Re: Disk space usage analyzer?

> -----Original Message-----
> From: pgsql-general-owner(at)postgresql(dot)org [mailto:pgsql-general-
> owner(at)postgresql(dot)org] On Behalf Of Steve Crawford
> Sent: Monday, March 28, 2011 12:22 PM
> To: Yang Zhang
> Cc: pgsql-general(at)postgresql(dot)org
> Subject: Re: [GENERAL] Disk space usage analyzer?
>
> On 03/25/2011 07:58 PM, Yang Zhang wrote:
> > Is there any tool for breaking down how much disk space is used by
> > (could be freed by removing) various tables, indexes, selected rows,
> > etc.? Thanks!
> >
>
> You can use the pg_class table and the pg_relation_size (and optionally
> the pg_size_pretty) functions to get that info. This query gives table
> sizes and percent of overall usage.
>
> BUT! It is only looking at tables, not indexes. If you want to know how
> much space will be freed by dropping a table, you will have to modify
> this query to total up the index space used for all the indexes
> associated with each table.

pg_total_relation_size() will give you the size of the table and the indexes on it.

Brad.