升级CentOS5.4,修改Postgresql二三事

##5.4 出了,升级吧 ;-)
yum upgrade

##等待

##
lsb_release  -a
LSB Version:	:core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID:	CentOS
Description:	CentOS release 5.4 (Final)
Release:	5.4
Codename:	Final
yes!

##基于文件系统的Postgresql恢复,遇到postmarster读取postgresql.conf permission dennied
## 修改SElinux配置文件,关闭selinux,
修改和关闭selinux的两种办法：

1 在lilo 或者  grub的启动参数中增加：selinux=0
2 修改  /etc/selinux/config文件（redhat 类似系统下)

## 后遭遇版本不一致不能恢复...
uname -a
##  杂念,备忘

##

--- Check the dbsize on postgresql

SELECT
    pg_database.datname,
    pg_size_pretty(pg_database_size(pg_database.datname))
        AS size FROM pg_database;