RE: OPS Sequences: nocache == order ??

As I said I didn't verify his figures nor confirm he understands what constitutes a transaction. I'll endeavor to do so. The system collects data from monitors measuring the "health" of various test accelerator equipment. The telemetry is buffered before being inserted so that multiple readings could be pushed to the database as a single transaction which buoys Anjo's thought that 13,000 rows per second are being inserted not 13,000 tps.

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_SLAC.STANFORD.edu

-----Original Message-----
Sent: Saturday, September 07, 2002 1:13 AM To: Multiple recipients of list ORACLE-L

1. I think that the tpc numbers are done represented in Transactons Per Minute (TPM/C) and not Per second. So event with 500000 tpm/c it means around 8000 tps.
2. Inserting 13000 rows with direct I/O doesn't mean you did 13000 transactions. It could be one transaction
3. I have seen the theoretical limit, but if I recall correctly it was the number of SCN numbers that was generated. That way they can calculate how long it takes before the SCN number will wrap (it is only 48 bits). That is way in the future.

Anjo.

On Saturday 07 September 2002 04:08, you wrote:
> 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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