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SSAS INDEX


SSAS INDEX

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sanjeewan99
sanjeewan99
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Hello,

What is Index in SSAS Cube? Are these index degrade the cube processing ? How these index work in cube ?



Regards,

Sanjeewan


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Lempster
Lempster
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The equivalent of indexes in an OLAP Cube are Aggregations. Far from degrading performance, correctly-designed Aggregations can improve performance tremendously (be careful not to have too many though).
Chris Webb has an excellent blog post here on Aggregation Design and what you can do to enable the Design Wizard to produce better aggregations.
sneumersky
sneumersky
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There are also other internal bitmap indexes in the various file structures containing dimension data, but these are not indexes that you typically create declaratively with DDL like in an RDBMS. For example, the two level bitmap indexes in SSAS consist of a block index and a page level index.

These indexes are what gives SSAS such great read speed.

The physical internals of SSAS is a subject in and of itself.:-)
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