Configuring access to IBM Db2 for z/OS

Configure Db2 to use either the Distributed Relational Database Architecture (DRDA) access method or the Resource Recovery Services attachment facility (RRSAF) access method.

About this task

Using DRDA might yield a lower total cost of ownership than RRSAF because DRDA allows a higher percentage of Db2 work to run in SRB mode and offloaded to a zIIP specialty engine.

If you have a zIIP specialty engine, use DRDA. If you do not have a zIIP specialty engine, use RRSAF.

Before you issue Db2 requests, you must bind DRDA, RRSAF, or both into packages within each Db2 subsystem. Binding both access methods is recommended.

Configure access to Db2 for z/OS databases as follows.

1. Configuring security
2. Configure for DRDA (Distributed Relational Database Architecture) or for RRSAF (Resource Recovery Services attachment facility) access method.
   • If you are using a zIIP specialty engine, enable the RDBMS access method for DRDA:
     1. Modifying the DRDA configuration member
     2. Configuring DB2 for DRDA
   • If you are not using a zIIP specialty engine, enable the RDBMS access method for RRSAF:
     1. Modifying the RRSAF configuration member
     2. Configuring Db2 for RRSAF