Answer / oraclem

Index is a DB object that makes data retrieval faster.Index created on column and that column is called index key.
Types of index:
1)BTREE Index
2)BITMAP index
Purpose of creating INDEX: Oracle will take more time to locate the record,to improve the performance of the quesry we have to create the Index.
IF we do not mention the type of index,by default oracle will take BTREE as default Index.

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