Re: free space map

Chris Hoover wrote:
> Is there anyway to query the free space map and see  how many entries there
> are for a specific table?
>
> We are starting to have some performance issues since our upgrade to
> 8.1(running
> 8.1.3).  However I can vacuum one table and the issues are temporarily
> solved.  I am trying to do some research and would like to know what the fsm
> looks like before and after I vacuum this table.

In CVS HEAD there is a pg_freespacemap contrib module that may do what
you need.  You'd have to "backport" it to 8.1 though; it doesn't compile
as-is.

--
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support