Beginning Oracle Database 11g Administration From Novice to Professional

CHAPTER 17 SQL TUNING 409
achieve a dramatic reduction in the number of consistent get operations; in fact we will
only need one consistent get operation.
First, we create a hash cluster and then we combine the data from and
into another table called . In the interests of brevity, we
select only those items of information required by our query; items of information that
would help other queries would normally have been considered for inclusion:
Next, we create a materialized view of the data. We use materialized view logs to
ensure that any future changes to the data in or are immediately
made to the copy of the data in the materialized view. We enable query rewrite to ensure
that our query is automatically modified and that the required data is retrieved from the
materialized view instead of from and . Appropriate indexes that
would improve the usability and maintainability of the materialized view should also be
created; I leave this as an exercise for you.