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Answer Posted / rad
An index is an oracle object that stores ROWID (pointer)
and columns(s) data on a source table. Two main types are
B-tree and Bitmap. An index is crucial as it can preempt
unnessessary full table scans on the source table if the
queried data is included the indexed column(s). B-tree
primarily useful in OLTP and Bitmap is DSS (generally..)
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