Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> Tom Lane wrote:
>> This has to be coming from exec_simple_query():
> I wonder if some statistics were turned on at postmaster start and even
> though it was turned off and 'pg_ctl reload' was done the
> checkpoint/bgwriter process isn't reloading for some reason.
The checkpoint/bgwriter never executes exec_simple_query(). I think
the 5-minute cycle is driven by something in Robert's application,
rather than being tied to checkpoints.
regards, tom lane