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2
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1answer
23 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 ...
1
vote
1answer
39 views

Having Non-Numeric values as measures in Fact table

According to my research regarding having non-numeric value as measures, I found that having non-numeric won't be an optimal one. So I planned to maintain numeric values. My scenario was "Employee's ...
0
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0answers
29 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 ...
0
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0answers
53 views

Is there value in storing audit fields in a fact table?

I've always stored at least two basic housekeeping fields in all of my dimension and fact tables: DateCreated and DateModified. However, this adds two fairly wide (eight bytes each, in MS SQL) ...
1
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0answers
166 views

What is the difference between bridge table and helper table in data warehouse's context?

From what I could understand :- Bridge tables are used when a dimension table can not be directly associated with a fact table. e.g. In a bank's data warehouse a fact table of balance of a customer ...
1
vote
0answers
59 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
103 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 ...
1
vote
3answers
70 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, ...
7
votes
2answers
1k 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 ...
0
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0answers
80 views

Should I use conventional or computed columns for trivial metrics in a fact table?

A fact table can often have measures which are basically trivial. For example Orders.NumOrders will probably be "1" for every real record (synthetic records representing "no order" may populate this ...
1
vote
0answers
131 views

What type of fact table / loading solution for a reservation system?

I am designing a Data Warehouse with SQL Server 2012 and SSIS. The source system handles hotel reservations. The reservations are split between two tables, header and header line item. The ...
0
votes
1answer
253 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 ...
7
votes
3answers
691 views

Header and line item data source mismatch

I'm working with a star schema for a data warehouse and I am running into a problem with header and line items from different data sources. CREATE TABLE DataSourceAHeader ( OrderId INT NOT NULL ...
1
vote
1answer
467 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 ...
4
votes
2answers
586 views

Open source and commercial tools to build dynamic queries of fact tables in star schema [closed]

What user interfaces or tools (commercial and/or open source) can query a star schema model (Ralph Kimball dimensional model)? So for example, if we have X fact tables, and Y dimension tables, and Z ...
1
vote
2answers
720 views

Data warehouse support tickets

I'm starting to design a data warehouse for a company. The first questions we're trying to resolve are regarding their support ticketing system. My initial schema is as follows Now one of the ...
0
votes
1answer
71 views

How to design this kind of relations in a database

I have a conceptual problem and I would like to get your ideas on how I'll be able to do what I am aiming. My goal is to create a database with information of persons who work at a place depending on ...
1
vote
2answers
2k views

How to check if there is partitions in use in fact tables?

I'm going to take a first look of a large data warehouse with many fact tables. How can I easily check if there is partitions and partition functions in use in these fact tables?
2
votes
1answer
1k views

Does surrogate key assignment for a fact table require that the source data has natural keys?

Let's say I have a simple OLTP database with orders, products, and customers: And from it, I am building a data mart with an orders fact table, product dimension, customer dimension, and date ...
1
vote
3answers
902 views

Improve performance of a Fact Table

I have a Fact table CardTransactionFact Table Structure TABLE [dbo].[CardTransactionFact] [CardTransactionID] [int] IDENTITY(1,1) NOT NULL, [TransactionTerminalID] [int] NOT NULL, ...
3
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4answers
1k views

How do you roll up header-level values on a fact table with line-item granularity?

From what I've read, the recommended granularity for a fact table based on an order header / line item structure is at the line item level. In the process, any additive values that apply only to the ...
1
vote
1answer
4k views

SSAS -> New cube contains two fact tables. How do I relate these so I can use measures from both at the same time?

I am working on a new cube. I know that you cannot directly create a relationship between two fact tables (and expect good results). I am just wondering how to go about doing this I have read ...
1
vote
1answer
1k 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 ...
1
vote
0answers
719 views

An advice to design a fact table with a scd as a dimension

I have a problem of conception and I would like to get your ideas on how I'll be able to do what I am aiming. My goal is to create a datawarehouse, with three dimensions and one fact table so far. ...