Re: [PERFORM] Slow query in JDBC - Mailing list pgsql-performance

From Julien Rouhaud
Subject Re: [PERFORM] Slow query in JDBC
Date
Msg-id CAOBaU_bDpYP-G0uA4Rbdv6DgToEGgkMvufftxxzAJWWcxoCKfg@mail.gmail.com
Whole thread Raw
In response to [PERFORM] Slow query in JDBC  (Subramaniam C <subramaniam31784@gmail.com>)
Responses Re: [PERFORM] Slow query in JDBC
List pgsql-performance
On Thu, Sep 28, 2017 at 10:19 AM, Subramaniam C
<subramaniam31784@gmail.com> wrote:
> Hi
>
> When I try to execute the query from sql command line then that query is
> taking only around 1 sec. But when I execute the query using JDBC(Java)
> using preparedStatement then the same query is taking around 10 secs.
>
> Can you please let us know the reason and how to fix this issue?


I think jdbc always uses cursor, which can be problematic with default
configuration, because postgres will try to generate plans that
returns fast the first rows but not all the rows .  Can you try to
configure cursor_tuple_fraction to 1 and see if that fixes your issue?


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