Answer / nivas

Primary index : these r created automatically when the table is created.
Secondary index :These r created manually by the ABAP developer or Admin.

Answer / nivedhan

Primary Indexex: These are the key fields in the table
Secondary Indexes: If the we are going to use some fields
other than key fields, we can create secondary indexes for
them.
But, Generally secondary indexes are not advisable to
use.

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