Greg Stark escribió: > Writing this explanation did bring to mind one solution which we had > already discussed for other reasons: not marking blocks dirty after hint > bit setting.
How about when a hint bit is set and the page is not already dirty, set the checksum to the "always valid" value? The problem I have with this idea is that there would be lots of pages excluded from the CRC checks, a non-trivial percentage of the time. Maybe we could mix this with Simon's approach to counting hint bit setting, and calculate a valid CRC on the page every n-th non-logged change. -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
