14 Migration From Existing Gateways

14.1.1 Step 1: Install the New Release

Install the new release of the gateway in a separate directory as outlined in Chapter 4, "Installing the Gateway".

14.1.2 Step 2: Transferring the initsid.ora Gateway Initialization File Parameters

Copy the initsid.ora file from the old gateway instance to the new instance.

If you are migrating from Release 9.0.1 or earlier of the gateway, PGA_TRACE is not supported. You need to modify the parameter to TRACE_LEVEL instead.

If you have encrypted some of the parameters at file initsid.ora by using dg4pwd, copy the $ORACLE_HOMRE/dg4appc/admin/initsid.pwd file from the old gateway instance to the new instance.

14.1.3 Backout Considerations When Migrating to New Releases

Oracle recommends that you keep the old gateway Oracle home directory and instance configurations intact and operational when you are installing a new release of the gateway and upgrading existing instances, in case there are problems with the upgrade. This helps to ensure minimum down time between changes to different gateway instances.

14.1.4 Oracle Net Considerations

Oracle Database Gateway for APPC uses the Heterogeneous Services (HS) facilities of Oracle and Oracle Net. If you are upgrading from a version 4 gateway, then you need to slightly modify the gateway service name entries in the tnsnames.ora file. Add an (HS=) clause to tell Oracle Net that the gateway uses HS facilities. For more information, refer to Section 5.1, "Configuring the Oracle Network for the Gateway".

14.1.5 Parameter Changes: Version 4 to Release 11.2 of the Gateway

This release of Oracle Database Gateway for APPC introduces new and changed initialization parameters if you are migrating from a Version 4 gateway to Release 11.2 of the gateway.

If you are using the gateway TCP/IP support for IMS Connect, you will not be migrating from Version 4 to the current release of the gateway. However, you need to place valid Heterogeneous Services parameters into your initsid.ora file.

This chapter contains references to the particular HS parameters that you need to run the gateway.

New Gateway Initialization Parameters

The following parameters are in the gateway initialization file (initsid.ora):

• FDS_CLASS

• FDS_INSTANCE

• HS_FDS_FETCH_ROWS

• LOG_DESTINATION

• TRACE_LEVEL

• PGA_TCP_DB (TCP/IP only)

• PGA_TCP_USER (TCP/IP only)

• PGA_TCP_PASS (TCP/IP only)

  Note:

  The HS_ parameters are specific to Oracle Heterogeneous Services. For details on HS parameters, refer to the Oracle Database Heterogeneous Connectivity User's Guide.

Renamed Gateway Initialization File Parameters

Following is a list of the gateway initialization file (initsid.ora) parameters that have been renamed in this release of the gateway. The former names of the parameters are shown in parentheses.

• HS_COMMIT_STRENGTH_POINT (formerly COMMIT_STRENGTH_POINT)

• HS_DB_DOMAIN (formerly DB_DOMAIN)

• HS_DB_INTERNAL_NAME (formerly DB_INTERNAL_NAME)

• HS_DB_NAME (formerly DB_NAME)

• HS_DESCRIBE_CACHE_HWM (formerly DESCRIBE_CACHE_HWM)

• HS_LANGUAGE (formerly LANGUAGE)

• HS_NLS_DATE_FORMAT (formerly NLS_DATE_FORMAT)

• HS_NLS_DATE_LANGUAGE (formerly NLS_DATE_LANGUAGE)

• HS_OPEN_CURSORS (formerly OPEN_CURSORS)

• HS_ROWID_CACHE_SIZE (formerly ROWID_CACHE_SIZE)

Obsolete Parameters

The following parameters are obsolete. If necessary, remove them from your configuration files:

• MODE

• SERVER_PATH

• ERROR_LOGGING

• ERROR_REPORTING

• ERRORTAG

• GATEWAY_SID

• GROUP_BY_OFF

• GTWDEBUG

• INCREMENT_CURSORS

• INIT_CURSORS

• LIST

• MAX_LOG_SIZE

• OPTIMIZE_FILE_OPEN

• ORDER_BY_OFF

• RESOLVE_BINDS

• RETRY

• SET

• SNMP_SUPPORT

• SQL_TRACE

• TRIM_CURSORS

• D_OPEN_CURSORS

• D_INIT_CURSORS

• D_INCREMENT_CURSORS

• D_TRIM_CURSORS

• PGA_TRACE

14.1.6 Parameter Changes: Version 8 or Earlier to Gateway Release 11.2

The following startup shell script parameter must be added to initsid.ora if you are migrating from a Version 4 or Version 8 gateway to Release 11.2 of the Oracle Database Gateway for APPC:

• FDS_CLASS_VERSION

14.1.7 Migrating from Gateway Release 9.0.1 or 9.2.0 or 10.1.0 to Gateway Release 11.2

No new parameters were added between release 9.0.1 and this release of the gateway.

14.2.1 Using Existing TIPs with Existing Side Profile Definitions

Follow these instructions:

1. Make sure you have used the pg4tcpmap tool to insert valid parameter values into the PGA_TCP_IMSC table.

   Refer to Chapter 12, "Gateway Configuration Using TCP/IP Communication Protocol" for instructions to load the PGA_TCP_IMSC table.

2. Make sure the LANGUAGE parameter in your TIPs is set to american_america_us7ascii.

3. Use PGAU to regenerate the IMS TIPs.

4. Add the following new TCP/IP parameters to the initsid.ora file:

   • PGA_TCP_DB

   • PGA_TCP_USER

   • PGA_TCP_PASS

   You will find descriptions and information about adding these parameters in Section 14.1.5, "Parameter Changes: Version 4 to Release 11.2 of the Gateway". You will also find descriptions of the parameters in Appendix B, "Gateway Initialization Parameters for TCP/IP Communication Protocol".

   Note:

   If your TIPs from a previous version of the gateway were already defined using a SideProfileName and the NLS_ LANGUAGE parameter has been set to a value of american_america_us7ascii, then you will not need to recompile these TIPs. You still need to map your parameter values using the pg4tcpmap tool.

   Note:

   TIPs must be recompiled when changing communication protocol from SNA to TCP/IP.

   If you have existing TIPs that were generated previously on a gateway using the SNA communication package protocol, and you want to use the new TCP/IP feature, then the TIPs have to be regenerated by PGAU with mandatory NLS_LANGUAGE and Side Profile Settings. Specify the appropriate ASCII character set in the DEFINE TRANSACTION command.

   This is because the gateway assumes that the appropriate user exit in IMS Connect is being used, which would translate between the appropriate ASCII and EBCDIC character sets.