INTERVIEW QUESTIONS CONCEPTS AND ARCHITECTURE OLAP DETAILS

Question: Explain about Encoding technique used in bitmaps indexes?

Answer: Bitmaps commonly use one bitmap for every single distinct value. Number of bitmaps used can be reduced by opting for a different type of encoding. Space can be optimized but when a query is generated bitmaps have to be accessed.

Bitmaps commonly use one bitmap for every single distinct value. Number of bitmaps used can be reduced by opting for a different type of encoding. Space can be optimized but when a query is generated bitmaps have to be accessed. Source: CoolInterview.com

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