Re: Index advisor advising index on primary key

[vhamberg@xxxxxxxxxxx]

Jeff

AFAIK, a primary key IS a unique index - it is still and index under the covers, although it might not get listed in very obvious ways. You CAN see the object size of the table be bigger when you have one, however.

Vern

-------------- Original message -------------- 
From: Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx> 

> Oooh. So if I did an ALTER TABLE and added a UNIQUE constraint on this 
> file, that might do it? 
>
> Mark S. Waterbury wrote: 
> > Hi, Jeff: 
> >
> > You said "primary key" but did not indicate whether this column has a 
> > "unique" constraint? 
> >
> > (I know that when you add a unique constraint to a table or file it 
> > creates an index (access path) under the covers.) 
> >
> > Mark 
> >
> > > Jeff Crosby wrote: 
> >
> > > ...(snip)... 
> > > On our item master file, it is advising that I create an index on field 
> > > ITNBR. This file is an SQL table created via DDL (not DDS) and ITNBR is 
> > > the primary key. Does this advice make sense? Why would it advise an 
> > > index on the primary key? 
>
> -- 
> Jeff Crosby 
> UniPro Foodservice/Dilgard 
> 260-422-7531 
> Opinions expressed are my own and not necessarily those of my company. Unless I 
> say so. 
>
>
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