> foo=# \d pg_attribute_relid_attnam_index
> Index "pg_attribute_relid_attnam_index"
> Attribute | Type
> -----------+------
> attrelid | oid
> attname | name
> unique btree
>
> foo=# \d pg_attribute_relid_attnum_index
> Index "pg_attribute_relid_attnum_index"
> Attribute | Type
> -----------+----------
> attrelid | oid
> attnum | smallint
> unique btree
>
> Since table OIDs keep increasing, this formulation ensures that new
> entries will always sort to the end of the index, and so space freed
> internally in the indexes can never get re-used. Swapping the column
> order may eliminate that problem --- but I'm not sure what if any
> speed penalty would be incurred. Thoughts anyone?
Isn't pg_attribute often accessed with a "where oid=xxx" restriction
to get all cols for a given table ?
Andreas