Michael Monnerie <michael.monne...@is.it-management.at> wrote: 
> So, as there was that one relation that was bloatet - how could it
> be?  Autovaccuum, nightly vacuum analyze, weekly cluster - and
> still a heavy bloated toast* something. I must do something wrong.
 
Any chance you had or have long-running transactions.  We once had
very low free space in a big database which suddenly ballooned.  It
turned out an application programmer had left a connection in "idle
in transaction" state for a few days.
 
Another possibility is that you had an update or delete which
affected a lot of rows.  Even if it rolls back, it can cause bloat.
 
-Kevin

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