"Erik Rijkers" <e...@xs4all.nl> writes:
> I have a 200 GB dev database running under 9.4devel  that I thought I could 
> now, for test purposes, compile a patched
> postgres binary for (i.e.: a HEAD + 
> inverse_transition_functions_v1.5.patch.gz binary), so as to avoid an initdb 
> and use
> the existing 200 GB data.

That's not going to work for any patch that touches the initial contents
of the system catalogs.

> Is there a way I can use the existing database and avoid both initdb and this 
> error?

Use pg_upgrade to move the data into a newly initdb'd directory.  Note
you will need both unpatched and patched executables for this.

                        regards, tom lane

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