sharp or fuzzy checkpoint?

Tatsuo Ishii wrote:

I'm interested in point-in-time-recovery (or archive recovery) too.
I'm wondering current implementation of CHECKPOINT is whether "SHARP"
or "FUZZY" checkopint. If it's a "SHARP" one, it would be a serious
performance bottle neck according to the Gray's transaction book. Does
anybody know anything about that?

We have a FUZZY checkpoint because we continue processing during
the checkpoint period. In fact, we can add WAL files during the
checkpoint activity.

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