Tagged Questions

2
votes
0answers
87 views

Where and how to store my weird datamart

I could really use some help here. Here's my situation. I'm building a datamart in SQL Server 2005, which will furnish a single report (for now). We have 26 clients (medical organizations) that ...
0
votes
2answers
48 views

Can a surrogate key and a primary key be in the same table?

For example we have: Surrogate key: ABC123 Primary key: 1 Name: James Is this legit in a Data Warehouse table?
0
votes
0answers
28 views

How to handle “many columns” in OLAP RDBMS

I have a fact that has around 1K different numerical attributes (i.e. columns). I would like to store this in to a column-oriented DB and perform cube analysis on it. I tried to design a star ...
1
vote
1answer
84 views

Modeling staff dimension in data warehouse

I need to write a data warehouse diagram. I've got a problem with staff area. I have to store a information about workers details like name, age etc., and workers job time and agreement details like ...
3
votes
1answer
86 views

What to do with duplicate lookup information

I have multiple databases that I want to store in one data warehouse database. I am wondering how I design the import process to handle multiple lookup tables. For example, say I have 5 databases all ...
1
vote
1answer
79 views

Conceptual Design of a data warehouse (declaring the grain)

I am trying to design a data warehouse using this example scrubbed data. I need to declare the "grain". I know its the lowest level of detail in the fact table, but I am having a hard time determining ...
0
votes
1answer
121 views

What are good resources on data modelling for business intelligence? [closed]

We are a SaaS startup offering purchase & procurement solutions. The data model for operational transactions has been created (relational DB). We also want to offer analytics on those transactions ...
1
vote
2answers
142 views

XML Large DataBase is the best? [closed]

Is the best way to implement a large database is XML? Or is there a better way? 1 - reduce the time complexity 2 - Reduce the amount of traffic between the tables And other factors ... Which ...
5
votes
3answers
266 views

Partition pruning with multiple date columns

I have a large table in Oracle 11g database that holds historical data from several years, so I would like to partition it by year. The problem is that the table has multiple date columns and they are ...
0
votes
0answers
434 views

oracle database project ideas [closed]

I have to prepare three project ideas for my final year undergraduate project module. I like to work with databases and i want any challenging database design and implementation with various ...
4
votes
1answer
164 views

Should I Link a Fact to Hierarchical Dimension at ALL Levels or only the most granular?

Related question about the same project here. I'm looking at two approaches to model a hierarchical relationship between my fact and dimension tables in a data warehouse for storing IT infrastructure ...
0
votes
1answer
132 views

How to simplify schema for multi database / hundreds of millions of rows data set

We currently have a MySQL data set that was started about 10 years ago that aggregates a log of data, and accumulates millions of rows each month. The people that developed our system started ...
3
votes
1answer
66 views

Architectural Question about Data analytics

I understand that in many OLTP architectures there is some ELT stuff which creates a OLAP Data warehouse model and then you can run data analytics on this. However, this can take some time to ...
4
votes
1answer
228 views

Database structure, relational or data warehouse?

Good morning, Im having some issues with how my database should be laid out and would appreciate some guidance. I have several tables (rainfall data), each containing the following columns: Date ...
6
votes
2answers
248 views

What is the name of this schema pattern

Its been a few years... but I've run into a problem-set that reminds me of a schema design pattern and I'm trying to recall the details. Essentially, the pattern consists of one database which is 3 ...
4
votes
3answers
186 views

How do I add a time dimension to this forecasting database without having to duplicate every data point @ each reforecast?

I have a database designed to facilitate revenue forecasting. Revenue forecasting consists of tracking Orders which are recognized into Revenue at multiple points in time (each, a revenueDate). There ...
2
votes
1answer
172 views

Is dimensional modelling useful for modelling tables of calculations?

I have a set of tables that look a bit like this: Key 1 | Key 2 | Key 3 | Var 1 | Var 2 | Var 3 | ... | Var 200 ------------------------------------------------------------- X | Y | Z | ...
1
vote
2answers
98 views

Designing an Accumulating Snapshot with Repeated Groups, need advise

Situation I need to create a pie chart that has to be able to be represented at the following levels: District, Region, and School. At the student level it has to show the trend of the student over ...
1
vote
2answers
251 views

Indexing of Data Warehouse tables?

Maybe I have misunderstood something but I can recall reading an article which said that there is no reason to create non-clustered indexes on very large data warehousing tables? That is because ...
6
votes
2answers
1k views

Fact table foreign keys null?

I am new to data mart design and need to clear a few concepts. I have read up a bit on dimension modelling where I see that fact tables store foreign key references to dimension tables. Now suppose ...
8
votes
3answers
666 views

Suggestion for Large SQL Server Database Design

We are creating a database in MSSQL 2008 R2 Standard where we will be storing a large number of records. We estimate 200 million+ records in one table annually and we are primarily INSERTing with very ...
1
vote
1answer
538 views

Design of fact table(s) and dimensions tables for data warehouse

Hi i'm newbie in Datawarehousing, how would you model this in a Data Warehouse: i wish design the Data Warehouse which give the answers of statistics relating to a baseball league For players in ...
9
votes
4answers
553 views

Where should one put indexes in a time dimension table?

After reading the Questions and Answers from this website about indexes, a question came to my mind. What if, one is using a time dimension table with the lower level of granularity being the day. ...
18
votes
5answers
3k views

What are some ways to implement a many-to-many relationship in a data warehouse?

The dominant topologies of Data Warehouse modelling (Star, Snowflake) are designed with one-to-many relationships in mind. Query readability, performance, and structure degrades severely when faced ...