July 2006
Intermediate to advanced
560 pages
12h 57m
English
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Segments, Extents, and Data Blocks
Oracle preallocates segments of data blocks as the physical storage for data structures such as tables, indexes, etc. Oracle reserves groups of logically contiguous data blocks from a data file for a data structure as extents. A segment is the collection of all the extents dedicated to a data structure. Figure 8-7 demonstrates the relationship between a table and its data segment, extents, and data blocks.
When you create a new data structure such as a table, you can indicate the tablespace in which you want to create the corresponding segment. Oracle then allocates data blocks from one or more of the data files in use by the target tablespace.
Types of Segments in an Oracle Database
An Oracle database can contain ...
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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.