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Message Posted: Thu, 08 Nov 2001 @ 18:16:33 GMT


     
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Subj:   Re: Statistics Report
 
From:   John Hall

The statistics are kept at a column level in table DBC.TVFIELDS, column FIELDSTATISTICS. If FIELDSTATISTICS is NULL, then statistics have not been collected for that column. So you might try a query like (I didn't get a chance to test the query first):

    SEL D.DATABASENAME  (NAMED DATABASE_NAME)
      , T.TVMNAME       (NAMED TABLE_NAME)
      , F.FIELDNAME     (NAMED COLUMN_NAME)

      FROM DBC.DBASE      D
         , DBC.TVM        T
         , DBC.TVFIELDS   F

      WHERE D.DATABASEID = F.DATABASEID
        AND T.TVMID      = F.TABLEID
        AND F.FIELDSTATISTICS IS NOT NULL

      ORDER BY 1,2,3;

The above query is for columns. For an index, then you need to do a similar query against DBC.INDEXES, column INDEXSTATISTICS (instead of DBC.TVFIELDS, column FIELDSTATISTICS).

For what it's worth: The date/time of when the statistics were collected are embedded in the FIELDSTATISTICS/INDEXSTATISTICS columns. You can substring those columns to extract the ASCII date/time values (sorry, I don't have my notes at hand and so I can't tell you the specific columns).

Does anybody know the specific fields that make-up FIELDSTATISTICS/INDEXSTATISTICS? Last time I heard, they weren't formally documented.



     
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