Re: Slow performance with 9.3-110x JDBC 4

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>:
>> 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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