This patch implements Florian's idea about how to manage snapshot xmax without the ugly and performance-losing tactic of taking XidGenLock and ProcArrayLock at the same time. I had to do a couple of slightly klugy things to get bootstrap and prepared transactions to work, but on the whole it seems at least as clean as the code we have now. Comments?
regards, tom lane
binVWXtBdczHT.bin
Description: latestCompletedXid.patch.gz
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