| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, bgrimm(at)zaeon(dot)com, pgsql-bugs(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Bug #613: Sequence values fall back to previously chec kpointed |
| Date: | 2002-03-13 22:29:08 |
| Message-ID: | 11823.1016058548@sss.pgh.pa.us |
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| Lists: | pgsql-bugs pgsql-hackers |
I said:
> Mmm ... maybe. Is this safe if a checkpoint is currently in progress?
> Seems like you could look at RedoRecPtr and decide you are okay, but you
> really are not if checkpointer has already dumped sequence' disk
> buffer and will later set RedoRecPtr to a value beyond the old LSN.
Oh, wait, I take that back: the checkpointer advances RedoRecPtr
*before* it starts to dump disk buffers.
I'm still worried about whether we shouldn't try to simplify, rather
than add complexity.
regards, tom lane
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