Robert Haas wrote:
> How about this one?  The administrator sets up a master and a slave.
> She's heard about this new Hot Standby feature and so decides to
> enable it on the slave just to play around with it.  Subsequently, she
> takes a better job at another company and they hire a new
> administrator, who thinks the Hot Standby WAL may be causing a
> performance problem on the master, so he switches wal_mode to archive.
>  Six months later the primary fails.

Umm, I don't see the problem. For high availability purposes, the
standby works just as well with wal_mode='archive'. Or are you saying
that the standby was configured with recovery_connections='on', and
failed to start for those six months because hot standby could not be
enabled, and no-one noticed?

-- 
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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