Re: Add %r substitution for psql prompts to show recovery status

On 01/23/2018 03:19 AM, Peter Eisentraut wrote:
> On 1/9/18 15:36, Peter Eisentraut wrote:
>> On 12/7/17 19:54, Tatsuo Ishii wrote:
>>>> On Wed, Dec 6, 2017 at 9:19 PM, Ian Barwick <ian(dot)barwick(at)2ndquadrant(dot)com> wrote:
>>>>> Note this substitution sends a "pg_is_in_recovery()" query to the server
>>>>> each time it's encountered; unless there's something I'm overlooking I
>>>>> think that's the only reliable way to determine current recovery status.
>>>>
>>>> That seems kinda painful.
>>>>
>>>> And what happens in an aborted transaction?
>>>
>>> Yeah. I think we need some from help backend for this. For example, a
>>> parameter status message can be used here. If PostgreSQL moves to the
>>> recovery state or vice versa, PostgreSQL sends the parameter status
>>> message to frontend.
>>
>> I agree a backend status message is the right way to do this.
>>
>> We could perhaps report transaction_read_only, if we don't want to add a
>> new one.
>
> I'm setting this CF item to returned with feedback, since it would
> apparently be a much bigger change than then initial patch.

Yup, agree :)

Thanks for the feedback!

Regards

Ian Barwick

--
Ian Barwick http://www.2ndQuadrant.com/
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