how to design

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how to design

molecule_kaab

SSC Eights!

Points: 826
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March 10, 2008 at 1:30 pm

#179818

I'm very new for designing job
how many design style in present?
I know there are general design which includes DFD and ERD together
and another style is OO which includes USECASE, CLASS DIAGRAM, ...
what I know is correct or not ?
I know that DFD is for designing data that comming in and out the process
ERD for database designing
And I know other thing else, but don't have clear understanding about it
USECASE for ....
SEQUENTIAL DIAGRAM for....
ACTIVITY DIAGRAM for....
so I'm very confuse now
Can anyone give me some clearly understand for this
thank you very much 😀

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Jeff Moden SSC Guru Points: 1004406 More actions · Answer 1

Ummmm... let me get this straight... you got a job as a designer and you don't really know how to design?

--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.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Grant Fritchey SSC Guru Points: 398909 More actions · Answer 2

That's a huge collection of really fundamental questions that just aren't going to be answered easily in a little post in a discussion group.

In terms of database design, you should pick up Fleming & von Halle's "Handbook of Relational Database Design." It will go over a lot of the questions you have, but not all. I don't have a good reference to recommend for fundamental software design, but do a search on Amazon and you'll come up with something.

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

Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning

Jeff Moden SSC Guru Points: 1004406 More actions · Answer 3

Definitely not a trivial topic... and I haven't really found a good "starter" book on database design except for maybe some of the topics in Books Online. Before you do any database designing, Google "3rd normal form" and memorize it, the 1st two forms, and when you might want to use any of the 3. Lookup "Star" and "Snowflake" schemas... learn the advantages and disadvantages of each and how to "blend" the two for better performance and ease of maintenance. Then lookup indexing and DRI (Declared Referential Integity, ie Primary/Foreign Keys) and study the heck out of that subject being sure to truly understand the real differences between clustered and non-clustered indexes and how they impact performance. Then, create a couple of million row test tables and start trying to figure what performance actually means.

Last but not least, hang around this forum and answer some questions... best way to learn is to do.

--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.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Big Data Man SSCrazy Eights Points: 8536 More actions · Answer 4

hey,

Sound like you have just completed a software application design course and trying to piece together the different phases of development. If SQL Server is your RDBMS of choice for physical design, you may want to look at this book "Pro SQL Server 2005 Database Design and Optimization", which touches on some of the life cycle phases.

As Jeff and Grant's have already commented, there a lot to cover, so start with 3rd normal form, which will at least get you understanding basic DB design principals (e.g. ERD) and just absorb as much as you can, but test your understanding at each topic by "doing it", not just reading it.

Good luck!

Thanks,

Phillip Cox

MCITP - DBAdmin

liebesiech SSCrazy Points: 2610 More actions · Answer 5

Get some books about fundamental software development techniques.

Just as an example: Systems Analysis & Design Methods from Whitten Bentley ISBN-13: 978-0-07-305233-5 (www.mhhe.com/whitten). Good book for students covers traditional (data) analysis methods and OO Design fundamentals.

Have fun. 🙂

cs_troyk SSCertifiable Points: 5383 More actions · Answer 6

One book that I recommend that will cover the various design artifacts besides just those from "the database world" is David Hay's Requirements Analysis From Business Views to Architecture.

As for getting more in depth on db design, the above suggestions are spot-on, and I'll also take the opportunity to shamelessly plug my short article on the topic:

http://www.sqlservercentral.com/articles/Data+Modeling/61817/

HTH,

TroyK

Loner SSC-Insane Points: 21279 More actions · Answer 7

What are you trying to design anyway? a database model, a data flow diagram, a business model ?

molecule_kaab SSC Eights! Points: 826 More actions · Answer 8

Thank you, everyone

Actually I'm still a student. And as Phillip Cox said, I'm just finish the System analysis and design course.

I have learned many model, so I'm very confuse. Thank you for your recommends, I'll find out it 😛