Answer Posted / pinkey

Bitmap indexes are widely used in data warehousing
environments. The environments typically have large amounts
of data and ad hoc queries, but a low level of concurrent
DML transactions. For such applications, bitmap indexing
provides:

Reduced response time for large classes of ad hoc queries
Reduced storage requirements compared to other indexing
techniques
Dramatic performance gains even on hardware with a
relatively small number of CPUs or a small amount of memory
Efficient maintenance during parallel DML and loads

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