Answer / sivaramakrishna

when we want to get the details based on a field in select
statement we should use always primary key fields to
improve the performence. but in any case needed to get
detais based on non primary key fields then we go for
secondary index . ie based on which non primary key fields
we need to fetch the data using select st for those fields
we create secondary index in sell.

Answer / abaprajaram

For Perfomance perspective to use two keys to read the data
in to the internal tables

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