Re: Slow performance with 9.3-110x JDBC 4

I wanted to avoid that recommendation, but since it is out there.
protocolVersion reverts to the same protocol as 8.4 uses which does not use
server side prepared statements

And I would expect it to speed up, or at least be the same as 8.4.7

Dave

www.credativ.ca

On Thu, Mar 27, 2014 at 1:45 PM, Edson Richter <edsonrichter(at)hotmail(dot)com>wrote:

> Em 27/03/2014 13:58, Lachezar Dobrev escreveu:
>
> You might want to do the same tests after adding ?protocolVersion=2
> to the connection URL.
> i.e.:
> jdbc:postgresql://localhost/database?protocolVersion=2
>
> 2014-03-27 15:35 GMT+02:00 ChatPristi <cchristo_0899(at)yahoo(dot)fr> <cchristo_0899(at)yahoo(dot)fr>:
>
> Dear All,
>
> I have a java program that does bulk insertions (with transactions and
> PreparedStatements) in a postgresql database. I have a performance divided
> between two and four when using 9.3-1100 JDBC4 and 9.3-1101 in comparison
> with postgresql-8.4-703 JDBC4 independently of postgresql version.
>
> Time(ms) PG 8.4.7 9.3.4
> Driver
> 8.4-703 193390 188379
> 9.3.1101 349404 344344
>
> Does anybody else saw such a difference ? What reasons can explain it ?
>
> Another point, is that the bulk insertions are prerformed by parallel
> processes and 9.3-110x JDBC4 drivers appear to scale poorly.
>
> Thanks for any help.
>
> What to expect from "protocolVersoin=2"?
> Speed up or down?
>
> Edson
>
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>
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