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Isolation level Oracle provides three transaction isolation levels. These transaction isolation levels are: 1. Read Committed: The read committed transaction isolation level is the Oracle default. With this setting, each query can see only data committed before the query, not the transaction, began. 2. Serializable: The serializable transaction isolation level is not supported with distributed transactions. With the serializable transaction isolation level, only data that was committed at the start of the transaction plus those made by the transaction itself through INSERTs, UPDATEs and DELETEs can be accessed by a query. 3. Read Only: With the Read Only transaction isolation level, only data that was committed at the start of the transaction can be accessed by a query. No modification to the data is allowed. Prajakta Pandit 03-2-2017 12:35 AM

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