Hi Mladen,
thanks, I know what dynamic sampling is.
I had deep level questions on how it works internally.
You will find the questions below.
Thanks and Reagrds
Lothar
----Ursprüngliche Nachricht----
Von : gogala.mladen@xxxxxxxxx
Datum : 01/03/2020 - 02:12 (MN)
An : oracle-l@xxxxxxxxxxxxx
Betreff : Re: Searching MOS Note on dynamic sampling
Hi Lothar!
This is not a MOS note but Nigel Baylis's blog:
https://blogs.oracle.com/optimizer/dynamic-sampling-and-its-impact-on-the-optimizer
There is also an old Oracle Magazine Article by The Oracle Master (Tom for
short) Kyte:
https://blogs.oracle.com/oraclemagazine/on-dynamic-sampling
This is one of the very few articles by Tom Kyte that have survived his
retirement.
Regards
On 2/28/20 3:22 AM, Lothar Flatz wrote:
Hi Guys,
I colleague of mine told me that he read a MOS Note that was describing the
details of the way dynamic sampling is done.
The note was mentioning that only bitmap blocks are sampled and blocks less
than 25% full are considered empty.
In that same note also deferred segment creation is mentioned.
As my colleague is very experienced I believe is memory is correct.
However, we cannot find that note any more.
Can somebody point us to the doc?
Regards and thank
Lothar
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Mladen Gogala
Database Consultant
Tel: (347) 321-1217
