| http://www.w3.org/ns/prov#value | - As it turns out, most cases where we are overwriting a page in an existing relation are going to be coming from shared_buffers, but there are other similar cases, e.g. it could be in temp_buffers, or it could be a page from an SLRU, or we could repeatedly overwrite the current WAL page (though it would be pretty unlucky if the kernel evicted something that hot).
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