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Sakthidasan why we use index
By default primary keys, forgeign keys, custom fields marked as External Ids/Unique along with the system dates (like last modified) are indexed.but you we need index?it it useful for reterive large record,Please explain
1) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_SOQL_VLSQ.htm
2) Improve performance with Custom indexes using Selective SOQL Queries
https://help.salesforce.com/HTViewSolution?id=000006007&language=en_US
3) Know Thy Salesforce Field Indexes for Fast Reports, List Views, and SOQL
https://developer.salesforce.com/blogs/engineering/2015/06/know-thy-salesforce-field-indexes-fast-reports-list-views-soql.html
NOTE:- Indexes in a database are like the index in a book–they help you find what you are looking for fast. When you’re designing filters for a report, list view, or SOQL query, you can confirm that your filter condition fields have indexes by checking the field lists on an object’s detail page. Notice that the Indexed column clearly indicates whether a field has an index
Let us know if this will help you
Thanks
Amit Chaudhary