Re: pg_class.relpages

On Sat, Sep 27, 2003 at 08:26:16PM -0400, Bruce Momjian wrote:
> Bertrand Petit wrote:
> >
> > Does the figures stored in pg_class.relpages include the pages
> > consumed by the toast tables linked to a normal table?
>
> No. See the chapter on monitoring disk space for more information.

Okay. I eventually wrote the following query that lists tables
and indices sizes. A view similar to this query might my useful for
the general public if defined in the information schema.

SELECT pg_namespace.nspname AS schema,
COALESCE((SELECT class3.relname
FROM pg_class AS class3, pg_index
WHERE class1.oid=pg_index.indexrelid AND
class3.oid=pg_index.indrelid),
class1.relname) AS table,
CASE
WHEN class1.relkind='r' THEN NULL
ELSE class1.relname
END AS index,
(SELECT COALESCE(class1.relpages+SUM(class2.relpages),
class1.relpages) * 8
FROM pg_class AS class2
WHERE class2.oid IN (class1.reltoastrelid,
class1.reltoastidxid)) AS size
FROM pg_class AS class1, pg_namespace
WHERE class1.relnamespace = pg_namespace.oid AND
pg_namespace.nspname NOT IN ('pg_catalog',
'information_schema',
'pg_toast') AND
class1.relkind IN ('r', 'i')
ORDER BY class1.relnamespace ASC, class1.relname ASC,
class1.relkind DESC

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