Contents

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Preface

1 Introduction

Overview

Heterogeneous Services Technology

Oracle Transparent Gateways

2 Configuring the Gateway

Configuring the Gateway

Task 1: Choose a System Identifier for the Gateway

Task 2: Customize the Gateway Startup File

Task 3: Customize the Initialization Parameter File

Configuring Oracle Net Services Listener for the Gateway

Task 1: Configure Oracle Net Services TNS Listener for the Gateway

Example of Address to Listen On in listener.ora File

Example of Gateway to Start in listener.ora File

Task 2: Stop and Start the TNS Listener for the Gateway

Configuring the Oracle Database Server for Gateway Access

Configuring Oracle Oracle Net Services for the Oracle Database Server

Configuring tnsnames.ora

Creating Database Links

Configuring the Gateway for Multiple Rdb Databases

Multiple Databases Example: Configuring the Gateway

Multiple Databases Example: Configuring Oracle Oracle Net Services Listener

Multiple Databases Example: Stopping and Starting the TNS Listener

Multiple Databases Example: Configuring the Oracle Database Server for Gateway Access

Configuring Oracle Net Services on the Oracle Database Server for Multiple Gateway Instances

Multiple Databases Example: Accessing Rdb Data

Performing Configuration Tasks

Configuring for Two-Phase Commit

Create the Transaction Log Table

3 Rdb Gateway Features and Restrictions

Using the Pass-Through Feature

Database Compatibility Issues for Rdb

Handling Dates

Queries

Empty Strings

Empty Bind Variables

Constraint Handling

Known Restrictions

Transactional Integrity

Transaction Capability

COMMIT or ROLLBACK in Cursor PL/SQL Loops Closes Open Cursors

Pass-Through Feature

Multi-Schema Rdb Databases

Subqueries in UPDATE Statement

ROWID

Table and View Names

Column Names

Unsupported Data Types

Database Links

Stored Procedures

Known Problems

Encrypted Format Login

Data Definition Language Statements

Date and Time Issues

4 Case Studies

Case Descriptions

CD-ROM Contents

Demonstration Files

Demonstration Requirements

Creating Demonstration Tables

Demonstration Table Definitions

Demonstration Table Contents

Case 1: Simple Queries

Case 2: A More Complex Query

Case 3: Joining Rdb Tables

Case 4: Write Capabilities

DELETE Statement

UPDATE Statement

INSERT Statement

Case 5: Data Dictionary Query

Case 6: The Pass-Through Feature

UPDATE Statement

SELECT Statement

A Data Type Conversion

Data Type Conversion

B Supported SQL Syntax and Functions

Supported SQL Statements

DELETE

INSERT

SELECT

UPDATE

Oracle Functions

Functions Not Supported by Rdb

Functions Supported by Rdb

Arithmetic Operators

Comparison Operators

String Functions

Group Functions

Pattern Matches

Date Functions

Other Functions

Functions Supported by the Gateway

C Data Dictionary

Data Dictionary Support

Rdb System Catalog Tables

Accessing the Gateway Data Dictionary

Direct Queries to Rdb Tables

Supported Views and Tables

Data Dictionary Mapping

Default Column Values

Gateway Data Dictionary Descriptions

D Heterogeneous Services Initialization Parameters

Initialization Parameter File Syntax

HS_FDS_CONNECT_INFO

HS_FDS_TRACE_LEVEL

HS_FDS_TRANSACTION_MODEL