Repeatable Read, Phantom Read are the following types of concurrency problems.
When a transaction reads a variable once, but then tries to read that same variable again, an error appears stating that the value does not exist. This is known as the "phantom read" problem.
When the same query returns multiple sets of rows at various points in time during a transaction, it is known as the "phantom problem." For example, if a SELECT is executed twice and the second time produces a row that was not returned the first time, the second row is referred to as a "phantom" record.
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