课后作业

1.创建表空间newtbs1

omm=# drop tablespace IF EXISTS newtbs1;
DROP TABLESPACE
omm=# CREATE TABLESPACE newtbs1 RELATIVE LOCATION 'tablespace/newtbs1';
CREATE TABLESPACE

2.创建3个数据库newdb1、newdb2、newdb3，默认表空间为newtbs1

omm=# CREATE DATABASE newdb1 WITH TABLESPACE newtbs1;
CREATE DATABASE
omm=#  CREATE DATABASE newdb2 WITH TABLESPACE newtbs1;
CREATE DATABASE
omm=# CREATE DATABASE newdb3  WITH TABLESPACE newtbs1;
CREATE DATABASE

3.使用sql查看表空间newtbs1上有几个数据库

omm=# select datname,dattablespace,spcname from pg_database d, pg_tablespace t where d.dattablespace=t.oid and spcname=‘newtbs1’;
(3 rows)

omm=#  datname | dattablespace | spcname 
---------+---------------+---------
newdb1  |         16390 | newtbs1
newdb2  |         16390 | newtbs1
newdb3  |         16390 | newtbs1

4.在文件系统中查看表空间newtbs1中的多个数据库

omm@modb:~$ cd /var/lib/opengauss/data/pg_tblspc/16390/
omm@modb:/var/lib/opengauss/data/pg_tblspc/16390$ cd  PG_9.2* 
omm@modb:/var/lib/opengauss/data/pg_tblspc/16390/PG_9.2_201611171_gaussdb$ ls
16391  16392  16393  pgsql_tmp
omm@modb:/var/lib/opengauss/data/pg_tblspc/16390/PG_9.2_201611171_gaussdb$