December 2006
Intermediate to advanced
228 pages
6h 20m
English
book
Introduction to the New Mainframe: Large-Scale Commercial Computing
by Mike Ebbers, Pilar Gonzalez Adrados, Frank Byrne, Rodney Martin, Jon Veilleux
Content preview from Introduction to the New Mainframe: Large-Scale Commercial Computing
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120 Introduction to the New Mainframe: Large-Scale Commercial Computing
6.10 Random access to data
The RAID design provides a much greater capability for processing data than the
previous generation of DASD. However, the first request to read a data record
requires the component parts to be retrieved from the internal disks, and this is a
relatively long operation. After the first reference is complete, the data will be in
cache and therefore subject to high-speed retrieval. The problem with this,
however, can be illustrated with an example from the banking industry.
The key piece of information relating to a client account is the account number,
and a large bank will potentially have millions of these numbers. An increasing
number of clients ...
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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.