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Message from discussion long running select min(timestamp) query
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joel garry  
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 More options Jan 28 2008, 7:17 pm
Newsgroups: comp.databases.oracle.server
From: joel garry <joel-ga...@home.com>
Date: Mon, 28 Jan 2008 16:17:52 -0800 (PST)
Local: Mon, Jan 28 2008 7:17 pm
Subject: Re: long running select min(timestamp) query
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On Jan 28, 7:40 am, "bobdu...@gmail.com" <bobdu...@gmail.com> wrote:

> Hi,

> I have a basic event table in my 10g database, primary integer key,
> and a nonnull timestamp "eventdate" field.  When executing the
> following command:

> select min(eventdate) from events;

> It can occasionally take a VERY long time.  There is a standard btree
> index on "eventdate", and roughly 20 other columns, a few of which
> also have basic btree indexes.

Well, I'm guessing that your 20 column index is just not the best one
for your min.  What happens if you make a btree index on just that
eventdate column?  It's been my experience that any table with more
than a few columns in an index isn't properly normalized.

There might be bug/patch issues, too.  timestamp is relatively new,
and you are using an unpatched base release.

How are you loading this table?  What is the exact definition of the
index?

jg
--
@home.com is bogus.
http://www.spacefem.com/hydrox/


 
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