Re: Parameters for PostgreSQL

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 1/08/2011 8:09 PM, Jayadevan M wrote:

The machine  configuration is
Opteron 2CPU * 4cores @ 2.3GHz
16GB RAM
OS Solaris10 x64

The most important spec has been omitted. What's the storage subsystem? For most database workloads that's *WAY* more important than the CPUs.

It certainly will be for yours, since your 100GB database won't fit into 16GB of RAM, so you'll be doing a lot of disk I/O.

Could you please let me know the parameters I should pay attention to?
Do the settings mentioned above look OK?

There's nothing obviously dangerous like a giant work_mem setting.

Like Oracle, it's very much a matter of tuning to your machine and workload. Parameters right for one workload will be less than ideal for another. If at all possible, do some load testing with a dev instance and tweak based on that.

The most recent book on Pg performance is Greg Smith's "PostgreSQL High Performance" and it's had very positive comments on this list. It might be worth a look.

We are suing weblogic.
         ^^^^^
Best. Typo. Ever.

I hear most people who use it want to, you're just brave enough to do it :-P

Should we let weblogic manage the connection pool
or try something else?

In Glassfish 3.1 and JBoss 7 I let the app server manage the connection pool. Assuming Weblogic works as well - which I'd hope - you should be fine doing the same.

PostgreSQL doesn't have any built-in pooling or admission control - each "connection" is also an executor backend and isn't especially cheap to have around, so you don't want hundreds and hundreds of them. If your app hangs on to connections from the pool for a long time, you might land up wanting to use an external thin pooler like pgpool-II. I wouldn't worry about anything like this unless you start getting max_connections exceeded exceptions via your pooler, though, as it shouldn't be an issue for most EE apps with a container-powered connection pool.

--
Craig Ringer

POST Newspapers
276 Onslow Rd, Shenton Park
Ph: 08 9381 3088     Fax: 08 9388 2258
ABN: 50 008 917 717
http://www.postnewspapers.com.au/

--
Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance


[Postgresql General]     [Postgresql PHP]     [PHP Users]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Yosemite]

  Powered by Linux