openGauss每日一练第8天|表空间与数据库

1.创建表空间newtbs1，ds_location1，查看表空间。

--进入数据库omm，创建表空间
su - omm
gsql -r
CREATE TABLESPACE newtbs1 RELATIVE LOCATION 'tablespace/new_ts1';
CREATE TABLESPACE ds_location1 RELATIVE LOCATION 'tablespace/location_ts1';
\db

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 newtbs1 RELATIVE LOCATION 'tablespace/new_ts1';
CREATE TABLESPACE
omm=# CREATE TABLESPACE ds_location1 RELATIVE LOCATION 'tablespace/location_ts1';
CREATE TABLESPACE

omm=# \db
              List of tablespaces
     Name     | Owner |        Location         
--------------+-------+-------------------------
 ds_location1 | omm   | tablespace/location_ts1
 newtbs1      | omm   | tablespace/new_ts1
 pg_default   | omm   | 
 pg_global    | omm   | 
(4 rows)

omm=# 

2.创建一个数据库newdb1，默认表空间为newtbs1。

CREATE DATABASE newdb1  WITH TABLESPACE = newtbs1;
\l

omm=# CREATE DATABASE newdb1  WITH TABLESPACE = newtbs1;
CREATE DATABASE
omm=# \l
                         List of databases
   Name    | Owner | Encoding | Collate | Ctype | Access privileges 
-----------+-------+----------+---------+-------+-------------------
 newdb1    | 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)

3.创建用户user5，并授予SYSADMIN权限，访问数据库newdb1，在表空间ds_location1上，创建一个表newt1(表结构自定义)。

--创建用户user5并授予SYSADMIN权限：
CREATE USER user5 IDENTIFIED BY 'Mygstest@1234';
ALTER USER user5 SYSADMIN;
\c newdb1 user5
create table newt1(product_id INTEGER,product_name Char(20),category Char(30)) tablespace ds_location1;

omm=# CREATE USER user5 IDENTIFIED BY 'Mygstest@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# ALTER USER user5 SYSADMIN;
ALTER ROLE
omm=# \c newdb1 user5
Password for user user5: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "newdb1" as user "user5".
newdb1=> create table newt1(product_id INTEGER,product_name Char(20),category Char(30)) tablespace ds_location1;
CREATE TABLE
newdb1=> 

4.查看表所在的表空间。

select * from pg_tables where tablename = 'newt1';
--查看默认表空间
select datname,dattablespace,spcname from pg_database d,pg_tablespace t where d.dattablespace=t.oid;

newdb1=> \dt
                         List of relations
 Schema | Name  | Type  | Owner |             Storage              
--------+-------+-------+-------+----------------------------------
 public | newt1 | table | user5 | {orientation=row,compression=no}
(1 row)

newdb1=> select * from pg_tables where tablename = 'newt1';
 schemaname | tablename | tableowner |  tablespace  | hasindexes | hasrules | hastriggers | tablecreator |            created            |         last_ddl_time         
------------+-----------+------------+--------------+------------+----------+-------------+--------------+-------------------------------+-------------------------------
 public     | newt1     | user5      | ds_location1 | f          | f        | f           | user5        | 2022-12-01 13:46:27.717062+08 | 2022-12-01 13:46:27.717062+08

(1 row)

newdb1=> select datname,dattablespace,spcname from pg_database d, pg_tablespace t where d.dattablespace=t.oid;
  datname  | dattablespace |  spcname   
-----------+---------------+------------
 template1 |          1663 | pg_default
 omm       |          1663 | pg_default
 newdb1    |         16392 | newtbs1
 template0 |          1663 | pg_default
 postgres  |          1663 | pg_default
(5 rows)

newdb1=> 

5.查看表空间newtbs1、 ds_location1上的对象。

\c newdb1 user5
select relname, relkind, relpages,pg_size_pretty(pg_relation_size(a.oid)),reltablespace,relowner  
from pg_class a, pg_tablespace tb  
where a.relkind in ('r', 'i')  
and a.reltablespace=tb.oid  
and tb.spcname in ('ds_location1','newtbs1')  
order by a.relpages desc;

omm=# \c newdb1 user5
Password for user user5: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "newdb1" as user "user5".
newdb1=> select relname, relkind, relpages,pg_size_pretty(pg_relation_size(a.oid)),reltablespace,relowner  
newdb1-> newdb1-> from pg_class a, pg_tablespace tb  
where a.relkind in ('r', 'i')  
newdb1-> and a.reltablespace=tb.oid  
newdb1-> and tb.spcname in ('ds_location1','newtbs1')  
newdb1-> order by a.relpages desc;
 relname | relkind | relpages | pg_size_pretty | reltablespace | relowner 
---------+---------+----------+----------------+---------------+----------
 newt1   | r       |        0 | 0 bytes        |         16393 |    16395
(1 row)

newdb1=>