RE: EVI (encoded vector index) question

I'll give it shot on monday.

There are multiple keys on this file. Some of them I know will have a set
distinct value. Others could change. The iSeries index advisor suggested
created one on a column that could change as we add new units. That's how I
got interested in it.

Thanks for the suggestion. I can tell you right now.. without them, it
takes an hour.


Michael Schutte
Admin Professional
Bob Evans Farms, Inc.
"The Secret's the Sauce! Enjoy our new Bob-B-Q Pulled Pork Knife & Fork
Sandwich!"


midrange-l-bounces@xxxxxxxxxxxx wrote on 01/11/2008 05:10:52 PM:

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!"

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.

This e-mail transmission contains information that is intended to be
confidential and privileged. If you receive this e-mail and you are
not a named addressee you are hereby notified that you are not
authorized to read, print, retain, copy or disseminate this
communication without the consent of the sender and that doing so is
prohibited and may be unlawful. Please reply to the message
immediately by informing the sender that the message was
misdirected. After replying, please delete and otherwise erase it
and any attachments from your computer system. Your assistance in
correcting this error is appreciated.
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing

list

To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.