beginnerIsolation Levels — Dirty Read, Phantom Read, Non-Repeatable Read
What are the three main read anomalies in database transactions?
Dirty Read: reading data that another transaction has written but not yet committed. If that transaction rolls back, you've read data that never officially existed. Prevented at READ COMMITTED. Non-Repeatable Read: within a single transaction, reading the same row twice returns different values because another transaction committed a change between reads. Prevented at REPEATABLE READ. Phantom Read
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