openGauss每日一练第 3 天 | 建立表空间、数据库

课程作业
1.创建表空间music_tbs1和多个数据库music_db、music_db1、music_db2
2.查看数据库上的表空间
3.查看openGauss实例上有哪些数据库
4.使用操作系统命令，查看openGauss实例的进程、线程

创建表空间，创建数据库

omm=# select version();
                                                                        version                                     
                                   
--------------------------------------------------------------------------------------------------------------------
-----------------------------------
 (openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr   on aarch64-unknown-linux-gnu, c
ompiled by g++ (GCC) 7.3.0, 64-bit
(1 row)

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

查看表空间

omm=# \db
           List of tablespaces
    Name    | Owner |      Location       
------------+-------+---------------------
 music_tbs  | omm   | tablespace/test_ts1
 pg_default | omm   | 
 pg_global  | omm   | 
(3 rows)

查看实例上的数据库

omm-# \l
                         List of databases
   Name    | Owner | Encoding | Collate | Ctype | Access privileges 
-----------+-------+----------+---------+-------+-------------------
 musicdb   | omm   | UTF8     | C       | C     | 
 musicdb1  | omm   | UTF8     | C       | C     | 
 musicdb2  | omm   | UTF8     | C       | C     | 
 musicdb3  | 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
(8 rows)

omm-#

OS层查看实例进程、线程

omm=# ! ps -ef | grep gaussdb
omm-# \!ps -ef | grep -i gaussdb
Invalid command \!ps. Try \? for help.
omm-# \! ps -ef | grep -i gaussdb
omm          1     0  0 16:25 ?        00:00:01 gaussdb
omm        414   378  0 16:29 pts/0    00:00:00 sh -c ps -ef | grep -i gaussdb
omm        416   414  0 16:29 pts/0    00:00:00 grep -i gaussdb
omm-# \! ps -Tp 1
    1   293 ?        00:00:00 jemalloc_bg_thd
    1   299 ?        00:00:00 gaussdb
  PID  SPID TTY          TIME CMD
    1     1 ?        00:00:00 gaussdb
    1   300 ?        00:00:00 syslogger
    1   301 ?        00:00:00 jemalloc_bg_thd
    1   303 ?        00:00:00 reaper
    1   302 ?        00:00:00 alarm
    1   304 ?        00:00:00 jemalloc_bg_thd
    1   349 ?        00:00:00 checkpointer
    1   350 ?        00:00:00 Spbgwriter
    1   305 ?        00:00:00 jemalloc_bg_thd
    1   351 ?        00:00:00 pagewriter
    1   352 ?        00:00:00 pagewriter
    1   354 ?        00:00:00 pagewriter
    1   353 ?        00:00:00 pagewriter
    1   355 ?        00:00:00 pagewriter
    1   356 ?        00:00:00 WALwriter
    1   358 ?        00:00:00 AVClauncher
    1   357 ?        00:00:00 WALwriteraux
    1   359 ?        00:00:00 Jobscheduler
    1   360 ?        00:00:00 asyncundolaunch
    1   361 ?        00:00:00 globalstats
    1   362 ?        00:00:00 applylauncher
    1   363 ?        00:00:00 statscollector
    1   364 ?        00:00:00 percentworker
    1   365 ?        00:00:00 ashworker
    1   366 ?        00:00:00 TrackStmtWorker
    1   367 ?        00:00:00 auditor
    1   368 ?        00:00:00 2pccleaner
    1   370 ?        00:00:00 WLMworker
    1   369 ?        00:00:00 faultmonitor
    1   371 ?        00:00:00 WLMmonitor
    1   372 ?        00:00:00 WLMarbiter
    1   373 ?        00:00:00 undorecycler
    1   379 ?        00:00:00 worker
omm-#