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How can Oracle Materialized Views be used to speed up data
warehouse queries?
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Answer / sabeena
A materialized view is a database object that contains the
results of a query. They are local copies of data located
remotely, or are used to create summary tables based on
aggregations of a table's data. Materialized views, which
store data based on remote tables are also, know as
snapshots.
A materialized view can query tables, views, and other
materialized views. Collectively these are called master
tables (a replication term) or detail tables (a data
warehouse term).
For data warehousing purposes, the materialized views
commonly created are aggregate views, single-table
aggregate views, and join views.
| Is This Answer Correct ? | 7 Yes | 0 No |
Answer / mallika
In data warehouses, you can use materialized views to
precompute and store aggregated data such as the sum of
sales.
Materialized views are often referred to as summaries,
because they store summarized data. They can also be used
to precompute joins with or without aggregations.
A materialized view eliminates the overhead associated with
expensive joins and aggregations for a large or important
class of queries
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / svs rajesh
In oracle materialized view carry the carry with them so it
is easy 7 faster to retrieve the data for reporting instead
of goin to the actual database these provide the faster
retrieval of data.
| Is This Answer Correct ? | 6 Yes | 3 No |
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