> On 16 September 2013 at 11:03 Heikki Linnakangas <hlinnakangas@vmware.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
