On Tue, Jan 12, 2010 at 7:17 AM, Greg Smith <greg@xxxxxxxxxxxxxxx> wrote:
AI Rumman wrote:You don't put things in pg_tblspace yourself; that directory is for the database to manage. Your tablespace should be somewhere completely outside of /var/lib/pgsql/data altogether.
I used the followings:
create tablespace mytabspc location '/var/lib/pgsql/data/pg_tblspc';
create database mydb with tablespace=mytabspc;
drop database mydb;
drop tablespace mytabspc;
ERROR: tablspace 'mytabspc' is not empty
Please tell me why?
Tablespaces in postgres are quite a bit different from Oracle. In Oracle, you define a tablespace to be a location that uses one or more datafiles, and everything belongs in a tablespace.
In postgres, a tablespace is not required. It is nothing more than a directory on some filesystem that you tell postgres about so that you can store relations in it. If you don't define a tablespace in postgres, all of your relations are going to be located in /var/lib/pgsql/base.
That's the difference, you don't NEED a tablespace like Oracle, you'll only use them in postgres when you're trying to store data in postgres on a different mountpoint.
Hope this helps.
--Scott
