To make a Multi-Version Read Consistency without reading a Dirty Reads to the accuracy of the information that will be of use to Readers and Writers, is that the data must not block each other (read data do not block the author information and author information block data readers) so when there is a transaction that makes changes to the data, but there is no commit or rollback of other users must be able to read the data in the row. By seeing the series before it was changed, because it has not yet confirmed the change is real.
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