RE: OPS Sequences: nocache == order ??

One of our accelerator control system developers, an Oracle neophyte, claims to have achieved 13,000 tps writing to a RAID 5 array. I did set up the database, but most of the credit goes to him for exploring the OCI direct I/O options. I have no verified the rate, but I have no reason whatsoever to doubt him.

This is on older four processor sun box. We've now traded in the lone a-1000 ,attached two T3's, and turned on archive logging. I had him retest and he said it was quicker than before . It's still RAID 5. If you are wondering why RAID 5, we have another little 659.9 Terabyte database and thousands of machines in compute farms to process the associated data. That project has first choice, and the rest of us make do with what's left.

I too am curious where this theoretical limit of 16384 comes from. Theoretical as it no matter what hardware one chose this limit could not be surpassed?

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_SLAC.Stanford.edu

-----Original Message-----
Sent: Friday, September 06, 2002 4:38 PM To: Multiple recipients of list ORACLE-L

On Wednesday 04 September 2002 09:53, Tim Gorman wrote:
> Thinking more about it last night...
>
> Since Oracle's theoretical limit is 16384 commits per second, I imagine
> that you could safely make the sequence recycle at 9999 (or 16384 or 99999)
> and limit the number of digits contributed by the sequence to 4-5...
>

Really? What have they done in the past to get those astronomical TPS numbers on some of their bencmarks?

I'm pretty sure they were in excess of that number.

IIRC, they were done on an nCube using OPS and about 400 CPUs.

Jared

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