[InterMine Dev] Unable to construct query - unable to get a connection to postgreSQL

Allan Kamau kamauallan at gmail.com
Sat Nov 3 12:32:45 GMT 2012

I did manage to restart Tomcat and PostgreSQL and now it seems I have just
a few connections to the DB.
However the "Unable to construct query" error is appearing when using the
"query builder" or when creating the "List Analysis". Both the tomcat and
PostgreSQL logs are not indicating any errors or warnings when the web page
having "Unable to construct query" error message is being generated.
I am using the "master" branch of the Intermine source obtained at about
0700hrs GMT today.
I have attached two screen shots showing the web resource showing this
error and the preceding web page.

On Tue, Oct 30, 2012 at 12:28 PM, Julie Sullivan <julie at flymine.org> wrote:

> Hi Allan
> Yes, InterMine correctly uses connection pooling. FlyMine only ever has
> about 8 connections open, 1000 is far too many and I would recommend
> changing that back to 50. (even with 6 people/mines on a single server this
> should be fine)
> Since you are testing, it's likely you are generating errors and thus
> incorrectly shutting down your builds and/or webapps - causing the
> connection to not be returned to the pool.
> I would restart postgres and see if it happens again. If so, let me know
> and you and I can debug your processes and try to figure out what's going
> on.
> Thanks
> Julie
> On 30/10/12 03:57, Allan Kamau wrote:
>> We are experiencing "Unable to construct query" error for some mines
>> that previously did not have such and error. The PostgreSQL logs
>> indicate that the number of connections to the database have been
>> depleted and that the remaining connection slots have been reserved to
>> the super user.
>> I increased the number of connections in postgresql.conf file to 1000.
>> We are 6 developers configuring several mines on a single server. Does
>> Intermine make use of connection pooling in order to potentially
>> reduce the number of connections to PostgreSQL?
>> Allan.
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>> dev mailing list
>> dev at intermine.org
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