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Catalog table SYSSTATSFEEDBACK


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beikircherw

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Joined: 18 May 2020
Posts: 7
Location: Italy

PostPosted: Tue May 19, 2020 12:20 pm
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Hi guys,

I just stumbled across the catalog table SYSSTATSFEEDBACK. According to IBM it should save some recommendation for the RUNSTATS utility. So I searched the IBM knowledge center and only found this entry
https://www.ibm.com/support/knowledgecenter/SSEPEK_11.0.0/cattab/src/tpc/db2z_sysibmsysstatfeedbacktable.html

But my problem is to understand what to do with all that information. For example: REASON = DEFAULT. The description says
Quote:
A predicate references a value that is probably a default value.

So what? What kind of RUNSTATS do I have to run in order to support the optimizer with more helpful statistics?

Is there some kind of redbook that discusses the topic of SYSSTATSFEEDBACK?
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Nic Clouston

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Joined: 10 May 2007
Posts: 2455
Location: Hampshire, UK

PostPosted: Tue May 19, 2020 2:15 pm
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Plenty of information if you Google SYSSTATSFEEDBACK
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beikircherw

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Joined: 18 May 2020
Posts: 7
Location: Italy

PostPosted: Tue May 19, 2020 3:13 pm
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Thanks for the feedback.

As You can imagine, I googled before creating this topic. ;)
The 118 results that Google gives answer not the question of how to interpret the data in SYSSTATSFEEDBACK.

And I don't want do buy a new product that does the word for me...
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