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Oracle Data Warehouse Tuning for 10g
book

Oracle Data Warehouse Tuning for 10g

by Gavin JT Powell
April 2011
Intermediate to advanced content levelIntermediate to advanced
504 pages
16h 49m
English
Digital Press
Content preview from Oracle Data Warehouse Tuning for 10g
49
3
Effective Data Warehouse Indexing
This chapter is divided into three distinct parts. The first part examines the
basics of indexing, including different types of available indexes. The sec-
ond part of this chapter attempts to prove the usefulness, or otherwise, of
bitmap indexes, bitmap join indexes, star queries, and star transformations.
Lastly, this chapter briefly examines the use of index organized tables
(IOTs) and clusters in data warehouses.
3.1 The Basics of Indexing
An index in a database is essentially a copy of a small physical chunk of a
table. That index is then used to access the table, because reading the index
reads a small portion ...
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Publisher Resources

ISBN: 9781555583354