云数据库 GAUSSDB-闪回DROP/TRUNCATE:语法示例
时间：2023-11-24 09:43:09
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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);
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);
CREATE TABLE
--为表flashtest创建索引flashtest_index
gaussdb=# create index flashtest_index on flashtest(id);
CREATE INDEX
--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);
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);
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)support.huaweicloud.com/fg-gaussdb-cent/gaussdb-48-0159.html
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