"Zeugswetter Andreas SB SD" <ZeugswetterA@spardat.at> writes:
> But it can contain newer blocks than WAL records would expect.
> Will it not matter if e.g. a page split for a btree index is already in the
> index file, but a WAL record exists, that references the not yet split page?
No. This is not different from the crash-recovery situation: we always
check to see if the update was already applied.
regards, tom lane