Welcome
Client APIs and tools
You can use the HCL Informix® implementation of client APIs to develop applications for Informix database servers.
.NET provider options
The HCL Data Server Provider for .NET IBM® DB2® provider option is the preferred Informix® provider for developing new applications.
Informix® .NET Provider Guide
The IBM® Informix® .NET Provider Reference Guide contains the information you need in order to use the Informix .NET Provider to access and manipulate data in HCL Informix databases.
Overview of HCL Informix® .NET Provider
The topics in this overview describe the Informix® .NET Provider and provide information on the environment in which to use it. These topics also provide installation and connection information and general information to help you get started using the Informix .NET Provider.
Distributed transactions
Your application can enlist a connection for distributed transactions by setting the Enlist connection string attribute to true, yes, or 1.

HCL Informix® V15.0.0 documentation
Welcome to the documentation for HCL Informix® 15.0.0 and related client tools and products.
Product overview
HCL Informix® is a fast and scalable database server that manages traditional relational, object-relational, and dimensional databases. Its small footprint and self-managing capabilities are suited to embedded data-management solutions.
Installing
These topics describe how to install HCL Informix® database servers, client products, and modules.
Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
Migrating and upgrading
You can upgrade to the 15.0.0 release of HCL Informix® or migrate from other database servers to Informix. Upgrading is an in-place migration method that uses your existing hardware and operating system software. Some changes to the Informix database server can affect upgrading from a previous release.
Client APIs and tools
You can use the HCL Informix® implementation of client APIs to develop applications for Informix database servers.
- Change Data Capture API Programmer's Guide
  The HCL® Informix® Change Data Capture API Programmer's Guide describes how to program applications to process changed data from HCL Informix databases using the HCL Informix Change Data Capture API.
- Embedded SQLJ for HCL Informix®
  The HCL® Informix® Embedded SQLJ User's Guide contains information about using IBM Informix Embedded SQLJ.
- ESQL/C Guide
  The HCL® Informix® Enterprise Replication Guide explains how to use , the Informix implementation of Embedded Structured Query Language (SQL) for C (ESQL/C), to create client applications with database-management capabilities.
- GLS User's Guide
  The HCL® Informix® GLS User's Guide describes the Global Language Support (GLS) feature available in HCL Informix products.
- Informix GLS API
  The Informix GLS API Programmer's Guide describes the global language support (GLS) application programming interface (API) available in Informix® ESQL/C and HCL Informix modules.
- Informix® Object Interface for C++ Guide
  The Informix® Object Interface for C++ Programmer's Guide describes how to develop HCL Informix client applications by using the object-oriented C++ programming language.
- Informix® ODBC Driver Guide
  The Informix® ODBC Driver Programmer's Manual serves as a user guide and reference for HCL Informix ODBC Driver, which is the Informix implementation of the Microsoft™ Open Database Connectivity (ODBC) interface, Version 3.0.
- .NET provider options
  The HCL Data Server Provider for .NET IBM® DB2® provider option is the preferred Informix® provider for developing new applications.
  - Differences between .NET Providers
  - Informix® .NET Provider Guide
    The IBM® Informix® .NET Provider Reference Guide contains the information you need in order to use the Informix .NET Provider to access and manipulate data in HCL Informix databases.
    - Overview of HCL Informix® .NET Provider
      The topics in this overview describe the Informix® .NET Provider and provide information on the environment in which to use it. These topics also provide installation and connection information and general information to help you get started using the Informix .NET Provider.
      - What is the Informix® .NET Provider?
        The Informix® .NET Provider is a .NET assembly that lets .NET applications access and manipulate data in Informix databases. It does this by implementing several interfaces in the Microsoft™ .NET Framework that are used to access data from a database.
      - Supported programming environments
        The Informix® .NET Provider can be used by any application that can be run by the Microsoft™ .NET Framework.
      - Support for IPv6
        The Informix® .NET Provider can use Internet Protocol Version 6 (IPv6) addresses, as well as Internet Protocol Version 4 (IPv4) addresses.
      - Installing the HCL Informix® .NET Provider
        You can install the Informix® .NET Provider with the HCL® Informix Client Software Development Kit (Client SDK) through a typical or custom installation.
      - Overview of the .NET provider class library
        The Informix® .NET Provider supports all of the .NET public classes and base classes that are needed to access the Informix database.
      - Thread-safety of provider types
        Only static members of the Informix® .NET Provider type are thread-safe.
      - Connecting to a database
        You connect to a database by using the Open method of an IfxConnection object.
      - The ? parameter markers
        You can use the question mark symbol (?) to mark a parameter's place in an SQL statement or stored procedure.
      - Call stored procedures
        To use stored procedures in your applications, you must set some properties of the IfxCommand object.
      - IfxProviderFactory objects to write database-independent code
        Starting with Informix® .NET Provider Version 2, you can use the IfxProviderFactory class to write database-independent code.
      - Distributed transactions
        Your application can enlist a connection for distributed transactions by setting the Enlist connection string attribute to true, yes, or 1.
      - The OUT and INOUT Parameters
        As of Version 3.50.xC4, HCL Informix® Client Software Development Kit supports the use of OUT and INOUT parameters during execution of SPL.
      - Generic coding with the ADO.NET common base classes
        The .NET Framework features a namespace that is called the System.Data.Common namespace, which contains a set of base classes that can be shared by any .NET data provider.
      - Error messages
        Error messages from the HCL Informix® server are represented as Informix .NET Provider exceptions.
    - Mapping data types
      These topics describe how data types are mapped between HCL Informix® databases and the .NET Framework.
    - Type reference
      All of the classes described in these topics belong in the namespace IBM.Data.Informix.
    - Sample programs
  - Informix .NET Core Provider
    Starting with CSDK 4.50.xC4, Informix .NET Core Provider built with .NET Core SDK/Runtime v3.1 is shipped for Windows x64 and Linux x86_64 platforms.
  - Informix® .NET EF Core Provider Guide
- HCL Informix 4GL
  This topic provides a link to the Informix 4GL documentation.
- Informix® JDBC Driver Guide
  The HCL® Informix® JDBC Driver Programmer's Guide describes how to install, load, and use HCL Informix JDBC Driver to connect to the Informix database from within a Java™ application or applet.
- Informix International Language Supplement (ILS) User Guide
  These topics include information about the translated user interface files for Informix® UNIX™ products, locales, and code set conversion tables
- Informix® OLE DB Provider Guide
  The HCL Informix OLE DB Provider Programmer's Guide describes the software requirements for using HCL Informix® OLE DB Provider, show how to install and configure the provider for your use, and explain how to use Informix OLE DB Provider to enable client applications, such as ActiveX Data Object (ADO) applications and web pages, to access data on the Informix server.
Embedding Informix®
When you embed HCL Informix®, you can use enterprise-class high-availability and high performance with embeddability features such as easy programmability, a small disk and memory footprint, and silent deployment.
Extending Informix®
Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix includes many built-in extensions that are fully integrated in the database server. Informix also provides modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix.
Data warehousing
In addition to designing and implementing Informix® dimensional databases, you can use tools to create data warehouse applications and optimize your data warehouse queries.
Designing databases
The first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
JSON compatibility
You can use the popular JSON-oriented query language created by MongoDB to interact with data stored in HCL Informix®.
Security
You can secure your Informix® database server and the data that is stored in your Informix databases. You can encrypt data, secure connections, control user privileges and access, and audit data security.
SQL programming
You can use the HCL Informix® implementation of the SQL language to develop applications for Informix database servers.
Troubleshooting HCL Informix®
Several troubleshooting techniques, tools, and resources are available for resolving problems that you encounter in your HCL Informix® database server environment.

Distributed transactions

Your application can enlist a connection for distributed transactions by setting the Enlist connection string attribute to true, yes, or 1.

You should set the Pooling connection string attribute to true, yes, or 1 while working with distributed transactions.

Distributed transactions includes an example of how to use distributed transactions with your application.

Distributed transactions are supported through the Microsoft™ Distributed Transaction Coordinator (MS DTC). The MS DTC components are required to call some unmanaged code, which can affect the level of security available and potentially degrade performance.