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Part 2: The 32-Bit/64-Bit Drivers : The Oracle Wire Protocol Driver : Isolation and Lock Levels Supported
  
Isolation and Lock Levels Supported
Oracle supports isolation level 1 (read committed) and isolation level 3 (serializable). Oracle supports record-level locking.
Refer to "Locking and Isolation Levels" in the DataDirect Connect Series for ODBC Reference for details.