On Thu, Oct 2, 2008 at 7:42 PM, Jonah H. Harris <[EMAIL PROTECTED]> wrote: >> It's not the buffeting it's the checksum. The problem arises if a page is >> read in but no wal logged modifications are done against it. If a hint bit >> is modified it won't be wal logged but the page is marked dirty. > > Ahhhhh. Thanks Greg. Let me look into this a bit before I respond :)
Hmm, how about, when reading a page: read the page if checksum mismatch { flip the hint bits [1] if checksum mismatch { ERROR } else { emit a warning, 'found a torn page' } } ...that is assuming we know which bit to flip and that we accept the check will be a bit weaker. :) OTOH this shouldn't happen too often, so performance should matter much. My 0.02 Best regards, Dawid Kuroczko [1]: Of course it would be more efficient to flip the checksum, but it would be tricky. :) -- .................. ``The essence of real creativity is a certain : *Dawid Kuroczko* : playfulness, a flitting from idea to idea : [EMAIL PROTECTED] : without getting bogged down by fixated demands.'' `..................' Sherkaner Underhill, A Deepness in the Sky, V. Vinge -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers