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Transaction Isolation Levels (cont)

Implication of transaction isolation levels:

Isolation
Level		 Dirty
Read		 Nonrepeatable
Read		 Phantom
Read
Read
Uncommitted		 Possible Possible Possible
Read
Committed		 Not Possible Possible Possible
Repeatable
Read		 Not Possible Not Possible Possible
Serializable Not Possible Not Possible Not Possible