measure database contention

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Hi,

we have a some bad queries (developers are working on that), some of
them run in 17 secs and that is the average but when analyzing logs i
found that from time to time some of them took upto 3 mins (the same
query that normally runs in 17secs).

so my question is: how could i look for contention problems?

-- 
Atentamente,
Jaime Casanova
Soporte y capacitación de PostgreSQL
Asesoría y desarrollo de sistemas
Guayaquil - Ecuador
Cel. +59387171157

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