Re: [PERFORM] Index/Foreign Key Question

On Fri, 2003-10-10 at 16:04, David Busby wrote:
> List,
> I'm creating this multi company POS database.
> My inventory table looks like (all items are unique):
>
> id,category_id,invoice_id,x,y,z,gid,uid
>
> I have a primary key on id, and then an foreign keys on category_id and
> invoice_id.
> GID is the group ID of the company, UID is the companies user, they are also
> connected via foreign key to the respective tables. My question is this: Do
> I need to create more indexes on this table when inventory selects look like
>
> select * from inventory where
> category_id = 1 and invoice_id is null and gid = 2
>
> So where would the indexes need to be placed? Or since I have the FK setup
> are the indexes already in place? I expect to soon have >500K items in the
> inventory table and don't want it to slow down. I'll have the same type of
> issue with clients, invoices, purchase_orders and perhaps more

I'd make a multi-segment (non-unique?) index on:
GID
CATEGORY_ID
INVOICE_ID

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Ron Johnson, Jr. ron(dot)l(dot)johnson(at)cox(dot)net
Jefferson, LA USA

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