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Performance Tunning

HI IAM Priiya .

plese tell me the difference bw AGGREGATES and COMPRESSION in SAP-BI

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4 Answers

  • Posted on Nov 20, 2011 at 10:57 AM

    Hi,

    Please check out this thread for the same.

    Hope it helps.

    Regards,

    AL

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  • author's profile photo Former Member
    Former Member
    Posted on Nov 21, 2011 at 04:32 AM

    HI.

    aggregates we are creating based up on characteristics and compression based up on fact table suppose if u do a compression eliminating of zero records....

    and refer these link

    Regards

    Rajasekhar

    Edited by: R.S REDDY on Nov 21, 2011 5:32 AM

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  • author's profile photo Former Member
    Former Member
    Posted on Dec 08, 2011 at 08:35 AM

    Hi Priya,

    Both aggregates and compression can be used to improve the performance of reports.

    Aggregates An aggregate is a materialized, summarized view of the data in an InfoCube. In other words, it consolidates and stores a subset of InfoCube data into a database. This subset of data is redundant and persistent. When we execute a query on an InfoCube with appropriate aggregates, the query reads the summarized data directly from the database thus eliminating the need to perform any processing related to summarization during query runtime.

    Aggregates help access Infocube data quickly during reporting. Aggregates creation is highly recommended when:

    - Query execution and navigation requires speeding up.

    - Navigational attributes are required to be used in the queries.

    Please check the below link for details

    http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/20caa882-d8f1-2e10-598c-96d22ddea9eb?QuickLink=index&overridelayout=true

    Compression:

    Each Data Load done in an info-cube is uniquely identified with a request ID associated with them. The Concept of deleting these meaningful load identifiers in info-cubes is called as Compression.SAP compression reduces the number of rows in the F fact table (sometimes to zero). This is because when requests are compressed data moves from F - Fact Table to E- Fact Table.

    Please check the below link for details

    http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/c035d300-b477-2d10-0c92-f858f7f1b575?QuickLink=index&overridelayout=true

    Thanks,

    Vinod

    Edited by: Vinod Sivadas on Dec 8, 2011 9:35 AM

    Edited by: Vinod Sivadas on Dec 8, 2011 9:36 AM

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  • Posted on Dec 08, 2011 at 09:16 AM

    Hi

    Both Aggregates and compression works for Infocube .

    Aggregates : Aggregate is similar to Infocube but it will maintain more summarized data when compared to infocube . We can able to load the data from infocube to the aggregate via ROLLUP. this rollup should be performed before compression because rollup is done based on the request id and compression refers to the loading the data from the F FACT TABLE to the E FACT TABLE and whenever we perform compression the requestid will be deleted from the infocube . So , after compression we can't able to rollup because the request id is set to ZERO after compression.

    Hope u got it,

    Assign points,

    Thanx & Regards,

    RaviChandra

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