RE: SQL/400

[pytel@xxxxxxxxxx]

Building index from index is not the same as building index from table
data.
It normally involves doing preselection on underlying index.
If optimizer have chosen to build such index, it obviously decided that
this was the fastest way to get a result.
You cannot "pre-build" such index, so if you think this is a concern, try
to reformulate your query.

PS: as a second thought, you can try to build a view, if you can guess what
kind of preselection was done.
And then address your query to a view, not to original table.

    Alexei Pytel


Sandeep Potnis <potnis@india.com> on 03/07/2000 03:20:24 PM

Please respond to MIDRANGE-L@midrange.com

To:   MIDRANGE-L@midrange.com, "'MIDRANGE-L@midrange.com'"
      <MIDRANGE-L@midrange.com>
cc:
Subject:  RE: SQL/400




I already have an index on that field. The issue is that its creating an
index on index dynamically. How can I avoid that ? Or should I try to avoid
that?


Appreciate your response.

Sandeep

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Build a logical over the file keyed by the date field.

> -----Original Message-----
> From:   Sandeep Potnis [SMTP:potnis@india.com]
> Sent:   Tuesday, March 07, 2000 9:18 AM
> To:     MIDRANGE-L@midrange.com
> Subject:     SQL/400
>
> Hi,
>
> I have a table(TableA) with 38 million rows in it. One of the columns is
> DATE type and I have an index(XDTIndex) on that column.
>
> When I run an interactive query with date selection I get an
informational
> message saying 'Building access path from XDTIndex'
>
> Can I avoid this by creating this access path in advance ? If so how?
>
> Thanks
>
> Sandeep
>
> ______________________________________________
> FREE Personalized Email at Mail.com
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Title: RE: SQL/400

Build a logical over the file keyed by the date field.

-----Original Message-----
From:   Sandeep Potnis [SMTP:potnis@india.com]
Sent:   Tuesday, March 07, 2000 9:18 AM
To:     MIDRANGE-L@midrange.com
Subject:        SQL/400

Hi,

I have a table(TableA) with 38 million rows in it. One of the columns is
DATE type and I have an index(XDTIndex) on that column.

When I run an interactive query with date selection I get an informational
message saying 'Building access path from XDTIndex'

Can I avoid this by creating this access path in advance ? If so how?

Thanks

Sandeep

______________________________________________
FREE Personalized Email at Mail.com
Sign up at http://www.mail.com?sr=mc.mk.mcm.tag001

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