Re: automatic vacuum on pg_statistic pg_toast area blocks all queries in hot standby

Hi,

Thanks for your feedback. Someone finally replies to this thread. I am not
quite clear of your solution, so I need more info from you.

First of all, we do not enable hot_standby_feedback on SLAVE DB.

postgres=# show hot_standby_feedback;
hot_standby_feedback
----------------------
off
(1 row)

Secondly, where do you run "select txid_current() into res1" and "select
txid_current() into res2" ?

Even if you set MASTER vacuum_defer_cleanup_age to certain value, autovacuum
still can kick in anytime and may conflict query on the target table. So
setting vacuum_defer_cleanup_age to a value can really reduce the chance of
such situation?

Thanks a lot,

Pius

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