Exactly.
Ian MacGregor
Stanford Linear Accelerator Center
ian_at_SLAC.Stanford.edu
-----Original Message-----
Sent: Tuesday, September 03, 2002 2:23 PM
To: Multiple recipients of list ORACLE-L
Thanks Ian, that was indeed the question, although the other
information is useful as well.
if I understand what you are saying correctly, it works but it won't
really buy me anything and I might do better controlling the space
myself. And while you have had no problems, you've heard negative
things about it. I can't afford to have this database not be available
so I'll manage them on my own
Rachel
- "MacGregor, Ian A." <ian_at_SLAC.Stanford.EDU> wrote:
> The question posed was not whether "extent management local" should
> be used, but whether automatic segment space management should be
> used.
>
> As this is a data warehouse, I would not expect you to have
> transactions trying to change the same block. Assuming you are
> loading; that is, inserting data and not doing updates, wouldn't you
> try to cram as much data as possible into a block? Seems this could
> be done more easily by controlling these parameters yourself
>
> I've got one system using automatic segment space management without
> any problems, however when I posed the same question on using it a
> few months ago, the respone which trickled in way highly negative
> concerning its usage.
>
> Ian MacGregor
> Stanford Linear Accelerator Center
> ian_at_slac.stanford.edu
>
> -----Original Message-----
> Sent: Tuesday, September 03, 2002 8:49 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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Author: MacGregor, Ian A.
INET: ian_at_SLAC.Stanford.EDU
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Received on Tue Sep 03 2002 - 20:18:21 CDT
