Re: ToDo List Item - System Table Index Clustering

Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Wed, Jan 19, 2011 at 3:10 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Well, on my machine pg_description is about 210K (per database) as of
>> HEAD. 90% of its contents are pg_proc entries, though I have no good
>> fix on how much of that is for internal-use-only functions. A very
>> rough estimate from counting pg_proc and pg_operator entries suggests
>> that the answer might be "about a third". So if we do what was said in
>> the above-cited thread, ie move existing comments to pg_operator and
>> add boilerplate ones to pg_proc, we probably would pay <100K for it.

> I guess that's not enormously expensive, but it's not insignificant
> either. On my machine, a template database is 5.5MB.

The implementation I was thinking about was to have initdb run a SQL
command that would do something like

INSERT INTO pg_description
SELECT oprcode, 'pg_proc'::regclass, 0, 'implementation of ' || oprname
FROM pg_operator
WHERE theres-not-already-a-description-of-the-oprcode-function

So it would be minimal work to either provide or omit the boilerplate
descriptions. I think we can postpone the decision till we have a
closer fix on the number of entries we're talking about.

regards, tom lane