Fwd: Hidden Columns

Sorry for wasting bandwidth - found the answer 5 minutes later (found it by looking up "histograms" in the manual, not "DBMS_STATS"):

For those who want to know - a hidden column is an expression for a function based index. Therefore you can use this option to gather stats when using function based indexes.

• Bill.

>Date: Wed, 28 May 2003 14:42:31 +0100
>To: ORACLE-L_at_fatcity.com
>From: Bill Buchan <wbuchan_at_uk.intasys.com>
>Subject: Hidden Columns
>
>
>Hi all,
>
>I know this is RTFM but I can't find the right part in the FM to R. So
>any help would be appreciated:
>
>In the context of:
>
> DBMS_STATS.GATHER_DATABASE_STATS(method_opt=>'FOR ALL HIDDEN COLUMNS');
>
>what is a "hidden column". I tried gathering stats FOR ALL HIDDEN COLUMNS
>and it didn't seem to gather any stats for any columns. What is it meant
>to do?
>
>Thanks
>- Bill.
>
>PS. The complete syntax for the column is: FOR ALL [INDEXED | HIDDEN]
>COLUMNS [size_clause]

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