Re: Can PostGreSQL handle 100 user database? - Mailing list pgsql-general

Another thing to rember about PostgreSQL is DB Size vs CPU bits
 
8.1 CPU types - 32-bit or 64-bit
Performance of 32-bit cpu machines will decline rapidly when the database size exceeds 5 GigaByte. You can run 30 gig database on 32-bit cpu but the performance will be degraded. Machines with 32-bit cpu imposes a limitation of 2 GB on RAM, 2 GB on file system sizes and other limitations on the operating system. Use the special filesystems for linux made by SGI, IBM or HP or ext3-fs to support file-sizes greater than 2 GB on 32-bit linux machines.
For extremely large databases, it is strongly advised to use 64-bit machines like Digital Alpha cpu, Sun Ultra-sparc 64-bit cpu, Silicon graphics 64-bit cpu, Intel Merced IA-64 cpu, HPUX 64bit machines or IBM 64-bit machines. Compile PostgreSQL under 64-bit cpu and it can support huge databases and large queries. Performance of PostgreSQL for queries on large tables and databases will be several times faster than PostgreSQL on 32-bit cpu machines. Advantage of 64-bit machines are that you get very large memory addressing space and the operating system can support very large file-systems, provide better performance with large databases, support much larger memory (RAM), have more capabilities etc..

found at http://www.linuxdoc.org/HOWTO/PostgreSQL-HOWTO-8.html


At 02:50 PM 11/30/00 +0000, martin.chantler@convergys.com wrote:

I plan to convert a Foxpro system to client/server - hopefully using PostGreSQL
(about 100 tables / 300 mb / 100 users)

Firstly I heard a rumour that p-sql doesn't process queries in parellel, i.e.
performs them sequentially.
Is this true? If so it would surely make it impracticle when more than a few
clients are connected
I tried this out by running 2 VB programs via ODBC than randomly performed
queries - they appeared to work
in parallel - however I then started a PSQL session and entered a slow query it
appeared to stop the 2 VB programs until
it had completed. Anyone got the answer to this???

The other question I have is how much memory I should really have to support 100
connected clients. There must be a formula / rule of thumb for this?

I am hoping I can convince my customer to use postgresql but first I need to
convince myself it is up to the job :)
I am actually pretty impressed with it so far, its got a lot of functionality
that DB2 doesn't have

Thanks,

M Chantler
Southampton



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