[dba-SQLServer] Fwd: SQL Server Primary Key

I would probably just unique index on telephone number and datetime field,
definitely looks like a log table as was involved in helping a friend a
couple of years back who's company helps look after O2...

Paul


On 3 September 2014 15:11, Susan Harkins <ssharkins at gmail.com> wrote:

> I don't know -- that's why I'm asking you guys! That's some keen insight --
> you might be right!
>
> Susan H.
>
>
> On Wed, Sep 3, 2014 at 10:08 AM, Gustav Brock <gustav at cactus.dk> wrote:
>
> > Hi Susan
> >
> > It sounds like a log table. Does he need a PK at all?
> > A unique index on the call start field should do it.
> >
> > /gustav
> >
> > -----Oprindelig meddelelse-----
> > Fra: dba-sqlserver-bounces at databaseadvisors.com [mailto:
> > dba-sqlserver-bounces at databaseadvisors.com] På vegne af Susan Harkins
> > Sendt: 3. september 2014 16:02
> > Til: Discussion concerning MS SQL Server
> > Emne: [dba-SQLServer] Fwd: SQL Server Primary Key
> >
> > This is from a reader -- seriously over my head. Anyone want to offer
> some
> > advice?
> >
> > Susan H.
> >
> >
> > On Wed, Sep 3, 2014 at 4:02 AM, Phillip Smith <phillip at creamcow.com>
> > wrote:
> >
> > > Hi Susan,
> > > Just reading your post regarding using the right Primary Key. I'm
> > > building a rehouse to store telephone data. Each phone record can be
> > > uniquely identified by the DateTime2(7) start time of the call because
> > > each record is guaranteed to be created in a different 100 nano second
> > > window. There are 100 million records. The main way to view data is
> > chronological order.
> > > I'm trying to decide whether to use the CallStart datetime2(7) field
> > > for the primary key. I can cluster on this key and join to my bridging
> > > tables using this key. Or should I crate a CallId (Bigint) that
> > > encodes the datetim, Maybe in yymmddhhmmssnnnnnnn format. You have
> > > stated on your post that there is an overhead to using Datetime type
> > > as the primary key. Is this true for my scenario?
> > > Best regards
> > >
> > > Phillip
> >
> >
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> >
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-- 
Paul Hartland
paul.hartland at googlemail.com