Bruce Momjian wrote: > Tom Lane wrote: >> >> The suggestions that were made upthread about moving the hint bits >> could resolve the second objection, but once you do that you might >> as well just exclude them from the CRC and eliminate the guessing. > > OK, crazy idea #3. What if we had a per-page counter of the number of > hint bits set --- that way, we would only consider a CRC check failure > to be corruption if the count matched the hint bit count on the page.
Can I piggy-back on Bruce's crazy idea and ask a stupid question? Why are we writing out the hint bits to disk anyway? Is it really so slow to calculate them on read + cache them that it's worth all this trouble? Are they not also to blame for the "write my import data twice" feature? -- Richard Huxton Archonet Ltd -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
