RE: EVI (encoded vector index) question

["Wilt, Charles" <WiltC@xxxxxxxxxx>]

Michael,

As always, the answer is it depends....

How many EVIs and what's the data like in the columns with the EVIs.

I've used EVIs, before but always just created them once.

Technically, IBM recommends dropping all indexes/logical files before a large data load.

You may just want to run a test.

Do the load without the EVIs.
See how long it tales to create them.

Do the load again with the EVIs already existing.


HTH,
Charles



> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
> bounces@xxxxxxxxxxxx] On Behalf Of Michael_Schutte@xxxxxxxxxxxx
> Sent: Friday, January 11, 2008 4:44 PM
> To: midrange-l@xxxxxxxxxxxx
> Subject: EVI (encoded vector index) question
>
>
> Anybody experienced in creating EVIs (encoded vector index)?  I'm reading
> the IBM help site but I have a couple of questions.
>
> http://publib.boulder.ibm.com/infocenter/iseries/v5r4/index.jsp?topic=/rza
> jq/whatareevi.htm
>
> I have a new table that's going to have records added to it monthly.
>
> The IBM site says to create EVIs on Read-only tables or tables with
> minimum
> of INSERT, UPDATE, DELETE activity.
>
> Once a month activity (at night) I wouldn't think would be an excessive
> amount of activity.   What do you think?
>
> If you agree with me, the site also states When Loading Data...
> 1. Drop EVIs, load data, create EVIs.
>
>
> Is that true?  It sounds like to me that before the monthly updating...
> I'll need to drop the EVIs, then add my new records... then recreate the
> EVIs.
>
> That kinda sounds right, but also it doesn't.  It sounds right so that the
> information can be regathered. but then again, shouldn't that happen on
> it's own?
>
> If I have to drop the EVIs and recreate then I'm not going to be able to
> do
> this.  All though this table is only going to add new monthly records
> every
> month, it's going to contain a lot of records.  I'm not sure if we can
> afford to have the recreation to run every month.
>
> Any help will be appreciated.
>
> Michael Schutte
> Admin Professional
> Bob Evans Farms, Inc.
> "The Secret's the Sauce! Enjoy our new Bob-B-Q Pulled Pork Knife & Fork
> Sandwich!"
>
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