Re: Slow performance with 9.3-110x JDBC 4
От | Dave Cramer |
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Тема | Re: Slow performance with 9.3-110x JDBC 4 |
Дата | |
Msg-id | CADK3HH+qZUs7PeQpoig--hakhHBmAmLBAAMOR6dW2ApaceN6JA@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: Slow performance with 9.3-110x JDBC 4 (ChatPristi <cchristo_0899@yahoo.fr>) |
Список | pgsql-jdbc |
In order to get to the root cause of this I'd have to see exactly what you are doing ?
Can you share the relevant code ?
On Fri, Mar 28, 2014 at 6:25 AM, ChatPristi <cchristo_0899@yahoo.fr> wrote:
Thank you very much for your help and explanations.Indeed, the Lachezar's recommendation ( jdbc:postgresql://localhost/database?protocolVersion=2) restores the speed: 190413 ms with jdbc-9.3.1101 and postgresql 9.3.4.As I used bytea and due to change since postgresql 9.0 for handling them (bytea_output parameter), my programs only work with jdbc-9.3.1101 (and no longer with jdbc-8.4-703).So, I must use 9.3.1101. However, what does the sentence "I was recommending that for testing purposes only" by Lachezar means ? How to increase performance of server side prepared statements ?Le Vendredi 28 mars 2014 10h50, Lachezar Dobrev <l.dobrev@gmail.com> a écrit :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@gmail.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 statementsAnd I would expect it to speed up, or at least be the same as 8.4.7DaveOn Thu, Mar 27, 2014 at 1:45 PM, Edson Richter <edsonrichter@hotmail.com> wrote:Em 27/03/2014 13:58, Lachezar Dobrev escreveu:What to expect from "protocolVersoin=2"?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@yahoo.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.
Speed up or down?
Edson--
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