openGauss每日一练第5天 - 学习心得体会

测试环境准备

–进入数据库omm，创建表空间、测试数据库

su - omm
gsql -r

drop DATABASE IF EXISTS musicdb;
drop DATABASE IF EXISTS musicdb1;
drop DATABASE IF EXISTS musicdb2;
drop DATABASE IF EXISTS musicdb3;
drop tablespace IF EXISTS music_tbs;

CREATE TABLESPACE music_tbs RELATIVE LOCATION ‘tablespace/test_ts1’;
CREATE DATABASE musicdb1 WITH TABLESPACE = music_tbs;
CREATE DATABASE musicdb2 WITH TABLESPACE = music_tbs;
CREATE DATABASE musicdb3 WITH TABLESPACE = music_tbs;

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=# CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE TABLESPACE
omm=# CREATE DATABASE musicdb1  WITH TABLESPACE = music_tbs;
CREATE DATABASE
omm=# CREATE DATABASE musicdb2  WITH TABLESPACE = music_tbs;
CREATE DATABASE
omm=# CREATE DATABASE musicdb3  WITH TABLESPACE = music_tbs;
CREATE DATABASE
omm=# 

–执行下面的SQL语句，创建用户user1：

CREATE USER user1 IDENTIFIED BY ‘kunpeng@1234’;

omm=#  CREATE USER user1 IDENTIFIED BY 'kunpeng@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# 

–授予user1数据库系统的SYSADMIN权限：

ALTER USER user1 SYSADMIN;

omm=# ALTER USER user1 SYSADMIN;
ALTER ROLE
omm=# 

使用数据库用户user1登录到数据库musicdb1，创建一个表t11，并插入一条数据：

–用户user1登录到数据库musicdb1，创建表t11，并插入、查看数据

\c musicdb1 user1

create table t11(col1 char(20));

insert into t11 values(‘Hello openGauss! 11’);

select * from t11;

omm=# \c musicdb1 user1
Password for user user1: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb1" as user "user1".
musicdb1=>  create table t11(col1 char(20));
CREATE TABLE
musicdb1=>  insert into t11 values('Hello openGauss! 11');
INSERT 0 1
musicdb1=> 
musicdb1=>  select * from t11;      
         col1         
----------------------
 Hello openGauss! 11 
(1 row)

musicdb1=> 

使用数据库用户user1登录到数据库musicdb2，创建一个表t21，并插入一条数据：

–用户user1登录到数据库musicdb2，创建表t21，并插入、查看数据

\c musicdb2 user1

create table t21(col1 char(20));

insert into t21 values(‘Hello openGauss! 22’);

select * from t21;

musicdb1=>   \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 t21(col1 char(20));
CREATE TABLE
musicdb2=>  insert into t21 values('Hello openGauss! 22');
INSERT 0 1
musicdb2=>  select * from t21;
         col1         
----------------------
 Hello openGauss! 22 
(1 row)

musicdb2=> 

使用数据库用户user1登录到数据库musicdb3，创建一个表t31，并插入一条数据：

–用户user1登录到数据库musicdb3，创建表t31，并插入、查看数据

\c musicdb3 user1

create table t31(col1 char(20));

insert into t31 values(‘Hello openGauss! 33’);

select * from t31;

musicdb2=>   \c musicdb3 user1
Password for user user1: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb3" as user "user1".
musicdb3=>  create table t31(col1 char(20));
CREATE TABLE
musicdb3=> 
musicdb3=>  insert into t31 values('Hello openGauss! 33');
INSERT 0 1
musicdb3=>  select * from t31;
         col1         
----------------------
 Hello openGauss! 33 
(1 row)

musicdb3=> 

课后作业

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

CREATE DATABASE musicdb10 ;

CREATE USER user10 IDENTIFIED BY ‘kunpeng@1234’;

ALTER USER user10 SYSADMIN;

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 DATABASE musicdb10;
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

用户user10访问数据库postgres，创建一个表并插入数据

\c postgres user10

create table tt1(col1 char(20));

insert into tt1 values(‘lucky data! 666’);

select * from tt1;

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 tt1(col1 char(20));
CREATE TABLE
openGauss=> insert into tt1 values('lucky data! 666'); 
INSERT 0 1
openGauss=> select * from tt1;
(1 row)

openGauss=>          col1         
----------------------
 lucky data! 666     

openGauss=> 

用户user10访问数据库omm，创建一个表并插入数据

\c omm user10

create table tt1(col1 char(20));

insert into tt1 values(‘lucky data! 666’);

select * from tt1;

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 tt1(col1 char(20)); 
CREATE TABLE
omm=> insert into tt1 values('lucky data! 666'); 
INSERT 0 1
omm=> select * from tt1;
         col1         
----------------------
 lucky data! 666     
(1 row)

omm=> 

用户user10访问数据库musicdb10，创建一个表并插入数据

\c musicdb10 user10

create table tt1(col1 char(20));

insert into tt1 values(‘lucky data! 666’);

select * from tt1;

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 tt1(col1 char(20)); 
CREATE TABLE
musicdb10=> insert into tt1 values('lucky data! 666'); 
INSERT 0 1
musicdb10=> select * from tt1;
musicdb10=>          col1         
----------------------
 lucky data! 666     
(1 row)


musicdb10=>