Configuring Load Balancing for Publication Service

At run time, the Publication Service services of the same load balancing group create a mutex table that was configured in the load balancing group, poll the same publishing table, and distribute loads. The Publication Service services synchronize by locking the mutex table to obtain and update the sequence information.

When you configure load balancing for Publication Service, note the following conditions:
  • When an adapter configuration contains a Publication Service service with load balancing enabled, you must select the Use Polling Batch Size check box, and set a value in the Polling Batch Size (Maximum Rows) field.
  • For Sybase, load balancing for Publication Service requires the ddl in tran option be set to true. For example, sp_dboption database_name, "ddl in tran", true

Procedure

  1. Click test_pub1.adadbmodel in the adapter configuration editor.
  2. Click the Adapter Services tab.
  3. Select ADBPublisher from the All Adapter Services panel.
  4. In the Configuration tab, specify the name in the Subject or Destination field. For example, test_loadbalancing_pub.
  5. In the Publication Options tab, select the Use Polling Batch Size check box, and set a value in the Polling Batch Size (Maximum Rows) field.
  6. Select the Enable Load Balancing check box, the Mutex Name field is displayed.
  7. Select one of the following ways to create the mutex table:
    • Enter a name in the Mutex Name field, and Publication Service will create a mutex table. For example, test_pub.
    • Define a mutex table in your database and then enter the mutex table name in the Mutex Name field. For example, you can use the following SQL statement to create a mutex table in the load balancing mode: CREATE TABLE test_pub (COL1 INT)
    The following figure shows the configuration in the Publication Options tab.

  8. Save the project.
  9. Repeat Step 1 to Step 8 to configure load balancing in Publication Service test_pub2.
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