Обсуждение: best way to choose index to cluster on?

I am looking to squeeze a bit more speed out of my database by clustering most of my tables.  However, on tables with multiple indexes, how is the best way to choose the index.  I am thinking I want to use the index with the largest pg_stat_user_indexes.idx_tup_read.  Would this be correct?  If not, what column(s) and views should I be looking at to find the most popular index?

Secondly, I have some partial indexes on a very active table, and it tends to have the highest idx_tup_read for that table.  Is is possible to cluster on a partial index?

Thanks,

Chris

Note that PostgreSQL doesn't auto-update clustered indexes.  i.e. they
deteriorate over time, and require being re-clustered after a while.

On Mon, 2006-09-25 at 17:27, adey wrote:
> A good guide for a clustered index is:-
> Will the index be unique, static and narrow.
> If not, avoid clustered indexing as they require extra work on disk to
> maintain their sequence.
>
>
> On 9/26/06, Chris Hoover <revoohc@gmail.com> wrote:
>         I am looking to squeeze a bit more speed out of my database by
>         clustering most of my tables.  However, on tables with
>         multiple indexes, how is the best way to choose the index.  I
>         am thinking I want to use the index with the largest
>         pg_stat_user_indexes.idx_tup_read.  Would this be correct?  If
>         not, what column(s) and views should I be looking at to find
>         the most popular index?
>
>         Secondly, I have some partial indexes on a very active table,
>         and it tends to have the highest idx_tup_read for that table.
>         Is is possible to cluster on a partial index?
>
>         Thanks,
>
>         Chris
>