Tobias Brox <tobias(at)nordicbet(dot)com> writes:
> (gdb) bt
> #0 0xb7c599f8 in select () from /lib/tls/libc.so.6
> #1 0x08253c53 in pg_usleep ()
> #2 0x0812ee93 in vacuum_delay_point ()
> #3 0x0812f2a5 in lazy_vacuum_rel ()
> #4 0x0812ef7b in lazy_vacuum_rel ()
> #5 0x0812b4b6 in vac_update_relstats ()
That doesn't look particularly blocked, and if you are seeing
reads/writes too, then it's doing something.
> It seems stuck, has had the same transid for a long while, and the
> number of undeletable dead rows in our tables are increasing.
Perhaps you have overly aggressive vacuum cost delay settings?
regards, tom lane