B-tree vs Bitmap index

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B-tree vs bitmap index
=================

  In this post i would like talk about index that to mainly b-tree vs bit man index.
  Both are used to play key role in performance of query.

lets some comparison of both:-

B-tree:-
  • it is one Default index, Like create index on one or columns using tree like structure.
  • Cardinality is High, means less duplicate
  • don`t confuse some people call it function based index as in.

syntax example:-
CREATE INDEX <index_name>
ON <table_name>(function(column_name));

 Bitmap:-
  • Carnality is Low, means more duplicate.
  • bitmap index create name with bimap
  • key word, Bitmap only can use in oracle Enterprise edition, standard edition we can not use this feature.


syntax example:- CREATE BITMAP INDEX 
<index_name>
ON <table_name> (column_name);
still we can add on more points, but i want to hear from your side also.
so please post your opinion about index types in comment session. 

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