2017-10-08 19:10 GMT+02:00 Pavel Stehule <pavel.steh...@gmail.com>: > > > 2017-10-08 19:04 GMT+02:00 Pavel Stehule <pavel.steh...@gmail.com>: > >> >> >> 2017-10-08 18:59 GMT+02:00 Andres Freund <and...@anarazel.de>: >> >>> On 2017-10-08 18:57:28 +0200, Pavel Stehule wrote: >>> > 2017-10-08 18:44 GMT+02:00 Andres Freund <and...@anarazel.de>: >>> > >>> > > Hi, >>> > > >>> > > On 2017-10-08 18:36:23 +0200, Pavel Stehule wrote: >>> > > > 2. Lot of used tables are pretty wide - 60, 120, .. columns >>> > > > >>> > > > Now, I am doing profiling, and I see so most time is related to >>> > > > >>> > > > ExecTypeFromTLInternal(List *targetList, bool hasoid, bool >>> skipjunk) >>> > > >>> > > Yea, that's known - I've complained about this a couple times. You >>> could >>> > > try whether the following master branch helps: >>> > > https://git.postgresql.org/gitweb/?p=users/andresfreund/ >>> > > postgres.git;a=shortlog;h=refs/heads/simple_statement_perf >>> > > >>> > > That's just micro-optimization though, not a more fundamental >>> > > solution. But for me it yields pretty nice speedups for cases with >>> long >>> > > tlists. >>> > > >>> > > >>> > it is just this patch >>> > >>> > HeapTuple tup; >>> > Form_pg_type typTup; >>> > >>> > + if (typid < FirstBootstrapObjectId) >>> > + break; >>> > + >>> > tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid)); >>> > if (!HeapTupleIsValid(tup)) >>> > elog(ERROR, "cache lookup failed for type %u", typid); >>> >>> No. >>> >> >> please, how I can clone your repo? >> >> >> I found it > >
With your branch the execution is about 15-20% faster - so overhead of exec init is more significant. Unfortunately Oracle is significantly faster for this pattern Regards Pavel
