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  3. June 2015

Re: Looking for file structure details

Jon, thank you for sharing this! I'd been off the Power i radar for
several years prior to January, and I'd not heard this. I used debug a few
months ago to get index advice and wondered why it didn't seem to give good
results. (At the time, the admins had not opened the ports for System
Navigator, so I was stuck with debug.) Very good information.

- Dan

On Sat, Jun 27, 2015 at 9:31 AM, Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:

According to the information I’ve been given in recent years by IBM’s
database experts such as Mike Cain, Kent Milligan and others it is becoming
increasingly risky to base decisions on creating new indexes etc. on the
debug information. It is many, many years since the debug information has
been updated and consequently the decisions being made by the optimizer are
not adequately reflected.

As Vern says, Visual Explain is the best and in practice should probably
be the only tool you use.

Jon Paris


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