openGauss每日一练第4天 | 学习心得

学习目标

学习openGauss体系结构，使用多个用户访问同一个数据库

课程学习

创建user1、user2、user3用户，验证数据库musicdb可以被用户user1、user2、user3访问（分别在数据库中创建了一张表、插入数据、进行查询）。即一个数据库可以被多个用户访问。
作业
1.环境准备
--创建表空间
musicdb=> CREATE TABLESPACE music_tbs2 RELATIVE LOCATION 'tablespace/test_ts2';
CREATE TABLESPACE
--创建数据库
musicdb=> CREATE DATABASE musicdb2 WITH TABLESPACE = music_tbs2;
CREATE DATABASE
2.创建用户user1、user2、user3，授予user1、user2、user3数据库系统的SYSADMIN权限
--创建用户
omm=#  CREATE USER user1 IDENTIFIED BY 'kunpeng@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=#  CREATE USER user2 IDENTIFIED BY 'kunpeng@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=#  CREATE USER user3 IDENTIFIED BY 'kunpeng@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
--授权
omm=# ALTER USER user1 SYSADMIN;
ALTER ROLE
omm=# ALTER USER user2 SYSADMIN;
ALTER ROLE
omm=# ALTER USER user3 SYSADMIN;
ALTER ROLE
--查看
omm=# \du
                                                          List of roles
Role name |                                               Attributes                                                    | Member of 

gaussdb   | Sysadmin                                                                                                         	| {}
omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, 	Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
user1     | Sysadmin                                                                                                         | {}
user2     | Sysadmin                                                                                                         | {}
user3     | Sysadmin                                                                                                         	| {}
2.分别使用user1、user2、user3访问数据库musicdb2，创建各自的表，并插入数据。
omm=#  \c musicdb2 user1
Password for user user1: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user1".
musicdb=>   create table products1(product_id INTEGER,product_name char(20),category char(30));
musicdb=> CREATE TABLE

musicdb=> insert into products1 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb=>   insert into products1 values(1601,'lamaze','toys');
INSERT 0 1
musicdb=>   insert into products1 values(1700,'wait interface','Books');
INSERT 0 1
musicdb=>   insert into products1 values(1666,'harry potter','toys');
INSERT 0 1
musicdb=>   select * from products1;
product_id |     product_name     |            category            
------------+----------------------+--------------------------------
   1502 | olympus camera       | electrncs                     
   1601 | lamaze               | toys                          
   1700 | wait interface       | Books                         
   1666 | harry potter         | toys                          
(4 rows)

musicdb=>   \c musicdb2 user2
Password for user user2: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user2".
musicdb=> create table products2(product_id INTEGER,product_name char(20),category char(30));
CREATE TABLE
musicdb=>   insert into products2 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb=>   insert into products2 values(1601,'lamaze','toys');
INSERT 0 1
musicdb=>   insert into products2 values(1700,'wait interface','Books');
INSERT 0 1
musicdb=>   insert into products2 values(1666,'harry potter','toys');
INSERT 0 1
musicdb=>   select * from products2;
product_id |     product_name     |            category            
------------+----------------------+--------------------------------
   1502 | olympus camera       | electrncs                     
   1601 | lamaze               | toys                          
   1700 | wait interface       | Books                         
   1666 | harry potter         | toys                          
(4 rows)

musicdb=>   \c musicdb2 user3
Password for user user3: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user3".
musicdb=> create table products3(product_id INTEGER,product_name char(20),category char(30));
CREATE TABLE
musicdb=>   insert into products3 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb=>   insert into products3 values(1601,'lamaze','toys');
INSERT 0 1
musicdb=>   insert into products3 values(1700,'wait interface','Books');
INSERT 0 1
musicdb=>   insert into products3 values(1666,'harry potter','toys');
INSERT 0 1
musicdb=>   select * from products3;
product_id |     product_name     |            category            
------------+----------------------+--------------------------------
   1502 | olympus camera       | electrncs                     
   1601 | lamaze               | toys                          
   1700 | wait interface       | Books                         
   1666 | harry potter         | toys                          
(4 rows)
3.使用user1、user2、user3用户中的任何一个，查看当前数据库musicdb2有哪些表
musicdb=>   \c musicdb2 user3
Password for user user3: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user3".
musicdb=> \dt
                       List of relations
 Schema |   Name    | Type  | Owner |             Storage              
--------+-----------+-------+-------+----------------------------------
public | products1 | table | user1 | {orientation=row,compression=no}
public | products2 | table | user2 | {orientation=row,compression=no}
public | products3 | table | user3 | {orientation=row,compression=no}
(3 rows)