Answer Posted / aditya sharma

There are two types of indexes:
1.Primary Index
2.Secondary Index.

While creating a table or in an existing standard table the
key fields are the default primary indexes.

If we require to fetch records from non key fields we need
to provide Secondary Indexes.i.e., we need to explicitly
make non key fields as indexes.
This can be done by clicking on Index and adding the fields
for secondary index.

For Some major standard table SAP has provided secondary
Indexes like
Eg: BSEG table. As BSEG is a cluster table data retreival
using non key fields like Customer/vendor/GL account data
makes the response slower.So SAP has provided standard indexes.
Secondary index tables:
For Customer BSID and BSAD.
For Vendor BSIK and BSAK
For Material BSIM
For GL AccountBSIS

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