环境介绍

操作系统:linux

课程作业

首先需要切换进入omm用户
1.从操作系统层面查看数据库进程和线程,判断数据库是否启动。
(1)ps -ef|grep gauss
(2)ps -Tp 1

omm@modb:~$ ps -ef|grep gauss
omm          1     0  0 16:36 ?        00:00:00 gaussdb
omm        387   376  0 16:38 pts/0    00:00:00 grep gauss
omm@modb:~$ ps -Tp 1
  PID  SPID TTY          TIME CMD
    1     1 ?        00:00:00 gaussdb
    1   293 ?        00:00:00 jemalloc_bg_thd
    1   299 ?        00:00:00 gaussdb
    1   300 ?        00:00:00 syslogger
    1   301 ?        00:00:00 jemalloc_bg_thd
    1   302 ?        00:00:00 alarm
    1   303 ?        00:00:00 reaper
    1   304 ?        00:00:00 jemalloc_bg_thd
    1   349 ?        00:00:00 checkpointer
    1   305 ?        00:00:00 jemalloc_bg_thd
    1   350 ?        00:00:00 Spbgwriter
    1   351 ?        00:00:00 pagewriter
    1   352 ?        00:00:00 pagewriter
    1   353 ?        00:00:00 pagewriter
    1   354 ?        00:00:00 pagewriter
    1   355 ?        00:00:00 pagewriter
    1   356 ?        00:00:00 WALwriter
    1   357 ?        00:00:00 WALwriteraux
    1   358 ?        00:00:00 AVClauncher
    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   367 ?        00:00:00 auditor
    1   366 ?        00:00:00 TrackStmtWorker
    1   368 ?        00:00:00 2pccleaner
    1   369 ?        00:00:00 faultmonitor
    1   370 ?        00:00:00 WLMworker
    1   371 ?        00:00:00 WLMmonitor
    1   372 ?        00:00:00 WLMarbiter
    1   373 ?        00:00:00 undorecycler

2.使用gs_ctl工具查看数据库状态,判断数据库是否启动。

gs_ctl status

omm@modb:~$ gs_ctl status
[2022-11-24 17:04:08.626][518][][gs_ctl]: gs_ctl status,datadir is /var/lib/opengauss/data 
gs_ctl: server is running (PID: 1)
/usr/local/opengauss/bin/gaussdb

3.使用gs_ctl 查看数据文件的目录

gs_ctl notify
gs_ctl status也可以查看到

omm@modb:~$ gs_ctl status
[2022-11-24 17:04:08.626][518][][gs_ctl]: gs_ctl status,datadir is /var/lib/opengauss/data 
gs_ctl: server is running (PID: 1)
/usr/local/opengauss/bin/gaussdb
omm@modb:~$ gs_ctl notify
[2022-11-24 17:05:54.209][526][][gs_ctl]: gs_ctl notify ,datadir is /var/lib/opengauss/data 
[2022-11-24 17:05:54.209][526][][gs_ctl]: the parameter of notify must be specified

4.从环境变量查看数据文件的目录
grep -i PGDATA ~/.bashrc

omm@modb:~$ grep -i PGDATA ~/.bashrc 
export PGDATA=/var/lib/opengauss/data
omm@modb:~$ 

5.在gsql中查看数据文件目录、数据库版本
su - omm
gsql -r
show data_directory ;
select version();

root@modb:~# 
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=# show data_directory;
     data_directory      
-------------------------
 /var/lib/opengauss/data
(1 row)

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, compiled by
 g++ (GCC) 7.3.0, 64-bit
(1 row)

omm=#