object WriteSerializable extends IsolationLevel with Product with Serializable
This isolation level will ensure snapshot isolation consistency guarantee between write operations only. In other words, if only the write operations are considered, then there exists a serializable sequence between them that would produce the same result as seen in the table. However, if both read and write operations are considered, then there may not exist a serializable sequence that would explain all the observed reads.
This provides a lower consistency guarantee than Serializable but a higher availability than that. For example, unlike Serializable, this level allows an UPDATE operation to be committed even if there was a concurrent INSERT operation that has already added data that should have been read by the UPDATE. It will be as if the UPDATE was executed before the INSERT even if the former was committed after the latter. As a side effect, the visible history of operations may not be consistent with the result expected if these operations were executed sequentially one by one.
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