Contents

List of Tables

Title and Copyright Information

Preface

• Audience
• Documentation Accessibility
• Related Documentation
• Conventions

1 Introduction

• 1.1 Overview
• 1.2 Heterogeneous Services Technology
• 1.3 Oracle Database Gateways

2 Informix Gateway Features and Restrictions

• 2.1 Using the Pass-Through Feature
• 2.2 CHAR Semantics
• 2.3 Multi-byte Character Sets Ratio Suppression
• 2.4 IPv6 Support
• 2.5 Gateway Session IDLE Timeout
• 2.6 Database Compatibility Issues for Informix
  • 2.6.1 ANSI SQL Standard
  • 2.6.2 Naming Rules
    • 2.6.2.1 Rules for Naming Objects
    • 2.6.2.2 Object Names
    • 2.6.2.3 Case Sensitivity
  • 2.6.3 Data Types
    • 2.6.3.1 Binary, Byte and Text Literal Notation
    • 2.6.3.2 Data Type Conversion
  • 2.6.4 Queries
    • 2.6.4.1 Row Selection
    • 2.6.4.2 Empty Strings
    • 2.6.4.3 Empty Bind Variables
  • 2.6.5 Locking
• 2.7 Known Restrictions
  • 2.7.1 Transactional Integrity
  • 2.7.2 Transaction Capability
  • 2.7.3 COMMIT or ROLLBACK in PL/SQL Cursor Loops Closes Open Cursors
  • 2.7.4 Pass-Through Feature
  • 2.7.5 Informix SMALLFLOAT and REAL Data Types
  • 2.7.6 SQL Syntax
    • 2.7.6.1 WHERE CURRENT OF Clause
    • 2.7.6.2 CONNECT BY Clause
    • 2.7.6.3 Use of NULL Keyword in SELECT Statement
    • 2.7.6.4 Subqueries in INSERT Statement
    • 2.7.6.5 Subqueries in DELETE, INSERT, and UPDATE Statements
    • 2.7.6.6 ROWID
    • 2.7.6.7 EXPLAIN PLAN Statement
    • 2.7.6.8 Callback Support
  • 2.7.7 SQL*Plus
  • 2.7.8 Database Links
  • 2.7.9 Gateway Data Dictionary Views
  • 2.7.10 Stored Procedures
  • 2.7.11 CALLBACK links
• 2.8 Known Problems
  • 2.8.1 Encrypted Format Login
  • 2.8.2 Informix BYTE and TEXT Data Types
  • 2.8.3 Schema Names and PL/SQL
  • 2.8.4 Data Dictionary Views and PL/SQL

3 Case Studies

• 3.1 Case Descriptions
• 3.2 Distribution Media Contents
• 3.3 Demonstration Files
• 3.4 Demonstration Requirements
• 3.5 Creating Demonstration Tables
  • 3.5.1 Demonstration Table Definitions
  • 3.5.2 Demonstration Table Contents
• 3.6 Case 1: Simple Queries
• 3.7 Case 2: A More Complex Query
• 3.8 Case 3: Joining Informix Tables
• 3.9 Case 4: Write Capabilities
  • 3.9.1 DELETE Statement
  • 3.9.2 UPDATE Statement
  • 3.9.3 INSERT Statement
• 3.10 Case 5: Data Dictionary Query
• 3.11 Case 6: The Pass-Through Feature
  • 3.11.1 UPDATE Statement
  • 3.11.2 SELECT Statement

A Data Type Conversion

• A.1 Data Type Conversion

B Supported SQL Syntax and Functions

• B.1 Supported SQL Statements
  • B.1.1 DELETE
  • B.1.2 INSERT
  • B.1.3 SELECT
  • B.1.4 UPDATE
• B.2 Oracle Functions
  • B.2.1 Functions Not Supported by Informix
  • B.2.2 Functions Supported by Informix
    • B.2.2.1 Arithmetic Operators
    • B.2.2.2 Comparison Operators
    • B.2.2.3 Group Functions
    • B.2.2.4 String Functions
    • B.2.2.5 Pattern Matches
    • B.2.2.6 Date Functions
    • B.2.2.7 Other Functions
  • B.2.3 Functions Supported by the Gateway

C Data Dictionary

• C.1 Data Dictionary Support
  • C.1.1 Informix System Catalog Tables
  • C.1.2 Accessing the Gateway Data Dictionary
  • C.1.3 Direct Queries to Informix Tables
  • C.1.4 Supported Views and Tables
• C.2 Data Dictionary Mapping
  • C.2.1 Default Column Values
• C.3 Gateway Data Dictionary Descriptions

D Initialization Parameters

• D.1 Initialization Parameter File Syntax
• D.2 Oracle Database Gateway for Informix Initialization Parameters
• D.3 Initialization Parameter Description
  • D.3.1 HS_DB_DOMAIN
  • D.3.2 HS_DB_INTERNAL_NAME
  • D.3.3 HS_DB_NAME
  • D.3.4 HS_DESCRIBE_CACHE_HWM
  • D.3.5 HS_LANGUAGE
    • D.3.5.1 Character Sets
    • D.3.5.2 Language
    • D.3.5.3 Territory
  • D.3.6 HS_LONG_PIECE_TRANSFER_SIZE
  • D.3.7 HS_OPEN_CURSORS
  • D.3.8 HS_RPC_FETCH_REBLOCKING
  • D.3.9 HS_RPC_FETCH_SIZE
  • D.3.10 HS_TIME_ZONE
  • D.3.11 HS_TRANSACTION_MODEL
  • D.3.12 IFILE
  • D.3.13 HS_FDS_CONNECT_INFO
  • D.3.14 HS_FDS_RECOVERY_ACCOUNT
  • D.3.15 HS_FDS_RECOVERY_PWD
  • D.3.16 HS_FDS_TRACE_LEVEL
  • D.3.17 HS_FDS_TRANSACTION_LOG
  • D.3.18 HS_FDS_FETCH_ROWS
  • D.3.19 HS_IDLE_TIMEOUT
  • D.3.20 HS_NLS_LENGTH_SEMANTICS
  • D.3.21 HS_KEEP_REMOTE_COLUMN_SIZE
  • D.3.22 HS_FDS_REMOTE_DB_CHARSET
  • D.3.23 HS_FDS_SUPPORT_STATISTICS
  • D.3.24 HS_FDS_SQLLEN_INTERPRETATION

Index