| From: | "Sahagian, David" <david(dot)sahagian(at)emc(dot)com> |
|---|---|
| To: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | changes "during checkpointing" |
| Date: | 2013-01-11 21:04:38 |
| Message-ID: | F3CBFBA88397EA498B22A05FFA9EC49D0109CD8202@MX22A.corp.emc.com |
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| Thread: | |
| Lists: | pgsql-general |
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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