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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
326
11.2
How the Optimizer Rewrites Queries
DROP MATERIALIZED VIEW mv_sales;
CREATE MATERIALIZED VIEW mv_sales
NOPARALLEL NOLOGGING TABLESPACE mvdata
COMPRESS USING NO INDEX NEVER REFRESH
ENABLE QUERY REWRITE
AS SELECT year#, quarter#, month#
,COUNT(transaction_amount)
, SUM(transaction_amount)
FROM sale s, location l, time t, product p, industry i
WHERE s.location_id = l.location_id
AND s.time_id = t.time_id
AND s.product_id = p.product_id
AND s.industry_id = i.industry_id
GROUP BY year#, quarter#, month#;
ANALYZE TABLE mv_sales COMPUTE STATISTICS;
Figure 11.3 shows an example query rewrite dimensional rollup opera-
tion where the query rolls up on the ...
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Publisher Resources

ISBN: 9781555583354