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41 views

SSAS MD dimension joins to same table twice (but processing fails as attribute has 2 names for same ID)

My cube has a product dimension, and each product has an "availability" status attribute. In the database, SellableItemAvailabilityId in DimSellableItemVersion (which contains products) joins to Id in ...
3
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2answers
78 views

Cube with 2 measure groups (with different relationships to dimensions) returns too many dimension members in reports

I have a cube that contains stock-take data from retail operations. It has 2 measure groups - one containing the number of stock units counted in each stock-take batch (which is related to the ...
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2answers
56 views

Ordering of a dimension in sql server datawarehouse

Built and deployed a simple cube with a date dimension. The dimension has things like day of month. How do i sort it? it always shows in the reports as 1, 10, 11, 12, ... 19, 2, 20, 21 Design. ...
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1answer
27 views

What if the lowest granularity level can legitimately be null?

I have a normalized database that I'm going to be using as a source for a dimensional data store; one of the facts I'm collecting is Orders, the normalized schema looks roughly like this: However ...
5
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1answer
57 views

Designing a dimensional DB off a normalized source that already implements SCD's

I have built an SSIS ETL to integrate various data sources (one from MySQL, two from SQL Server) into a single SQL Server relational and normalized database, which I've called [NDS]. The SSIS ETL ...
4
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1answer
69 views

How do I make a nullable “parent” hierarchy level?

I'm setting up my first dimensional database with SSAS, and I have this [Materials] dimension that needs a hierarchy that goes something like this: [PriceCode v] --> nullable Price Code ... ...
4
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1answer
494 views

How can I get the measures of the last month with MDX?

I would like to get the values of the measures of the previous month. That's what I have: SELECT [Measures].[Recuent distinct] ON ROWS, TAIL(NonEmptyCrossJoin([Dim Date].[Calendar].[Month ...
5
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0answers
26 views

What Database is optimized for 4d data layout? [closed]

I need to store 4d data points inside a virtual 3d world (position+date+data value). I have a lot of data layers > 250 (wind direction, sea temperature, terrain type, etc). Sources of my data layers ...
2
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2answers
142 views

When to choose an attribute vs. a new dimension?

I am fully aware of what is a fact, attribute and dimension. However, I'm quite confused to which traits I should choose for dimensions vs attributes of that dimension. For instance, I'm building a ...
2
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0answers
50 views

Column Store Indices versus Dimensional Tables

I have a Data Warehouse and want to think ahead one year when I may get a database update allowing me to use column store indices. My dimensional tables are mostly junk dimensions containing columns ...
2
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1answer
35 views

Duration measure in fact table

I have a fact table with the user reservations with StartDate and EndDate. I am thinking what is the proper way of serving the duration queries in the reports. Should I calculate DurationDays and ...
0
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1answer
29 views

Dimensional Model for inheritance in dimensions

How are dimensions typically modeled in a dimensional model if one dimension logically inherits from another dimension? For example, assume I have an Employee dimension and a Driver dimension, where ...
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0answers
71 views

ETL flow in Fact tables

I've got a simple theoretical question... If we discuss the principles, elements, design and implementation of a typical ETL flow for a dimension table then, in my understanding, (in short) I'd say ...
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1answer
725 views

Dimensional Modeling and ETL in Redshift

I have been researching Amazon's Redshift database as a possible future replacement for our data warehouse. My experience has always been in using dimensional modeling and Ralph Kimball's methods, so ...
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0answers
45 views

Oracle MODEL clause: Carry yesterday's leftovers to today

I'm new to the MODEL clause. I'm trying to track volume of worked/unworked to-do items over time. What I HAVE is: work_date born (# of new to-dos per date), robo (# of computer-closed to-dos ...
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0answers
114 views

Converting Entity Relation(ER) Model to Relational Schema?

I have the following ER Model I am trying to convert this to a relational database schema but I am not sure about several things: PORT_VISIT and PORT are weak entities. How do I figure on which ...
1
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0answers
79 views

how many fact tables do I need given I want to build an OLAP for Quotation Line Item and Purchase Order Line Item report?

My client wants a report that looks something like this on a daily basis. +---------------+-------------------------+-----------------+---------------------+-------------+ | ProductNumber | ...
0
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1answer
231 views

What to do when facts change frequently in a star schema for data warehouse?

I have a Quotation Management system that I built as a CRUD web app. Over time, I realized I need to improve it so that management can have their reports. Hence I studied the Kimball method of data ...
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3answers
122 views

Data Warehouse measures without a corresponding dimension

I have an operations database that contains this table: salesQuality salesPrice salesCategory According to my business requirements, the salesQality and salesPrice are measures. However, ...
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0answers
82 views

Which is the best way for selecting dimension attributes while creating a dimension?

I'm a newbie to SSAS OLAP so please apologize me if it was a silly question but surely I need suggestions. I would like to make clear some concepts which was confusing for me. Let us consider five ...
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1answer
97 views

Should I create a Factless Fact Table or Denormalise my table

I am creating a data warehouse from a store database and I have a question regarding the design of my dimensions and facts. In the store database a table exists for Person, Person_Address and ...
0
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1answer
28 views

Conformed Fields or Snowflake? - Shop and Customer Location

I have shop dimension and customer dimension which both has location information. Should I create location dimension to correlate shop location and customer location? I believe this one is called ...
1
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2answers
57 views

Dimension for Product Properties based on Product Type - Sparse Dimension?

I am creating dimension of product properties for sales facts. Property of product depend of product type. For example: - Type = smartphone. Properties = model, OS, size - Type = book. Properties = ...
8
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2answers
2k views

Is my understanding of Fact table granularity correct?

Myself and another DBA at our company are tasked with reviewing a database design that a vendor has developed for us. The vendor has said they use Kimball as the basis for their design. (NOTE: I am ...
2
votes
1answer
50 views

Modeling Conversion Events in a Data Warehouse

How should I model conversion events? For instance, if a sales opportunity goes from "stage: prospecting" to "stage: validating", should that be treated as a changing dimension, or a conversion event ...
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2answers
233 views

Business Logic in Data Warehouse

my question is: Should business logic be stored in the data warehouse data store? Or should it only exist in the reporting applications? To give a more concrete example: In the CRM operational ...
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2answers
223 views

Database design for tracking referral dollars and referred dollars

Dropbox has a great referral incentive program that gives a storage bonus based on whether a person is referred to Dropbox or refers others to Dropbox. What data base design is good for managing ...
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2answers
264 views

Dimension or Degenerate Dimension?

I am taking a course on data warehousing. Currently, I am reading through Ralph Kimball's Data Warehouse Toolkit. I understand that a degenerate dimension is a dimension key that is stored in a fact ...
0
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1answer
303 views

Constellation Schema; Relationships between fact tables

What are acceptable types of depedendcies between facts in a multiple-fact schema? Conceptually talking, As you know a Multi-Dimensional Model may have multiple facts (like in a constellation ...
2
votes
1answer
869 views

Dealing with measure groups of different granularity

Let's say I have a simple data warehouse with the following fact tables: FactPurchase: one row per property purchased, with purchase amount, value, etc. FactMonthlyStatus: one row per property, per ...
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2answers
598 views

To normalize or not to normalize for few distinct values

Assuming in a Postgres database, you have a table called party, which can have less than 5 well-defined party_types such as 'Person' or 'Organization'. Would you store the party_type in the party ...
2
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3answers
452 views

How to solve multidimensional data relationship

I'm having a problem, that I could solve programmatically, but for my personal (test) project I'm trying to see if I can fix it in the relational model. Imagine a complex fashion product Pants with ...
0
votes
0answers
181 views

Datamodel design for multiple roles, country access

I am in the process of creating a data model for the below scenario there will be two hierarchies a) dept hierarchy (emp -> team -> dept -> branch) b) sales hierarchy (emp -> marketing manager -> ...
0
votes
1answer
307 views

Type of Foreign Keys for a Dimensional Model Fact Table?

I've been reading about dimensional models, and in particular fact tables, but I haven't really seen one in action (i.e. the actual content), just diagrams of the table structures and column names ...
1
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1answer
734 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 ...
0
votes
1answer
178 views

BI development in Microsoft BI

I need to learn how to create a dimensional modelling for an organisation that do not has a BI tool and BI model. Where can I learn more about BI development that should be used in a company? IT's ...
7
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3answers
6k views

Datawarehouse Design: Combined Date Time dimension vs. Separate Day and Time dimensions and timezones

We are just starting design for a new data warehouse and we're trying to design how our date and time dimensions will work. We need to be able to support multiple timezones (probably at least GMT, ...