Re: [GENERAL] Performance problem on 2 PG versions on same query

2014-11-06 Thread Rémy-Christophe Schermesser
Thank you very much for the insights (and how to read correctly a explain :)). There is a difference in data between the 2 databases, crons where running on one and not the other. But your insights enabled us to dive deeper, thanks ! 2014-11-05 18:30 GMT+01:00 Tom Lane : > "Tomas Vondra" writes

Re: [GENERAL] Performance problem on 2 PG versions on same query

2014-11-05 Thread Tom Lane
"Tomas Vondra" writes: > Dne 5 Listopad 2014, 18:10, Tom Lane napsal(a): >> For some reason there's over 1000 times more rows in andalertsmatch in >> the 9.1.14 installation. I'm betting on a foulup somewhere in the data >> dump/restore process. > I'd bet that's mostly due to rescans in the merg

Re: [GENERAL] Performance problem on 2 PG versions on same query

2014-11-05 Thread Tomas Vondra
Dne 5 Listopad 2014, 18:10, Tom Lane napsal(a): > "Tomas Vondra" writes: >> Dne 5 Listopad 2014, 17:31, R??my-Christophe Schermesser napsal(a): >>> We have 2 instances of PG, one in 9.1.1 and 9.1.14. They have the same >>> data, schema, PG configuration, and are almost identical machines, same >>>

Re: [GENERAL] Performance problem on 2 PG versions on same query

2014-11-05 Thread Tom Lane
"Tomas Vondra" writes: > Dne 5 Listopad 2014, 17:31, Rémy-Christophe Schermesser napsal(a): >> We have 2 instances of PG, one in 9.1.1 and 9.1.14. They have the same >> data, schema, PG configuration, and are almost identical machines, same >> number of cores and memory, but different cloud provi

Re: [GENERAL] Performance problem on 2 PG versions on same query

2014-11-05 Thread Tomas Vondra
Hi, Dne 5 Listopad 2014, 17:31, Rémy-Christophe Schermesser napsal(a): > Hi, > > We have 2 instances of PG, one in 9.1.1 and 9.1.14. They have the same > data, schema, PG configuration, and are almost identical machines, same > number of cores and memory, but different cloud provider. The data was