Re: Too many SET TimeZone and Application_name queries

On 10/13/19 10:24 PM, Amarendra Konda wrote:
> Hi Adrian,
>
> Thanks a lot for the response.
>
> We are using JDBC Driver 42.2.8 along with the Tomcat Server on Java 8.
> As part of application code, We are *_not_* setting timezone (or)
> application names. One observation was, application was querying columns
> of the datatype "timestamp without time zone" .

Well something is explicitly setting the TimeZone. Per this:

https://stackoverflow.com/questions/18447995/postgresql-9-2-jdbc-driver-uses-client-time-zone

I would start with the JDBC driver. You might also try the Postgres JDBC
list:

https://www.postgresql.org/list/pgsql-jdbc/

Re: application_name. I do not see SET for this when I connect using
application_name as part of connection string:

psql "host=localhost dbname=postgres user=postgres
application_name=psql_client"

[unknown]-[unknown]-2019-10-14 07:06:35.508 PDT-0LOG: connection
received: host=::1 port=46246
[unknown]-postgres-2019-10-14 07:06:35.530 PDT-0LOG: connection
authorized: user=postgres database=postgres SSL enabled
(protocol=TLSv1.2, cipher=ECDHE-RSA-AES256-GCM-SHA384, bits=256,
compression=off)

So I believe this is being explicitly SET by something. Since
'PostgreSQL JDBC Driver' is the Postgres JDBC driver name I would start
there.

>
> Regards, Amarendra
>
>
> On Fri, Oct 11, 2019 at 7:33 PM Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com
> <mailto:adrian(dot)klaver(at)aklaver(dot)com>> wrote:
>
> On 10/11/19 4:49 AM, Amarendra Konda wrote:
> > Hi,
> >
> > In our test environment, it was observed that there are too many
> queries
> > were getting fired to the database server, even though they are
> not part
> > of the SQL query execution.
> >
> > And the number of queries that were coming to server are very
> high. Can
> > you please suggest on how to avoid these queries to the database
> server ?
>
> My guess is your application server/framework is setting the below.
> What are you using for above?
>
> >
> >
> > 2019-10-10 13:37:25 UTC:172.31.77.194(36920):
> > user1(at)new_unity_green1:[2549]:LOG:  duration: 0.081 ms
>  statement: *SET
> > application_name='PostgreSQL JDBC Driver';*
> > 2019-10-10 13:37:25 UTC:172.31.69.112(45682):
> > user1(at)new_unity_green0:[3545]:LOG:  duration: 0.036 ms
>  statement: *SET
> > TimeZone='UTC';*
> > 2019-10-10 13:37:25
> > UTC:172.31.77.194(36902):user1(at)new_unity_green1:[2112]:LOG:
>  duration:
> > 0.177 ms  statement: *SET TimeZone='Etc/UTC';SET
> > application_name='PostgreSQL JDBC Driver';*
> >
> >
> > *_Environment_*
> >
> >   * PGBouncer 1.9
> >   * JDBC Driver 42.2.8
> >   * Java 1.8
> >   * PostgreSQL 9.6.2 on x86_64-pc-linux-gnu, compiled by gcc
> (GCC) 4.8.3
> >     20140911 (Red Hat 4.8.3-9), 64-bit
> >
> >
> > Application Server, pgBouncer and database server are all configured
> > with UTC only.
> >
> > =>show timezone;
> >   TimeZone
> > ----------
> >   UTC
> >
> > Thanks in advance,
> >
> > Regards, Amarendra
> >
> >
> >
> >
> >
> >
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com