SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


normalization vs de-normalization ?


normalization vs de-normalization ?

Author
Message
fearghalreilly
fearghalreilly
SSC Rookie
SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)

Group: General Forum Members
Points: 26 Visits: 8
In a recent test i was asked this question

when considering normalization vs de-normalization which of the following statements are correct?

A)normalizations speeds up data retrieval at the expense of data modifications
B) de-normalization speeds up data modifications at the expense of data retrieval
C)normalization is the process of putting one fact in numerous places
D)de normalization is the process of putting one fact in one place
E)none of the above
Michael Valentine Jones
Michael Valentine Jones
SSCoach
SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)

Group: General Forum Members
Points: 15171 Visits: 11848
So what did you answer?

What do you think the answer is?
fearghalreilly
fearghalreilly
SSC Rookie
SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)SSC Rookie (26 reputation)

Group: General Forum Members
Points: 26 Visits: 8
i went with answer B but not fully sure if it was the correct decision ....
Lynn Pettis
Lynn Pettis
SSC Guru
SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)

Group: General Forum Members
Points: 98698 Visits: 38996
I may be wrong (meaning I misunderstood the answers), but I would go with E (None of the above).

Cool
Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
Managing Transaction Logs

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
Orlando Colamatteo
Orlando Colamatteo
SSC-Forever
SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)

Group: General Forum Members
Points: 41728 Visits: 14413
Looks like A and B are polar opposites, as are C and D, so if only one choice could be correct then I would also go with E.

__________________________________________________________________________________________________
There are no special teachers of virtue, because virtue is taught by the whole community. --Plato
GilaMonster
GilaMonster
SSC Guru
SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)

Group: General Forum Members
Points: 234247 Visits: 46368
Where are these test questions from?

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


Grant Fritchey
Grant Fritchey
SSC Guru
SSC Guru (101K reputation)SSC Guru (101K reputation)SSC Guru (101K reputation)SSC Guru (101K reputation)SSC Guru (101K reputation)SSC Guru (101K reputation)SSC Guru (101K reputation)SSC Guru (101K reputation)

Group: General Forum Members
Points: 101409 Visits: 33014
I'm not comfortable with any of those answers. A is somewhat true, but so is B. I'd have to choose E if pushed, but I'd want to have a long discussion about it. This test seems seriously messed up. What's it for?

----------------------------------------------------
The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood...
Theodore Roosevelt

The Scary DBA
Author of: SQL Server Query Performance Tuning and SQL Server Execution Plans
Product Evangelist for Red Gate Software
Jeff Moden
Jeff Moden
SSC Guru
SSC Guru (223K reputation)SSC Guru (223K reputation)SSC Guru (223K reputation)SSC Guru (223K reputation)SSC Guru (223K reputation)SSC Guru (223K reputation)SSC Guru (223K reputation)SSC Guru (223K reputation)

Group: General Forum Members
Points: 223106 Visits: 42003
I'm with Gail... this type of post seems to be becoming a habit with you. Where are these questions coming from? If they're coming from a MS test, I'd like to remind you that you agreed not to disclose the content of the test and you should stop posting them NOW.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
Lynn Pettis
Lynn Pettis
SSC Guru
SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)SSC Guru (98K reputation)

Group: General Forum Members
Points: 98698 Visits: 38996
If these questions are from a MS test, shoot the test writer. None of the answers really make sense.

Cool
Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
Managing Transaction Logs

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
Orlando Colamatteo
Orlando Colamatteo
SSC-Forever
SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)SSC-Forever (41K reputation)

Group: General Forum Members
Points: 41728 Visits: 14413
Agreed, not about shooting the test writer but about the nonsensical options. You literally have to rule out all the real choices based on how ambiguous they are. "Compare and contrast normalization and de-normalization with respect to data modifications and the expense of data retrieval."

Now that's a solid question, albeit that approach tends to fall down when writing a multiple choice exam :-D

__________________________________________________________________________________________________
There are no special teachers of virtue, because virtue is taught by the whole community. --Plato
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search