We have given two different implementations of the READ COMMITTED isolation level: the locking implementation in Section 21.2 and the read-consistency implementation in Section 21.5. Give an example of a schedule in which the two implementations produce different results.
What will be an ideal response?
A SELECT statement using a non-insensitive cursor, followed by some FETCH
statements. In the Read Consistency version, all fetches are from the same snapshot
of the database. In the locking implementation, different fetches might come from
different snapshots.
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