Jean-Christophe Praud <j...@steek.com> writes:
> Indeed, the tables I tried to vacuum have locks on them.  
> AccessShareLock belonging to queries which seem sleeping. I tried to 
> kill these queries but pg_cancel_backend() has no effect, and the 
> process doesn't get the 15 signal.

> How can I get rid of these blocking queries without restarting the 
> server ? They are not listed as "waiting" in pg_stat_activity.

Have you tried killing the connected client sessions?

                        regards, tom lane

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