On Tue, Jun 14, 2022 at 10:21:16PM -0400, Robert Haas wrote: > On Tue, Jun 14, 2022 at 9:56 PM Peter Geoghegan <p...@bowt.ie> wrote: >> Technically we don't already do that today, with the 16-bit checksums >> that are stored in PageHeaderData.pd_checksum. But we do something >> equivalent: low-level tools can still infer that checksums must not be >> enabled on the page (really the cluster) indirectly in the event of a >> 0 checksum. A 0 value can reasonably be interpreted as a page from a >> cluster without checksums (barring page corruption). This is basically >> reasonable because our implementation of checksums is guaranteed to >> not generate 0 as a valid checksum value. > > I don't think that 'pg_checksums -d' zeroes the checksum values on the > pages in the cluster.
Saving the suspense.. pg_checksums --disable only updates the control file to keep the operation cheap. -- Michael
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