What to grant to user to use index of table while querying?

I want 开发者_如何学JAVAto know if oracle uses index when user queries data from table and that user has been granted just:

grant select on table to user

I want to know if it is needed some another grant to use index.

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No, there is no requirement (or ability) to grant access to an index. If the user can access the table then their queries can use any available index.