13 Configuring the DRDA Server

13.1 Configuring the DRDA Server for DB2 UDB for z/OS

Perform the following tasks to configure the DRDA server with DB2 on an z/OS system:

1. Define the user ID that owns the package

   During first gateway usage for a particular DRDA server, an Oracle supplied package will be automatically bound to the DRDA server. The user ID and password that are used (either implied as the current Oracle user or explicitly defined in the CREATE DATABASE LINK command) must have proper authority on the DRDA Server to create the package. The followings are minimum authorities needed by this user:

   • Package privileges of BIND, COPY, and EXECUTE, for example:

     GRANT BIND    ON PACKAGE oraclegtw.* TO userid
     GRANT COPY    ON PACKAGE oraclegtw.* TO userid
     GRANT EXECUTE ON PACKAGE oraclegtw.* TO PUBLIC
     

   • Collection privilege of CREATE IN, for example:

     GRANT CREATE IN COLLECTION oraclegtw TO userid
     

   • System privileges of BINDADD and BINDAGENT, for example:

     GRANT BINDADD   TO userid
     GRANT BINDAGENT TO userid
     

   • Database privilege of CREATETAB, for example:

     GRANT CREATETAB ON DATABASE database TO userid
     

   Optionally, you can choose manual binding of the DRDA Gateway package. See Section 13.4, "Manual Binding of DRDA Gateway Packages" for instruction on how to manually bind packages for DB2 UDB for z/OS.

   Choose a user ID that will own the package and the HS_TRANSACTION_LOG table. Ensure that this user ID is defined to both DB2 and OS/390 (MVS).

2. Define the recovery user ID

   During gateway configuration, the recovery user ID and password are specified in the gateway initialization file using the HS_FDS_RECOVERY_ACCOUNT and HS_FDS_RECOVERY_PWD parameters. If a distributed transaction fails, then the recovery process connects to the remote database using the user ID and password that are defined in these parameters. This user ID must have execute privileges on the package and must be defined in the DRDA database. If the user ID is not specified in HS_FDS_RECOVERY_ACCOUNT, then the gateway attempts to connect to a user ID of RECOVER when a distributed transaction is in doubt.

   Determine the user ID and password that you will use for recovery.

3. Determine DRDA location name for DB2 instance

   The DRDA location name is required as a gateway parameter. To determine the location name, run the following SQL query from a DB2 SPUFI session:

   SELECT CURRENT SERVER FROM any_table 
   

   where any_table is a valid table with one or more rows.

   If the value returned by this query is blank or null, then the DRDA location name has not been established. Contact the system administrator to arrange to set a location name for the instance.

4. Configure DB2 Distributed Data Facility for Gateway

   DB2 Distributed Data Facility (DDF) is the component of DB2 that manages all distributed database operations, both DRDA and non-DRDA.

   If your site uses DB2 distributed operations, then DDF is probably operational on the DB2 instance that you plan to access through the gateway. If DDF is not operational, then you must configure it and start it as described in the appropriate DB2 documentation.

   Even if DDF is operational on the DB2 instance, it might be necessary to make changes to the DDF Communication Database (CDB) tables to specify the authorization conduct of DRDA sessions from the gateway. This can be done by properly authorized users with a utility such as the DB2 SPUFI utility. If you make changes to CDB tables, then you must stop and restart DDF for the changes to take effect. Refer to Chapter 14, "Security Considerations", for additional CDB tables and security information.

5. Optional step: Install Oracle Date Exit in DB2 on z/OS

   Oracle provides a DB2 Date Exit which allows customers to specify date strings using Oracle's native syntax. Installing the exit requires uploading the assembler source and JCL, customizing the JCL, and running the jobs to assemble and install the date exit. Perform the following steps to install Oracle Date Exit.

   1. Allocate a Partitioned DataSet using the parameters DSORG=PO, RECFM=FB, LRECL=80, and BLKSIZE=6160. For example,

      userid.SRCLIB
      

   2. FTP the following files from $ORACLE_HOME/dg4db2/admin to the previously allocated PDS in ASCII mode as the following PDS members:

      dg4db2_zos_dta.asm  ->  DSNXVDTA
        dg4db2_zos_dta.jcl  ->  ORAXVDTA
        dg4db2_zos_dtx.asm  ->  DSNXVDTX
        dg4db2_zos_dtx.jcl  ->  ORAXVDTX
      

   3. Edit the ORA* JCL and follow the instructions to update the JCL. Once updated, submit the JCL to assemble, link, and install the exit.

13.2 Configuring the DRDA Server for DB2 UDB for iSeries

Experience with DB2 UDB for iSeries and AS/400 is required to perform the following steps:

1. Define the user ID that owns the package

   During gateway configuration, you will need to run the Bind Package Stored Procedure to bind the gateway package on the DRDA Server. To properly bind the package, the user ID and password used when the procedure is run (either implied as the current Oracle user or explicitly defined in the CREATE DATABASE LINK command) must have proper authority on the DRDA Server to create the package. This user ID should be used to create and own the HS_TRANSACTION_LOG table. The user ID that is used to bind or rebind the DRDA package must have the following privileges on the DRDA Server:

   • Use authority on the CRTSQLPKG command:

   • Change authority on the library in which the package will be created

   Choose a user ID now that will own the package and the HS_TRANSACTION_LOG table. Ensure that this user ID is defined in DB2 UDB for iSeries and AS/400.

2. Define the recovery user ID

   During gateway configuration, the recovery user ID and password are specified in the gateway initialization file using the HS_FDS_RECOVERY_ACCOUNT and HS_FDS_RECOVERY_PWD parameters. If a distributed transaction fails, then the recovery process connects to the remote database using the user ID and password that are defined in these parameters. This user ID must have execute privileges on the package and must be defined to the DRDA database. If the user ID is not specified in HS_FDS_RECOVERY_ACCOUNT, then the gateway attempts to connect to a user ID of RECOVER when a distributed transaction is in doubt.

   Determine the user ID and password that you will use for recovery.

3. Determine DRDA location name for DB2 UDB for iSeries instance

   The DRDA location name is required as a gateway parameter. To determine the location name, run the following SQL query from a STRSQL session. If SQL is unavailable on the system, then use the AS/400 command DSPRDBDIRE to identify your LOCAL DRDA Server.

   SELECT CURRENT SERVER FROM any_table
    
   

   where any_table is a valid table with one or more rows.

   If the value returned by this query is blank or null, then the DRDA location name has not been established. Contact the system administrator to arrange to set a location name for the instance.

13.3 Configuring the DRDA Server for DB2 UDB for Linux, Unix, and Windows

Experience with DB2 UDB for Linux, Unix, and Windows, configuring the communication subsystem of DB2 UDB for Linux, Unix, and Windows, and the host System Administration tools is required to perform the following steps:

1. Define the user ID that owns the package

   During first gateway usage for a particular DRDA server, an Oracle supplied package will be automatically bound to the DRDA server. The user ID and password that are used (either implied as the current Oracle user or explicitly defined in the CREATE DATABASE LINK command) must have proper authority on the DRDA Server to create the package. The followings are minimum authorities needed by this user:

   • Package privileges of BIND and EXECUTE, for example:

     GRANT BIND    ON PACKAGE oraclegtw.* TO userid
     GRANT EXECUTE ON PACKAGE oraclegtw.* TO PUBLIC
     

   • Schema privilege of CREATEIN, for example:

     GRANT CREATEIN ON SCHEMA otgdb2 TO userid
     GRANT CREATEIN ON SCHEMA oraclegtw TO userid
     

   • Database authorities of CONNECT, BINDADD, and CREATETAB, for example:

     GRANT CONNECT   ON DATABASE TO userid
     GRANT BINDADD   ON DATABASE TO userid
     GRANT CREATETAB ON DATABASE TO userid
     

   Optionally, you can choose manual binding of the DRDA Gateway package. See Section 13.4, "Manual Binding of DRDA Gateway Packages" for instruction on how to manually bind packages for DB2 UDB for Linux, Unix, and Windows.

   Choose a user ID that will own the package and HS_TRANSACTION_LOG table. Ensure that this user ID is defined in both the DB2 instance ID and the operating system.

2. Define the recovery user ID

   During gateway configuration, the recovery user ID and password are specified in the gateway initialization file using the HS_FDS_RECOVERY_ACCOUNT and HS_FDS_RECOVERY_PWD parameters. If a distributed transaction fails, then the recovery process connects to the remote database using the user ID and password that are defined in these parameters. This user ID must have execute privileges on the package and must be defined to the DRDA database. If the user ID is not specified in HS_FDS_RECOVERY_ACCOUNT, then the gateway attempts to connect to a user ID of RECOVER when a distributed transaction is in doubt.

   Determine the user ID and password that you will use for recovery.

3. Determine DRDA location name for DB2 UDB for Linux, Unix, and Windows instance

   The DRDA location name is required as a gateway parameter. To determine the location name, run the following SQL query from a DB2 CLI session:

   SELECT CURRENT SERVER FROM any_table
   

   where any_table is a valid table with one or more rows.

   If the value returned by this query is blank or null, then the DRDA location name has not been established. Contact your system administrator to set a location name for the instance.

13.4 Manual Binding of DRDA Gateway Packages

The gateway uses several DB2 packages, which it normally uploads and binds during the first time the gateway connects to a DB2 instance. In some customer environments, the connecting userid may not have the necessary privileges to perform the binding, or some customers may prefer to manually bind the packages rather than allow the gateway to do the binding.

In such cases, Oracle provides a predefined set of packages for manual binding. These packages come with several restrictions that must be observed by setting specific gateway initialization parameters to set values otherwise, the gateway will attempt to rebind the package automatically.

This section contains the following sub-sections:

• Manually Binding of Packages for DB2 UDB for z/OS

• Manually Binding of Packages for DB2 UDB for Linux, Unix, and Windows