Rui DeSousa wrote:
> Is there a reason vacuum will not remove dead tuples other than the usual suspects?
> There are no two phase transactions and even after a restoring the database
> from binary backup with nothing connect to the restored instance;
> vacuum still does not remove the dead tuples.
There are three possibilities:
1) Active transactions:
SELECT backend_xmin, xact_start, datname, pid, query FROM pg_stat_activity WHERE state <> 'idle' ORDER BY
xact_start;
2) Prepared transactions:
SELECT xid, prepared FROM pg_prepared_xacts;
3) Lagging replication slots:
SELECT xmin, slot_name, active, active_pid FROM pg_replication_slots;
The "xid" columns will tell you which tuples VACUUM can
remove: Any tuple with "xmax" less than this are fair game.
Yours,
Laurenz Albe
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