元命令 \timing  \watch 

 \timing  显示执行时间‘

 psql客户端提示符

mydb=# \echo :PROMPT1
%/%R%#

%/ 当前数据库名称

%R 显示 = 

%#  超级用户显示 >  普通用户显示 #

%M 数据库服务器别名

%> 数据库端口号

%/@%M:%>%R%#

将PROMPT1 的设置写进 .psqlrc文件，连接数据库库时自动读 .psqlrc文件

[postgres@s101 /var/lib/pgsql]$nano  ~/.psqlrc

添加

\set  PROMPT1  '%/@%M:%>%R%#'

设置前
[postgres@s101 /home/centos]$psql -U postgres -d postgres -p 5432
could not change directory to "/home/centos"
psql (9.2.24, server 13.3)
WARNING: psql version 9.2, server version 13.0.
         Some psql features might not work.
Type "help" for help.

postgres=# 



设置后
[postgres@s101 /home/centos]$psql -h 192.168.17.101  -U postgres -d postgres -p 5432
could not change directory to "/home/centos"
psql (9.2.24, server 13.3)
WARNING: psql version 9.2, server version 13.0.
         Some psql features might not work.
Type "help" for help.

postgres@192.168.17.101:5432=#