Fact vs Dimension Table

Which table is large terms of size, fact table or dimension table? Explain

Questions by raviws314

Showing Answers 1 - 18 of 18 Answers

A fact table captures the data that measures the organization's business operations. A fact table might contain business sales events such as cash register transactions or the contributions and expenditures of a nonprofit organization. Fact tables usually contain large numbers of rows, sometimes in the hundreds of millions of records when they contain one or more years of history for a large organization.

Dimension tables contain attributes that describe fact records in the fact table. Some of these attributes provide descriptive information; others are used to specify how fact table data should be summarized to provide useful information to the analyst.

Faizal

  • Aug 30th, 2011
 

Dimension Tables: These table are otherwise known as lookup tables which remain static with the business measures,dimensions, they do not change values when running ETL every time.

Fact Tables: This table captures data from the active transaction OLTP system and gets updated with rows each time you run a ETL.

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santhosh

  • May 28th, 2012
 

Dimension:It gives description about fact.

Fact:Is knows as Key Identifier(Measures)

EX:
Empno Empname Sal Deptno
1 A 20,000 201
2 B 15,000 203

All facts are numeric

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Fact tables: Have any measurable value in it and it contain foreign key of all the dimension table.

Dimension Tables: Do not have any numeric value, and it shows the characteristics that describe a transaction.

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