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.
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Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
