Re: Minmax indexes

> On 16 September 2013 at 11:03 Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>
> wrote:

>
> Something like this seems completely sensible to me:
>
> create index i_accounts on accounts using minmax (ts) where valid = true;
>
> The situation where that would be useful is if 'valid' accounts are
> fairly well clustered, but invalid ones are scattered all over the
> table. The minimum and maximum stoed in the index would only concern
> valid accounts.

Here's one that occurs to me:

CREATE INDEX i_billing_id_mm ON billing(id) WHERE paid_in_full IS NOT TRUE;

Note that this would be a frequently moving target and over years of billing,
the subset would be quite small compared to the full system (imagine, say, 50k
rows out of 20M).

Best Wises,
Chris Travers
>
> - Heikki
>
>
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Best Wishes,
Chris Travers
http://www.2ndquadrant.com
PostgreSQL Services, Training, and Support