Andres Freund <> writes:
> On 2016-02-19 15:09:58 -0500, Tom Lane wrote:
>> I see no need for an additional mechanism.  Just watch pg_control until
>> you see DB_IN_PRODUCTION state there, then switch over to the same
>> connection probing that "pg_ctl start -w" uses.

> That's afaics not sufficient if the standby was using hot standby, as
> that'll let -w succeed immediately, no?

Oh, now I get Fujii-san's point.  Yes, that wouldn't prove anything
about whether you could do a write transaction immediately.

                        regards, tom lane

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