object SnapshotIsolation extends IsolationLevel with Product with Serializable
This isolation level will ensure that all reads will see a consistent snapshot of the table and any transactional write will successfully commit only if the values updated by the transaction have not been changed externally since the snapshot was read by the transaction.
This provides a lower consistency guarantee than WriteSerializable but a higher availability than that. For example, unlike WriteSerializable, this level allows two concurrent UPDATE operations reading the same data to be committed successfully as long as they don't modify the same data.
Note that for operations that do not modify data in the table, Snapshot isolation is same as Serializablity. Hence such operations can be safely committed with Snapshot isolation level.
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