From: Scott Marlowe <scott.marlowe@gmail.com>
To: Merlin Moncure <mmoncure@gmail.com>
Cc: Greg Smith <greg@2ndquadrant.com>
Cc: Krzysztof Kardas <krzychk2@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: PostgreSQL with Zabbix - problem of newbe
Date: Fri, 9 Apr 2010 10:44:59 -0600
Message-ID: <r2ydcc563d11004090944vdee233a7w4dbf3ea99217005c@mail.gmail.com> (raw)
In-Reply-To: <l2gb42b73151004090930r8942742fhe96e3c8fe4920916@mail.gmail.com>
References: <v2w4ff8a7a31004080223mec26e053n69a2b80f24328f37@mail.gmail.com>
<4BBF4FDD.3090008@2ndquadrant.com>
<l2gb42b73151004090930r8942742fhe96e3c8fe4920916@mail.gmail.com>
On Fri, Apr 9, 2010 at 10:30 AM, Merlin Moncure <mmoncure@gmail.com> wrote:
> On Fri, Apr 9, 2010 at 12:03 PM, Greg Smith <greg@2ndquadrant.com> wrote:
>> The main problem with this configuration is that work_mem is set to an
>> unsafe value--1.6GB. With potentially 400 connections and about 2GB of RAM
>> free after starting the server, work_mem='4MB' is as large as you can safely
>> set this.
>
> if you need more work_mem for this or that and also need to serve a
> lot of connections, you can always set it locally (1.6GB is still too
> high though -- maybe 64mb if you need to do a big sort or something
> like that).
>
> Another path to take is to install pgbouncer, which at 400 connections
> is worth considering -- but only if your client stack doesn't use
> certain features that require a private database session. zabbix will
> _probably_ work because it is db portable software (still should check
> however).
Also remember you can set it by user or by db, depending on your
needs. I had a server that had a reporting db and an app db. The app
db was set to 1 or 2 Meg work_mem, and the reporting db that had only
one or two threads ever run at once was set to 128Meg. Worked
perfectly for what we needed.
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To: pgsql-performance@postgresql.org
Cc: scott.marlowe@gmail.com, mmoncure@gmail.com, greg@2ndquadrant.com, krzychk2@gmail.com
Subject: Re: PostgreSQL with Zabbix - problem of newbe
In-Reply-To: <r2ydcc563d11004090944vdee233a7w4dbf3ea99217005c@mail.gmail.com>
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