I got a little distracted by the bizarre actual-time values shown for some of the query steps:
-> Merge Join (cost=2451266.53..2655338.83 rows=13604393 width=8)
(actual time=82899.466..-2371037.726 rows=2091599 loops=1)
-> Sort (cost=2451169.10..2483246.47 rows=12830947 width=8)
(actual time=82891.076..-529619.213 rows=4187378 loops=1)
-> Hash IN Join (cost=507.32..439065.37 rows=12830947
width=8) (actual time=61.943..1874640.807 rows=4187378 loops=1)
The hash-join total time is obviously wrong seeing that the total
runtime is only about 100000 msec, and the negative values for the other
two are even more obviously wrong.
I recall that we saw similar symptoms once before, and I thought we'd fixed it, but I didn't find any relevant mentions in the CVS logs.
What version are you running, exactly? Could you repeat the EXPLAIN with client_min_messages set to 'debug2', and see if you see any messages about InstrStartTimer or InstrStopNode?
7.4.1, build from sourcecode. Running on MacOS X Server 10.3.2, dual G5 with 3.5 GB RAM
I have set client_min_messages in postgresql.conf to debug2 but i see nothing. Is this going to the normal logfile? Must i activate anything else?
regards David
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