Hey, we'll try to test this with pure JDBC versus hibernate. Thanks!
On Mon, Sep 3, 2018 at 11:48 AM Dave Cramer <p...@fastcrypt.com> wrote: > > > On Mon, 3 Sep 2018 at 03:55, Mate Varga <m...@matevarga.net> wrote: > >> Basically there's a class with a byte[] field, the class is mapped to >> table T and the byte field is annotated with @Lob so it goes to the >> pg_largeobject table. >> > > Ah, so hibernate is in the mix. I wonder if that is causing some > challenges ? > > >> The DB is on separate host but relatively close to the app, and I can >> reproduce the problem locally as well. One interesting bit is that turning >> of SSL between the app and PSQL speeds up things by at least 50%. >> >> Ah, one addition -- the binary objects are encrypted, so their entropy is >> very high. >> >> Any chance you could write a simple non-hibernate test code to time the > code ? > > Dave Cramer > > dave.cra...@crunchydata.ca > www.crunchydata.ca > > > >> Mate >> >> On Sun, Sep 2, 2018 at 12:55 AM Dave Cramer <p...@fastcrypt.com> wrote: >> >>> >>> >>> >>> On Fri, 31 Aug 2018 at 10:15, Mate Varga <m...@matevarga.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 <dmit...@gmail.com> >>>> wrote: >>>> >>>>> пт, 31 авг. 2018 г. в 16:35, Mate Varga <m...@matevarga.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 >>> >>> da...@postgresintl.com >>> www.postgresintl.com >>> >>
