6 Configuring the Gateway

6.1.1 Running the Commands

All gateway commands can be accessed through a main menu. To invoke the main menu, enter:

ADDLIBLE  instance_name
GO CMDORAGTW

where: instance_name is the name given to the gateway when it was installed.

The main menu panel that is illustrated in Example 6-1, "CMDORAGTW Oracle Commands Panel" is displayed:

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 CMDORAGTW                   Oracle Commands
                                                            System:  AS400A
 Select one of the following:

  1. Create instance
  2. Change network settings
  3. Change prestart job settings
  4. Change gateway initialization settings
  5. Change debugging options
  6. Change Oracle Data Dictionary objects (batch)
  7. Change Recovery Profile Parameters


 Selection or command
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 F3=Exit  F4=Prompt  F9=Retrieve  F12=Cancel

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Enter the choice number (1, 2, 3, 4, 5, 6, or 7) or the corresponding command name:

• CRTORAGTWI

• CHGORANET

• CHGORAPJE

• CHGORATUN

• CHGGTWDBG

• CRTORADDB

• CHGRECOPRF

After you have made your selection, press Enter to continue. The panel for the command is displayed. Command panels are described under the individual commands.

6.1.2 CRTORAGTWI, Copy the Gateway

You can have as many copies of a gateway instance on your system as you want. After you have installed a release 10 gateway, if you need another instance of the gateway, before you issue the CRTORAGTWI command, then you must:

• Shut down the instance you are about to copy. Use the ENDSBS command with the instance name as the operand to perform the shutdown operation.

• Ensure that you log on with a user profile that has the *SECADM,*JOBCTL, *ALLOBJ, and *SYSCFG special authorities. The user profile QSECOFR as distributed by IBM has these authorities.

• Ensure that a library or collection with the same name as the instance name to be created does not already exist. If it does exist, then it must be empty or must have only those objects that would result from a SQL CREATE COLLECTION command.

After entering 1 at the main menu panel, or CRTORAGTWI, the panel in Example 6-2, "Create Oracle Transparent Gateway Panel" is displayed.

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                  Create Oracle Transparent Gateway V10.2.0.1.0
                                                              System:  AS400A
 Type choices, press Enter.

  Existing instance name ....        ORACLE        Name (up to six characters)
  Instance name to create ....                     Name (up to six characters)





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 F1=Help  F4=Prompt  F9=Retrieve  F12=Cancel

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Enter the name of the new instance to be created and press Enter to continue. The panel in Example 6-3, "Create Oracle Transparent Gateway Panel, with New Values" appears.

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                  Create Oracle Transparent Gateway V10.2.0.1.0
                                                            System:  AS400A
 Type choices, press Enter.

  Existing instance name .......    ORACLE        Name (up to six characters)
  Instance name to create ......    ORANEW        Name (up to six characters)
  Instance password ............    ORANEW        1-10 characters
  Recovery user profile ........    ORANEW        Name
  Recovery user password .......    ORANEW        1-10 characters
  Prestart jobs ................    *YES          *YES, *NO
  TCP/IP port number ...........    1521          1024-65534
  Auxiliary storage pool id ....    1             1-16
  Install Data Dictionary
    Support ....................    *NO           *YES, *NO


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 F1=Help  F4=Prompt  F9=Retrieve  F12=Cancel

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The first two entries are set from the previous screen and cannot be changed:

Existing instance name is a name from one character to six characters long. The default is whatever is in the ORA_HOME data area. If you ADDLIBLE instance_name, then the value in the ORA_HOME data area will be the existing instance name.

Instance name to create is a name from one character to six characters long.

You must fill in the following choices:

Instance password is the password for the user ID that will be created for the new user profile. The user ID has the same name as the newly-created instance name. You should change this password for security reasons.

Recovery user profile is a profile name that you enter, or you can use the default of the newly created gateway instance name.

Recovery user password is a password for the recovery user profile. The default is the newly created gateway instance name. You should change this for security reasons. Use the OS/400 CHGUSRPRF command to make the change. Then, use the CHGRECOPRF command (refer to "CHGRECOPRF, Change Recovery Profile Parameters").

Prestart jobs prestarts the TCP/IP jobs. By default, two TCP/IP jobs are prestarted. Use *YES to prestart the TCP/IP server jobs. Use *NO to prestart NO TCP/IP server jobs.

You can change how many jobs are prestarted by changing the value of the initial number of TCP/IP jobs parameter with the CHGORAPJE command. For more information, refer to "CHGORAPJE, Change Prestarted Job Parameters" .

TCP/IP port number will be the same as the port number of the cloned instance. You should enter a different port number because each instance requires a unique port number.

Auxiliary storage pool id uses the default of 1, or you can enter another ID if you have additional auxiliary storage pools defined.

Install Data Dictionary Support Enter *YES if you wish to reinstall the Data Dictionary support. The default is *NO. If you are copying (cloning) a gateway, then the Data Dictionary was most likely installed when the copied (cloned) gateway itself was installed. In that case, you do not need to reinstall the Data Dictionary.

6.1.3 CHGORANET, Change Network Parameters

After entering 2 at the main menu panel or by entering the CHGORANET command, enter the appropriate instance name and press Enter. The panel in Example 6-4, "Change Oracle Network Parameters Panel" appears. Except when you are changing the value of the TCP/IP port number, you should use CHGORANET only under the guidance of a representative from Oracle Support Services. Enter the new values and press Enter to continue. The new values do not take effect until you shut down and restart the gateway that was specified in the Existing instance name parameter of the command.

___________________________________________________________________________________________________
                      Change Oracle Transparent Gateway
                                                            System:  AS400A
 Type choices, press Enter.

  Existing instance name .......    ORACLE        Name
  TCP/IP port number ...........    1521          1024-65534
  Client trace level ...........    *OFF          *OFF, *USER, *ADMIN, 16
  Listener trace level .........    *OFF          *OFF, *USER, *ADMIN, 16
  Server trace level ...........    *OFF          *OFF, *USER, *ADMIN, 16
  Regenerate files .............    *NO           *YES, *NO



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 F1=Help  F4=Prompt  F9=Retrieve  F12=Cancel

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6.1.4 CHGORAPJE, Change Prestarted Job Parameters

On the OS/400 command line, use the CHGORAPJE command, or use the GO CMDORAGTW command, specify option 3, and press Enter. The panel in Example 6-5, "Change Oracle Prestart Parameters Panel" appears. Enter the new values and press Enter to continue.

___________________________________________________________________________________________________
                      Change Oracle Prestart Parameters
                                                            System:  AS400A
 Type choices for prestart jobs, press Enter.

  Existing instance name ............     ORACLE         Name
  Start TCP/IP jobs .................     *YES           *SAME, *YES, *NO
  Initial number of TCP/IP jobs......     2              1-1000, *SAME
  TCP/IP threshold ..................     1              1-1000, *SAME
  Additional number of TCP/IP jobs ..     2              0-999, *SAME
  Maximum number of TCP/IP jobs .....     *NOMAX         *SAME, *NOMAX
  Start TCP/IP listener .............     *YES           *SAME, *YES, *NO


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 F1=Help  F4=Prompt  F9=Retrieve  F12=Cancel

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For information about what values you should enter for these parameters, move the cursor to the value on the panel and press PF1.

The new values do not take effect until you shut down and restart the gateway that is specified in the Existing instance name parameter of the command.

6.1.5 CHGORATUN, Change Initialization Parameters

On the OS/400 command line, use the CHGORATUN command, or use the GO CMDORAGTW command and specify option 4. Then press Enter. The panel in Example 6-6, "Change Oracle Gateway Initialization Parameters (first page of panel)" appears. CHGORATUN uses two panels. Refer to Example 6-6, "Change Oracle Gateway Initialization Parameters (first page of panel)" and Example 6-7, "Change Oracle Gateway Initialization Parameters (second page of panel)".

For information about what values you should enter for these parameters, move the cursor to the value on the panel and press PF1.

Enter the new values on the panels. Before entering values for the DATABASE DOMAIN, GATEWAY NATIONAL LANGUAGE, RPC FETCH REBLOCKING, and RPC FETCH SIZE gateway initialization parameters, read the following notes:

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               Change Oracle Gateway Initialization Parameters
                                                        System:  AS400A
 Type choices, press Enter.

 Existing instance name .........   ORACLE           Name
 Database Domain ................   WORLD
 Database Name...................   ORACLE
 Array block size................   100              0-32767
 Gateway language ...............   american_america.we8ebcdic37
                                                     Language ID (NLS_LANG)
 V4 Graphic and UCS-2
   Compatibility mode ...........  *NO               V4 Graphic and UCS-2
                                                       Compatibility mode
                                                       (ORAGRAPH4)
 Maximum Date ...................                    ORA_MAX_DATE
 Option for CCSID=65535 fields     *BITDATA          *BITDATA, *CHARDATA
 User Profile CCSID .............  *SYSVAL           *SAME, *SYSVAL, *HEX, CCSID
                                                       value

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 F1=Help  F4=Prompt  F9=Retrieve  F12=Cancel

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               Change Oracle Gateway Initialization Parameters

                                                               System:  AS400A
 Type choices, press Enter.

 Change Isolation Level........  *CHG             *CHG, *CS, *RR
 Set gateway for READ-ONLY.....  *NO              *YES, *NO
 Maximum Number Cursors........  200              50-200
 RPC Fetch Reblocking .........  *YES             *YES, *NO
 RPC Fetch Size ...............  40000            4000-50000





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 F1=Help  F4=Prompt  F9=Retrieve  F12=Cancel

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The new values do not take effect until you shut down and restart the gateway that is specified in the Existing instance name parameter of the command.

6.1.6 CHGGTWDBG, Change Debugging Parameters

This command is used for isolating the cause of a suspected gateway problem. Use CHGGTWDBG only under the guidance of a representative from Oracle Support Services.

On the OS/400 command line, use the CHGGTWDBG command, or use the GO CMDORAGTW command and specify option 5, then press Enter. Enter the appropriate instance name and press Enter. The panel in Example 6-8, "Change Oracle Gateway Debugging Option Panel" appears. For more information about the value choices, move the cursor to the value on the panel and press PF1.

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               Change Oracle Gateway Debugging Options
                                                        System:  AS400A
 Type choices for debugging options, press Enter.

 Existing instance name ...........   ORACLE        Name
 Use gateway debugging version ....   *NORMAL       *NORMAL, *DEBUG
 Gateway pause during job start ...   *NORMAL       *NORMAL, *PAUSE
 Gateway show GETENV messages .....   *NORMAL       *NORMAL, *YES
 Gateway continue after error .....   *NORMAL       *NORMAL, *CONTINUE
 Gateway hang on error ............   *NORMAL       *NORMAL, *HANG
 Gateway hang time in minutes .....   *DAY          *NORMAL, 1-10080, *HOUR
                                                    *DAY, *WEEK
 Gateway trace level ..............   0             0-255
 Listener pause during job start ..   *NORMAL       *NORMAL, *PAUSE
 Listener show GETENV messages ....   *NORMAL       *NORMAL, *YES
 Listener continue after error ....   *NORMAL       *NORMAL, *CONTINUE
 Listener hang on error ...........   *NORMAL       *NORMAL, *HANG
 Listener hang time in minutes ....   *DAY          *NORMAL, 1-10080, *HOUR
                                                    *DAY, *WEEK


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 F1=Help  F4=Prompt  F9=Retrieve  F12=Cancel
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After entering the new values, press Enter to continue. The new values do not take effect until you shut down and restart the gateway specified in the Existing instance name parameter of the command.

6.1.7 CRTORADDB, Create Data Dictionary Views

This command submits a batch job to create Oracle data dictionary views of the system catalog. If you are going to run an application such as Oracle Developer, then you need to create data dictionary views. Therefore, if you create these views when originally installing the gateway, then you should not need to create them again.

On the OS/400 command line, use the CRTORADDB command, or use the GO CMDORAGTW command and specify option 6. Then press Enter. Enter the appropriate instance name and press Enter. A batch job is submitted. No additional panel appears.

The Oracle Data Dictionary views of the system catalog are used by all Oracle Gateway instances on that AS/400. One copy of these views is on each AS/400.

6.1.8 CHGRECOPRF, Change Recovery Profile Parameters

This command changes the OS/400 User Profile name or password, or both, for the User Profile name or password that the gateway uses when directed to perform transaction recovery by the Oracle server. Transaction recovery is necessary when any failure occurs during a distributed transaction. The User Profile name and password are created by the OS/400 CRTUSRPRF command or are changed by the OS/400 CHGUSRPRF command.

__________________________________________________________________________________________
                   Change Oracle Recovery Profile Parameters
                                                             System:   AS400A
 Type choices, press Enter.

 Existing instance name . . . .   ORACLE       Name
 Recovery Profile Name  . . . .   ORACLE       Profile Name
 Recovery Profile Password  . .                Password
 Confirmation of Recovery
   Profile Password . . . . . .                Password



 F1=Help  F4=Prompt  F9=Retrieve  F12=Cancel

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Enter the User Profile name in the Recovery Profile Name field, or leave it as it is. Enter the password for the User Profile name on the next two lines. The password is stored in an encoded form. Because this password is no longer visible as plain text, extra care may be required to keep the recovery password synchronized between the AS/400 computer and the gateway. Refer to the following note.

6.2.1 Retrieving Data

The gateway can retrieve multiple rows from a table or view with a single fetch. The gateway uses the BLOCKSIZE data area to determine the number of rows to retrieve. These conditions apply for the BLOCKSIZE data area:

• If the BLOCKSIZE data area is set to 0, then no block retrieval is performed. This is similar to setting BLOCKSIZE to 1.

• If the BLOCKSIZE data area is set to n, then the gateway retrieves n rows from DB2/400 in a single fetch, where n is a value from 1 to 32767.

• If the BLOCKSIZE data area does not exist, then the gateway will retrieve one row per fetch from DB2/400.

  Note:

  For performance reasons, Oracle recommends that the BLOCKSIZE data area be set between 10 and 100.

The gateway uses a default value of 100 for the BLOCKSIZE data area. The BLOCKSIZE value is used for substitution for host variable N in a SQL FETCH statement such as:

FETCH CN for :N ROWS...

To change this default value, use the gateway command CHGORATUN. After displaying the panel for CHGORATUN, enter a new value for Array block size. Refer to "CHGORATUN, Change Initialization Parameters" for information about changing the setting for Array block size.

6.2.2 Data Conversion

The default coded character set identifier (system value QCCSID) for the AS/400 system is 65535. This CCSID value indicates to the gateway that character data in a column with such a CCSID is not to be converted and is to be treated as bit data.

The line entitled "Option for CCSID=65535 fields" on the "Change Oracle Gateways parameters" panel (use the CHGORATUN command) specifies how the gateway is to handle the "For Bit Data" and "CCSID=65535" fields. If the specification is *BITDATA, then the fields are treated as binary data and no translation occurs. If *CHARDATA is specified, then the fields are treated as if they were in the character set ID in which the gateway runs. When using the CHGORATUN command, the "User Profile CCSID" line specifies the character set ID in which the gateway runs. The ORARAW data area is used to hold the data conversion specification.

6.2.3 Read-Only Gateway

The gateway can be configured with read-only capabilities. The read-only option may provide improved performance and security, based on your configuration and parameter selections. The READONLY data area controls whether the gateway is enabled in this mode. The default setting for the read-only feature is *NO. You can change the value of this environment parameter using the CHGORATUN command.

If you enable the read-only feature by changing the setting to *YES, then only queries (SELECT statements) are allowed to DB2/400. The capabilities which control whether updates are allowed through the gateway are not enabled. These capabilities include insert, update, delete, and stored procedure support (pass through SQL, DB2/400 stored procedures, but not DB2/400 User Defined Functions). Statements attempting to modify records at the gateway site are rejected.

Oracle recommends that you do not routinely switch between settings of the read-only parameter. If you need both update and read-only functionality, then you should install two separate instances of the gateway with different read-only settings.

Refer to "CHGORATUN, Change Initialization Parameters" for information about changing the READONLY setting.