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Re: Underlying file structure Was: IBM i 7.2 & Power8



fixed

Not correct. You only have the issue if you create new indexes. That was
what John was talking about. If you create a field select logical using an
existing index there is no cost except the format object on the disk.
Underneath both use the same index sub-object and sequential I/O runs a lot
faster.


On Fri, Apr 25, 2014 at 2:58 PM, <rob@xxxxxxxxx> wrote:

The reason some people felt it was bad was probably because the more LF's
you had then the more overhead occurred.
Decades and decades ago John Sears used to have seminars on just this.
Then some "names" said it's no longer the impact it used to be. Especially
after version such-and-such.
Other people said that, in the real world, they still had multiple
examples of excessive LFs hurting performance.



Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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