Histogram updation and maintenance details

Hi,
I would like to know more about Histograms. In TOAD, when we see the table definition,
it shows a column called Histogram. In my understanding it gets updated when
the underlying table is Analyzed.
I'm interested to know few more things about it, please clarify them.
1) From which Metadata view, TOAD retrieves this information, it is not available in
USER_OBJECTS, USER_TABLES.
2) Does it get updated during any other event?
3) Does it contain any other information apart from Data Distribution details,
which will get referred while using Index in the underlying table, thank you.

1. Histograms info can be retrieved from DBA_TAB_COL_STATISTICS and DBA_TAB_HISTOGRAMS: http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/stats.htm#PFGRF30103
2. Histograms are updated when using DBMS_STATS especially when automatic DBMS_STATS job runs in 11g and 10g.
It can analyze query activity to decide if histograms should be generated: please read "Why Does My Plan Change?" in http://www.oracle.com/technetwork/issue-archive/2006/06-may/o36asktom-099107.html.

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Robert Pearman SBS MVP
itauthority.co.uk |
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Histogram updation and maintenance details

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