[HACKERS] View running statements

[Vlad Arkhipov]

Is there any way to inspect current running statements (optionally full 
stack of these statements)? I've found there is error_context_stack 
variable in each backend, but it seems there is no way to get this 
variable from another backend. It will be great if Postgres have such 
kind of mechanism, for instance a system table that consists statements 
running longer than certain time (5-10 seconds).

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