1. Logon Group

t-code：SMLG 建立Application Servers Group , 然后通过Message Server来实现负载均衡

2. DSO activate Group

2.1 Create RFC Group

     t-code:RZ12

2.2 Assign Applcation server to the group

2.3 Load Balancing for ODS Object Data Activation

t-code: RSODSO_SETTINGS to specify the group

3. Background job Group

3.1 to assign application server to default: SAP_DEFAULT_BTC

t-code: SM61