Are there any (dis)advantages in building a universe on fully normalized tables instead of building dimensional model/tables and then universe on top of them?

Hello,
I’m hoping someone can help me with understanding advantages and disadvantages if we want to build a universe on top of a fully normalized tables, compared to using a dimensional model with star schemas.
I’ve read some discussions here that say that it is possible to create a universe on top of normalized tables. Then, can we avoid building of dimensional tables (a data mart), and just use normalized tables? I would say that it is easier to use star schema dimensions and facts tables to build a universe, but our end users might ask “why do we have to go through building a dimensional data mart, if we can have same reports with hierarchies and drill-down functionality based on a universe built on top of our already existing normalized tables?”
Can you point me to some established best practices regarding using normalized tables to build a universe? Any documents with some examples for this?
Any expected difficulties during design/development phase of our universe, related to using normalized tables?
Any expected performance degradation if we use normalized tables compared to using dimensional tables?
Can I build universe more easily if I transform (modify) our normalized model (by using alias tables and views) to look like snowflake model?
I’m using BOE XI 3.1, tables are in Oracle 11.2.
Thank you

Few Disadvantages that I usually face when building universe on Normalized tables,
1. Performance - Read operations have to suffer because indexing strategies do not go well with table joins
2. Derived Tables - Due to complex Queries/ Logic, most of the time, end-up creating derived tables, which doesn't use back-end table indexes and slows down the report runtime.
3. Normalized table/ Transaction tables may not always have proper cardinality and often results in Cartesian products
4. Normalized tables may not have tight referential integrity and may have to join more than one column and join on varchar, etc whereas, good Dimensional model datawarehouse will have proper keys/ integer joins and not always necessary to join on multiple fields
5. Often deal with Fan and Chasm Traps
6. Dealing with Database fields with nulls, blanks, date in numeric format, etc.,
7. No Facts, Dimensions separated and most of the time they are in same table
and More...
If performance is not a matter and building Datawarehouse is a big deal, then I will start building Universe on normalized tables by having the database diagram as reference for Joins, contexts, etc
Note: After dealing with universes based on normalized tables for few years (by creating views, complex sql queries data loading to tables and unv on these tables, derived tables), I ended up creating star-schema dimensional model (couple of months extra ETL work), users/ developers felt lot better when they have to create standard/ ad-hoc reports and they are super fast compared to previous universes.

Similar Messages

Are there any plans to move the "Math Check" to AFTER the O.K. BUTTON is pushed on STEP AND REPEAT?

One of my pet peeves is that I have to clear all the fields in the STEP AND REPEAT dialouge box before I can begin entering information. I have been patiently waiting for this bug to be fixed. I am beginning to wonder if Adobe is even aware of the bug? It drives me nuts to no end!!! I am sure it is responsible for several points in my blood pressure reading on given days. I'll have an object selected that I need to step 7 times and I'll bring up the Step and Repeat dialouge box. I'll enter 7 in the COUNT field. InDesign will in some cases immediately flag the operation as not possible because there are numbers in the other two fields that I haven't had a chance to edit yet that will cause the step and repeat operation to go off the pasteboard. It makes me MAD because it changes my 7 back to a 1 and I have to go and put in the correct values for the VERTICAL and HORIZONTAL offset fields and then I have to go back up to the COUNT field and re-enter my 7. All of this and I haven't even hit the O.K. button yet!!! Can someone at Adobe pleeeeeeaaaaaase inform the programmers of this glitch and have them move the MATH CHECK to AFTER THE O.K. BUTTON is clicked! I wouldn't mind the message if the figures I entered were incorrect and I had hit the O.K. button. But it drives me absolutely insane when it starts trying to correct me before I've even finished entering my values!
Am I the only one?
I would love to hear from anyone else out there that gets frustrated from this. If for no other reason then to let me know I haven't completely lost my sanity yet.
Thanks.
Randy

O.K. Peter. I did go and file a report. I couldn't bring myself though to call it a feature request because I clearly believe it is a bug. A co-worker of mine and I had a long discussion about it. He argued your side of things suggesting that the program was working as the programmers intended for it to be and because of that I couldn't call it a bug. But, I contend that the program IS NOT working as the programmers intended for it to be because if you look at the OBJECT > TRANSFORM > MOVE item in InDesign it also brings up a dialogue box. This dialogue box also has a PREVIEW check box on it. If the PREVIEW check box is checked then it immediately evaluates the numbers as you enter them into the various fields. And if you enter an invalid number it will immediately present the error message. However, if the PREVIEW check box is left unchecked then it waits until you press the O.K. Button before evaluating the numbers and executing the move. The STEP AND REPEAT dialogue box should behave the same way but it doesn't. It behaves as if the PREVIEW check box is checked whether it is or not. So that is a BUG in my humble opinion.
Thanks for your help in pointing me to the correct form. I'm usually so busy working that I never have time to look that kind of stuff up.
Randy

Are there any specific advantages of using Forte's XSLT Processor over other Processor's?

The main advantage is integration into the UDS run-time system. This makes writing applications that perform XSL transformations in TOOL very easy.
You could implement such transformations using one of UDS's many methods for integrating external components. You can then use XSLT processors that support extension mechanisms that you need, or other non-standard features. This would come at the cost of using the external integration mechanism appropriate to the processor. See the "Integrating with External Systems" book in the UDS documentation.

I dropped my brand new iPhone in water and apparently my insurance doesn't cover eater damage. Is there any loop holes to get a new phone without paying full price, Can i upgrade my insurance and then send it in in a week or so?

How long do you have to wait to make in insurance claim.

kaebarber,
We should take a closer look into some options for you. Normally insurance covers water damage. Which insurance do you have? Is it through Verizon Wireless?
VanetrisC_VZW
Follow us on Twitter @vzwsupport

Can I move a Virtual Domain Controller from one host(Win Server 2008 R2) to another (Win Server 2012 R2) ? Are there any issues?

Can I move a Virtual Domain Controller from one host(Win Server 2008 R2) to another (Win Server 2012 R2) ? Are there any issues?

I also had this error: "Setup cannot continue. Your computer will now restart, and your previous version of Windows will be restored."
trying to do a in-place upgrade of a Domain Controller Windows 2008 R2 to Windows 2012 R2.
The problem was the separated System Reserved Partition. After I removed using this instructions:
http://jacobackerman.blogspot.com/2012/12/how-to-remove-system-reserved-partition.html
The upgrade ran ok, and now have my DC as Windows 2012 R2.
Hope that helps!.

Are there any fixes for iPad 2 with OS 8.1.1.

Are there any fixes for the iPad 2 IOS 8.1.1? I've had problems with Safari and other Apps crashing or locking up, and with extremely slow touch response. These problems have been occurring since the last update. At times the iPad becomes unusable. I have been keeping all programs closed and history and web site data cleared. Thanks for any help you can give.

Hi, dannilee,
I have exactly the same problem. The device was my favorite computer until 8.1.1. Now it runs s-l-o-w-l-y, requires endless reboots.
To improve the performamce, I have tried these:
1.Go to Setting->General->Accessibility->Reduce Motion. Turn on.
2.Reset iPad device settings using Setting->General->Reset->Reset All Settings. Its increase iPad performance little better.
3.Hold the sleep/wake button and home button upto 8 seconds. This will turn off your iPad. Then turn on iPad. Wait few moments. Do the same thing twice to solve this issue.
Solution 3 worked for me. And, I always recommend you to backup your iPad first before any action to avoid any data loss.
Hope it is useful for you.

My tabs are seperated into groups. Once I accidentaly opened a site in a new window (not a new tab). After that, I accidentaly closed the Firefox window with all my grouped tabs. Now, I can't recover it. Are there any solutions?

I have my tabs seperated into several groups (for example, bank tabs, music tabs, social life tabs and so on). I do this with the help of the button in the top left corner. While I was surfing the internet, I accidentaly opened a site not in a new tab (as I usually do), but in a new window. The new window was without all the grouped tabs, which I had in the previous Firefox window. And then I accidentaly closed the Firefox window with all my grouped tabs. Now I can't recover it. Are there any solutions?

Hi,
We have rolled out a fix for this issue.
Please log off and log back in to your machine and the issue should be resolved automatically. In case that does not work, please manually run the msi installer posted here (may require reboot).
For details, please refer to the KB article here: Multiple RunOnce keys created 11.0.10 and 10.1.13 Acrobat | Reader
Please let us know if you still face any issues.
Thanks,
Ashu Mittal

HT1222 Are there any security updates for the Mac OS 10.4.11?

Are there any security updates for my G4 PowerPC OS 10.4.11?

No. Tiger is an obsolete and unsupported OS at this point. If there were any updates you would find them using Software Update.

Are there any way to get my iphone back ?

My iphone 4S ios 7 was stolen today and it's offline in find my iphone, are there any chance i can get it back

Not a very good chance.
Report it to the police and your carrier, and change your passwords.

IOS v7 - Safari - Are there any page Scroll Gestures?

just wondering, are there any gestures for page scrolling in ios 7 safari? scrolling long pages is a real drag and just thinking i'm missing something.
ideas?

Hey Rickma85,
Wow! That definitely sounds weird. Have you attempted to quit the Safari application and restart your iPad? If not, I’d definitely do so:
Force an app to close in iOS - Apple Support
http://support.apple.com/en-us/ht5137
Restart or reset your iPhone, iPad, or iPod touch - Apple Support
http://support.apple.com/en-us/HT201559
If the issue persists, the next step would be to back up your device and restore it as new - then test once more (before restoring your backup):
Use iTunes to restore your iOS device to factory settings - Apple Support
http://support.apple.com/en-us/HT201252
Thanks,
Matt M.

Is there a way to download movies onto the iPad? If so, are there any particular sites that I should use?

Is there a way to download movies onto the iPad? If so, are there any particular sites that I should use?

You can only download content from the apple itunes and app stores.

I'm buying a new computer for use with Creative Cloud. Are there any advantages to PC vs Mac?

I'm replacing a seven year old Dell that still works but is getting rather long in the tooth. I have CS4 web design. (For PC)
I have a Macbook Pro (so I'm familar with Mac OS)
I'm upgrading my computer to mainly use the Creative Cloud.
Are there any advantages (related to Creative Cloud) to buying a Mac or a PC?
I just don;t wan't to a Mac and then find that many features don;t work that are on the PC (or vice versa)
Or is one interface easier to use than another?
Thanks in advance for any help.

It usually boils down to personal preference.
The software is, to all intents and purposes, the same in either operating system. There are minor differences between them, usually related to the hardware or the operating system. But if you can use the software in Windows, you'll be able to use it on a Mac too.
It's a matter of which environment you prefer: Windows or Mac. I use both daily since the Cloud allows you to install on Windows and/or Mac.

Are there any advantages of using Secure Empty Trash over regular Empty Trash?

Are there any advantages of using Secure Empty Trash over regular Empty Trash?

If you are going to run around with sensitive files on your file system, you might be better off using a whole disk encryption so that every file is encrypted, any deleted file contains encrypted contents. As long a no one can access your files using your encrytpion keys, all your data is secure.
Also secure delete is not really going to do much on a Solid State Drive, and again whole disk encryption would be a better choice.
For a moderate amount of data, secure erase does not take too much time. But if you have a ton of file and/or a few really large files to erase, secure erase can take a long time to complete as it is doing multiple pass to write and overwrite the file's storage with patterns of data that make it extremely difficult to recover the original data. That takes time.
Finally, if you have been updating a document, previous editions may have been given over to free storage as new versions are written, such that when you decide to erase the file you may only be doing secure erase on the most recent copy.

Are there any guidelines on how to customize R/3 reports into BW

Hi Everyone,
I have quite a number of R/3 reports that is required to be converted into a BW report but I do not know what I am supposed to do.
Are there any guidelines on how to determine if a R/3 report should be created in BW? If it should be done in BW, how do I consider if it should be reported of a cube or an ODS?
I have been doing development for ard 3years and this is the first time I have to analyze and come up with a functional/design specs. Need help.
If there is any documents on the guidelines, please send it to [email protected]
Thanks.
Regards,
Shunhui.

Hi Shunhui
TABS -> here Venkat was refering to SAP education courses on BW on extraction,reporting etc.
I am not aware if there are any guidelines given by SAP.
I will try to help you build the approrach for this:-
1. You should collect functional specification of R/3 report. This will include the functionality of that report, logic & calculations involved, usage of report output by end users etc.
2. Collect technical specification- In this you create excel sheet with all fields in R/3 report with relevant details such as formulas used, calculations involved etc.
3.Map these technical specs with BW business content. Try to see if you can get Business content datasource which will be a fit for majority of your R/3 report fields.
4.Carry out gap analysis and end of this excerise determine how you are going to fill this gap - whether buy using Zinfoobject,routines,datasource enhancements etc.
5.Classify the reports as Aggregate or transactional level. If it is transactional level then you need to make use of ODS.This will determine your data model in BW.
6.Based on 5 steps mentioned above,create a design document with dataflow & data model details.
7. Get a Sign off on functional,technical specs & design document with proposed dataflow from users and implement it.
For templates of functional & technical specs , you can refer to blueprint section of Accelerated SAP.
Hope this helps
Regards
Pradip

Are there any other AU-hosting plug-ins like VE Pro?

Are there any plug-ins that allow you to host other plug-ins within them, similar to how VE-Pro, or Kontakt Kore do?
I want a way to be able to save a combination of layered instruments. (VE Pro is a bit costly, and Kore is discontinued)
Thanks.

not sure about docks, but those J5 create systems seem to be doing the exact same job as synergy software in terms of being able to share clipboard and files between multiple devices - synergy let's you conect peripherals such as keyboard/mouse between screens/computer over a network link. I have a windows laptop connected to a dock with extra screen and this shares peripherals with my ubuntu server (and 3rd screen ).
I'm not sure what advantage thedocks above have over that.

Are there any (dis)advantages in building a universe on fully normalized tables instead of building dimensional model/tables and then universe on top of them?

Similar Messages

Maybe you are looking for