Just looking at the 2 B_2 queries, I'm curious as to why is the execution plan different between the 2 machines. Is the optimiser stats updated on both databases?
Regards,
Wei Shan
On 1 April 2015 at 22:32, Aidan Van Dyk <aidan@xxxxxxxxxxx> wrote:
On Wed, Apr 1, 2015 at 9:56 AM, Pietro Pugni <pietro.pugni@xxxxxxxxx> wrote:Now let’s propose some query profiling times.
B type set are transactions, so it's impossible for me to post
EXPLAIN ANALYZEresults. I've extracted two querys from a single transactions and executed the twos on both system. Here are the results:T420
Query B_1 [55999.649 ms + 0.639 ms] http://explain.depesz.com/s/LbM
Query B_2 [95664.832 ms + 0.523 ms] http://explain.depesz.com/s/v06
MacMini
Query B_1 [56315.614 ms] http://explain.depesz.com/s/uZTx
Query B_2 [44890.813 ms] http://explain.depesz.com/s/y7Dk
Looking at the 2 B_2 queries (since they are so drastically different), the in-memory quicksorts stand out on the Dell as being *drastically* slower than the disk-based sorts on your mac-mini....
Regards,
Ang Wei Shan
Ang Wei Shan
