Re: Tables(s) that feed pg_controldata

On 12/09/2018 07:51 PM, Ian Barwick wrote:
> On 12/09/2018 01:25 AM, Ron wrote:
> >
> > In v9.2 (yes, I know it's EOL; there's nothing I can do about it), what 
> tables
> > do I query to get these values, and can I also get them from the streamed
> > replication host?
> >
> > - Database cluster state
> > - Latest checkpoint location
> > - Time of latest checkpoint
>
> The pg_control file is written directly by PostgreSQL, it does not derive 
> from
> any tables.
>
> From 9.6 there are a bunch of functions which will report values contained in
> pg_controldata:
>
> https://www.postgresql.org/docs/current/functions-info.html#FUNCTIONS-CONTROLDATA
>
> but you're out of luck for 9.2. The only option to query the desired 
> values via
> SQL would be to write an extension which reads pg_controldata
> (possibly as a backport of the above-mentioned functions).

Thanks.  grep(1) and cut(1) make an adequate work-around.

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