On Wed, Oct 1, 2008 at 11:36 AM, Tom Lane <[EMAIL PROTECTED]> wrote: >> I probably wouldn't compare checksumming *every* WAL record to a >> single block-level checksum. > > No, not at all. Block-level checksums would be an order of magnitude > more expensive: they're on bigger chunks of data and they'd be done more > often.
That's debatable and would be dependent on cache and the workload. In our case however, because shared buffers doesn't scale, we would end up doing a lot more block-level checksums than the other vendors just pushing the block to/from the OS cache. -- Jonah H. Harris, Senior DBA myYearbook.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
