×
INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Multiple data warehouse

Multiple data warehouse

Multiple data warehouse

(OP)
Hello,
After a merge, we have several huge data warehouses coming from absorbed companies.
Is there a way to have a seamless access to all those data warehouse without a new data integration into a new entreprise data warehouse ?

I heard about MDX or SOA, would that be a solution.

Thanks

RE: Multiple data warehouse

What do you mean by seamless access?  If you/they/whoever set up these other data warehouses to be accessible from your network, then I suppose your access would be seamless.  If you're talking about viewing multiple data warehouses as one data warehouse, then I wouldn't want it to be seamless.  There's no doubt that unless these are vendor-provided canned data warehouses that are black boxes, then business rules, measure definitions, dimensions and pretty much everything else will be different.   

RE: Multiple data warehouse

Sorry. You need to develop a series of conformed dimensions and facts. Consider the "lowest common denominator" approach.  Determine which dimensions and attributes exist across all companies.  Develop a strategy to conform, convert, or translate the different values to a standard set of values.  Do the same for your facts. This will be your conformed, integrated data warehouse.  Instead of using actual storage, you can attempt to duplicate the conforming activities using views, but the performance burden may be too much.  

-------------------------
The trouble with doing something right the first time is that nobody appreciates how difficult it was - Steven Wright

RE: Multiple data warehouse

(OP)
Thanks

By seamless, I meant as if it were a single data warehouse.
For instance if i have an MDX client, multidimensionnal cubes hosted in MS SQL Server or SAS , you would be able to access these cubes, am i right ?

RE: Multiple data warehouse

MDX is just a language to interact with the multidimensional databases.  So, if your front end tool supports all the different data warehouses, the best you can hope for is using the same tool to connect to different databases.  To combine them together, you really need to integrate them.

RE: Multiple data warehouse

One of the basic tenets of DW is to trade disk space and off-hours processing for ease of use and query response time. In this case, it's worth investing in the disk space to create redundant, but standardized, data at the lowest common fact and attribute level which can be shared across all the different, but similar data stores.  

-------------------------
The trouble with doing something right the first time is that nobody appreciates how difficult it was - Steven Wright

RE: Multiple data warehouse

At the very least you have to investigate, as johnherman pointed out, what the conformed dimensions are. How can you report across those DWH's.
After that you can use reporting tools like Cognos or Business Objects to gather data from several DWH's into 1 report.
I seriously doubt wether you will be able to answer all queries this way. For those queries you can consider setting up a databaseconnection between teh DWH's and define several views to use with reporting.

BUT i would urge you to see this as a temporary solution and to head for real integration. Get all information into 1 DWH as it makes maintainability so much easier.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close