Обсуждение: Re: [SQL] 2 million+ entries
Michael Richards wrote: > We're currently testing a system with about 1.2 million records with 6.5 > and it outperforms SQL server 6 by quite a lot. It's running on a dual P3 > with a 4 9.1 gig Cheetah array on a DPT controller running RAID0. I'm > pretty happy with it... > > Great balls of fire! A dual P3 with a four 9.1 Gig RAID0 Cheetah array? That's fantastic! How much did that set you back? Are there any special quirks about using Postgres on a multiple processor, multiple disk system? -Tony
> Michael Richards wrote: > > > We're currently testing a system with about 1.2 million records with 6.5 > > and it outperforms SQL server 6 by quite a lot. It's running on a dual P3 > > with a 4 9.1 gig Cheetah array on a DPT controller running RAID0. I'm > > pretty happy with it... > > > > > > Great balls of fire! A dual P3 with a four 9.1 Gig RAID0 Cheetah array? > That's fantastic! How much did that set you back? Are there any special > quirks about using Postgres on a multiple processor, multiple disk > system? No quirks. Our multi-Unix-process model for each backend makes multi-cpu's work great. In fact, multi-threading, which mysql uses to put multiple backends in a single unix process, can be a pain to get working on a multi-cpu system unless the OS can handle threads across multiple cpu processes. -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania19026
On Wed, 25 Aug 1999, G. Anthony Reina wrote: > > We're currently testing a system with about 1.2 million records with 6.5 > > and it outperforms SQL server 6 by quite a lot. It's running on a dual P3 > > with a 4 9.1 gig Cheetah array on a DPT controller running RAID0. I'm > > pretty happy with it... > > Great balls of fire! A dual P3 with a four 9.1 Gig RAID0 Cheetah array? > That's fantastic! How much did that set you back? Are there any special > quirks about using Postgres on a multiple processor, multiple disk > system? As I recall it was about $8k CAD. The system purrs. I'm especially happy with the DPT controller. This would be a truly worthy machine for a large news feed. -Michael
On Wed, 25 Aug 1999, G. Anthony Reina wrote: > That's fantastic! How much did that set you back? Are there any special > quirks about using Postgres on a multiple processor, multiple disk > system? Oops. To answer your second question. No. None whatsoever. The multi-disk array is handled by the RAID controller. To the OS it appears to be a gigantic disk. The RAID controller also has hardware cache so it can do nifty things like queue a large number of simultaneous requests and elevator sort them for seek efficiency. The machine also has a large amount of RAM. If you really need high performance, I've done nifty things like putting indexes on different disks. Postgres does not seem to have a problem with tables which have been physically moved and replace with symbolic links. I don't know how well it would handle DROP queries, but I'm not in the habit of dropping 10Gb tables very often. -Michael