Hi Santhosh,
BI Accelerator is the new concept available in BI7.0 to accelerate the query performance by 10-100 times. BIA is new hardware component for which seperate server will be maintained. We can monitor the BIA Server with T-Code RSSBIAMON2. Here it will give the status of the server (Green if it is ok, yellow with warnings, Red with error).
BIA Inedexes can be created for cubes only. To craete BIA Indexes for cube Goto RSA1 --> Infoprovider--> select the cube on which BIA Indexes to be created -->Context--> select "maintain BI accelerator Indexes" option --> It will ask do u really want to carete indexes for particular cube --> click on continue--> continue--> Job will run for some time in SM37 -->click on end of the maintenanec button once it is finished.
To drop the indexes on particular cube also follow above procedure.
We can check the status of BIA on which available from Table RSDDTREXDIR. In this table it will show each cube two times with active and off status. For all the cubes this order shuld be active and off.
Please go through below links which are really useful...
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/8095212a-abaf-2a10-e0aa-8d9ff9515dc9
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/3604c604-0901-0010-f0aa-b37378495537
http://help.sap.com/saphelp_nw04s/helpdata/en/43/bcf9bfdd052ec5e10000000a11466f/frameset.htm
I hope it helps u..
Regards,
Ramki.