December 2011
Intermediate to advanced
269 pages
7h 26m
English
book
Expert Indexing in Oracle Database 11g: Maximum Performance for Your Database
by Darl Kuhn, Sam R. Alapati, Bill Padfield
Content preview from Expert Indexing in Oracle Database 11g: Maximum Performance for Your DatabaseBecome 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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Adding an Overflow Segment
For index-organized tables, it is common, and even recommended, to create an overflow area for row data as part of the overall index-organized table structure. The typical index-organized table that includes an overflow area is structured as follows:
- B-tree index entry, which includes the following:
- Primary key columns
- Some non-key columns depending on
PCTTHRESHOLDandINCLUDINGclause values specified - Physical
ROWIDpointer to overflow segment
- Overflow segment, which contains the remaining non-key column values
In a normal B-tree index, the leaf node contains the index column key value, and then the ROWID for the row in the data segment. With index-organized tables, all the non-key column values are stored within ...
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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.