"An open transaction" is the first place to look.
On 8/5/19 12:03 PM, Wells Oliver wrote:
As a follow up, n_dead_tup from pg_stat_sys_tables for this TOAST table is 7447444, live tuples, 623982, and tup_del 20823469. vacuum_count is 0.
Why can't I free those rows up?
Appreciate it, guys. I understand it being large isn't itself a problem, but relative to history and the lack of real changes, it's just strange and I'd like to better understand what is going on...
I tracked it down to a specific table, and then doing a VACUUM FULL ANALYZE on that table yields: 108765 dead row versions cannot be removed yet.
Which strikes me as odd. Any reading I can do to better understand why so many (relative to the overall table size) dead rows cannot be removed?
Wells Oliver <wells.oliver@gmail.com> writes:
> Yeah, trying to figure out what actual table is clearly in need of a vacuum
> b/c of the size of that toast table.
Something like
select relname from pg_class
where reltoastrelid = 'pg_toast.pg_toast_NNN'::regclass;
(or, if you have potential duplicate relnames, select oid::regclass ...)
The mere fact that it's big does not indicate a problem, though.
regards, tom lane
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Angular momentum makes the world go 'round.
