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From "Sundar Sankar" <fatboys...@gmail.com>
Subject Re: [SURVEY] How many connections are in your pool?
Date Tue, 20 Jan 2009 19:50:18 GMT
Hi Clinton,
                  I apologize ahead, if I am missing or not getting
something right. As far as my understanding goes, arent number of
connections in a pool in relation to the number of parallel users that
access the application than the number of CPU cores in a database?


On Tue, Jan 20, 2009 at 12:39 PM, Clinton Begin <clinton.begin@gmail.com>wrote:

> It sounds like you're still using a "pool", but your max, min, idle, and
> active connections are all equal (i.e. 16).  Otherwise, how do you allocate
> connections to the incoming requests?
> Cheers,
> Clinton
> On Tue, Jan 20, 2009 at 12:33 PM, Nicholoz Koka Kiknadze <
> kiknadze@gmail.com> wrote:
>> Ours is an application that requires guaranteed response times under 50
>> ms, so:
>> 1) We dropped using any kind of pool, so that
>> 2) number of constantly open connections equals to the number of
>> processors (16)
>> 3) I know you were asking about pool, but still I dared to respond with
>> this no-pool variant because I think maybe what you are asking can be
>> reformulated as: is there any use of DB pool in a short lived transaction
>> scenario, or its better to have one connection per CPU. Testing our app made
>> us to drop using pool with TimesTen (in memory) database. Now I started to
>> suspect that using using db pool (I've mostly used dbcp ) in other less
>> demanding projects (but again w/o long running transactions) was just saving
>> development time (let pool handle concurrency issues), but not any
>> substantial performance gain. Wonder what others think...
>> On Tue, Jan 20, 2009 at 8:43 AM, Clinton Begin <clinton.begin@gmail.com>wrote:
>>> Hi all,
>>> I've been studying a few large enterprise applications and have noticed
>>> an interesting trend... many of these apps have HUNDREDS of connections
>>> (like 600) available or even open in their connection pools...
>>> Survey Questions:
>>>   1. How many connections do you have available in your pool?
>>>   2. And if you know, how many CPU cores are available on your database
>>> server (or cluster)?
>>>   3. If you have 2x or 3x more connections than you do CPUs, do you have
>>> a reason that you could share?
>>> Cheers,
>>> Clinton

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