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by pgaddict
3385 days ago
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MVCC has nothing to do with timestamps, particularly not with timestamps generated from gettimeofday(), but with XIDs which you might imagine as a monotonous sequence of integers, assigned at the start of a transaction. You might call that a timestamp, but the trouble is that what matters is commit order, and the XID has nothing to do with that. Which is why the MVCC requires 'snapshots' - a list of transactions that are in progress. |
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