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。

课程作业

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

测试环境准备：

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_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE TABLESPACE

创建数据库musicdb10

omm=# CREATE DATABASE musicdb10  WITH TABLESPACE = music_tbs;
CREATE DATABASE

创建用户user10，赋予sysadmin权限

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

musicdb1=> \q
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=# \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 z1(col1 char(20));
CREATE TABLE
openGauss=> insert into z1 values('hell opengauss!z1');
INSERT 0 1
openGauss=> select * from z1;
(1 row)

openGauss=>          col1         
----------------------
 hell opengauss!z1   

3.用户user10访问数据库omm，创建一个表并插入数据

omm=# \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 z2(col1 char(20));
CREATE TABLE
omm=> insert into z2 values('hello opengauss!z22');
INSERT 0 1
omm=> select * from z2;
         col1         
----------------------
 hello opengauss!z22 
(1 row)

4.用户user10访问数据库musicdb10，创建一个表并插入数据

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 z3(col1 char(20));
CREATE TABLE
musicdb10=> insert into z3 values('hello opengauss! 33');
INSERT 0 1
musicdb10=> select * from z3;
musicdb10=>          col1         
----------------------
 hello opengauss! 33 
(1 row)

musicdb10=>