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DataDirect Connect Drivers : Microsoft SQL Server Driver : Isolation Levels
  
Isolation Levels
The SQL Server driver supports the following isolation levels for Microsoft SQL Server:
*Read Committed with Locks * or Read Committed
*Read Committed with Snapshots *
*Read Uncommitted
*Repeatable Read
*Serializable
*Snapshot *
* Supported for Microsoft SQL Server 2005 and higher only.
The default is Read Committed with Locks (Microsoft SQL Server 2005 and higher) or Read Committed.