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Oracle® Transparent Gateway for DRDA Installation and User's Guide
10g Release 2 (10.2) for UNIX

Part Number B16217-02
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D National Language Support

This appendix discusses the National Language Support (NLS) information for the Oracle Transparent Gateway for DRDA. This supplements the general Oracle NLS information found in the Oracle Database Application Developer's Guide - Fundamentals.

National Language Support enables Oracle applications to interact with users in their native language, using their conventions for displaying data. The Oracle NLS architecture is datadriven, enabling support for specific languages and character encoding schemes to be added without any changes in the source code.

There are a number of different settings in the gateway, DRDA Server, Oracle Database 10g, and client that affect NLS processing. For translations to take place correctly, character settings of these components must be compatible.

This appendix contains the following sections:

Overview of NLS Interactions

Figure D-1 illustrates NLS interactions within your computer, including each component of your computer and the parameters of each component that affect NLS processing in a distributed environment.

Figure D-1 Architecture of NLS Interactions with Your System Components

Description of Figure D-1 follows
Description of "Figure D-1 Architecture of NLS Interactions with Your System Components"

Table D-1 describes the architecture illustrated in Figure D-1.

The table discusses describes in detail the parameters and variables needed for NLS processing within each of your computer's environments: the client environment, the Oracle integrating server, the gateway and the DRDA Server.

Parameters Needed for NLS Processing in Your System's Environments 

Table D-1 Parameters Needed for NLS Processing in Your Systems Environments 

Environment Parameter or Variable Description

Client

NLS_LANG

It is environment variable. NLS_LANG sets the NLS environment used by the database both for the server session and for the client application. This ensures that the language environments of both the database and client application are automatically the same. Because NLS_LANG is an environment variable, it is read by the client applications at startup. The client communicates the information defined in NLS_LANG to the server when it connects. For detailed information, refer to "Client and Oracle Integrating Server Configuration".

Oracle integrating server

CHARACTER SET

This option is set during the creation of the database. CHARACTER SET determines the character encoding scheme used by the database and is defined at database creation in the CREATE DATABASE statement. All data columns of type CHAR, VARCHAR2, and LONG have their data stored in the database character set. For detailed information, refer to "Client and Oracle Integrating Server Configuration".

Oracle Transparent Gateway for DRDA


ORA_NLS10

It is environment variable. ORA_NLS10 determines where the gateway loads its character sets and other language data. For detailed information, refer to "Gateway Language Interaction with DRDA Server".

Oracle Transparent Gateway for DRDA


NLS_LANG

It is environment variable. NLS_LANG defines the character set used for communication between the gateway and the Oracle integrating server. For detailed information, refer to "Gateway Language Interaction with DRDA Server".

Oracle Transparent Gateway for DRDA


HS_LANGUAGE

It is initialization parameter. HS_LANGUAGE defines the character set used for communications between the gateway and the DRDA Server. For detailed information, refer to "Gateway Language Interaction with DRDA Server".

Oracle Transparent Gateway for DRDA


HS_NLS_NCHAR

It is initialization parameter. HS_NLS_NCHAR defines the NCHAR character set that is used for communications between the gateway and the DRDA Server. This parameter is required when the gateway accesses GRAPHIC or multi-byte data on the DRDA Server. Set this parameter to the same value as the character set component of the HS_LANGUAGE parameter. For detailed information, refer to "Gateway Language Interaction with DRDA Server".

Oracle Transparent Gateway for DRDA


HS_NLS_DATE_FORMAT

It is initialization parameter. HS_NLS_DATE_FORMAT specifies the format for dates used by the DRDA Server. For detailed information, refer to "Gateway Language Interaction with DRDA Server".

Oracle Transparent Gateway for DRDA


HS_NLS_DATE_LANGUAGE

It is initialization parameter. HS_NLS_DATE_LANGUAGE specifies the language used by the DRDA Server for day and month names, and for date abbreviations. For detailed information, refer to "Gateway Language Interaction with DRDA Server".

DRDA Server


CCSID

CCSID is the server character set that is mapped in the gateway to the equivalent Oracle Character Set. The CCSID specifies the character set that the DRDA database uses to store data. It is defined when you create a database. For detailed information, refer to "Gateway Codepage Map Facility".


Client and Oracle Integrating Server Configuration

A number of NLS parameters control NLS processing between the Oracle Database and client. You can set language-dependent behavior defaults for the server, as well as for the client that overrides these defaults. For a complete description of NLS parameters, refer to the NLS chapter in the Oracle Database Administrator's Guide. These parameters do not directly affect gateway processing. However, you must ensure that the client character set (which is specified by the Oracle Database server NLS_LANG environment variable) is compatible with the character sets that you specify on the gateway and on the DRDA Server.

When you create an Oracle Database, the character set that is used to store data is specified by the CHARACTER SET clause of the CREATE DATABASE statement. After the database is created, the database character set cannot be changed unless you re-create the database.

Normally, the default for CHARACTER SET is US7ASCII, which supports only the 26 Latin alphabetic characters. If you have specified 8-bit character sets on the gateway and the DRDA Server, then you must have a compatible 8-bit character set defined on your database. To check the character set of an existing database, issue the command:

SELECT USERENV('LANGUAGE') FROM DUAL;

For more information, refer to "Specifying Character Sets" in the Oracle Database Administrator's Guide.

Note that this does not mean that the gateway character set must be the same as the Oracle Database server character set. The Oracle Net facility performs implicit conversion between the Oracle Database character set and the gateway character set.

Gateway Language Interaction with DRDA Server

During logon of the gateway to the DRDA Server, initial language information is exchanged between the gateway and the server. First, the gateway sends to the DRDA Server the CCSID in which it will be conversing. In the following example, the Oracle Character Set WE8ISO8859P1 is mapped to CCSID 819 (an ASCII Code Page). This CCSID is sent to the DRDA Server. The DRDA Server responds with the CCSID in which it will be conversing. This will be the CCSID with which the DB2 database was generated. Also in the following example, this is CCSID 500, an EBCDIC Code Page. Figure D-2, "Gateway Language Interaction with DRDA Server", illustrates this process.

A DB2 instance maps unknown CCSIDs using the SYSIBM.SYSSTRINGS table. This table has different names for the various DB2 versions. It is possible to add additional character set mappings to this table by using DB2 utilities. Refer to the DB2 Installation documentation for details.

The setting of the HS_LANGUAGE parameter in the gateway initsid.ora determines which CCSID is used by the gateway for the conversation. Similarly, the setting of the HS_NLS_NCHAR parameter determines which CCSID is used by the gateway for GRAPHIC data interchange. For the list of supported ASCII-based Oracle Character Sets that are mapped to CCSIDs, refer to "Gateway Codepage Map Facility" .

Note that it is not necessary for the gateway character set to be the same as the Oracle Database server character set. In many cases, it is not feasible to set the gateway character set equal to the Oracle Database character set because the DRDA Server does not have a valid translation for it. Instead, choose a character set that haves the complete intersection with the character set that is used by the DRDA Server. The Oracle Net facility do as any translation between the gateway character set and the Oracle Database server character set.

Figure D-2 Gateway Language Interaction with DRDA Server

Description of Figure D-2 follows
Description of "Figure D-2 Gateway Language Interaction with DRDA Server"

Gateway Configuration

After the gateway is installed, there are several parameters that you must change to customize for NLS support.

NLS Parameters in the Gateway Initialization File

There are four parameters in the Gateway Initialization File, initsid.ora, which affect NLS:

  • HS_LANGUAGE

  • HS_NLS_NCHAR

  • HS_NLS_DATE_FORMAT

  • HS_NLS_DATE_LANGUAGE

HS_LANGUAGE

HS_LANGUAGE defines the character set that is used for communication between the gateway and the DRDA Server. It specifies the conventions, such as, the language used for messages from the target system, names of days and months, symbols for AD, BC, AM, and PM, and default language sorting mechanism.

The syntax of the HS_LANGUAGE parameter is:

HS_LANGUAGE=language[_territory.character_set] 

where:

language can be any valid language.

territory is optional, and defaults to AMERICA.

character_set is optional and defaults to US7ASCII. This must be an ASCII base character set name, and it should match a character set listed in the gateway codepage map. Refer to "Gateway Codepage Map Facility" for the list of supplied character set mappings.

If you omit the HS_LANGUAGE parameter from initsid.ora, then the default setting is AMERICAN_AMERICA.US7ASCII. EBCDIC character sets are not supported. The values for language and territory (such as AMERICAN_AMERICA) must be valid, but they have no effect on translations.

HS_NLS_NCHAR

HS_NLS_NCHAR specifies the character set that is used by the gateway to interchange GRAPHIC data. For correct compatibility, set it to the same character set name that is specified in the HS_LANGUAGE parameter. If it is set to a character set other than that specified in HS_LANGUAGE, or if it is omitted, then translation errors will occur.

HS_NLS_DATE_FORMAT

HS_NLS_DATE_FORMAT specifies the format for dates used by the DRDA Server.

The syntax of the NLS_DATE_FORMAT parameter is:

HS_NLS_DATE_FORMAT=date_format 

where date_format must be YYYY-MM-DD, the ISO date format. If this parameter is set to any other value or is omitted, then you receive an error when updating, deleting from, selecting from, or inserting into a table with date columns.

HS_NLS_DATE_LANGUAGE

HS_NLS_DATE_LANGUAGE specifies the language used by the DRDA Server for day and month names, and for date abbreviations. Because ISO date format contains numbers only, this parameter has no effect on gateway date processing and should be omitted.

Gateway Codepage Map Facility

The gateway has a user specifiable facility to map IBM Coded Character Set Identifiers (CCSIDs) to Oracle Character Sets for the purpose of data translation.

The default map name is codepage.map and is located in the $ORACLE_HOME/tg4drda/admin directory. Refer to Appendix C, "DRDA-Specific Parameters" for more detailed information about the DRDA_CODEPAGE_MAP parameter.

The map has two different forms of syntax. The first form of syntax defines a mapping between a CCSID and an Oracle Database Character Set:

[S|D|M] CCSID direction Oracle_CharacterSet {shift}

Where:

S designates a single-byte character set

D designates a double-byte character set

M designates a multi-byte character set

CCSID is the IBM coded character set identifier

direction is one of the following:

Oracle_CharacterSet is the name of a valid Oracle Character Set.

shift indicates a character set that requires Shift OUT/IN processing. Set this attribute only for EBCDIC-based double-byte and multi-byte mappings.

The second form of syntax defines a mapping of a multi-byte CCSID to its single-byte and double-byte CCSID equivalents:

MBC multi = single double

Where:

multi is the multi-byte CCSID

single is the single-byte CCSID

double is the double-byte CCSID

This facility is intended for mapping CCSIDs which were not previously mapped as shipped with the gateway. You must contact Oracle Support Services before modifying this map.

The following are the contents of the map as shipped with the Oracle Transparent Gateway for DRDA:

# Copyright (c) 2001, 2003, Oracle Corporation.  All rights reserved.
# Transparent gateway for IBM DRDA - CodePage/Oracle CharacterSet Map
# S==Single-byte, D==Double-byte, M==Multi-byte, MBC==SBC DBC mapping
#
# Single-byte codepage mappings
#
S    37 = WE8EBCDIC37   # United States/Canada                          EBCDIC
S   273 = D8EBCDIC273   # Austria/Germany                               EBCDIC
S   277 = DK8EBCDIC277  # Denmark/Norway                                EBCDIC
S   278 = S8EBCDIC278   # Finland/Sweden                                EBCDIC
S   280 = I8EBCDIC280   # Italy                                         EBCDIC
S   284 = WE8EBCDIC284  # Latin America/Spain                           EBCDIC
S   285 = WE8EBCDIC285  # United Kingdom                                EBCDIC
S   297 = F8EBCDIC297   # France                                        EBCDIC
#S   420 = AR8EBCDICX    # Arabic Bilingual (USA English)                EBCDIC
S   420 = AR8XBASIC     # Arabic Bilingual (USA English)                EBCDIC
S   424 = IW8EBCDIC424  # Israel (Hebrew)                               EBCDIC
S   437 = US8PC437      # Personal Computer,USA                         ASCII
S   500 = WE8EBCDIC500  # International                                 EBCDIC
S   813 = EL8ISO8859P7  # Greek                                         ASCII
S   819 = WE8ISO8859P1  # ISO/ANSI Multilingual                         ASCII
S   838 = TH8TISEBCDIC  # Thai w/Low-Tone Marks & Ancient Chars         EBCDIC
S   850 < US7ASCII      # Multilingual Page - Personal Computer         ASCII
S   850 = WE8PC850      # Multilingual Page - Personal Computer         ASCII
S   864 = AR8ISO8859P6  # Arabic - Personal Computer                    ASCII
S   870 = EE8EBCDIC870  # Latin 2, Multilingual/ROECE                   EBCDIC
S   871 = WE8EBCDIC871  # Iceland - CECP                                EBCDIC
S   875 = EL8EBCDIC875  # Greece                                        EBCDIC
S   904 > US7ASCII      # Traditional Chinese - PC-Data                 ASCII
S   912 = EE8ISO8859P2  # Latin 2 8-bit                                 ASCII
S   916 = IW8ISO8859P8  # Israel (Hebrew)                               ASCII
S  1025 = CL8EBCDIC1025 # Cyrillic, Multiling                           EBCDIC
S  1086 = IW8EBCDIC1086 # Israel                                        EBCDIC
S  1252 = WE8MSWIN1252  # Latin 1 - MS-Windows                          ASCII
S  1253 = EL8MSWIN1253  # Greek - MS-Windows                            ASCII
S 28709 > WE8EBCDIC37   # United States/Canada (CP28709==CP37)          EBCDIC
#
# Multi-byte codepage mappings
#
#S   833 > KO16DBCS       # Korean Extended single-byte                  EBCDIC
#D   834 > KO16DBCS shift # Korean double-byte                           EBCDIC
#M   933 = KO16DBCS shift # Korean Mixed multi-byte                      EBCDIC

#MBC 933 = 833 834        # Korean Mixed multi-byte                      EBCDIC
#
#S  1088 > KO16MSWIN949 # Korean KS single-byte PC-Data                  ASCII
#D   951 > KO16MSWIN949 # Korean KS double-byte PC-Data                  ASCII
#M   949 = KO16MSWIN949 # Korean KS multi-byte PC-Data                   ASCII
#MBC 949 = 1088 951     # Korean KS multi-byte PC-Data                   ASCII
#
#S   891 > KO16KSC5601 # Korean single-byte                              ASCII
#S  1040 > KO16KSC5601 # Korean single-byte                              ASCII
#D   926 > KO16KSC5601 # Korean double-byte                              ASCII
#M   934 = KO16KSC5601 # Korean multi-byte                               ASCII
#M   944 > KO16KSC5601 # Korean multi-byte                               ASCII
#MBC 934 = 891 926     # Korean multi-byte                               ASCII
#MBC 944 = 1040 926    # Korean multi-byte Extended                      ASCII
#
#S 28709 > ZHT16DBCS       # Traditional Chinese single-byte             EBCDIC
#D   835 > ZHT16DBCS shift # Traditional Chinese double-byte             EBCDIC
#M   937 = ZHT16DBCS shift # Traditional Chinese multi-byte              EBCDIC
#MBC 937 = 28709 835       # Traditional Chinese multi-byte              EBCDIC
#
#S  1114 > ZHT16MSWIN950 # Traditional Chinese single-byte               ASCII
#D   947 > ZHT16MSWIN950 # Traditional Chinese double-byte               ASCII
#M   950 = ZHT16MSWIN950 # Traditional Chinese multi-byte                ASCII
#MBC 950 = 1114 947      # Traditional Chinese multi-byte                ASCII
#

#S   836 > ZHS16DBCS       # Simplified Chinese single-byte              EBCDIC
#D   837 > ZHS16DBCS shift # Simplified Chinese double-byte              EBCDIC
#M   935 = ZHS16DBCS shift # Simplified Chinese multi-byte               EBCDIC
#MBC 935 = 836 837         # Simplified Chinese multi-byte               EBCDIC
#
#S  1027 > JA16DBCS       # Japanese single-byte                         EBCDIC
#D   300 > JA16DBCS shift # Japanese double-byte                         EBCDIC
#D  4396 > JA16DBCS shift # Japanese double-byte                         EBCDIC
#M   939 = JA16DBCS shift # Japanese multi-byte                          EBCDIC
#M  5035 > JA16DBCS shift # Japanese multi-byte                          EBCDIC
#MBC  939 = 1027 300      # Japanese multi-byte                          EBCDIC
#MBC 5035 = 1027 4396     # Japanese multi-byte                          EBCDIC
#
#S   290 > JA16EBCDIC930       # Japanese single-byte                    EBCDIC
#D   300 > JA16EBCDIC930 shift # Japanese double-byte                    EBCDIC
#D  4396 > JA16EBCDIC930 shift # Japanese double-byte                    EBCDIC
#M   930 = JA16EBCDIC930 shift # Japanese multi-byte                     EBCDIC
#M  5026 > JA16EBCDIC930 shift # Japanese multi-byte                     EBCDIC
#MBC  930 = 290 300            # Japanese multi-byte                     EBCDIC
#MBC 5026 = 290 4396           # Japanese multi-byte                     EBCDIC
#

Refer to the following list to check the character set of an existing database:

Multi-Byte and Double-Byte Support in the Gateway

To enable the gateway to properly handle double-byte and multi-byte data, you must configure the codepage map facility with proper multi-byte maps, and (as an option) can set the following gateway configuration parameters:

Refer to Appendix C, "DRDA-Specific Parameters", for the values of these parameters.

Configuring the codepage map requires knowledge of the codepages that have been configured in the DRDA Server database as well as knowledge of compatible Oracle Database Character Sets.

IBM coded character set identifiers (CCSIDs) are used to indicate which codepage is configured as the primary codepage for the database, as well as any translation character sets loaded into the database. Some DRDA Servers, such as with DB2, have a translation facility in which character set transforms are mapped between two compatible character sets. For DB2/OS390, these transforms are stored in the table SYSIBM.SYSSTRINGS and transform on the CCSID codepage to another CCSID codepage. In SYSSTRINGS, IN and OUT columns specify the CCSIDs that are used in the transform. Typical transforms are from ASCII to EBCDIC and back. Two transforms are therefore used for two given CCSIDs.

Multi-byte codepages comprise a single-byte codepage and a double-byte codepage. For example, the Korean EBCDIC multi-byte codepage, CCSID 933, is composed of two codepages: codepage 833 (for single-byte) and codepage 834 (for double-byte). The DRDA Server, therefore, can send data to the gateway in any of these three codepages, and the gateway must translate appropriately depending upon which codepage the data is associated with. Because CCSID 933 is an EBCDIC-based codepage, and the gateway must use an ASCII-based codepage, we identify an equivalent set of codepages, which are ASCII-based. For example the Korean multi-byte codepage, CCSID 949, which is composed of two codepages: codepage 1088 (for single-byte) and codepage 951 (for double-byte).

The codepage map facility is used to map these CCSIDs into the equivalent Oracle Database Character Sets. Unlike IBM CCSIDs, Oracle Database Character Sets are unified (in that single-byte and double-byte character sets have been combined into one set) and are identified by one ID instead of three IDs. In our previous example, the equivalent Oracle Database Character Set for the ASCII Korean codepages would be KO16MSWIN949, and the EBCDIC Korean codepages would be KO16DBCS. These are identified to the gateway by using a set of mapping entries in the codepage.map file.

The EBCDIC Korean sets are:

S   833 > KO16DBCS       # Korean Extended single-byte                  EBCDIC
D   834 > KO16DBCS shift # Korean double-byte                           EBCDIC
M   933 = KO16DBCS shift # Korean Mixed multi-byte                      EBCDIC
MBC 933 = 833 834        # Korean Mixed multi-byte                      EBCDIC

Notice that the multi-byte set is a bidirectional map to KO16DBCS. However the single and double codepages are mapped one-way to KO16DBCS. Because only one bidirectional CCSID to Oracle Database Character Set entry for a given pair can exist, you directly map the multi-byte sets. Because the single-byte and double-byte CCSIDs are ostensibly subsets of KO16DBCS, you map them as one-way entries. Note that double-byte and multi-byte maps are tagged with the shift attribute. This is required for EBCDIC double-byte and multi-byte codepages as part of the shift out/in encapsulation of data. The single-byte map is not marked because single-byte sets are not permitted to contain double-byte data and thus will never use shift encapsulation. Note that the MBC entry ties the codepages together.

The ASCII Korean sets are similarly mapped and are:

S  1088 > KO16MSWIN949 # Korean KS single-byte PC-Data                  ASCII
D   951 > KO16MSWIN949 # Korean KS double-byte PC-Data                  ASCII
M   949 = KO16MSWIN949 # Korean KS multi-byte PC-Data                   ASCII
MBC 949 = 1088 951     # Korean KS multi-byte PC-Data                   ASCII

Notice that the multi-byte set is a bidirectional map to KO16MSWIN949. However the single and double codepages are mapped one-way to KO16MSWIN949. Because only one bidirectional CCSID to Oracle Database Character Set entry for a given pair can exist, we directly map the multi-byte sets. And because the single-byte and double-byte CCSIDs are ostensibly subsets of KO16MSWIN949, we map them as one-way entries. Note that there is no "shift" attribute in any of these mappings. This is because ASCII-based sets do not use shift out/in encapsulation. Instead, ASCII-based sets use a different method (which does not use a shift out/in protocol) to identify double-byte characters.

The above entries supply the necessary codepage mappings for the gateway. To complete the example, we need to specify the correct character set in the HS_LANGUAGE and HS_NLS_NCHAR parameters in the Gateway Initialization file. The Gateway Initialization parameters would look as follows:

HS_LANGUAGE=AMERICAN_AMERICA.KO16MSWIN949
HS_NLS_NCHAR=KO16MSWIN949

Note that the specified character set must be ASCII-based.

This takes care of the configuration of the gateway. The last step is to set up transforms between the EBCDIC codepages and the ASCII codepages in the DRDA Server database. Normally, the gateway would use a total of six transforms, one of each pair in both directions. You may save some table space by installing only the ASCII-to-EBCDIC transforms, because the DRDA Server needs to translate only the ASCII data that is sent by the gateway, but the DRDA Server does not need to send ASCII data. The gateway will receives the EBCDIC data and translate as needed. This one-sided data transfer methodology is called receiver-makes-right, meaning that the receiver must translate whatever character set the sender uses. In our example, the DRDA Server is EBCDIC-based, so it will send all data in EBCDIC. The server, therefore, does not need to have an EBCDIC-to-ASCII transform because the server never use the transform.

In our previous example, the DRDA Server database is assumed to be EBCDIC, which is likely to be true for a DB2/OS390 database. For a DB2/UDB database, however, this is not likely to be true. Because most DB2/UDB databases run on ASCII-based computers, they will likely be created with ASCII-based codepages. In such cases, the gateway needs to have only one set of codepage map definitions, which are for the ASCII set. Also, because both the DRDA Server and the gateway will be using the same codepages, no character set transforms need to be loaded into the DB2 database. This can help reduce the amount of CPU overhead that is associated with character translation.

Be aware that some multi-byte codepages may be composed of single-byte CCSIDs that are already defined in the codepage.map file that is provided with the product. If you are adding a new set of entries to support a multi-byte set, then comment out the provided entries so that your new entries will be used correctly.

Additional codepage mappings, which are not already provided, are possible. You may construct entries such as those in our examples, given knowledge of the IBM CCSIDs and the Oracle Database Character Sets. Because this can be complex and quite confusing (given the IBM documentation of codepage definitions and Oracle Database Character Set definitions), please thoroughly test your definitions for all desired character data values before putting them into production.

If you are uncertain, then contact Oracle Support Services to request proper codepage mapping entries.

Message Availability

Whether a language message module is available depends on which modules are installed in the Oracle product set that is running on the server. If message modules for a particular language set are not installed, then specifying that language with a language parameter does not display messages in the requested language.

Example of NLS Configuration

Following is an example of all the settings that are needed to configure the gateway, DRDA Server, Oracle Database, and client so that a language and character set are working compatibly across the system. In this example, the settings enable a customer in Germany to interact with the gateway in German:

gateway initsid.ora file:

HS_LANGUAGE=AMERICAN_AMERICA.WE8ISO8859P1
HS_NLS_DATE_FORMAT=YYYY-MM-DD

DRDA Server CCSID:

273 (D8EBCDIC273)

Oracle Database server and Client Setting for Database:

SELECT USERENV('language') FROM DUAL;
USERENV('LANGUAGE')
-----------------------------
AMERICAN_AMERICA.WE8ISO8859P1

Oracle Database server and Client Environment Variables:

NLS_LANG=GERMAN_GERMANY.WE8ISO8859P1