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# Configure transaction properties

Before you begin

Create messaging bridge instances

A messaging bridge provides transaction semantics when the QOS is Exactly-once. Use this page to define the transaction configuration for this messaging bridge instance.

To configure transaction properties:

1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
2. In the left pane of the console, expand Services > Messaging and select Bridges.
3. On the Summary of Messaging Bridges page, select the messaging bridge instance for which you will configure transaction properties.

   If the table is empty, refer to Create messaging bridge instances.

4. On the Configuration > Transactions tab, update as necessary:
   1. Transaction Timeout -- Amount of time the transaction manager waits for each transaction before timing it out..
   2. Batch Size -- Number of messages that are processed within one transaction.
   3. Batch Interval -- Amount of time the bridge waits before sending a batch of messages in one transaction.

   For more information about the connection retry properties, see Configuration Options.

5. Click Save.
6. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
   Not all changes take effect immediately—some require a restart (see Use the Change Center).