We may end up reworking the extent sizes, right now they are smaller
than those but we are still in stage one, haven't gone live yet (and I
don't even want to think about what a pain it will be to change things
when we do go live).
Data load test coming up soon, so I'll have a better idea of what I
need to change things to, if I need to change them.
There is no way the customer row will remain the same size unless I
change all the varchar fields to char. We have VERY sparse data as yet
and expect to be able to entice customers to "fill in the blanks" which
will cause rows to grow.
We are allocating WAY more space than we need at the moment and will be
closely monitoring growth (once a day data loads) and I can always turn
on autoextend if I need it. But then again, I am not the DBA who will
be responsible for the production site, at least not for any space
issues on the production DW.
Rachel
- DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM> wrote:
> Rachel - I have been using LMTs with uniform extents
> (Oracle-recommended
> variation) for a couple of years now with Oracle 8.1.6, and now 9.2.
> The
> Oracle-recommended extent sizes are 128k, 4m, and 128m. As far as
> PCTFREE,
> et. al., these are at the table level, so my opinion would be that
> the
> guidelines for these are unchanged from the pre-LMT days. The key
> issue with
> the highly updated customer table would be whether the size of the
> row is
> changing. If you can keep the row size constant, then you won't wind
> up with
> chained rows. The biggest issue facing you is whether you turn
> AUTOEXTEND
> on. I did that and have encountered relatively few problems. Well,
> one
> problem. I had tables set with large NEXT extents to minimize
> extents, and
> when one extended boy did my sys admin get excited. I changed that.
> A bigger issue in building your data warehouse is whether you can
> use the
> partitioning option. Most of our queries were taking more than 2
> minutes and
> I was able to partition and bring that down below 10 seconds. The
> users were
> pretty excited.
>
> Dennis Williams
> DBA
> Lifetouch, Inc.
> dwilliams_at_lifetouch.com
>
>
> -----Original Message-----
> Sent: Tuesday, September 03, 2002 10:49 AM
> To: Multiple recipients of list ORACLE-L
>
>
> time for me to ask the experts again.
>
> My data warehouse will be 9.2, with all locally managed tablespaces.
> We
> will be following what I have taken to calling the "Goldilocks"
> principle -- that of small, medium and large tablespace extent sizes,
> with variations in that we will separate indexes and data, and will
> have even more separation for our fact tables into partitioned tables
> and tablespaces.
>
> However, now comes the time for me to work out storage clauses. And a
> quick read through the docs leaves me wondering if I should just turn
> on automatic segment-space management and not worry about setting
> PCTFREE, PCTUSED and FREELIST parameters. I can't find any real
> information or bugs on MetaLink either.
>
> Does anyone have any experience, good OR bad, with using this
> feature?
> If you are doing data warehouse work, what are good values for the
> parameters if I DO use them? One fact table is likely to be highly
> updated (customer info) as we collect more and more specific
> information from customers. The rest will be, as you would expect
> from
> a DW, mostly inserts.
>
> Help?
>
> Thanks!
>
> Rachel
>
> __________________________________________________
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> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Rachel Carmichael
> INET: wisernet100_at_yahoo.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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> Author: DENNIS WILLIAMS
> INET: DWILLIAMS_at_LIFETOUCH.COM
>
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Do You Yahoo!?
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--
Author: Rachel Carmichael
INET: wisernet100_at_yahoo.com
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Received on Tue Sep 03 2002 - 13:44:16 CDT
