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# Preface

The Oracle Big Data Connectors User's Guide describes how to install and use Oracle Big Data Connectors:

- Oracle Loader for Hadoop

- Oracle SQL Connector for Hadoop Distributed File System

- Oracle XQuery for Hadoop

- Oracle Data Integrator Application Adapter for Hadoop

- Oracle R Advanced Analytics for Hadoop

## Audience

This document is intended for users of Oracle Big Data Connectors, including the following:

- Application developers

- Java programmers

- XQuery programmers

- System administrators

- Database administrators

## Documentation Accessibility

For information about Oracle's commitment to accessibility, visit the Oracle Accessibility Program website at `http://www.oracle.com/pls/topic/lookup?ctx=acc&id=docacc`.

Access to Oracle Support

Oracle customers have access to electronic support through My Oracle Support. For information, visit `http://www.oracle.com/pls/topic/lookup?ctx=acc&id=info` or visit `http://www.oracle.com/pls/topic/lookup?ctx=acc&id=trs` if you are hearing impaired.

## Related Documents

For more information, see the following documents:

- Oracle Loader for Hadoop Java API Reference

- Oracle Fusion Middleware Application Adapters Guide for Oracle Data Integrator

- Oracle Big Data Appliance Software User's Guide.

## Text 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.

## Syntax Conventions

The syntax is presented in a simple variation of Backus-Naur Form (BNF) that uses the following symbols and conventions:

Symbol or Convention | Description
--- | ---
[ ] | Brackets enclose optional items.
{ } | Braces enclose a choice of items, only one of which is required.
| | A vertical bar separates alternatives within brackets or braces.
... | Ellipses indicate that the preceding syntactic element can be repeated.
delimiters | Delimiters other than brackets, braces, and vertical bars must be entered as shown.