Comments on: Trace Files

By: Vlad’s Weblog

Vlad’s Weblog — Tue, 09 Oct 2007 05:06:23 +0000

[...] about. In few words there was confusion, doubt and something else, or so it seemed. The title was Trace Files. And here you go an inspiration came, and as usual from a direction you’d never [...]

By: Jonathan Lewis

Jonathan Lewis — Wed, 05 Sep 2007 06:20:08 +0000

Ted,
Note Title: “STATISTIC “cache hit ratio”. Last Revision Date: 12-Feb-2004.

I’m not surprised you’re confused ;-) Here’s one to think about for 10g: the “better formula for 8i/9i” quoted in the note includes the component:
( physical reads - (physical reads direct + physical reads direct (lob)) )

But in my 10.2.0.3, “physical reads direct (lob)” are included in “physical reads direct” – so the “better” formula for one version is (even more) wrong for another.

By: Ted

Ted — Wed, 05 Sep 2007 03:15:46 +0000

I’m confused about this one…. Note:33883.1 :)

By: Alvaro

Alvaro — Tue, 04 Sep 2007 23:27:52 +0000

Hi Jonathan,

I think Oracle is doing right doing this remarks in the context of an SR (TAR). For me this means that the SR reviewers/workers deserve “full authority”, as there are internals in the RDBMS that will only be known by them (obviously). So, they have full knowledge and assume full responsability for resolution of the problem (ie: they are getting paid for solve the SR!). All in all I don’t think this statements are meant to discourage customer investigation on the traces. Some SR reviewers appears to fully accept interpretation from the customer.

regards.