Yes, both Explain and Explain Analyse are taking time. As you suggested I set
the lock parameters, but no locks are observed. Also checked
pg_stat_activity and none of the sessions are either waiting are blocked.
I agree we must upgrade to latest version (9.1.10), but unfortunately kind
of resources (not only man power) we are having it is going to be extremely
challenging task for us. Of course all other options are not working then we
have to take the tough route. No choice.
I am also working with sys admin to rule any issues at the OS or VM level.
Thanks.
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