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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
130 5.4 Dimension Objects and Performance
Unfortunately in Figure 5.14 it is shown that the optimizer does not
need an Oracle Dimension object to figure out the obvious. Now let’s create
the appropriate dimension against the materialized view join:
DROP DIMENSION dm_time;
CREATE DIMENSION dm_time
LEVEL month IS (time.month#)
LEVEL quarter IS (time.quarter#)
LEVEL year IS (time.year#)
HIERARCHY time_rollup(month CHILD OF quarter CHILD OF year)
ATTRIBUTE month DETERMINES(time.monabbrev, time.monthname);
Note: The ALTER DIMENSION statement could have been used here.
By connecting the TIME dimension between year, quarter, and month,
as shown in the above CREA ...
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Publisher Resources

ISBN: 9781555583354