Re: *****SPAM***** RE: Manipulate DATE histograms

  • From: Wolfgang Breitling <breitliw@xxxxxxxxxxxxx>
  • To: "Milen Kulev" <makulev@xxxxxxx>
  • Date: Thu, 14 Dec 2006 14:30:29 -0700

You're right. avgclen should be 7. As I said I just took the example from my paper. I changed the density (so some fictitious value) but forgot to change avgclen. The flags value I think I took from dbms_stats.set_column_stats calls created by export. I suppose you could just let it default. The flag(s) correspond to GLOBAL_STATS and USER_STATS of dba_tab_columns and thus can take on the values 0, 1, 2, and 3. (binary 00, 01, 10, 11).

At 02:11 PM 12/14/2006, Milen Kulev wrote:
Hi Wolfgang,
Thank you very much for your reply/Christmas present ;)
I have noticed that you are always using (..., 2,2) for the last two paramemers of DBMS_STATS.SET_COLUMN_STATS
(avgclen and flags  )

Shouldn't in this case avgclen  to be set to 7 (for DATE type) ?
avgclen should play a role somewhere in the CBO calculations, I think ...

And can  "flags" get any other value other than 2 (asking just of curiosity) ?

Best Regards. Milen


Wolfgang Breitling
Centrex Consulting Corporation

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