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Storage Modes in SSAS 2008R2 (MOLAP, ROLAP, HOLAP and InMemory)

  • May 29, 2013 at 11:54 pm

    #146062

    Can anyone throw some light on Storage Modes in SSAS 2008R2 (MOLAP, ROLAP, HOLAP and InMemory).

    I overall aware about the concept of Storage Modes but need to know from the experiance which one is better.

    Thanks

    Saurabh

  • May 30, 2013 at 10:09 am

    #1619777

    Default Storage mode is MOLAP.In this, data gets pulled from Relational DB and pushed to Analysis services after aggregations are created.It fetches only leaf level attributes. Super fast but consumes more memory and its not real time. But using proactive caching MOLAP can be made realtime.

    ROLAP is slow but real time and data and aggregations(stored in indexed views) are stored in relation databases.

    HOLAP: Aggregations are stored in Analysis services and leaf level data are stored in relational data. It is realtime and slow for leaf level data and fast for aggregations

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