Postgresql基础

PostgreSQL is available in all Ubuntu versions by default.

Install

sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get -y install postgresql

安装完毕后，系统会创建一个数据库超级用户 postgres，密码为空。

使用新DB目录

mkdir -p /u01/pgdb
chown -R postgres:postgres /u01/pgdb
/usr/lib/postgresql/15/bin/initdb /u01/pgdb

/usr/lib/postgresql/15/bin/pg_ctl -D /u01/pgdb -l logfile start

DBA

Start

# 需要 root 权限
/etc/init.d/postgresql start | stop | restart
systemctl start | stop | restart | status postgresql
# 指定DB目录
/usr/lib/postgresql/15/bin/pg_ctl -D /u01/pgdb -l logfile start

查看数据库文件目录

show data_directory;

查看数据库版本

show server_version;
select version();
psql --version

执行SQL

psql -c "$SQL"

show databases

\l
select * from pg_database;

connect databases

\c postgres

show tables

\dt
\dt+           # 表类型、大小