openGauss每日一练第1天 | 学习心得体会

课程作业

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。

omm 1 0 0 10:48 ? 00:00:01 gaussdb  
omm 400 396 0 10:52 pts/0 00:00:00 grep gauss  
omm@modb:~$  
omm@modb:~$ ps -Tp 1  
PID SPID TTY TIME CMD  
1 1 ? 00:00:00 gaussdb  
1 293 ? 00:00:00 jemalloc\_bg\_thd  
1 301 ? 00:00:00 jemalloc\_bg\_thd  
1 302 ? 00:00:00 alarm  
1 299 ? 00:00:00 gaussdb  
1 300 ? 00:00:00 syslogger  
1 303 ? 00:00:00 reaper  
1 304 ? 00:00:00 jemalloc\_bg\_thd  
1 305 ? 00:00:00 jemalloc\_bg\_thd  
1 349 ? 00:00:00 checkpointer  
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  
1 356 ? 00:00:00 WALwriter  
1 355 ? 00:00:00 pagewriter  
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  
1 366 ? 00:00:00 TrackStmtWorker  
1 367 ? 00:00:00 auditor  
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。

\[2022-11-24 10:53:23.474\]\[402\]\[\]\[gs\_ctl\]: 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

\[2022-11-24 10:53:37.544\]\[406\]\[\]\[gs\_ctl\]: gs\_ctl notify ,datadir is /var/lib/opengauss/data  
\[2022-11-24 10:53:37.544\]\[406\]\[\]\[gs\_ctl\]: the parameter of notify must be specified

4.从环境变量查看数据文件的目录

omm@modb:~$ cat ~/.bashrc

====================================================

see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
========================================================================

for examples
============

If not running interactively, don’t do anything
===============================================

case $- in  
_i_) ;;  
\*) return;;  
esac

don’t put duplicate lines or lines starting with space in the history.
======================================================================

See bash(1) for more options
============================

HISTCONTROL=ignoreboth

append to the history file, don’t overwrite it
==============================================

shopt -s histappend

for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
===================================================================

HISTSIZE=1000  
HISTFILESIZE=2000

check the window size after each command and, if necessary,
===========================================================

update the values of LINES and COLUMNS.
=======================================

shopt -s checkwinsize

If set, the pattern “\*\*” used in a pathname expansion context will
====================================================================

match all files and zero or more directories and subdirectories.
================================================================

#shopt -s globstar

make less more friendly for non-text input files, see lesspipe(1)
=================================================================

#\[ -x /usr/bin/lesspipe \] && eval “$(SHELL=/bin/sh lesspipe)”

set variable identifying the chroot you work in (used in the prompt below)
==========================================================================

if \[ -z “${debian\_chroot:-}” \] && \[ -r /etc/debian\_chroot \]; then  
debian\_chroot=$(cat /etc/debian\_chroot)  
fi

set a fancy prompt (non-color, unless we know we “want” color)
==============================================================

case “$TERM” in  
xterm-color|\*-256color) color\_prompt=yes;;  
esac

uncomment for a colored prompt, if the terminal has the capability; turned
==========================================================================

off by default to not distract the user: the focus in a terminal window
=======================================================================

should be on the output of commands, not on the prompt
======================================================

#force\_color\_prompt=yes

if \[ -n “$force\_color\_prompt” \]; then  
–color=auto’

    #alias grep='grep --color=auto'
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
        # We have color support; assume it's compliant with Ecma-48
        # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
        # a case would tend to support setf rather than setaf.)
        color_prompt=yes
    else
        color_prompt=
    fi
    

fi

if \[ “$color\_prompt” = yes \]; then  
PS1=’${debian\_chroot:+($debian\_chroot)}\[\\033\[01;32m\]\\u@\\h\[\\033\[00m\]:\[\\033\[01;34m\]\\w\[\\033\[00m\]$ ’  
else  
PS1=’${debian\_chroot:+($debian\_chroot)}\\u@\\h:\\w$ ’  
fi  
unset color\_prompt force\_color\_prompt

If this is an xterm set the title to user@host:dir
==================================================

case “$TERM” in  
xterm\*|rxvt\*)  
PS1="\[\\e\]0;${debian\_chroot:+($debian\_chroot)}\\u@\\h: \\w\\a\]$PS1"  
;;  
\*)  
;;  
esac

enable color support of ls and also add handy aliases
=====================================================

if \[ -x /usr/bin/dircolors \]; then  
test -r ~/.dircolors && eval “$(dircolors -b ~/.dircolors)” || eval “$(dircolors -b)”  
alias ls=‘ls --color=auto’  
#alias dir=‘dir --color=auto’  
#alias vdir='vdir :$PATH  
export LD\_LIBRARY\_PATH=$GAUSSHOME/lib:$LD\_LIBRARY\_PATH  
export PGDATA=/var/lib/opengauss/data  
#alias fgrep=‘fgrep --color=auto’  
#alias egrep=‘egrep --color=auto’  
fi

colored GCC warnings and errors
===============================

#export GCC\_COLORS=‘error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01’

some more ls aliases
====================

#alias ll=‘ls -l’  
#alias la=‘ls -A’  
#alias l=‘ls -CF’

Alias definitions.
==================

You may want to put all your additions into a separate file like
================================================================

~/.bash\_aliases, instead of adding them here directly.
=======================================================

See /usr/share/doc/bash-doc/examples in the bash-doc package.
=============================================================

if \[ -f ~/.bash\_aliases \]; then  
. ~/.bash\_aliases  
fi

enable programmable completion features (you don’t need to enable
=================================================================

this, if it’s already enabled in /etc/bash.bashrc and /etc/profile
==================================================================

sources /etc/bash.bashrc).
==========================

if ! shopt -oq posix; then  
if \[ -f /usr/share/bash-completion/bash\_completion \]; then  
. /usr/share/bash-completion/bash\_completion  
elif \[ -f /etc/bash\_completion \]; then  
. /etc/bash\_completion  
fi  
fi  
export GAUSSHOME=/usr/local/opengauss  
export PATH=$GAUSSHOME/binomm@modb:~$

export PGDATA=/var/lib/opengauss/data

5.在gsql中查看数据文件目录、数据库版本

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 ;  
omm=# data\_directory
----------------------------------------------------

/var/lib/opengauss/data  
(1 row)

select version();  
version

* * *

* * *

(openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr on aarch64-u  
nknown-linux-gnu, compiled by g++ (GCC) 7.3.0, 64-bit  
(1 row)