Contents

Title and Copyright Information

List of Tables

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Preface

Audience

Organization

Related Documentation

Conventions

Documentation Accessibility

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 Initialization Parameter File

Configuring Oracle Net Services Listener for the Gateway

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

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

Creating Database Links

Configuring the Gateway for Multiple Informix Databases

Multiple Databases Example: Configuring the Gateway

Multiple Databases Example: Configuring the Informix Environment

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

Multiple Databases Example: Accessing Informix Data

Performing Configuration Tasks

Configuring for Two-Phase Commit

3 Informix Gateway Features and Restrictions

Using the Pass-Through Feature

Database Compatibility Issues for Informix

ANSI SQL Standard

Naming Rules

Data Types

Queries

Locking

Known Restrictions

Transactional Integrity

Transaction Capability

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

ROWID Restrictions

Pass-Through Feature

Informix SMALLFLOAT and REAL Data Types

Informix INTERVAL, NCHAR and NVARCHAR Data Types

SQL Syntax

SQL*Plus

Database Links

Stored Procedures

Known Problems

Encrypted Format Login

Aggregate Function with CREATE TABLE or CREATE VIEW Statement

Informix BYTE and TEXT Data Types

Schema Names and PL/SQL

Data Dictionary Views and PL/SQL

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 Informix 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 Informix

Functions Supported by Informix

Functions Supported by the Gateway

C Data Dictionary

Data Dictionary Support

Informix System Catalog Tables

Accessing the Gateway Data Dictionary

Direct Queries to Informix 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_RECOVERY_ACCOUNT

HS_FDS_RECOVERY_PWD

HS_FDS_TRACE_LEVEL

HS_FDS_TRANSACTION_MODEL

Index