> So if I understand correctly I could ditch the 'deleted' field entirely and
> use just the 'deleteddate' field. This 'deleteddate' field would be NULL by
> default. It would contain a date value if the record is considered
> 'deleted'.
>
> The index would be 'create index a on tablename(deleteddate) where
> deleteddate is null'.
>
> I could then access 'current' records with a view like 'create view x_view
> as select * from tablename where deleteddate is null'.
>
> Is that correct? This would be the best performing solution for this kind of
> thing, I think (theoretically at least)?
>
> Kind regards,
> Alexander Priem.
Near, but not exactly. You don't need field deleted - it's true.
Your example:
create index a on tablename(deleteddate) where deleteddate is null
we can translate to:
create index a on tablename(NULL) where deleteddate is null
which doesn't make too much sense.
Check your queries. You probably have something like this:
select * from tablename where not deleted and xxx
Create your index to match xxx clause - if xxx is "some_id=13", then
create your index as:
create index on tablename(some_id) where deleteddate is null;
Regards,
Tomasz Myrta
