Re: A thought on Index Organized Tables

Gokulakannan Somasundaram wrote:
> Hi,
> As you all know, Index Organized tables are a way by which we can
> automatically cluster the data based on the primary key. While i was
> thinking about an implementation for postgres, it looks like an impossible
> with the current ideologies. In an IOT, if a record gets updated, we need to
> mark the old row as deleted immediately, as we do with any other table. But
> since Postgres supports user defined data types and if they happen to be a
> broken data type, then we have an unstable IOT.(as there is no guarantee, we
> might hit the same record)
> This was the reason for which, the proposal on creating indexes with
> snapshot was rejected.
> May i get a little clarification on this issue? Will we be supporting
> the IOT feature in postgres in future?

What seems like the best path to achieve the kind of performance
benefits that IOTs offer is allowing index-only-scans using the
visibility map. I worked on that last summer, but unfortunately didn't
have the time to finish anything.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com