Oracle® Database Gateway for ODBC

User's Guide

11g Release 1 (11.1)

E10311-03

August 2008

Oracle Database Gateway for ODBC User's Guide, 11g Release 1 (11.1)

E10311-03

Copyright © 2007, 2008, Oracle. All rights reserved.

Primary Author:  Maitreyee Chaliha

Contributor:  Vira Goorah, Juan Pablo Ahues-Vasquez, Peter Castro, Charles Benet, Peter Wong, and Govind Lakkoju

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Contents

List of Figures

List of Tables

Preface

- Audience

- Documentation Accessibility

- Related Documents

- Conventions

1 Introduction

- 1.1 Overview

- 1.2 Heterogeneous Services Technology

- 1.3 Oracle Database Gateway for ODBC

- 1.4 Oracle Database Gateway for ODBC Architecture

- 1.4.1 Oracle and Non-Oracle Systems on Separate Machines

- 1.4.2 Oracle and Non-Oracle Systems on the Same Machine

- 1.5 ODBC Connectivity Requirements

2 Oracle Database Gateway for ODBC Features and Restrictions

- 2.1 Using the Pass-Through Feature

- 2.2 Known Restrictions

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

- 2.2.2 SQL Syntax

- 2.2.2.1 WHERE CURRENT OF Clause

- 2.2.2.2 CONNECT BY Clause

- 2.2.2.3 ROWID

- 2.2.2.4 EXPLAIN PLAN Statement

- 2.3 Known Problems

- 2.3.1 Encrypted Format Login

- 2.3.2 Date Arithmetic

A Data Type Conversion

- A.1 Mapping ODBC Data Types to Oracle Data Types

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

C Data Dictionary

- C.1 Accessing the Non-Oracle Data Dictionary

- C.2 Views and Tables Supported by Oracle Database Gateway for ODBC

- C.2.1 Data Dictionary Mapping

- C.2.2 Oracle Database Gateway for ODBC Data Dictionary Descriptions

D Initialization Parameters

- D.1 Initialization Parameter File Syntax

- D.2 Oracle Database Gateway for ODBC 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_DEFAULT_OWNER

- D.3.15 HS_FDS_TRACE_LEVEL

- D.3.16 HS_FDS_SHAREABLE_NAME

- D.3.17 HS_FDS_FETCH_ROWS

Index

List of Figures

- 1-1 Oracle and Non-Oracle Systems on a Separate Machines

- 1-2 Oracle and Non-Oracle Systems on the Same Machine

List of Tables

- A-1 Mapping ODBC Data Types to Oracle Data Types

- C-1 Oracle Database Gateway for ODBC Data Dictionary Mapping

- C-2 ALL_CATALOG

- C-3 ALL_COL_COMMENTS

- C-4 ALL_CONS_COLUMNS

- C-5 ALL_CONSTRAINTS

- C-6 ALL_IND_COLUMNS

- C-7 ALL_INDEXES

- C-8 ALL_OBJECTS

- C-9 ALL_TAB_COLUMNS

- C-10 ALL_TAB_COMMENTS

- C-11 ALL_TABLES

- C-12 ALL_USERS

- C-13 ALL_VIEWS

- C-14 DICTIONARY

- C-15 DICT_COLUMNS

- C-16 USER_CATALOG

- C-17 USER_COL_COMMENTS

- C-18 USER_CONS_COLUMNS

- C-19 USER_CONSTRAINTS

- C-20 USER_IND_COLUMNS

- C-21 USER_INDEXES

- C-22 USER_OBJECTS

- C-23 USER_TABCOLUMNS

- C-24 USER_TAB_COMMENTS

- C-25 USER_TABLES

- C-26 USER_USERS

- C-27 USER_VIEWS

Preface

This manual describes the Oracle Database Gateway for ODBC, which enables Oracle client applications to access non-Oracle systems data through Structured Query Language (SQL). The gateway, with the Oracle database, creates the appearance that all data resides on a local Oracle database, even though the data can be widely distributed.

This preface covers the following topics:

- Audience

- Documentation Accessibility

- Related Documents

- Conventions

Audience

This manual is intended for Oracle database administrators who perform the following tasks:

- Installing and configuring the Oracle Database Gateway for ODBC

- Diagnosing gateway errors

- Using the gateway to access non-Oracle system data

Note:
You should understand the fundamentals of Oracle Database Gateways and the UNIX based platform before using this guide to install or administer the gateway.

Documentation Accessibility

Our goal is to make Oracle products, services, and supporting documentation accessible, with good usability, to the disabled community. To that end, our documentation includes features that make information available to users of assistive technology. This documentation is available in HTML format, and contains markup to facilitate access by the disabled community. Accessibility standards will continue to evolve over time, and Oracle is actively engaged with other market-leading technology vendors to address technical obstacles so that our documentation can be accessible to all of our customers. For more information, visit the Oracle Accessibility Program Web site at

http://www.oracle.com/accessibility/

Accessibility of Code Examples in Documentation

Screen readers may not always correctly read the code examples in this document. The conventions for writing code require that closing braces should appear on an otherwise empty line; however, some screen readers may not always read a line of text that consists solely of a bracket or brace.

Accessibility of Links to External Web Sites in Documentation

This documentation may contain links to Web sites of other companies or organizations that Oracle does not own or control. Oracle neither evaluates nor makes any representations regarding the accessibility of these Web sites.

TTY Access to Oracle Support Services

Oracle provides dedicated Text Telephone (TTY) access to Oracle Support Services within the United States of America 24 hours a day, 7 days a week. For TTY support, call 800.446.2398. Outside the United States, call +1.407.458.2479.

Related Documents

For more information, see the following documents:

- Oracle Database New Features Guide

- Oracle Call Interface Programmer's Guide

- Oracle Database Administrator's Guide

- Oracle Database Advanced Application Developer's Guide

- Oracle Database Concepts

- Oracle Database Performance Tuning Guide

- Oracle Database Error Messages

- Oracle Database Globalization Support Guide

- Oracle Database Reference

- Oracle Database SQL Language Reference

- Oracle Database Net Services Administrator's Guide

- SQL*Plus User's Guide and Reference

- Oracle Database Heterogeneous Connectivity Administrator's Guide

- Oracle Database Security Guide

Many of the examples in this book use the sample schemas of the seed database, which is installed by default when you install Oracle. Refer to Oracle Database Sample Schemas for information on how these schemas were created and how you can use them yourself.

Conventions

The following text conventions are used in this document:

Convention

Meaning

boldface

Boldface type indicates graphical user interface elements associated with an action, or terms defined in text or the glossary.

italic

Italic type indicates book titles, emphasis, or placeholder variables for which you supply particular values.

monospace

Monospace type indicates commands within a paragraph, URLs, code in examples, text that appears on the screen, or text that you enter.

1 Introduction

This chapter introduces the challenge faced by organizations when running several different database systems. It briefly covers Heterogeneous Services, the technology that the Oracle Database Gateway for ODBC is based on.

To get a good understanding of generic gateway technology, Heterogeneous Services, and how Oracle Database Gateways fit in the picture, reading the Oracle Database Heterogeneous Connectivity Administrator's Guide first is highly recommended.

This chapter contains the following sections:

- Overview

- Heterogeneous Services Technology

- Oracle Database Gateway for ODBC

- Oracle Database Gateway for ODBC Architecture

- ODBC Connectivity Requirements

1.1 Overview

Heterogeneous data access is a problem that affects a lot of companies. A lot of companies run several different database systems. Each of these systems stores data and has a set of applications that run against it. Consolidation of this data in one database system is often hard - in large part because many of the applications that run against one database may not have an equivalent that runs against another. Until such time as migration to one consolidated database system is made feasible, it is necessary for the various heterogeneous database systems to interoperate.

Oracle Database Gateways provide the ability to transparently access data residing in a non-Oracle system from an Oracle environment. This transparency eliminates the need for application developers to customize their applications to access data from different non-Oracle systems, thus decreasing development efforts and increasing the mobility of the application. Applications can be developed using a consistent Oracle interface for both Oracle and non-Oracle systems.

Gateway technology is composed of two parts: a component that has the generic technology to connect to a non-Oracle system, which is common to all the non-Oracle systems, called Heterogeneous Services, and a component that is specific to the non-Oracle system that the gateway connects to. Heterogeneous Services, in conjunction with the Oracle Database Gateways, enable transparent access to non-Oracle systems from an Oracle environment.

1.2 Heterogeneous Services Technology

Heterogeneous Services provides the generic technology for connecting to non-Oracle systems. As an integrated component of the database, Heterogeneous Services can exploit features of the database, such as the powerful SQL parsing and distributed optimization capabilities.

Heterogeneous Services extend the Oracle SQL engine to recognize the SQL and procedural capabilities of the remote non-Oracle system and the mappings required to obtain necessary data dictionary information. Heterogeneous Services provides two types of translations: the ability to translate Oracle SQL into the proper dialect of the non-Oracle system as well as data dictionary translations which displays the metadata of the non-Oracle system in the local format. For situations where no translations are available, native SQL can be issued to the non-Oracle system using the pass-through feature of Heterogeneous Services.

Heterogeneous Services also maintains the transaction coordination between Oracle and the remote non-Oracle system.

See Also:
Oracle Database Heterogeneous Connectivity Administrator's Guide for more information about Heterogeneous Services.

1.3 Oracle Database Gateway for ODBC

Oracle Database Gateway for ODBC is intended for low-end data integration solutions requiring the dynamic query capability to connect from an Oracle database to non-Oracle systems. Any data source compatible with the ODBC standards described in this chapter can be accessed using Oracle Database Gateway for ODBC.

The capabilities, SQL mappings, data type conversions, and interface to the remote non-Oracle system are contained in the gateway. The gateway interacts with Heterogeneous Services to provide the transparent connectivity between Oracle and non-Oracle systems.

1.4 Oracle Database Gateway for ODBC Architecture

To access the non-Oracle data store using Oracle Database Gateway for ODBC, the gateway works with an ODBC driver. The driver that you use must be on the same machine as the gateway. The non-Oracle system can reside on the same machine as the Oracle database or on a different machine.

The gateway can be installed on the machine running the non-Oracle system, the machine running the Oracle database or on a third machine as a standalone. Each configuration has its advantages and disadvantages. The issues to consider when determining where to install the gateway are network traffic, operating system platform availability, hardware resources and storage.

Note:
The ODBC driver may require non-Oracle client libraries even if the non-Oracle database is located on the same machine. Refer to your ODBC driver documentation for information about the requirements for the ODBC driver.

1.4.1 Oracle and Non-Oracle Systems on Separate Machines

Figure 1-1 shows an example of a configuration in which an Oracle and non-Oracle database are on separate machines, communicating through Oracle Database Gateway for ODBC. The client connects to the non-Oracle system through a network.

Figure 1-1 Oracle and Non-Oracle Systems on a Separate Machines

In this configuration:

1. A client connects to the Oracle database through Oracle Net.

2. The Heterogeneous Services component of the Oracle database connects through Oracle Net to the gateway.

3. The gateway communicates with the following non-Oracle components:

- An ODBC driver manager

- An ODBC driver

4. Each user session receives its own dedicated agent process spawned by the first use in that user session of the database link to the non-Oracle system. The agent process ends when the user session ends.

Note:
The ODBC driver may require non-Oracle client libraries even if the non-Oracle database is located on the same machine. Refer to your ODBC driver documentation for information about the requirements for the ODBC driver.

1.4.2 Oracle and Non-Oracle Systems on the Same Machine

Figure 1-2 shows an example of a configuration in which an Oracle and non-Oracle database are on the same machine, again communicating through Oracle Database Gateway for ODBC.

Figure 1-2 Oracle and Non-Oracle Systems on the Same Machine

In this configuration:

1. A client connects to the Oracle database through Oracle Net.

2. The Heterogeneous Services component of the Oracle database connects through Oracle Net to the gateway

3. The agent communicates with the following non-Oracle components:

- An ODBC driver manager

- An ODBC driver

The driver then allows access to the non-Oracle data store.

4. Each user session receives its own dedicated agent process spawned by the first use in that user session of the database link to the non-Oracle system. The agent process ends when the user session ends.

Note:
The ODBC driver may require non-Oracle client libraries even if the non-Oracle database is located on the same machine. Refer to your ODBC driver documentation for information about the requirements for the ODBC driver.

1.5 ODBC Connectivity Requirements

To use Oracle Database Gateway for ODBC, you must have an ODBC driver installed on the same machine as the gateway. The ODBC driver manager and driver must meet the following requirements:

- The following ODBC catalog functions must work inside a transaction:

- SQLColumns

- SQLForeignKeys

- SQLGetFunctions

- SQLGetInfo

- SQLGetTypeInfo

- SQLPrimaryKeys

- SQLProcedureColumns

- SQLProcedures

- SQLStatistics

- SQLTables

- On Windows:

- The ODBC driver must have compliance level to ODBC standard 3.0. For multi-byte support, the driver needs to meet ODBC standard 3.5.

- The ODBC driver and driver manager must conform to ODBC application program interface (API) conformance Level 1 or higher. If the ODBC driver or driver manager does not support multiple active ODBC cursors, the complexity of SQL statements that you can execute using Oracle Database Gateway for ODBC is restricted.

- On UNIX:

- The ODBC driver manager must be installed on the same machine.

- The ODBC driver must have compliance level to ODBC Standard 3.0 and have a conformance level 1 or higher. If the ODBC driver works with an ODBC driver manager, the ODBC driver manager must be compliant with ODBC Standard 3.0 or higher. The ODBC driver must have compliance level to ODBC standard 3.0. For multi-byte support, the driver needs to meet ODBC standard 3.5.

- See Also:
Your ODBC driver documentation for dependencies on an ODBC driver manager, and Oracle Database Concepts for more information on transaction isolation levels.

- The ODBC driver you use must support all of the core SQL ODBC data types and must support SQL grammar level SQL_92. The ODBC driver should also expose the following ODBC APIs:

- SQLAllocHandle

- SQLBindCol

- SQLBindParameter

- SQLCancel

- SQLColAttribute

- SQLColumns

- SQLConnect

- SQLDescribeCol

- SQLDisconnect

- SQLDriverConnect

- SQLEndTran

- SQLExecDirect

- SQLExecute

- SQLFetch

- SQLForeignKeys

- SQLFreeHandle

- SQLFreeStmt

- SQLGetConnectAttr

- SQLGetData

- SQLGetDiagField

- SQLGetDiagRec

- SQLGetEnvAttr

- SQLGetFunctions

- SQLGetInfo

- SQLGetStmtAttr

- SQLGetTypeInfo

- SQLMoreResults

- SQLNumResultCols

- SQLParamData

- SQLPrepare

- SQLPrimaryKeys

- SQLProcedureColumns

- SQLProcedures

- SQLPutData

- SQLRowCount

- SQLSetConnectAttr

- SQLSetEnvAttr

- SQLSetDescField

- SQLSetDescRec

- SQLSetStmtAttr

- SQLStatistics - If statistics are to be supported

- SQLTables

2 Oracle Database Gateway for ODBC Features and Restrictions

After the gateway is installed and configured, you can use the gateway to access data in non-Oracle systems, pass native commands from applications to the non-Oracle system, perform distributed queries, and copy data.

This chapter contains the following sections:

- Using the Pass-Through Feature

- Known Restrictions

- Known Problems

2.1 Using the Pass-Through Feature

The gateway can pass native commands or statements from the application to the non-Oracle system using the DBMS_HS_PASSTHROUGH package.

Use the DBMS_HS_PASSTHROUGH package in a PL/SQL block to specify the statement to be passed to the non-Oracle system, as follows:

DECLARE
num_rows INTEGER;
BEGIN
num_rows := DBMS_HS_PASSTHROUGH.EXECUTE_IMMEDIATE@SYBS('command');
END;
/

Where command cannot be one of the following:

- BEGIN TRANSACTION

- COMMIT

- ROLLBACK

- SAVE

- SHUTDOWN

The DBMS_HS_PASSTHROUGH package supports passing bind values and executing SELECT statements.

Note:
TRUNCATE cannot be used in a pass-through statement.

Note:
As a general rule it is recommended that you COMMIT after each DDL statement in the pass-through especially when going to a Sybase database.

See Also:
Oracle Database PL/SQL Packages and Types Reference and Chapter 3 of Oracle Database Heterogeneous Connectivity Administrator's Guide for more information about the DBMS_HS_PASSTHROUGH package.

2.2 Known Restrictions

If you encounter incompatibility problems not listed in this section or in "Known Problems", contact Oracle Support Services. The following section describes the known restrictions:

- BLOB and CLOB data cannot be read by pass-through queries

- Updates or deletes that include unsupported functions within a WHERE clause are not allowed

- Does not support stored procedures

- Cannot participate in distributed transactions; they support single-site transactions only

- Does not support multithreaded agents

- Does not support updating LONG columns with bind variables

- Does not support rowids

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

- SQL Syntax

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

Any COMMIT or ROLLBACK issued in a PL/SQL cursor loop closes all open cursors, which can result in the following error:

ORA-1002:  fetch out of sequence

To prevent this error, move the COMMIT or ROLLBACK statement outside the cursor loop.

2.2.2 SQL Syntax

This section lists restrictions on the following SQL syntax:

- WHERE CURRENT OF Clause

- CONNECT BY Clause

- ROWID

- EXPLAIN PLAN Statement

2.2.2.1 WHERE CURRENT OF Clause

UPDATE and DELETE statements with the WHERE CURRENT OF clause are not supported by the gateway because they rely on the Oracle ROWID implementation. To update or delete a specific row through the gateway, a condition style WHERE clause must be used.

2.2.2.2 CONNECT BY Clause

The gateway does not support the CONNECT BY clause in a SELECT statement.

2.2.2.3 ROWID

The Oracle ROWID implementation is not supported.

2.2.2.4 EXPLAIN PLAN Statement

The EXPLAIN PLAN statement is not supported.

- SQL*Plus COPY Command with Lowercase Table Names
You need to use double quotes to wrap around lowercase table names.

For example:

copy from tkhouser/tkhouser@inst1 insert loc_tkhodept using select * from "tkhodept"@holink2;

- Database Links
The gateway is not multithreaded and cannot support shared database links. Each gateway session spawns a separate gateway process and connections cannot be shared.

See Also:
Appendix B, "Supported SQL Syntax and Functions" for more information about restrictions on SQL syntax.

2.3 Known Problems

This section describes known problems and includes suggestions for correcting them when possible. If you have any questions or concerns about the problems, contact Oracle Support Services.

The following known problems are described in this section:

- Encrypted Format Login

- Date Arithmetic

2.3.1 Encrypted Format Login

Oracle database no longer supports the initialization parameter DBLINK_ENCRYPT_LOGIN. Up to version 7.3, this parameter's default TRUE value prevented the password for the login user ID from being sent over the network (in the clear). Later versions automatically encrypt the password.

2.3.2 Date Arithmetic

The following SQL expressions do not function correctly with the gateway:

date + numbernumber + datedate - numberdate1 - date2

Statements with the preceding expressions are sent to the non-Oracle system without any translation. If the non-Oracle system does not support these date arithmetic functions, then the statements return an error.

A Data Type Conversion

Oracle maps ODBC data types to supported Oracle data types. When the results of a query are returned, Oracle converts the ODBC data types to Oracle data types.

The tables in this appendix show how Oracle maps ODBC data types to supported Oracle data types when it is retrieving data from a non-Oracle system.

This appendix contains the following table:

- Table A-1, "Mapping ODBC Data Types to Oracle Data Types"

A.1 Mapping ODBC Data Types to Oracle Data Types

The Oracle Database Gateway for ODBC maps the data types used in ODBC-compliant data sources to supported Oracle data types. When the results of a query are returned, the Oracle database converts the ODBC data types to Oracle data types. For example, the ODBC data type SQL_TIMESTAMP are converted to Oracle's DATE data type.

If a table contains a column whose data type is not supported by Oracle Database Gateway for ODBC, the column information is not returned to the Oracle database.

Table A-1 maps ODBC data types into Oracle data types.

Table A-1 Mapping ODBC Data Types to Oracle Data Types

ODBC

Oracle

Comment

SQL_BIGINT

NUMBER(19,0)

-

SQL_BINARY

RAW

-

SQL_CHAR

CHAR

-

SQL_DECIMAL(p,s)

NUMBER(p,s)

-

SQL_DOUBLE

FLOAT(53)

-

SQL_FLOAT

FLOAT(53)

-

SQL_INTEGER

NUMBER(10)

Note: It is possible under some circumstance for the INTEGER ANSI data type to map to Precision 38, but it usually maps to Precision 10.

-

SQL_INTERVAL_YEAR

INTERVAL_YEAR_TO_MONTH

-

SQL_INTERVAL_MONTH

INTERVAL_YEAR_TO_MONTH

-

SQL_INTERVAL_YEAR_TO_MONTH

INTERVAL_YEAR_TO_MONTH

-

SQL_INTERVAL_DAY

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_HOUR

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_MINUTE

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_SECOND

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_DAY_TO_HOUR

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_DAY_TO_MINUTE

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_DAY_TO_SECOND

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_HOUR_TO_MINUTE

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_HOUR_TO_SECOND

INTERVAL_DAY_TO_SECOND

-

SQL_INTERVAL_MINUTE_TO_SECOND

INTERVAL_DAY_TO_SECOND

-

SQL_LONGVARBINARY

LONG RAW

-

SQL_LONGVARCHAR

LONG

Note: If an ANSI SQL implementation defines a large value for the maximum length of VARCHAR data, it is possible that ANSI VARCHAR will map to SQL_LONGVARCHAR and Oracle LONG.

-

SQL_NUMERIC(p[,s])

NUMBER(p[,s])

-

SQL_REAL

FLOAT(24)

-

SQL_SMALLINT

NUMBER(5)

-

SQL_TYPE_TIME

CHAR(15)

-

SQL_TINYINT

NUMBER(3)

-

SQL_TYPE_DATE

DATE

-

SQL_TIMESTAMP

DATE

-

SQL_VARBINARY

RAW

-

SQL_VARCHAR

VARCHAR2

-

SQL_WCHAR

NCHAR

-

SQL_WVARCHAR

NVARCHAR

-

SQL_WLONGVARCHAR

LONG

if Oracle DB Character Set = Unicode. Otherwise, it is not supported

SQL_BIT

NUMBER(3)

-

B Supported SQL Syntax and Functions

This appendix contains the following sections:

- Supported SQL Statements

- Oracle Functions

B.1 Supported SQL Statements

Oracle Database Gateway for ODBC supports the following statements, but only if the ODBC driver and non-Oracle system can execute them and if the statements contain supported Oracle SQL functions:

- DELETE

- INSERT

- SELECT

- UPDATE

With a few exceptions, the gateway provides full support for Oracle DELETE, INSERT, SELECT, and UPDATE statements.

The gateway does not support Oracle data definition language (DDL) statements. No form of the Oracle ALTER, CREATE, DROP, GRANT, or TRUNCATE statements can be used. Instead, for ALTER, CREATE, DROP, and GRANT statements, use the pass-through feature of the gateway if you need to use DDL statements against the non-Oracle system database.

Note:
TRUNCATE cannot be used in a pass-through statement.

See Also:
Oracle Database SQL Language Reference for detailed descriptions of keywords, parameters, and options.

B.1.1 DELETE

The DELETE statement is fully supported. However, only Oracle functions supported by the non-Oracle system can be used.

B.1.2 INSERT

The INSERT statement is fully supported. However, only Oracle functions supported by the non-Oracle system can be used.

B.1.3 SELECT

The SELECT statement is fully supported, with these exceptions:

- CONNECT BY condition

- NOWAIT

- START WITH condition

- WHERE CURRENT OF

B.1.4 UPDATE

The UPDATE statement is fully supported. However, only Oracle functions supported by the non-Oracle system can be used. Also, you cannot have SQL statements in the subquery that refer to the same table name in the outer query. Subqueries are not supported in the SET clause.

B.2 Oracle Functions

All functions are evaluated by the non-Oracle system after the gateway has converted them to the native SQL. Only a limited set of functions are assumed to be supported by the non-Oracle system. Most Oracle functions have no equivalent function in this limited set. Consequently, although post-processing is performed by the Oracle database, many Oracle functions are not supported by Oracle Database Gateway for ODBC, possibly impacting performance.

If an Oracle SQL function is not supported by Oracle Database Gateway for ODBC, this function is not supported in DELETE, INSERT, or UPDATE statements. In SELECT statements, these functions are evaluated by the Oracle database and processed after they are returned from the non-Oracle system.

If an unsupported function is used in a DELETE, INSERT, or UPDATE statement, it generates the following Oracle error:

ORA-02070: database db_link_name does not support function in this context

Oracle Database Gateway for ODBC assumes that the following minimum set of SQL functions is supported by the ODBC driver provider that is being used:

- AVG(exp)

- LIKE(exp)

- COUNT(*)

- MAX(exp)

- MIN(exp)

- NOT

C Data Dictionary

Data dictionary information is stored in the non-Oracle system as system tables and is accessed through ODBC application programming interfaces (APIs). This appendix documents data dictionary translation support. It explains how to access non-Oracle data dictionaries, describes how to use supported views and tables, and explains data dictionary mapping.

This appendix contains the following topics:

- Accessing the Non-Oracle Data Dictionary

- Views and Tables Supported by Oracle Database Gateway for ODBC

C.1 Accessing the Non-Oracle Data Dictionary

Accessing a non-Oracle data dictionary table or view is identical to accessing a data dictionary in an Oracle database. You issue a SELECT statement specifying a database link. The Oracle data dictionary view and column names are used to access the non-Oracle data dictionary. Synonyms of supported views are also acceptable.

For example, the following statement queries the data dictionary table ALL_USERS to retrieve all users in the non-Oracle system:

SQL SELECT * FROM all_users@sid1;

When you issue a data dictionary access query, the ODBC agent:

1. Maps the requested table, view, or synonym to one or more ODBC APIs (see Section C.2.1, "Data Dictionary Mapping"). The agent translates all data dictionary column names to their corresponding non-Oracle column names within the query.

2. Sends the sequence of APIs to the non-Oracle system.

3. Possibly converts the retrieved non-Oracle data to give it the appearance of the Oracle data dictionary table.

4. Passes the data dictionary information from the non-Oracle system table to Oracle.

Note:
The values returned when querying the Oracle Database Gateway for ODBC data dictionary may not be the same as those returned by the Oracle SQL*Plus DESCRIBE command.

C.2 Views and Tables Supported by Oracle Database Gateway for ODBC

Oracle Database Gateway for ODBC supports only the views and tables shown in Table C-1.

If you use an unsupported view, you receive an Oracle error message stating no rows were selected.

If you want to query data dictionary views using SELECT... FROM DBA_*, first connect as Oracle user SYSTEM or SYS. Otherwise, you receive the following error message:

ORA-28506: Parse error in data dictionary translation for %s stored in %s

Using Oracle Database Gateway for ODBC, queries of the supported data dictionary tables and views beginning with the characters ALL_ may return rows from the non-Oracle system when you do not have access privileges for those non-Oracle objects. When querying an Oracle database with the Oracle data dictionary, rows are returned only for those objects you are permitted to access.

C.2.1 Data Dictionary Mapping

The tables in this section list Oracle data dictionary view names and the equivalent ODBC APIs used. Table C-1 shows a list of all Oracle data dictionary view names supported by Oracle Database Gateway for ODBC.

Table C-1 Oracle Database Gateway for ODBC Data Dictionary Mapping

View

ODBC API

ALL_CATALOG

SQLTables

ALL_COL_COMMENTS

SQLColumns

ALL_CONS_COLUMNS

SQLPrimaryKeys, SQLForeignKeys

ALL_CONSTRAINTS

SQLPrimaryKeys, SQLForeignKeys

ALL_IND_COLUMNS

SQLStatistics

ALL_INDEXES

SQLStatistics

ALL_OBJECTS

SQLTables, SQLProcedures, SQLStatistics

ALL_TAB_COLUMNS

SQLColumns

ALL_TAB_COMMENTS

SQLTables

ALL_TABLES

SQLStatistics

ALL_USERS

SQLTables

ALL_VIEWS

SQLTables

DICTIONARY

SQLTables

DICT_COLUMNS

SQLTables

USER_COL_COMMENTS

SQLColumns

USER_CONS_COLUMNS

SQLPrimaryKeys, SQLForeignKeys

USER_CONSTRAINTS

SQLPrimaryKeys, SQLForeignKeys

USER_IND_COLUMNS

SQLStatistics

USER_INDEXES

SQLStatistics

USER_OBJECTS

SQLTables, SQLProcedures, SQLStatistics

USER_TABCOLUMNS

SQLColumns

USER_TAB_COMMENTS

SQLTables

USER_TABLES

SQLStatistics

USER_USERS

SQLTables

USER_VIEWS

SQLTables

C.2.2 Oracle Database Gateway for ODBC Data Dictionary Descriptions

The Oracle Database Gateway for ODBC data dictionary tables and views provide the following information:

- Name, data type, and width of each column

- The contents of columns with fixed values

In the descriptions that follow, the values in the Null? column may differ from the Oracle data dictionary tables and views. Any default value is shown to the right of an item.

Table C-2 ALL_CATALOG

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_TYPE

-

VARCHAR2(11)

"TABLE" or "VIEW" or "SYNONYM"

Table C-3 ALL_COL_COMMENTS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

COLUMN_NAME

NOT NULL

VARCHAR2(30)

-

COMMENTS

-

VARCHAR2(4000)

NULL

Table C-4 ALL_CONS_COLUMNS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

CONSTRAINT_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

COLUMN_NAME

-

VARCHAR2(4000)

-

POSITION

-

NUMBER

-

Table C-5 ALL_CONSTRAINTS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

CONSTRAINT_NAME

NOT NULL

VARCHAR2(30)

-

CONSTRAINT_TYPE

-

VARCHAR2(1)

"R" or "P"

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

SEARCH_CONDITION

-

LONG

NULL

R_OWNER

-

VARCHAR2(30)

-

R_CONSTRAINT_NAME

-

VARCHAR2(30)

-

DELETE_RULE

-

VARCHAR2(9)

"CASCADE" or "NO ACTION" or "SET NULL"

STATUS

-

VARCHAR2(8)

NULL

DEFERRABLE

-

VARCHAR2(14)

NULL

DEFERRED

-

VARCHAR2(9)

NULL

VALIDATED

-

VARCHAR2(13)

NULL

GENERATED

-

VARCHAR2(14)

NULL

BAD

-

VARCHAR2(3)

NULL

RELY

-

VARCHAR2(4)

NULL

LAST_CHANGE

-

DATE

NULL

Table C-6 ALL_IND_COLUMNS

Name

Null?

Type

Value

INDEX_OWNER

NOT NULL

VARCHAR2(30)

-

INDEX_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_OWNER

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

COLUMN_NAME

-

VARCHAR2(4000)

-

COLUMN_POSITION

NOT NULL

NUMBER

-

COLUMN_LENGTH

NOT NULL

NUMBER

-

DESCEND

-

VARCHAR2(4)

"DESC" or "ASC"

Table C-7 ALL_INDEXES

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

INDEX_NAME

NOT NULL

VARCHAR2(30)

-

INDEX_TYPE

-

VARCHAR2(27)

NULL

TABLE_OWNER

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_TYPE

-

CHAR(5)

"TABLE"

UNIQUENESS

-

VARCHAR2(9)

"UNIQUE" or "NONUNIQUE"

COMPRESSION

-

VARCHAR2(8)

NULL

PREFIX_LENGTH

-

NUMBER

0

TABLESPACE_NAME

-

VARCHAR2(30)

NULL

INI_TRANS

-

NUMBER

0

MAX_TRANS

-

NUMBER

0

INITIAL_EXTENT

-

NUMBER

0

NEXT_EXTENT

-

NUMBER

0

MIN_EXTENTS

-

NUMBER

0

MAX_EXTENTS

-

NUMBER

0

PCT_INCREASE

-

NUMBER

0

PCT_THRESHOLD

-

NUMBER

0

INCLUDE_COLUMNS

-

NUMBER

0

FREELISTS

-

NUMBER

0

FREELIST_GROUPS

-

NUMBER

0

PCT_FREE

-

NUMBER

0

LOGGING

-

VARCHAR2(3)

NULL

BLEVEL

-

NUMBER

0

LEAF_BLOCKS

-

NUMBER

0

DISTINCT_KEYS

-

NUMBER

AVG_LEAF_BLOCKS_PER_KEY

-

NUMBER

0

AVG_DATA_BLOCKS_PER_KEY

-

NUMBER

0

CLUSTERING_FACTOR

-

NUMBER

0

STATUS

-

VARCHAR2(8)

NULL

NUM_ROWS

-

NUMBER

0

SAMPLE_SIZE

-

NUMBER

0

LAST_ANALYZED

-

DATE

NULL

DEGREE

-

VARCHAR2(40)

NULL

INSTANCES

-

VARCHAR2(40)

NULL

PARTITIONED

-

VARCHAR2(3)

NULL

TEMPORARY

-

VARCHAR2(1)

NULL

GENERATED

-

VARCHAR2(1)

NULL

SECONDARY

-

VARCHAR2(1)

NULL

BUFFER_POOL

-

VARCHAR2(7)

NULL

USER_STATS

-

VARCHAR2(3)

NULL

DURATION

-

VARCHAR2(15)

NULL

PCT_DIRECT_ACCESS

-

NUMBER

0

ITYP_OWNER

-

VARCHAR2(30)

NULL

ITYP_NAME

-

VARCHAR2(30)

NULL

PARAMETERS

-

VARCHAR2(1000)

NULL

GLOBAL_STATS

-

VARCHAR2(3)

NULL

DOMIDX_STATUS

-

VARCHAR2(12)

NULL

DOMIDX_OPSTATUS

-

VARCHAR2(6)

NULL

FUNCIDX_STATUS

-

VARCHAR2(8)

NULL

Table C-8 ALL_OBJECTS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

OBJECT_NAME

NOT NULL

VARCHAR2(30)

-

SUBOBJECT_NAME

-

VARCHAR2(30)

NULL

OBJECT_ID

NOT NULL

NUMBER

0

DATA_OBJECT_ID

-

NUMBER

0

OBJECT_TYPE

-

VARCHAR2(18)

"TABLE" or "VIEW" or "SYNONYM" or "INDEX" or "PROCEDURE"

CREATED

NOT NULL

DATE

NULL

LAST_DDL_TIME

NOT NULL

DATE

NULL

TIMESTAMP

-

VARCHAR2(19)

NULL

STATUS

-

VARCHAR2(7)

NULL

TEMPORARY

-

VARCHAR2(1)

NULL

GENERATED

-

VARCHAR2(1)

NULL

SECONDARY

-

VARCHAR2(1)

NULL

Table C-9 ALL_TAB_COLUMNS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

COLUMN_NAME

NOT NULL

VARCHAR2(30)

-

DATA_TYPE

-

VARCHAR2(106)

-

DATA_TYPE_MOD

-

VARCHAR2(3)

NULL

DATA_TYPE_OWNER

-

VARCHAR2(30)

NULL

DATA_LENGTH

NOT NULL

NUMBER

-

DATA_PRECISION

-

NUMBER

-

DATA_SCALE

-

NUMBER

-

NULLABLE

-

VARCHAR2(1)

"Y" or "N"

COLUMN_ID

NOT NULL

NUMBER

-

DEFAULT_LENGTH

-

NUMBER

0

DATA_DEFAULT

-

LONG

NULL

NUM_DISTINCT

-

NUMBER

0

LOW_VALUE

-

RAW(32)

NULL

HIGH_VALUE

-

RAW(32)

NULL

DENSITY

-

NUMBER

0

NUM_NULLS

-

NUMBER

0

NUM_BUCKETS

-

NUMBER

0

LAST_ANALYZED

-

DATE

NULL

SAMPLE_SIZE

-

NUMBER

0

CHARACTER_SET_NAME

-

VARCHAR2(44)

NULL

CHAR_COL_DEC_LENGTH

-

NUMBER

0

GLOBAL_STATS

-

VARCHAR2(3)

NULL

USER_STATS

-

VARCHAR2(3)

NULL

AVG_COL_LEN

-

NUMBER

0

Table C-10 ALL_TAB_COMMENTS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_TYPE

-

VARCHAR2(11)

"TABLE" or "VIEW"

COMMENTS

-

VARCHAR2(4000)

NULL

Table C-11 ALL_TABLES

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

TABLESPACE_NAME

-

VARCHAR2(30)

NULL

CLUSTER_NAME

-

VARCHAR2(30)

NULL

IOT_NAME

-

VARCHAR2(30)

NULL

PCT_FREE

-

NUMBER

0

PCT_USED

-

NUMBER

0

INI_TRANS

-

NUMBER

0

MAX_TRANS

-

NUMBER

0

INITIAL_EXTENT

-

NUMBER

0

NEXT_EXTENT

-

NUMBER

0

MIN_EXTENTS

-

NUMBER

0

MAX_EXTENTS

-

NUMBER

0

PCT_INCREASE

-

NUMBER

0

FREELISTS

-

NUMBER

0

FREELIST_GROUPS

-

NUMBER

0

LOGGING

-

VARCHAR2(3)

NULL

BACKED_UP

-

VARCHAR2(1)

NULL

NUM_ROWS

-

NUMBER

-

BLOCKS

-

NUMBER

-

EMPTY_BLOCKS

-

NUMBER

0

AVG_SPACE

-

NUMBER

0

CHAIN_CNT

-

NUMBER

0

AVG_ROW_LEN

-

NUMBER

0

AVG_SPACE_FREELIST_BLOCKS

-

NUMBER

0

NUM_FREELIST_BLOCKS

-

NUMBER

0

DEGREE

-

VARCHAR2(10)

NULL

INSTANCES

-

VARCHAR2(10)

NULL

CACHE

-

VARCHAR2(5)

NULL

TABLE_LOCK

-

VARCHAR2(8)

NULL

SAMPLE_SIZE

-

NUMBER

0

LAST_ANALYZED

-

DATE

NULL

PARTITIONED

-

VARCHAR2(3)

NULL

IOT_TYPE

-

VARCHAR2(12)

NULL

TEMPORARY

-

VARCHAR2(1)

NULL

SECONDARY

-

VARCHAR2(1)

NULL

NESTED

-

VARCHAR2(3)

NULL

BUFFER_POOL

-

VARCHAR2(7)

NULL

ROW_MOVEMENT

-

VARCHAR2(8)

NULL

GLOBAL_STATS

-

VARCHAR2(3)

NULL

USER_STATS

-

VARCHAR2(3)

NULL

DURATION

-

VARHCAR2(15)

NULL

SKIP_CORRUPT

-

VARCHAR2(8)

NULL

MONITORING

-

VARCHAR2(3)

NULL

Table C-12 ALL_USERS

Name

Null?

Type

Value

USERNAME

NOT NULL

VARCHAR2(30)

-

USER_ID

NOT NULL

NUMBER

0

CREATED

NOT NULL

DATE

NULL

Table C-13 ALL_VIEWS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

VIEW_NAME

NOT NULL

VARCHAR2(30)

-

TEXT_LENGTH

-

NUMBER

0

TEXT

NOT NULL

LONG

NULL

TYPE_TEXT_LENGTH

-

NUMBER

0

TYPE_TEXT

-

VARCHAR2(4000)

NULL

OID_TEXT_LENGTH

-

NUMBER

0

OID_TEXT

-

VARCHAR2(4000)

NULL

VIEW_TYPE_OWNER

-

VARCHAR2(30)

NULL

VIEW_TYPE

-

VARCHAR2(30)

NULL

Table C-14 DICTIONARY

Name

Null?

Type

Value

TABLE_NAME

-

VARCHAR2(30)

-

COMMENTS

-

VARCHAR2(4000)

NULL

Table C-15 DICT_COLUMNS

Name

Null?

Type

Value

TABLE_NAME

-

VARCHAR2(30)

-

COLUMN_NAME

-

VARCHAR2(30)

-

COMMENTS

-

VARCHAR2(4000)

NULL

Table C-16 USER_CATALOG

Name

Null?

Type

Value

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_TYPE

-

VARCHAR2(11)

"TABLE" or, "VIEW" or "SYNONYM"

Table C-17 USER_COL_COMMENTS

Name

Null?

Type

Value

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

COLUMN_NAME

NOT NULL

VARCHAR2(30)

-

COMMENTS

-

VARCHAR2(4000)

NULL

Table C-18 USER_CONS_COLUMNS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

CONSTRAINT_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

COLUMN_NAME

-

VARCHAR2(4000)

-

POSITION

-

NUMBER

-

Table C-19 USER_CONSTRAINTS

Name

Null?

Type

Value

OWNER

NOT NULL

VARCHAR2(30)

-

CONSTRAINT_NAME

NOT NULL

VARCHAR2(30)

-

CONSTRAINT_TYPE

-

VARCHAR2(1)

R or P

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

SEARCH_CONDITION

-

LONG

NULL

R_OWNER

-

VARCHAR2(30)

-

R_CONSTRAINT_NAME

-

VARCHAR2(30)

-

DELETE_RULE

-

VARCHAR2(9)

"CASCADE" or "NO ACTION" or "SET NULL"

STATUS

-

VARCHAR2(8)

NULL

DEFERRABLE

-

VARCHAR2(14)

NULL

DEFERRED

-

VARCHAR2(9)

NULL

VALIDATED

-

VARCHAR2(13)

NULL

GENERATED

-

VARCHAR2(14)

NULL

BAD

-

VARCHAR2(3)

NULL

RELY

-

VARCHAR2(4)

NULL

LAST_CHANGE

-

DATE

NULL

Table C-20 USER_IND_COLUMNS

Name

Null?

Type

Value

INDEX_NAME

-

VARCHAR2(30)

-

TABLE_NAME

-

VARCHAR2(30)

-

COLUMN_NAME

-

VARCHAR2(4000)

-

COLUMN_POSITION

-

NUMBER

-

COLUMN_LENGTH

-

NUMBER

-

DESCEND

-

VARCHAR2(4)

"DESC" or "ASC"

Table C-21 USER_INDEXES

Name

Null?

Type

Value

INDEX_NAME

NOT NULL

VARCHAR2(30)

-

INDEX_TYPE

-

VARCHAR2(27)

NULL

TABLE_OWNER

NOT NULL

VARCHAR2(30)

-

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_TYPE

-

VARCHAR2(11)

"TABLE"

UNIQUENESS

-

VARCHAR2(9)

"UNIQUE" or "NONUNIQUE"

COMPRESSION

-

VARCHAR2(8)

NULL

PREFIX_LENGTH

-

NUMBER

0

TABLESPACE_NAME

-

VARCHAR2(30)

NULL

INI_TRANS

-

NUMBER

0

MAX_TRANS

-

NUMBER

0

INITIAL_EXTENT

-

NUMBER

0

NEXT_EXTENT

-

NUMBER

0

MIN_EXTENTS

-

NUMBER

0

MAX_EXTENTS

-

NUMBER

0

PCT_INCREASE

-

NUMBER

0

PCT_THRESHOLD

-

NUMBER

0

INCLUDE_COLUMNS

-

NUMBER

0

FREELISTS

-

NUMBER

0

FREELIST_GROUPS

-

NUMBER

0

PCT_FREE

-

NUMBER

0

LOGGING

-

VARCHAR2(3)

NULL

BLEVEL

-

NUMBER

0

LEAF_BLOCKS

-

NUMBER

0

DISTINCT_KEYS

-

NUMBER

-

AVG_LEAF_BLOCKS_PER_KEY

-

NUMBER

0

AVG_DATA_BLOCKS_PER_KEY

-

NUMBER

0

CLUSTERING_FACTOR

-

NUMBER

0

STATUS

-

VARCHAR2(8)

NULL

NUM_ROWS

-

NUMBER

0

SAMPLE_SIZE

-

NUMBER

0

LAST_ANALYZED

-

DATE

NULL

DEGREE

-

VARCHAR2(40)

NULL

INSTANCES

-

VARCHAR2(40)

NULL

PARTITIONED

-

VARCHAR2(3)

NULL

TEMPORARY

-

VARCHAR2(1)

NULL

GENERATED

-

VARCHAR2(1)

NULL

SECONDARY

-

VARCHAR2(1)

NULL

BUFFER_POOL

-

VARCHAR2(7)

NULL

USER_STATS

-

VARCHAR2(3)

NULL

DURATION

-

VARHCAR2(15)

NULL

PCT_DIRECT_ACCESS

-

NUMBER

0

ITYP_OWNER

-

VARCHAR2(30)

NULL

ITYP_NAME

-

VARCHAR2(30)

NULL

PARAMETERS

-

VARCHAR2(1000)

NULL

GLOBAL_STATS

-

VARCHAR2(3)

NULL

DOMIDX_STATUS

-

VARCHAR2(12)

NULL

DOMIDX_OPSTATUS

-

VARCHAR2(6)

NULL

FUNCIDX_STATUS

-

VARCHAR2(8)

NULL

Table C-22 USER_OBJECTS

Name

Null?

Type

Value

OBJECT_NAME

-

VARCHAR2(128)

-

SUBOBJECT_NAME

-

VARCHAR2(30)

NULL

OBJECT_ID

-

NUMBER

0

DATA_OBJECT_ID

-

NUMBER

0

OBJECT_TYPE

-

VARCHAR2(18)

"TABLE" or "VIEW" or "SYNONYM" or "INDEX" or "PROCEDURE"

CREATED

-

DATE

NULL

LAST_DDL_TIME

-

DATE

NULL

TIMESTAMP

-

VARCHAR2(19)

NULL

STATUS

-

VARCHAR2(7)

NULL

TEMPORARY

-

VARCHAR2(1)

NULL

GENERATED

-

VARCHAR2(1)

NULL

SECONDARY

-

VARCHAR2(1)

NULL

Table C-23 USER_TABCOLUMNS

Name

Null?

Type

Value

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

COLUMN_NAME

NOT NULL

VARCHAR2(30)

-

DATA_TYPE

-

VARCHAR2(106)

-

DATA_TYPE_MOD

-

VARCHAR2(3)

NULL

DATA_TYPE_OWNER

-

VARCHAR2(30)

NULL

DATA_LENGTH

NOT NULL

NUMBER

-

DATA_PRECISION

-

NUMBER

-

DATA_SCALE

-

NUMBER

-

NULLABLE

-

VARCHAR2(1)

"Y" or "N"

COLUMN_ID

NOT NULL

NUMBER

-

DEFAULT_LENGTH

-

NUMBER

NULL

DATA_DEFAULT

-

LONG

NULL

NUM_DISTINCT

-

NUMBER

NULL

LOW_VALUE

-

RAW(32)

NULL

HIGH_VALUE

-

RAW(32)

NULL

DENSITY

-

NUMBER

0

NUM_NULLS

-

NUMBER

0

NUM_BUCKETS

-

NUMBER

0

LAST_ANALYZED

-

DATE

NULL

SAMPLE_SIZE

-

NUMBER

0

CHARACTER_SET_NAME

-

VARCHAR2(44)

NULL

CHAR_COL_DECL_LENGTH

-

NUMBER

0

GLOBAL_STATS

-

VARCHAR2(3)

NULL

USER_STATS

-

VARCHAR2(3)

NULL

AVG_COL_LEN

-

NUMBER

0

Table C-24 USER_TAB_COMMENTS

Name

Null?

Type

Value

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

TABLE_TYPE

-

VARCHAR2(11)

"TABLE" or "VIEW"

COMMENTS

-

VARCHAR2(4000)

NULL

Table C-25 USER_TABLES

Name

Null?

Type

Value

TABLE_NAME

NOT NULL

VARCHAR2(30)

-

TABLESPACE_NAME

-

VARCHAR2(30)

NULL

CLUSTER_NAME

-

VARCHAR2(30)

NULL

IOT_NAME

-

VARCHAR2(30)

NULL

PCT_FREE

-

NUMBER

0

PCT_USED

-

NUMBER

0

INI_TRANS

-

NUMBER

0

MAX_TRANS

-

NUMBER

0

INITIAL_EXTENT

-

NUMBER

0

NEXT_EXTENT

-

NUMBER

0

MIN_EXTENTS

-

NUMBER

0

MAX_EXTENTS

-

NUMBER

0

PCT_INCREASE

-

NUMBER

0

FREELISTS

-

NUMBER

0

FREELIST_GROUPS

-

NUMBER

0

LOGGING

-

VARCHAR2(3)

NULL

BACKED_UP

-

VARCHAR2(1)

NULL

NUM_ROWS

-

NUMBER

-

BLOCKS

-

NUMBER

-

EMPTY_BLOCKS

-

NUMBER

0

AVG_SPACE

-

NUMBER

0

CHAIN_CNT

-

NUMBER

0

AVG_ROW_LEN

-

NUMBER

0

AVG_SPACE_FREELIST_BLOCKS

-

NUMBER

0

NUM_FREELIST_BLOCKS

-

NUMBER

0

DEGREE

-

VARCHAR2(10)

NULL

INSTANCES

-

VARCHAR2(10)

NULL

CACHE

-

VARCHAR2(5)

NULL

TABLE_LOCK

-

VARCHAR2(8)

NULL

SAMPLE_SIZE

-

NUMBER

0

LAST_ANALYZED

-

DATE

NULL

PARTITIONED

-

VARCHAR2(3)

NULL

IOT_TYPE

-

VARCHAR2(12)

NULL

TEMPORARY

-

VARHCAR2(1)

NULL

SECONDARY

-

VARCHAR2(1)

NULL

NESTED

-

VARCHAR2(3)

NULL

BUFFER_POOL

-

VARCHAR2(7)

NULL

ROW_MOVEMENT

-

VARCHAR2(8)

NULL

GLOBAL_STATS

-

VARCHAR2(3)

NULL

USER_STATS

-

VARCHAR2(3)

NULL

DURATION

-

VARCHAR2(15)

NULL

SKIP_CORRUPT

-

VARCHAR2(8)

NULL

MONITORING

-

VARCHAR2(3)

NULL

Table C-26 USER_USERS

Name

Null?

Type

Value

USERNAME

NOT NULL

VARCHAR2(30)

-

USER_ID

NOT NULL

NUMBER

0

ACCOUNT_STATUS

NOT NULL

VARCHAR2(32)

OPEN

LOCK_DATE

-

DATE

NULL

EXPIRY_DATE

-

DATE

NULL

DEFAULT_TABLESPACE

NOT NULL

VARCHAR2(30)

NULL

TEMPORARY_TABLESPACE

NOT NULL

VARCHAR2(30)

NULL

CREATED

NOT NULL

DATE

NULL

INITIAL_RSRC_CONSUMER_GROUP

-

VARCHAR2(30)

NULL

EXTERNAL_NAME

-

VARCHAR2(4000)

NULL

Table C-27 USER_VIEWS

Name

Null?

Type

Value

VIEW_NAME

NOT NULL

VARCHAR2(30)

-

TEXT_LENGTH

-

NUMBER

0

TEXT

-

LONG

NULL

TYPE_TEXT_LENGTH

-

NUMBER

0

TYPE_TEXT

-

VARCHAR2(4000)

NULL

OID_TEXT_LENGTH

-

NUMBER

0

OID_TEXT

-

VARCHAR2(4000)

NULL

VIEW_TYPE_OWNER

-

VARCHAR2(30)

NULL

VIEW_TYPE

-

VARCHAR2(30)

NULL

D Initialization Parameters

The Oracle database initialization parameters in the init.ora file are distinct from gateway initialization parameters. Set the gateway parameters in the initialization parameter file using an agent-specific mechanism, or set them in the Oracle data dictionary using the DBMS_HS package. The gateway initialization parameter file must be available when the gateway is started.

This appendix contains a list of the gateway initialization parameters that can be set for each gateway and their description. It also describes the initialization parameter file syntax. It includes the following sections:

- Initialization Parameter File Syntax

- Oracle Database Gateway for ODBC Initialization Parameters

- Initialization Parameter Descriptions

D.1 Initialization Parameter File Syntax

The syntax for the initialization parameter file is as follows:

1. The file is a sequence of commands.

2. Each command should start on a separate line.

3. End of line is considered a command terminator (unless escaped with a backslash).

4. If there is a syntax error in an initialization parameter file, none of the settings take effect.

5. Set the parameter values as follows:

[SET][PRIVATE] parameter=value

Where:

parameter is an initialization parameter name. It is a string of characters starting with a letter and consisting of letters, digits and underscores. Initialization parameter names are case sensitive.

value is the initialization parameter value. It is case sensitive. An initialization parameter value is either:

1. A string of characters that does not contain any backslashes, white space or double quotation marks (")

2. A quoted string beginning with a double quotation mark and ending with a double quotation mark. The following can be used inside a quoted string:

- backslash (\) is the escape character

- \n inserts a new line

- \t inserts a tab

- \" inserts a double quotation mark

- \\ inserts a backslash

A backslash at the end of the line continues the string on the next line. If a backslash precedes any other character then the backslash is ignored.

For example, to enable tracing for an agent, set the HS_FDS_TRACE_LEVEL initialization parameter as follows:

HS_FDS_TRACE_LEVEL=ON

SET and PRIVATE are optional keywords. You cannot use either as an initialization parameter name. Most parameters are needed only as initialization parameters, so you usually do not need to use the SET or PRIVATE keywords. If you do not specify either SET or PRIVATE, the parameter is used only as an initialization parameter for the agent.

SET specifies that, in addition to being used as an initialization parameter, the parameter value is set as an environment variable for the agent process. Use SET for parameter values that the drivers or non-Oracle system need as environment variables.

PRIVATE specifies that the initialization parameter should be private to the agent and should not be uploaded to the Oracle database. Most initialization parameters should not be private. If, however, you are storing sensitive information like a password in the initialization parameter file, then you may not want it uploaded to the server because the initialization parameters and values are not encrypted when uploaded. Making the initialization parameters private prevents the upload from happening and they do not appear in dynamic performance views. Use PRIVATE for the initialization parameters only if the parameter value includes sensitive information such as a user name or password.

SET PRIVATE specifies that the parameter value is set as an environment variable for the agent process and is also private (not transferred to the Oracle database, not appearing in dynamic performance views or graphical user interfaces).

D.2 Oracle Database Gateway for ODBC Initialization Parameters

This section lists all the initialization file parameters that can be set for the Oracle Database Gateway for ODBC. They are as follows:

- HS_DB_DOMAIN

- HS_DB_INTERNAL_NAME

- HS_DB_NAME

- HS_DESCRIBE_CACHE_HWM

- HS_LANGUAGE

- HS_LONG_PIECE_TRANSFER_SIZE

- HS_OPEN_CURSORS

- HS_RPC_FETCH_REBLOCKING

- HS_RPC_FETCH_SIZE

- HS_FDS_SHAREABLE_NAME

- HS_TIME_ZONE

- IFILE

- HS_FDS_CONNECT_INFO

- HS_FDS_DEFAULT_OWNER

- HS_FDS_TRACE_LEVEL

- HS_TRANSACTION_MODEL

- HS_FDS_FETCH_ROWS

D.3 Initialization Parameter Description

The following sections describe all the initialization file parameters that can be set for gateways.

D.3.1 HS_DB_DOMAIN

Property

Description

Default value

WORLD

Range of values

1 to 199 characters

Specifies a unique network sub-address for a non-Oracle system. The HS_DB_DOMAIN initialization parameter is similar to the DB_DOMAIN initialization parameter, described in the Oracle Database Reference. The HS_DB_DOMAIN initialization parameter is required if you use the Oracle Names server. The HS_DB_NAME and HS_DB_DOMAIN initialization parameters define the global name of the non-Oracle system.

Note:
The HS_DB_NAME and HS_DB_DOMAIN initialization parameters must combine to form a unique address in a cooperative server environment.

D.3.2 HS_DB_INTERNAL_NAME

Property

Description

Default value

01010101

Range of values

1 to 16 hexadecimal characters

Specifies a unique hexadecimal number identifying the instance to which the Heterogeneous Services agent is connected. This parameter's value is used as part of a transaction ID when global name services are activated. Specifying a nonunique number can cause problems when two-phase commit recovery actions are necessary for a transaction.

D.3.3 HS_DB_NAME

Property

Description

Default value

HO

Range of values

1 to 8 characters

Specifies a unique alphanumeric name for the data store given to the non-Oracle system. This name identifies the non-Oracle system within the cooperative server environment. The HS_DB_NAME and HS_DB_DOMAIN initialization parameters define the global name of the non-Oracle system.

D.3.4 HS_DESCRIBE_CACHE_HWM

Property

Description

Default value

100

Range of values

1 to 4000

Specifies the maximum number of entries in the describe cache used by Heterogeneous Services. This limit is known as the describe cache high water mark. The cache contains descriptions of the mapped tables that Heterogeneous Services reuses so that it does not have to re-access the non-Oracle data store.

If you are accessing many mapped tables, increase the high water mark to improve performance. Increasing the high water mark improves performance at the cost of memory usage.

D.3.5 HS_LANGUAGE

Property

Description

Default value

System-specific

Range of values

Any valid language name (up to 255 characters)

Provides Heterogeneous Services with character set, language, and territory information of the non-Oracle data source. The value must use the following format:

language[_territory.character_set]

Note:
The globalization support initialization parameters affect error messages, the data for the SQL Service, and parameters in distributed external procedures.

D.3.5.1 Character Sets

Ideally, the character sets of the Oracle database and the non-Oracle data source are the same. If they are not the same, Heterogeneous Services attempts to translate the character set of the non-Oracle data source to the Oracle database character set, and back again. The translation can degrade performance. In some cases, Heterogeneous Services cannot translate a character from one character set to another.

Note:
The specified character set must be a superset of the operating system character set on the platform where the agent is installed.

D.3.5.2 Language

The language component of the HS_LANGUAGE initialization parameter determines:

- Day and month names of dates

- AD, BC, PM, and AM symbols for date and time

- Default sorting mechanism

Note that Oracle does not determine the language for error messages for the generic Heterogeneous Services messages (ORA-25000 through ORA-28000). These are controlled by the session settings in the Oracle database.

Note:
Use the HS_NLS_DATE_LANGUAGE initialization parameter to set the day and month names, and the AD, BC, PM, and AM symbols for dates and time independently from the language.

D.3.5.3 Territory

The territory clause specifies the conventions for day and week numbering, default date format, decimal character and group separator, and ISO and local currency symbols. Note that the level of globalization support between the Oracle database and the non-Oracle data source depends on how the gateway is implemented.

D.3.6 HS_LONG_PIECE_TRANSFER_SIZE

Property

Description

Default value

64 KB

Range of values

Any value up to 2 GB

Sets the size of the piece of LONG data being transferred. A smaller piece size means less memory requirement, but more round-trips to fetch all the data. A larger piece size means fewer round-trips, but more of a memory requirement to store the intermediate pieces internally. Thus, the initialization parameter can be used to tune a system for the best performance, with the best trade-off between round-trips and memory requirements, and network latency or response time.

D.3.7 HS_OPEN_CURSORS

Property

Description

Default value

50

Range of values

1 to the value of OPEN_CURSORS initialization parameter of Oracle database

Defines the maximum number of cursors that can be open on one connection to a non-Oracle system instance.

The value never exceeds the number of open cursors in the Oracle database. Therefore, setting the same value as the OPEN_CURSORS initialization parameter in the Oracle database is recommended.

D.3.8 HS_RPC_FETCH_REBLOCKING

Property

Description

Default value

ON

Range of values

OFF or ON

Controls whether Heterogeneous Services attempts to optimize performance of data transfer between the Oracle database and the Heterogeneous Services agent connected to the non-Oracle data store.

The following values are possible:

- OFF disables reblocking of fetched data so that data is immediately sent from agent to server.

- ON enables reblocking, which means that data fetched from the non-Oracle system is buffered in the agent and is not sent to the Oracle database until the amount of fetched data is equal or higher than the value of HS_RPC_FETCH_SIZE initialization parameter. However, any buffered data is returned immediately when a fetch indicates that no more data exists or when the non-Oracle system reports an error.

D.3.9 HS_RPC_FETCH_SIZE

Property

Description

Default value

50000

Range of values

1 to 10000000

Tunes internal data buffering to optimize the data transfer rate between the server and the agent process.

Increasing the value can reduce the number of network round-trips needed to transfer a given amount of data, but also tends to increase data bandwidth and to reduce latency as measured between issuing a query and completion of all fetches for the query. Nevertheless, increasing the fetch size can increase latency for the initial fetch results of a query, because the first fetch results are not transmitted until additional data is available.

D.3.10 HS_TIME_ZONE

Property

Description

Default value for '[+|-]hh:mm'

Derived from the NLS_TERRITORY initialization parameter

Range of values for '[+|-]hh:mm'

Any valid datetime format mask

Specifies the default local time zone displacement for the current SQL session. The format mask, [+|-]hh:mm, is specified to indicate the hours and minutes before or after UTC (Coordinated Universal Time—formerly Greenwich Mean Time). For example:

HS_TIME_ZONE = [+ | -] hh:mm

D.3.11 HS_TRANSACTION_MODEL

Property

Description

Default Value

SINGLE_SITE

Range of Values

READ_ONLY, SINGLE_SITE

Specifies the type of transaction model that is used when the non-Oracle database is updated by a transaction.

The following values are possible:

- READ_ONLY provides read access to the non-Oracle database.

- SINGLE_SITE provides read and write access to the non-Oracle database. However, the gateway cannot participate in distributed updates.

D.3.12 IFILE

Property

Description

Default value

None

Range of values

Valid parameter file names

Use the IFILE initialization parameter to embed another initialization file within the current initialization file. The value should be an absolute path and should not contain environment variables. The three levels of nesting limit does not apply.

See Also:
Oracle Database Reference

D.3.13 HS_FDS_CONNECT_INFO

Property

Description

Default Value

None

Range of Values

Not applicable

HS_FDS_CONNECT_INFO which describes the connection to the non-Oracle system.

The default initialization parameter file already has an entry for this parameter. The syntax for HS_FDS_CONNECT_INFO for the gateway is as follows:

HS_FDS_CONNECT_INFO=dsn_value

where, dsn_value on Windows, is the name of the system DSN defined in the Windows ODBC Data Source Administrator and on UNIX, it is data source name configured in the odbc.ini file.

The entry for dsn_value is case sensitive.

D.3.14 HS_FDS_DEFAULT_OWNER

Property

Description

Default Value

None

Range of Values

Not applicable

The name of the table owner that is used for the non-Oracle database tables if an owner is not specified in the SQL statements.

Note:
If this parameter is not specified and the owner is not explicitly specified in the SQL statement, then the user name of the Oracle user or the user name specified when creating the database link is used.

D.3.15 HS_FDS_TRACE_LEVEL

Property

Description

Default Value

OFF

Range of values

OFF, ON, DEBUG

Specifies whether error tracing is turned on or off for gateway connectivity.

The following values are valid:

- OFF disables the tracing of error messages.

- ON enables the tracing of error messages that occur when you encounter problems. The results are written by default to a gateway log file in LOG directory where the gateway is installed.

- DEBUG enables the tracing of detailed error messages that can be used for debugging.

D.3.16 HS_FDS_SHAREABLE_NAME

Property

Description

Default Value

None

Range of Values

Not applicable

Specifies the full path name to the ODBC driver manager.

This is a required parameter, whose format is:

HS_FDS_SHAREABLE_NAME=odbc_installation_path/lib/libodbc.sl

Where:

odbc_installation_path is the path where the ODBC driver is installed.

This parameter applies only to UNIX based platforms.

D.3.17 HS_FDS_FETCH_ROWS

Property

Description

Default Value

100

Range of Values

Any integer between 1 and 1000

Syntax

HS_FDS_FETCH_ROWS=num

HS_FDS_FETCH_ROWS specifies the fetch array size. This is the number of rows to be fetched from the non-Oracle database and to return to Oracle database at one time. This parameter will be affected by the HS_RPC_FETCH_SIZE and HS_RPC_FETCH_REBLOCKING parameters.

Index
A  C  D  E  F  G  H  I  K  O  P  R  S  T  U  V  W

A

ALTER statement, B.1

C

character sets

Heterogeneous Services, D.3.5.1

CONNECT BY clause, 2.2.2.2 CREATE statement, B.1

D

data definition language, B.1

data dictionary

contents with Oracle Database Gateway for ODBC, C.2

mapping for Oracle Database Gateway for ODBC, C.2.1

Oracle database name/SQL Server name, C.2.1

translation support for Oracle Database Gateway for ODBC, C

data dictionary views

Oracle Database Gateway for ODBC, C.2

data type

VARBINARY, 2.3.1

DELETE statement, B.1.1 describe cache high water mark

definition, D.3.4

drivers

ODBC, 1.5

DROP statement, B.1

E

Encrypted format login, 2.3.1

Error messages

error tracing, D.3.15

F

fetch array size, with HS_FDS_FETCH_ROWS, D.3.17

G

gateway

pass-through feature, 2.1

supported functions, B

supported SQL syntax, B.1

globalization support

Heterogeneous Services, D.3.5

GRANT statement, B.1

H

Heterogeneous Services

defining maximum number of open cursors, D.3.7

optimizing data transfer, D.3.8

Oracle Database Gateway for ODBC

architecture, 1.4

definition, 1.3

non-Oracle data dictionary access, C.1

ODBC connectivity requirements, 1.5

supported functions, B.2

supported SQL syntax, B.1

supported tables, C.2

setting global name, D.3.3 specifying cache high water mark, D.3.4 tuning internal data buffering, D.3.9 tuning LONG data transfer, D.3.6 HS_DB_NAME initialization parameter, D.3.3 HS_DESCRIBE_CACHE_HWM initialization parameter, D.3.4 HS_FDS_CONNECT_INFO, D.3.13 HS_FDS_DEFAULT_OWNER initialization parameter, D.3.14 HS_FDS_FETCH_ROWS parameter, D.3.17 HS_FDS_SHAREABLE_NAME initialization parameter, D.3.16 HS_FDS_TRACE_LEVEL initialization parameter, D.3.15

enabling agent tracing, D.1

HS_LANGUAGE initialization parameter, D.3.5 HS_LONG_PIECE_TRANSFER_SIZE initialization parameter, D.3.6 HS_OPEN_CURSORS initialization parameter, D.3.7 HS_RPC_FETCH_REBLOCKING initialization parameter, D.3.8 HS_RPC_FETCH_SIZE initialization parameter, D.3.9 HS_TIME_ZONE initialization parameter, D.3.10

I

IFILE initialization parameter, D.3.12

Initialization parameter file

customizing, D

INSERT statement, B.1.2

K

Known restrictions, 2.2

O

ODBC agents

connectivity requirements, 1.5

functions, 1.5

ODBC connectivity

data dictionary mapping, C.2.1

ODBC driver, 1.5

requirements, 1.5

specifying path to library, D.3.16

OLE DB connectivity

data dictionary mapping, C.2.1

Oracle Database Gateway for ODBC

architecture, 1.4

Oracle and non-Oracle on same machine, 1.4.2

Oracle and non-Oracle on separate machines, 1.4.1

data dictionary

translation support, C

definition, 1.3 DELETE statement, B.2 INSERT statement, B.2 non-Oracle data dictionary access, C.1 ODBC connectivity requirements, 1.5 supported functions, B.2 supported SQL syntax, B.1 UPDATE statement, B.2

P

parameters

gateway initialization file

HS_FDS_FETCH_ROWS, D.3.17

R

ROWID, 2.2.2.1, 2.2.2.3, 2.2.2.4

S

SELECT statement, B.1.3

accessing non-Oracle system, C.1

T

TRUNCATE statement, B.1

U

unsupported functions

Oracle Database Gateway for ODBC, B.2

UPDATE statement, B.1.4

V

VARBINARY data type, 2.3.1

W

WHERE CURRENT OF clause, 2.2.2.1

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