Hello I try to identify of our slow queries - we have lot of queries like
select count(*) from a,b where a.a = b.b; our servers has usually enough memory (we do OLAP) - we use some pooling for limiting memory expensive queries - and I found so hashjoin based queries are significantly slower than mergejoin queries. The profiler show me a most expensive function ExecScanHashBucket. When I decrease NTUP_PER_BUCKET from 10 to 3, then there was 2 times speedup of these queries. Can I expect some issue with using lower value in production? Regards Pavel Stehule -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers