Non-repeatable Reads (CloudMonk.io)

Non-Repeatable Reads

Non-repeatable reads are a phenomenon in database systems where a transaction reads the same data multiple times within the same transaction but obtains different results each time. This inconsistency arises when another transaction modifies the data being read between the multiple reads of the first transaction. As a result, subsequent reads within the same transaction return different values, causing non-repeatable reads. Non-repeatable reads occur due to the lack of isolation between transactions, violating the consistency property. To address non-repeatable reads, database systems implement isolation levels, such as Repeatable Read or Serializable, which ensure that data read by a transaction remains consistent throughout the transaction's execution, regardless of concurrent modifications by other transactions. By providing stronger isolation guarantees, these isolation levels prevent non-repeatable reads and maintain data consistency and integrity. [https://en.wikipedia.org/wiki/Isolation_(database_systems)#Non-repeatable_read]