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Answer Posted / 1647264
Following are the various IsolationLevels:
� Serialized Data read by a current transaction cannot be changed by another transaction until the current transaction finishes. No new data can be inserted that would affect the current transaction. This is the safest isolation level and is the default.
� Repeatable Read Data read by a current transaction cannot be changed by another transaction until the current transaction finishes. Any type of new data can be inserted during a transaction.
� Read Committed A transaction cannot read data that is being modified by another transaction that has not committed. This is the default isolation level in Microsoft� SQL Server.
� Read Uncommitted A transaction can read any data, even if it is being modified by another transaction. This is the least safe isolation level but allows the highest concurrency.
� Any Any isolation level is supported. This setting is most commonly used by downstream components to avoid conflicts. This setting is useful because any downstream component must be configured with an isolation level that is equal to or less than the isolation level of its immediate upstream component. Therefore, a downstream component that has its isolation level configured as Any always uses the same isolation level that its immediate upstream component uses. If the root object in a transaction has its isolation level configured to Any, its isolation level becomes Serialized.
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