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With the development of decision systems and specially data warehouses, thevisibility of the data warehouse design before its creation has becomeessential, and that because of data warehouse importance as considered as theunique data source giving meaning to the decision. In a decision system theproper functioning of a data warehouse resides in the smooth running of themiddleware tools ETC step one hand, and the restitution step through the datamining, reporting solutions, dashboards... etc other. The large volume of datathat passes through these stages require an optimal design for a highlyefficient decision system, without disregarding the choice of technologies thatare introduced for the data warehouse implementation such as: databasemanagement system, the type of server operating systems, physical serverarchitecture (64-bit, for example) that can be a benefit performance of thissystem. The designer of the data warehouse should consider the effectiveness ofdata query, this depends on the selection of relevant indexes and theircombination with the materialized views, note that the index selection is aNPcomplete problem, because the number of indexes is exponential in the totalnumber of attributes in the database, So, it is necessary to provide, while thedata warehouse design, the suitable type of index for this data warehouse. Thispaper presents a comparative study between the index B-tree type and typeBitmap, their advantages and disadvantages, with a real experiment showing thatits index of type Bitmap more advantageous than the index B-tree type.

Les index pour les entrep\^ots de donn\'ees : comparaison entre index arbre-B et Bitmap