Re: [HACKERS] Execution time.
Shiby Thomas <sthomas@cise.ufl.edu>
From: Shiby Thomas <sthomas@cise.ufl.edu>
To: "Vadim B. Mikheev" <vadim@sable.krasnoyarsk.su>
Cc: The Hermit Hacker <scrappy@hub.org>, pgsql-hackers@postgreSQL.org
Date: 1998-02-04T16:26:11Z
Lists: pgsql-hackers
=> > I invoked postmaster as: => > postmaster -B 30000 -o "-s -F -S 16384" => ^^^^^ => 240M of shared memory ?! => Is the size of the hash bucket dependent on the number of buffers available ? If so, with -B 30000, it might create huge hash buckets and hence the hash join could degenerate to a nested loops join. Is that possible -- just checking. What could be good values for -B and -S. The largest table I am joining is about 60M Thanks --shiby