[keynha]

Dropping the explicit P_DIRTY flag in 1.0 is a neat change. What tracks which pages still need to be written back at commit now that the flag is gone?

[hyc_symas]

The txnID was added to the page header to enable support for incremental backup. As a consequence, it's sufficient to compare a page's txnID to the current txnID to know if it's dirty or not, and spilled pages don't need a cleanup pass to clear their dirty bit on commit so commits of large txns are faster now.