felix-accts-pgsql@crowfix.com writes:
> EXPLAIN ANALYZE doesn't show the slow timing
> because it requires values, not $n placeholders,
To analyze the plan used for a parameterized query, try
PREPARE foo(...) AS SELECT ... $n ...
EXPLAIN ANALYZE EXECUTE foo(...)
But I already know what you're going to find: the planner's estimates
for the range query are not going to be very good when it has no idea
what the range bounds are. This is a situation where it may be best
to absorb the hit of re-planning each time instead of using a generic
parameterized plan.
regards, tom lane