We too have a data warehouse close to 500GB in size.
We upgraded the OS solaris 2.8 and our block size is
16K. All our data and index tablespaces datafiles are
spread across 20 files systems whose disks are on EMC
storage. We too user veritas volume manager. File
systems use four 9 GB disks whaich are raid S and
software stripe uinit size of 256 KB.
reasons
16K block size as we have many full table scan ans
sequential reads.
256 KB stripe unit size because we have set the
db_file_multi_block_read_count to 64(1MB)
we are moving to a sun fire 15K machine soon and then
the we will go to 9i 64 bit.
- "Toepke, Kevin M" <ktoepke_at_trilegiant.com> wrote:
> Cherie:
>
> If you are using Oracle 9i, you can use mutliple
> block sizes! You still
> create your database with a default block size, but
> each tablespace (except
> system) can have a block size different from the
> default.
>
> Valid blocksizes are limited by OS, but they range
> from 2K to 32k.
>
> Check out the 9i docs for CREATE TABLESPACE for more
> info.
>
> Caver
>
> -----Original Message-----
> Sent: Thursday, April 25, 2002 11:24 AM
> To: Multiple recipients of list ORACLE-L
>
>
>
> We are building a new version 9.0.1 data warehouse
> on Sun Solaris 2.6
> migrating to Solaris 2.8. We will be using striped
> disk that is striped
> using Veritas Volume Manager on EMC disk.
>
> The datawarehouse will be about 200 Gig. It will
> be written to throughout
> the day.
>
> To this point, almost all of our databases have been
> created with an 8k
> block size. i'm not sure if that blocksize is
> optimal anymore. With 9i,
> what block sizes are people using in the field
> nowadays for data
> warehouses?
>
> Also, if you use striped disk, what stripe size are
> you using and why?
>
> Thanks for weighing in on this topic.
>
> Cherie Machler
> Oracle DBA
> Gelco Information Network
>
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Received on Thu Apr 25 2002 - 14:39:29 CDT
