Questions tagged [facttable]

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8
votes
2answers
4k 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 ...
7
votes
4answers
4k 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 ...
7
votes
3answers
1k 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 ...
5
votes
2answers
5k 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 ...
5
votes
1answer
51 views

If a DW fact table is not uniquely identified by all dimensions, what problems?

This is a bit of a thought problem I've been wrestling with. I have a visceral antipathy to the notion of duplicate combinations of dimension values in a fact table. I've read a lot about the ...
4
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2answers
1k 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 ...
4
votes
2answers
1k 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 ...
3
votes
1answer
140 views

Dimensional Modeling of a Loan Approval Process and Fact Grain(s)

Context: I'm modeling for a lending company and I'm modeling our loan approval process. I have some basic dimensions relative to our business figured out: Time(day) Account Opportunity ...
3
votes
1answer
2k 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 ...
3
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0answers
1k 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. ...
2
votes
3answers
2k 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, [...
2
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2answers
2k 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 ...
2
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1answer
2k 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 ...
2
votes
1answer
2k 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 ...
2
votes
1answer
158 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 ...
2
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0answers
176 views

Clustered index on a fact table

I'm trying to work out what field(s) to use for the clustered index of my fact tables (which all have a similar structure). I'll use FactSales as an example: CREATE TABLE dbo.FactSales ( ...
1
vote
1answer
8k 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
3answers
570 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, ...
1
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2answers
4k 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?
1
vote
3answers
400 views

Should a Fact table contain a column with a single unique value?

In order to simplify reporting, I am wondering if for each of the Fact tables we have, whether I can include a column that states the name of the Fact table, albeit in a more user friendly format e.g....
1
vote
1answer
2k 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 ...
1
vote
1answer
21 views

Advice on Measures that have properties on their own

I'm looking for advice on how to model a database when the measures have an increasing number of properties - the values of which could be considered dimensions in their own right. In a simplified ...
1
vote
2answers
304 views

Non numeric attributes in fact table (to track data source)?

I am creating a data warehouse using star schemas, following the Kimball methodology. One of the rules is only put numeric values in fact tables. I am considering putting an "id" in a fact table, in ...
1
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0answers
8 views

SSAS Design 2 Fact tables (1 Weekly, 1 Monthly) [closed]

I am currently busy building a sales cube for a customer. However they would also like to see their current stock count in the same cube. The Sales Fact table is on a daily grain, where as the Stock ...
1
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0answers
54 views

My Fact table has data weekly but it is not visible in SSAS cube

I have my fact table that has data in weekly basis, so I am mapping with Week dimension to pull records in Piviot table. My ssas cube doesnt show all data that is in fact. Should I add any specific ...
1
vote
0answers
368 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 ...
1
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0answers
632 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 | ...
1
vote
0answers
340 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 ...
0
votes
4answers
287 views

Database design to record occurences in tv show

I want to make a database where I record the guests of each episodes of a tv show. I want to be able to do the following stastics: What guest had the most appearences? Which two (or three) guests ...
0
votes
1answer
111 views

FK Issue with Fact Table

I have a Datawarehouse star schema. One Dim table is 'DimTweet'. This contains tweet details. For a selected date I want to be able to display the number of tweets. However, I have a problem in my ...
0
votes
1answer
691 views

Problem with Processing Dimensions with Multiple Facts

I have a cube built in SSAS that uses 3 facts and 8 dimensions. Some of the dimensions are shared across 3 facts. When I process one of the dimension, it tries to process the underlying measure ...
0
votes
1answer
42 views

SSAS Cube Only Displays Total Values

When browsing my cube it shows the correct invoice values by date when I select only a date type (the date table was generated by SSAS with hierarchies), but if I add the customer name it shows the ...
0
votes
1answer
579 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 ...
0
votes
1answer
76 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 ...
0
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0answers
40 views

Dimensional Model for CRM Sales Opportunity and Sales Leads: Fact or Dimension?

I'm working for a business lender, and trying to come up with a basic dimensional model around the subject area of loan approvals. We use a CRM, (Salesforce) and one of the core objects is a (Sales) ...
0
votes
1answer
525 views

Periodic snapshot fact table with monthly grain - Question on dimensions

I am fairly new to data-warehousing but have read my fair share of books and online tutorials to gain an introductory understanding of the basic components that build up a data warehouse. My end goal ...
0
votes
1answer
3k 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 ...