Oracle DB Optimization Interview Question:

Do you have any idea what are indexes?

Submitted by: Administrator

Index can be thought as index of the book that is used for fast retrieval of information.
Index uses one or more column index keys and pointers to the record to locate record.
Index is used to speed up query performance.
Both exist as B-tree structure.
Kind of the indexes are clustered and non-clustered.

Index is the way to order the records in a database according to the field values. It is the way to have fast access to the particular information. Indexes are created to the columns that are queried frequently.
Submitted by: Administrator