Re: Slow performance with 9.3-110x JDBC 4

For the record: I was recommending that for testing purposes only, to
check if the reduced performance is related to protocol version (I believe
there is a significant change it might).

2014-03-27 21:52 GMT+02:00 Dave Cramer <davecramer(at)gmail(dot)com>:

> 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
>>
>> --
>>
>> *Edson Carlos Ericksson Richter*
>>
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>> - Albert Einstein
>>
>
>