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Re: GSoC - proposal - Materialized Views in PostgreSQL

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: pavelbaros <baros(dot)p(at)seznam(dot)cz>, Greg Smith <greg(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: GSoC - proposal - Materialized Views in PostgreSQL
Date: 2010-04-12 05:13:20
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Lists: pgsql-hackers
Robert Haas wrote:
> On Sun, Apr 11, 2010 at 10:26 AM, Heikki Linnakangas
> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>> Robert Haas wrote:
>>> 2010/4/10 Andrew Dunstan <andrew(at)dunslane(dot)net>:
>>>> Heikki Linnakangas wrote:
>>>>> 1. Keep the materialized view up-to-date when the base tables change.
>>>>> This can be further divided into many steps, you can begin by supporting
>>>>> automatic updates only on very simple views with e.g a single table and
>>>>> a where clause. Then extend that to support joins, aggregates,
>>>>> subqueries etc. Keeping it really limited, you could even require the
>>>>> user to write the required triggers himself.
>>>> That last bit doesn't strike me as much of an advance. Isn't the whole point
>>>> of this to automate it? Creating greedy materialized views is usually not
>>>> terribly difficult now, but you do have to write the triggers.
>>> Yeah, I agree.
>> It doesn't accomplish anything interesting on its own. But if you do the
>> planner changes to automatically use the materialized view to satisfy
>> queries (item 2. in my previous email), it's useful.
> But you can't do that with a snapshot view, only a continuous updated one.

A materialized view with manually-defined triggers to keep it up-to-date
is a continuously updated one.

Other DBMSs allow that with snapshot views too, you just don't get
totally up-to-date results, but I not sure we want to go there.

  Heikki Linnakangas

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