Setting Transaction Isolation Levels for connections to Progress/OpenEdge Enterprise Edition Multi-Tier Drivers Log in to the Broker host. Use a text editor to open the active Rulebook (default is /<...OpenLink Installation...>/bin/oplrqb.ini). Locate the relevant Environment section, e.g., [Environment PROGRESS110SQL], [Environment PROGRESS100SQL], or [Environment PROGRESS91SQL]. Add the following keyword to the existing list of parameters: DEFAULT_TXN_ISOLATION Set your desired transaction isolation level. The options are: READ_UNCOMMITTED READ_COMMITTED REPEATABLE_READ SERIALIZABLE For instance: DEFAULT_TXN_ISOLATION = READ_UNCOMMITTED Save your changes and exit the file. Restart or reinitialize your Request Broker service to activate the change. Lite Edition Single-Tier Drivers Log in to the machine hosting the driver. Launch the ODBC Administrator. Locate & highlight your Data Source Name. Click Configure. Locate the Default Transaction Isolation menu. Select your desired isolation level. Save the changes to your DSN.