openGauss每日一练第4天 | 多个用户访问同一个数据库

原创李先生 2022-11-27

226

openGauss中一个数据库可以被多个用户访问

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。

1.测试环境准备：

su - omm
gsql -r
--进入数据库omm，创建表空间、测试数据库
root@modb:~# su - omm
omm@modb:~$ gsql -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# drop DATABASE  IF EXISTS  musicdb;
NOTICE:  database "musicdb" does not exist, skipping
DROP DATABASE
omm=# drop DATABASE  IF EXISTS  musicdb1;
NOTICE:  database "musicdb1" does not exist, skipping
DROP DATABASE
omm=# drop DATABASE  IF EXISTS  musicdb2;
NOTICE:  database "musicdb2" does not exist, skipping
DROP DATABASE
omm=# drop DATABASE  IF EXISTS  musicdb3;
NOTICE:  database "musicdb3" does not exist, skipping
DROP DATABASE
omm=# drop tablespace IF EXISTS music_tbs;
NOTICE:  Tablespace "music_tbs" does not exist, skipping.
DROP TABLESPACE
omm=# 
omm=# CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE TABLESPACE
omm=# CREATE DATABASE musicdb  WITH TABLESPACE = music_tbs;
CREATE DATABASE
omm=# 
omm=# \db
           List of tablespaces
    Name    | Owner |      Location       
------------+-------+---------------------
 music_tbs  | omm   | tablespace/test_ts1
 pg_default | omm   | 
 pg_global  | omm   | 
(3 rows)

omm=# \l
                         List of databases
   Name    | Owner | Encoding | Collate | Ctype | Access privileges 
-----------+-------+----------+---------+-------+-------------------
 musicdb   | omm   | UTF8     | C       | C     | 
 omm       | omm   | UTF8     | C       | C     | 
 postgres  | omm   | UTF8     | C       | C     | 
 template0 | omm   | UTF8     | C       | C     | =c/omm           +
           |       |          |         |       | omm=CTc/omm
 template1 | omm   | UTF8     | C       | C     | =c/omm           +
           |       |          |         |       | omm=CTc/omm
(5 rows)

omm=#

2.创建用户user1、user2、user3

--执行下面的SQL语句，创建用户user1、user2、user3：
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
omm=# 
 
--授予user1、user2、user3数据库系统的SYSADMIN权限：
omm=# ALTER USER user1 SYSADMIN;
ALTER ROLE
omm=# ALTER USER user2 SYSADMIN;
ALTER ROLE
omm=# ALTER USER user3 SYSADMIN;
ALTER ROLE
omm=# 

--执行下面的命令，查看有哪些用户：
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                                                                                                         | {}

omm=#

2.在终端中，分别使用user1、user2、user3用户访问数据库musicdb。

 --以用户user1的身份在数据库musicdb中创建表t1，并插入一条数据：
omm=# \c musicdb user1
Password for user user1: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb" as user "user1".
musicdb=> create table t1(col1 char(20));
CREATE TABLE
musicdb=> insert into t1 values('Hello kunpeng 1');
INSERT 0 1
musicdb=> select * from t1;
         col1         
----------------------
 Hello kunpeng 1     
(1 row)

musicdb=> 
 
--以用户user2的身份在数据库musicdb中创建表t2，并插入一条数据：
musicdb=> \c musicdb user2
Password for user user2: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb" as user "user2".
musicdb=> create table t2(col1 char(20));
CREATE TABLE
musicdb=> insert into t2 values('Hello kunpeng 2');
INSERT 0 1
musicdb=> select * from t2;
         col1         
----------------------
 Hello kunpeng 2     
(1 row)

musicdb=> 

--以用户user3的身份在数据库musicdb中创建表t3，并插入一条数据：
musicdb=> \c musicdb user3
Password for user user3: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb" as user "user3".
musicdb=> create table t3(col1 char(20));
CREATE TABLE
musicdb=> insert into t3 values('Hello kunpeng 3');
INSERT 0 1
musicdb=> select * from t3;
         col1         
----------------------
 Hello kunpeng 3     
(1 row)

musicdb=>

3.使用user1、user2、user3用户中的任何一个，执行如下命令，查看当前数据库musicdb有哪些表：

musicdb=> \dt 
                        List of relations
 Schema | Name | Type  | Owner |             Storage              
--------+------+-------+-------+----------------------------------
 public | t1   | table | user1 | {orientation=row,compression=no}
 public | t2   | table | user2 | {orientation=row,compression=no}
 public | t3   | table | user3 | {orientation=row,compression=no}
(3 rows)

musicdb=>

课后作业

1.创建用户user1、user2、user3，授予user1、user2、user3数据库系统的SYSADMIN权限

--执行下面的SQL语句，创建用户user1、user2、user3：
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
omm=#  

--授予user1、user2、user3数据库系统的SYSADMIN权限：
omm=# ALTER USER user1 SYSADMIN;
ALTER ROLE
omm=# ALTER USER user2 SYSADMIN;
ALTER ROLE
omm=# ALTER USER user3 SYSADMIN;
ALTER ROLE
omm=# 

--查看有哪些用户：
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                                                                                                         | {}

omm=#

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。表名和数据如下：

创建表空间及数据库
omm=# CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE TABLESPACE
omm=# CREATE DATABASE musicdb2  WITH TABLESPACE = music_tbs;
CREATE DATABASE
omm=# 

--以用户user1的身份在数据库musicdb2中创建表t1，并插入一条数据：
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".
musicdb2=> create table products1(product_id INTEGER,product_name char(20),category char(30));
CREATE TABLE
musicdb2=> insert into products1 values('1502','olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products1 values('1601','lamaze','toys');
INSERT 0 1
musicdb2=> insert into products1 values('1700','wait interface','Books');
INSERT 0 1
musicdb2=> insert into products1 values('1666','harry potter','toys');
INSERT 0 1
musicdb2=> 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)

musicdb2=> 
 
--以用户user2的身份在数据库musicdb中创建表t2，并插入一条数据：
musicdb2=> \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".
musicdb2=> create table products2(product_id INTEGER,product_name char(20),category char(30));
CREATE TABLE
musicdb2=> insert into products2 values('1502','olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products2 values('1601','lamaze','toys');
INSERT 0 1
musicdb2=> insert into products2 values('1700','wait interface','Books');
INSERT 0 1
musicdb2=> insert into products2 values('1666','harry potter','toys');
INSERT 0 1
musicdb2=> 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)

musicdb2=>

--以用户user3的身份在数据库musicdb中创建表t3，并插入一条数据：
musicdb2=> \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".
musicdb2=> create table products3(product_id INTEGER,product_name char(20),category char(30));
CREATE TABLE
musicdb2=> insert into products3 values('1502','olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products3 values('1601','lamaze','toys');
INSERT 0 1
musicdb2=> insert into products3 values('1700','wait interface','Books');
INSERT 0 1
musicdb2=> insert into products3 values('1666','harry potter','toys');
INSERT 0 1
musicdb2=> 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)

musicdb2=>

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

musicdb2=> \d 
                           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)

musicdb2=>

–学如逆水行舟，不进则退。

最后修改时间：2022-11-27 12:26:00

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openGauss每日一练第4天 | 多个用户访问同一个数据库

openGauss中一个数据库可以被多个用户访问

学习目标

课程学习

课后作业

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