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normalization vs de-normalization ?
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normalization vs de-normalization ?
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fearghalreilly
fearghalreilly
Posted Wednesday, January 09, 2013 8:57 PM
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Last Login: Tuesday, January 15, 2013 10:16 PM
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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
Post #1405149
Michael Valentine Jones
Michael Valentine Jones
Posted Wednesday, January 09, 2013 9:07 PM
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So what did you answer?
What do you think the answer is?
Post #1405152
fearghalreilly
fearghalreilly
Posted Wednesday, January 09, 2013 9:11 PM
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i went with answer B but not fully sure if it was the correct decision ....
Post #1405153
Lynn Pettis
Lynn Pettis
Posted Wednesday, January 09, 2013 10:43 PM
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I may be wrong (meaning I misunderstood the answers), but I would go with E (None of the above).
Lynn Pettis
For better assistance in answering your questions, click here
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or
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Post #1405178
opc.three
opc.three
Posted Thursday, January 10, 2013 5:21 AM
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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
Believe you can and you're halfway there.
--Theodore Roosevelt
Everything Should Be Made as Simple as Possible, But Not Simpler
--Albert Einstein
The significant problems we face cannot be solved at the same level of thinking we were at when we created them.
--Albert Einstein
1 apple is not exactly 1/8 of 8 apples. Because there are no absolutely identical apples.
--Giordy
Post #1405359
GilaMonster
GilaMonster
Posted Thursday, January 10, 2013 5:52 AM
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Where are these test questions from?
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
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
Post #1405365
Grant Fritchey
Grant Fritchey
Posted Thursday, January 10, 2013 7:12 AM
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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 2012 Query Performance Tuning
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Red Gate Software
Post #1405422
Jeff Moden
Jeff Moden
Posted Thursday, January 10, 2013 7:19 AM
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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 "
R
ow-
B
y-
A
gonizing-
R
ow".
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."
For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/
For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Post #1405428
Lynn Pettis
Lynn Pettis
Posted Thursday, January 10, 2013 8:03 AM
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If these questions are from a MS test, shoot the test writer. None of the answers really make sense.
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)
Post #1405477
opc.three
opc.three
Posted Thursday, January 10, 2013 8:35 AM
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Last Login: Today @ 6:57 PM
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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
__________________________________________________________________________________________________
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato
Believe you can and you're halfway there.
--Theodore Roosevelt
Everything Should Be Made as Simple as Possible, But Not Simpler
--Albert Einstein
The significant problems we face cannot be solved at the same level of thinking we were at when we created them.
--Albert Einstein
1 apple is not exactly 1/8 of 8 apples. Because there are no absolutely identical apples.
--Giordy
Post #1405498
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