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 >> >
