$31C14EB48DC$9B8D$0==$0   | flashtest                    | d            |       0 |      79354943 | 2023-09-13 20:52:14.525946+08 |     79354753 |    
 79354753 |         2200 |       10 |             0 |          18652 | t             | t           | 226824       |         226824
     18667 |   12737 |    18657 | BIN$31C14EB48E1$1320B4F0==$0 | BIN$31C14EB48E1$12E680A8==$0 | d            |       3 |      79354943 | 2023-09-13 20:52:14.526319+08 |     79354753 |    
 79354753 |           99 |       10 |             0 |          18657 | f             | f           | 0            |              0
     18667 |   12737 |    18655 | BIN$31C14EB48DF$1320BAE0==$0 | BIN$31C14EB48DF$12E68698==$0 | d            |       2 |      79354943 | 2023-09-13 20:52:14.526423+08 |            0 |    
        0 |           99 |       10 |             0 |          18655 | f             | f           | 226824       |         226824
(3 rows)

--查看表，表不存在
gaussdb=# select * from flashtest;
ERROR:  relation "flashtest" does not exist
LINE 1: select * from flashtest;
                      ^
--闪回drop表，并重命名表
gaussdb=# timecapsule table flashtest to before drop rename to flashtest_rename;
TimeCapsule Table
--查看原表，表不存在
gaussdb=# select * from flashtest;
ERROR:  relation "flashtest" does not exist
LINE 1: select * from flashtest;
                      ^
--查看重命名后的表，表存在
gaussdb=# select * from flashtest_rename;
 id | name 
----+------
  1 | A
(1 row)

--查看回收站，回收站中的表被删除
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)
--drop表
gaussdb=# drop table if EXISTS flashtest_rename;
DROP TABLE
--清空回收站
gaussdb=# PURGE RECYCLEBIN;
PURGE RECYCLEBIN
--查看回收站，回收站被清空
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)


-- TIMECAPSULE TABLE { table_name } TO BEFORE TRUNCATE --
gaussdb=# drop table if EXISTS flashtest;
NOTICE:  table "flashtest" does not exist, skipping
DROP TABLE
--创建表flashtest
gaussdb=# create table if not EXISTS flashtest(id int, name text) with (storage_type = ustore);
NOTICE:  The 'DISTRIBUTE BY' clause is not specified. Using 'id' as the distribution column by default.
HINT:  Please use 'DISTRIBUTE BY' clause to specify suitable data distribution column.
CREATE TABLE
--插入数据
gaussdb=# insert into flashtest values(1, 'A');
INSERT 0 1
gaussdb=# select * from flashtest;
 id | name 
----+------
  1 | A
(1 row)

--truncate表
gaussdb=# truncate table flashtest;
TRUNCATE TABLE
--查看回收站，表的数据被放入回收站
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid |           rcyname            |    rcyoriginname     | rcyoperation | rcytype | rcyrecyclecsn |        rcyrecycletime         | rcycreatecsn | rcychangecs
n | rcynamespace | rcyowner | rcytablespace | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+------------------------------+----------------------+--------------+---------+---------------+-------------------------------+--------------+------------
--+--------------+----------+---------------+----------------+---------------+-------------+--------------+----------------
     18703 |   12737 |    18697 | BIN$31C14EB4909$9E4C$0==$0   | flashtest            | t            |       0 |      79356608 | 2023-09-13 21:24:42.819863+08 |     79356606 |     7935660
6 |         2200 |       10 |             0 |          18697 | t             | t           | 227927       |         227927
     18703 |   12737 |    18700 | BIN$31C14EB490C$132FE3F0==$0 | pg_toast_18697       | t            |       2 |      79356608 | 2023-09-13 21:24:42.820358+08 |            0 |            
0 |           99 |       10 |             0 |          18700 | f             | f           | 227927       |         227927
     18703 |   12737 |    18702 | BIN$31C14EB490E$132FEA40==$0 | pg_toast_18697_index | t            |       3 |      79356608 | 2023-09-13 21:24:42.821012+08 |     79356606 |     7935660
6 |           99 |       10 |             0 |          18702 | f             | f           | 0            |              0
(3 rows)

--查看表，表中的数据为空
gaussdb=# select * from flashtest;
 id | name 
----+------
(0 rows)

--闪回truncate表
gaussdb=# timecapsule table flashtest to before truncate;
TimeCapsule Table
--查看表，表中的数据被恢复
gaussdb=# select * from flashtest;
 id | name 
----+------
  1 | A
(1 row)

--查看回收站
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid |           rcyname            |    rcyoriginname     | rcyoperation | rcytype | rcyrecyclecsn |        rcyrecycletime         | rcycreatecsn | rcychangecs
n | rcynamespace | rcyowner | rcytablespace | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+------------------------------+----------------------+--------------+---------+---------------+-------------------------------+--------------+------------
--+--------------+----------+---------------+----------------+---------------+-------------+--------------+----------------
     18703 |   12737 |    18702 | BIN$31C14EB490E$132FFC38==$0 | pg_toast_18697_index | t            |       3 |      79356610 | 2023-09-13 21:24:42.872654+08 |     79356606 |     7935660
6 |           99 |       10 |             0 |          18708 | f             | f           | 0            |              0
     18703 |   12737 |    18700 | BIN$31C14EB490C$13300228==$0 | pg_toast_18697       | t            |       2 |      79356610 | 2023-09-13 21:24:42.872732+08 |            0 |            
0 |           99 |       10 |             0 |          18706 | f             | f           | 0            |         227928
     18703 |   12737 |    18697 | BIN$31C14EB4909$9E4D$0==$0   | flashtest            | t            |       0 |      79356610 | 2023-09-13 21:24:42.872792+08 |     79356606 |     7935660
6 |         2200 |       10 |             0 |          18704 | t             | t           | 0            |         227928
(3 rows)

--drop表
gaussdb=# drop table if EXISTS flashtest;
DROP TABLE
--清空回收站
gaussdb=# PURGE RECYCLEBIN;
PURGE RECYCLEBIN
--查看回收站，回收站被清空
gaussdb=# select * from gs_recyclebin;
 rcybaseid | rcydbid | rcyrelid | rcyname | rcyoriginname | rcyoperation | rcytype | rcyrecyclecsn | rcyrecycletime | rcycreatecsn | rcychangecsn | rcynamespace | rcyowner | rcytablespace
 | rcyrelfilenode | rcycanrestore | rcycanpurge | rcyfrozenxid | rcyfrozenxid64 
-----------+---------+----------+---------+---------------+--------------+---------+---------------+----------------+--------------+--------------+--------------+----------+--------------
-+----------------+---------------+-------------+--------------+----------------
(0 rows)

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