What structure can you implement for the database to speed up table reads?

Question :

What structure can you implement for the database to speed up table reads?

Follow the rules of DB tuning we have to: Properly use indexes ( different types of indexes) properly locate different DB objects across different tablespaces, files and so on create a special space (tablespace) to locate some of the data with special datatype ( for example CLOB, LOB and …)