On Mon, Feb 4, 2013 at 08:33:02AM -0600, Merlin Moncure wrote: > On Sat, Feb 2, 2013 at 11:36 AM, Carlo Stonebanks > <[email protected]> wrote: > > Here is an advantage Plpgsql has: > > http://www.postgresql.org/docs/9.1/static/plpgsql-expressions.html > > > > I guess you can offset this by creating your own prepared statements in C. > > Otherwise, I can’t think of how C could be slower. I would choose C for > > functions that don’t have SQL statements in them – e.g. math and string > > processing. > > For cases involving data processing (SPI calls), C can be slower > because pl/pgsql has a lot of optimizations in it that can be very > easy to miss. I don't suggest writing backend C functions at all > unless you are trying to interface with a C library to access > functionality currently not exposed in SQL.
How is PL/pgSQL faster than C? I thought we had optimized PL/pgSQL to save parsed functions, but I don't see how that would help with queries, which use SPI. Am I missing something? -- Bruce Momjian <[email protected]> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-general mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
