Postgresql默认数据文件地址为/var/lib/pgsql/*,修改步骤如下：

1. Create new dir,here is /Alkheme/pgsql
2. Change own to postgres:postgres. "chown -R postgres:postgres pgsql/"
3. su postgres and initial data dir "initdb /Alkheme/pgsql"
4. Change lines in file /etc/init.d/postgres

"PGDATA=/Alkheme/pgsql/

PGLOG=/Alkheme/pgsql/pgstartup.log