openGauss每日一练第5天 - 学习心得体会

学习目标

学习openGauss体系结构，使用一个用户访问多个数据库。

课程学习

数据库用户user1可以访问不同的数据库（musicdb1、musicdb2、musicdb3）
实验中user1用户在数据库musicdb1中创建了表t11、
在数据库musicdb2创建了表t21
在数据库musicdb3中创建了表

课程作业

1.创建数据库musicdb10，创建用户user10，赋予sysadmin权限

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=# create tablespace music_tbs10  RELATIVE LOCATION 'tablespace/test_ts10';
CREATE TABLESPACE
omm=# CREATE DATABASE musicdb10 with tablespace=music_tbs10;
CREATE DATABASE
omm=# CREATE USER user10  IDENTIFIED BY 'kunpeng@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# ALTER USER user10 sysadmin;
ALTER ROLE

2.用户user10访问数据库postgres，创建一个表并插入数据

omm=# \c postgres user10
Password for user user10: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "postgres" as user "user10".
openGauss=> create table yangkai1(id int,name varchar(20));
CREATE TABLE
openGauss=> insert into yangkai1 values(1,'yangkai');
INSERT 0 1
openGauss=> select * from yangkai1;
id |  name   
----+---------
1 | yangkai
(1 row)

3.用户user10访问数据库omm，创建一个表并插入数据

openGauss=> \c omm user10
Password for user user10: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "omm" as user "user10".
omm=> create table yangkai2(id int,name varchar(20));
CREATE TABLE
omm=> insert into yangkai2 values(1,'yangkai');
INSERT 0 1
omm=> select * from yangkai2;
id |  name   
----+---------
1 | yangkai
(1 row)	

4.用户user10访问数据库musicdb10，创建一个表并插入数据t31，验证了这个结论

omm=> \c musicdb10 user10
Password for user user10: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb10" as user "user10".
musicdb10=> create table yangkai3(id int,name varchar(20));
CREATE TABLE
musicdb10=> insert into yangkai3 values(1,'yangkai');
INSERT 0 1
musicdb10=> select * from  yangkai3;
id |  name   
----+---------
1 | yangkai
(1 row)