RE: Design Question
- From: "Kenneth Naim" <kennaim@xxxxxxxxx>
- To: <Muru.Balakrishnan@xxxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 16 Oct 2009 13:27:02 -0400
I'll provide the consultant answer. It depends. If this is a datawarehouse
then less joins and keep values in line is better. If this is an OLTP system
then use a lookup table.
Ken
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Balakrishnan, Muru
Sent: Friday, October 16, 2009 12:58 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Design Question
Hello Experts,
I request your opinion on, whether column values in large tables with more
than million rows should be codified for better performance. For example a
customer table could have following columns, gender and card type. In our
team many prefer to spell out the entire word for every row (as Male,
Female, Credit Card, Debit Card etc), but my recommendation is to codify (M,
F, C, D, etc) with a lookup tables when needed. Their argument is, hardware
is cheap including storage, helps readability and less joins. My argument
is, production hardware is not cheap (we can buy 1TB for home under $100,
but production hardware costs thousands), less overall blocks used improves
performance, negligible problem with joining lookup tables. Please give your
opinion.
Gender
---------
M vs Male
F vs Female
Card type
-------------
C vs Credit Card
D vs Debit Card,
P vs Prepaid Card
Thanks in advance,
Muru
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