In regards to 9.1.x, I would like to learn some details of the nature of 
"checkpointing"

=== Question 1 ===

- page 123 is dirty

- "checkpointing" starts

- page 123 gets written to disk, as part of this checkpoint

- page 123 gets modified again
  ? Does it get written to disk again, as part of this checkpoint?

- "checkpointing" finishes


=== Question 2 ===

- page 123 is dirty

- "checkpointing" starts

- page 123 gets modified again

- page 123 gets written to disk, as part of this checkpoint
  ? So does the most recent mod get written to disk, even if that mod is not 
committed yet ?

- "checkpointing" finishes


=== Question 3 ===

When does the full-page-writing to WAL happen ?
Is it after the start of the "checkpointing" or after the finish of the 
"checkpointing" ?


Thanks,
-dvs-

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