85 million row table, key was coupon code and "used/unused" flag ....
updates were done in batches as the coupons were processed. We did NOT
have performance problems. We didn't have to worry about the FK index
as it was a standalone table.
No gotchas under the conditions we used it.
I see scattered implementations of IOTs here and again, all I hear are
good things about it (other than the "index" is in the "data"
tablespace.... running and ducking now!)
- Daniel Fink <Daniel.Fink_at_Sun.COM> wrote:
> We are looking to implement IOTs for a couple of intersection
> entities in a 10g db. I would like to hear from those brave
> enough to actually use IOTs what is the good, the bad and the
> ugly.
>
> example:
>
> Employee (heap table)
> Project (heap table)
>
> There is a many-to-many relationship between the tables (1
> employee can be on many projects and 1 project can have many
> employees).
>
> The emp_project table is the intersection entity containing
> emp_id and project_id as the only columns. There are FK
> constraints on each of the columns. The combination of emp_id
> and project_id is unique.
>
> This situation *sounds* like the right one for an IOT,
> otherwise we would have 1 table and 2 indexes (1 on each
> column).
>
> My main concerns are:
> 1) Integrity/performance
> 2) Locking behavior (do I need to adhere to the traditional
> "index all foreign keys" rule to prevent excessive locking?)
> 3) Any especially nasty gotchas
>
> Thanks,
> Daniel
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Received on Wed Apr 28 2004 - 09:55:14 CDT
