Re: Primary key type selection

Winnie, u've tested that theory that a number scan as a PK will be faster than a character scan(varchar2)?, i'd like to see the results :)

joe

Winnie Liu wrote:

> Colin,
>
> That's right. The number field occupied varies as varchar2. But still, with
> the same width, it is a lot faster to scan and match a primary key of
> numbers than a primary key with characters.
>
> Winnie :)
>
> -----Original Message-----
> Colin.Shaw_at_phs.com
> Sent: Monday, May 15, 2000 9:28 PM
> To: Multiple recipients of list ORACLE-L
>
> >A number field takes less no. of bytes than a varchar2 field.
>
> Not necessarily. A number field occupies a variable number of bytes,
> depending on its magnitude and number of digits.
>
> Colin.
>
> -----Original Message-----
> Sent: Sunday, May 14, 2000 9:14 PM
> To: Multiple recipients of list ORACLE-L
>
> Hi,
>
> The first advantage is the space saving. A number field takes less no.
> of bytes than a varchar2 field. This decrease in storage may
> positively impact performance...
>
> Regards
> Rajagopal Venkataramany
>
> ----Original Message Follows----
> Reply-To: ORACLE-L_at_fatcity.com
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Date: Sun, 14 May 2000 10:54:12 -0800
>
> Is there any advantages and disadvantages (performance? , ...) between
> NUMBER and VARCHAR2 for primary key column?
>
> Alex Hillman
>
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> --
> Author: Rajagopal Venkataramany
> INET: rajagopalvr_at_hotmail.com
>
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> Author: Winnie Liu
> INET: hkitty_at_earthlink.net
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Received on Tue May 16 2000 - 12:25:14 CDT