On Tue, Jan 22, 2013 at 3:46 PM, Andrew Dunstan
<andrew@dunslane.net> wrote:
The query is pretty simple and standard, the behaviour (and the plan) is totally different when it comes to a partitioned table.
Partioned table query => explain analyze SELECT "sb_logs".* FROM "sb_logs" WHERE (device_id = 901 AND date_taken = (SELECT MAX(date_taken) FROM sb_logs WHERE device_id = 901));
Ok, but I would have expected same plant repeated 4 times. When the table is not partitioned, the plan is defintely smarter: it knows that index is reversed and looks for max with an index scan backward). When the table is partitioned, it scan forward and I guess it will always do a full index scan.
--
rd
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