1. Microservices Architecture Documentation
  2. Prepare
  3. Prepare Databases
  4. Db2 z/OS
  5. Prepare Database Connection

Prepare Database Connection

Learn about configuring database connection, system and parameters settings for Oracle GoldenGate for Db2 z/OS.

Specifying the Number of Connection Threads

Every Oracle GoldenGate process makes a database connection. Depending on the number of processes that you will be using and the number of other Db2 connections that you expect, you might need to adjust the following Db2 system parameters on the DSNTIPE Db2 Thread Management Panel:

  • MAX USERS (macro DSN6SYSP CTHREAD)

  • MAX TSO CONNECT (macro DSN6SYSP IDFORE)

  • MAX BATCH CONNECT (macro DSN6SYSP IDBACK)

Log reads use RRSAF, allow:

  • Two Db2 threads per process for each of the following:

    • Extract

    • Replicat

    • The Admin Client command DBLOGIN (logs into the database)

    • DEFGEN utility (generates data definitions for column mapping)

  • One extra Db2 thread for Extract for IFI calls.

  • One extra Db2 thread for each SQLEXEC parameter statement that will be issued by each Extract and Replicat process.

Ensuring ODBC Connection Compatibility

To ensure that you configure the Db2 ODBC initialization file correctly, follow the guidelines in the Db2 UDB z/OS ODBC Guide and Reference manual. One important consideration is the coding of the open and close square brackets (the [ character and the ] character). The square bracket characters are "variant" characters that are encoded differently in different coded character set identifiers (CCSID), but must be of the IBM-1047 CCSID in the ODBC initialization file. Db2 ODBC does not recognize brackets of any other CCSID. Note the following:

  • The first (or open) bracket must use the hexadecimal characters X'AD' (0xAD).

  • The second (or close) bracket must use the hexadecimal characters X'BD' (0xBD).

To set the correct code for square brackets, use any of the following methods.

  • Use the hex command in OEDIT and change the hex code for each character appropriately.

  • Use the iconv utility to convert the ODBC initialization file. For example, to convert from CCSID IBM-037 to IBM-1047, use the following command: 

    iconv -f IBM-037 -t IBM-1047 ODBC.ini > ODBC-1047.ini 
    mv ODBC-1047.ini ODBC.ini

  • Change your terminal emulator or terminal configuration to use CCSID IBM-1047 when you create or alter the file.