January 2012
Intermediate to advanced
542 pages
11h 28m
English
Content preview from Oracle Database 11gR2 Performance Tuning CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Reducing the number of requests to the database using materialized views
In this recipe, we will see how to increase the performance of the database—especially in a data warehousing environment—but the same recipe can be used with small changes in an OLTP environment as well by using materialized views.
Materialized views can be seen as snapshots of the data in one or more tables, on which a computation has been applied, for example, a join or a group. This summary data can be used to answer client queries readily, instead of reading all the data in the original table(s). An example is worth a thousand words. For example, we have a SALES table in SH schema, containing around 1 million rows, and we want a report of sales by product. We will see ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.