Re: very slow largeobject transfers through JDBC

On Fri, 31 Aug 2018 at 10:15, Mate Varga <m(at)matevarga(dot)net> wrote:

> I see -- we could try that, though we're mostly using an ORM (Hibernate)
> to do this. Thanks!
>
> On Fri, Aug 31, 2018 at 3:57 PM Dmitry Igrishin <dmitigr(at)gmail(dot)com> wrote:
>
>> пт, 31 авг. 2018 г. в 16:35, Mate Varga <m(at)matevarga(dot)net>:
>> >
>> > Hi,
>> >
>> > we're fetching binary data from pg_largeobject table. The data is not
>> very large, but we ended up storing it there. If I'm copying the data to a
>> file from the psql console, then it takes X time (e.g. a second), fetching
>> it through the JDBC driver takes at least 10x more. We don't see this
>> difference between JDBC and 'native' performance for anything except
>> largeobjects (and bytea columns, for the record).
>> >
>> > Does anyone have any advice about whether this can be tuned or what the
>> cause is?
>> I don't know what a reason of that, but I think it's reasonable and
>> quite simple to call lo_import()/lo_export() via JNI.
>>
>
Can't imagine that's any faster. The driver simply implements the protocol

Do you have any code to share ? Any other information ?

Is the JDBC connection significantly further away network wise ?

Dave Cramer

davec(at)postgresintl(dot)com
www.postgresintl.com