Thanks for the update.
> The main difference is that 8.2 has only one process working at a time,
> whereas in 8.3 and later there can be several. When there's only one
> process, the only way for it to process several databases is
> sequentially; the naptime is how long to sleep between each item in the
> list.
> In 8.3, naptime is the time that lapses between two processes starting,
> while respecting the limit of maximum processes that you configured in
> max_workers. So if the time is already up but all processes are busy
> elsewhere, the next autovacuum will have to wait until one of those
> finishes.
> Since there are multiple processes, you can configure more so that all
> tables can be vacuumed in time.
>> Is there any way to find out the start time of "last_autovaccum" and/or 'last_autoanalyze" for a given table in
8.2.3? So that I can isolate the tables that are taking too long time to complete vacuum and/or analyze and I can
performthem externally if need.
> No, I don't think there is in 8.2, unless you crank the debug level down
> to DEBUG2 which means log a lot of stuff (probably too noisy to be
> useful).