Hi Pooja,
It's general query in SAP world as well as on SCN,you could find lots of documents & SAP KBA's on SAP Indexing just by googling for the topic.
I can check previous same query from your end on the indexing has already been rejected by SCN Moderators.
So i suggest you to search it first on SCN/SMP. Apologies this time !!
Regards,
Gaurav