How accelerator works

Dear Sir,
Can u tell me How accelerator works mean how it increase the performance of query execution?
Thanks and Regards
Lalit Kumar

HI,
BI accelerator is a highly scalable analytic server that processes queries initiated by users of SAP NetWeaver BI. Its uniqueness and the features that make BI accelerator highly scalable is the use of
- SAPu2019s TREX search technology in conjunction
- with blade server architecture provided by its hardware partners.
This is how it works:
1) Data is loaded from source systems into an SAP InfoCube.
2) index is built for this InfoCube and stored inside the BI accelerator appliance.
3) These are search engine indexes built using SAPu2019s TREX search technology.They are stored in a file system (not a database system) using vertical decomposition (a column-based approach as opposed to the row-based approach that requires more read time). This results in highly compressed data sets that further contribute to fast processing speeds.
4) BI accelerator indexes are loaded into memory where the query is processed. In memory, joins and aggregations are done at run time. Loading of indexes into memory happens automatically at first query request, or it can be set for preloading whenever new data is loaded.
5) At run time, query requests are sent to the analytic engine, which reroutes the query to the BI accelerator.
Just to add more:
-> Currently the data source for BI accelerator can only be an SAP Info Cube. It does not work with other SAP data sources such as ODS.
- >Thereu2019s currently a one-to-one relationship between an instance of SAP NetWeaver BI and a BI accelerator. Sharing of multiple SAP NetWeaver BI instances with a single BI accelerator is not yet supported.
->Works only with BW 7.0

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