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 sequences
In this recipe, we continue to explore ways to reduce the number of requests made to the database, illustrating how the use of sequences can help us in achieving this as well as improved database scalability.
Sequences are used to assign a sequential number—unique until the sequence is recreated or reinitialized. In many non-Oracle databases, there are tools that allow developers to automatically assign a sequential number to a field—often the primary key—the so-called autoinc fields (Microsoft® SQL Server® and IBM® DB2® can define a field IDENTITY, MySQL™ has the AUTO_INCREMENT attribute, and so on).
Oracle database doesn't have a specific IDENTITY field, to achieve the same result ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.