Welcome
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.
Change Data Capture records
The Change Data Capture (CDC) records are returned by smart large object read functions and contain the captured data and information about the transaction currently being captured.
Format of CDC records
The (CDC) records contain a header that is common to all records, followed by a specific header for the type of CDC record.

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.
  - Getting started with the Change Data Capture API
    These topics describe the API and how to use it.
  - Change Data Capture functions
    These topics describe the functions.
  - Change Data Capture records
    The Change Data Capture (CDC) records are returned by smart large object read functions and contain the captured data and information about the transaction currently being captured.
    - Format of CDC records
      The (CDC) records contain a header that is common to all records, followed by a specific header for the type of CDC record.
    - The CDC_REC_BEGINTX record
      Indicates the beginning of a transaction.
    - The CDC_REC_COMMTX record
      Indicates that a transaction has been committed.
    - The CDC_REC_DELETE record
      Provides the row that was removed as a result of a DELETE operation.
    - The CDC_REC_DISCARD record
      Indicates that some operations of the transaction should be discarded.
    - The CDC_REC_ERROR record
      Indicates that an error occurred and the session is no longer valid.
    - The CDC_REC_INSERT record
      Provides the row that resulted from an INSERT operation.
    - The CDC_REC_RBTX record
      Indicates that the transaction has been rolled back.
    - The CDC_REC_TABSCHEMA record
      Describes the table from which data is being captured.
    - The CDC_REC_TIMEOUT record
      Indicates that the read call did not return data before the timeout period specified in the cdc_opensess() function.
    - The CDC_REC_TRUNCATE record
      Indicates that a TRUNCATE operation was performed on a table.
    - The CDC_REC_UPDAFT record
      Provides the image of a row after an UPDATE operation.
    - The CDC_REC_UPDBEF record
      Provides the image of a row before an UPDATE operation.
  - The syscdc system database
    The syscdc system database contains tables that store information about the API.
  - Change Data Capture error codes
    If a function encounters a problem, it returns an error code. Most functions return 0 if they succeed.
  - onstat -g cdc
    Monitors the sessions involved in change data capture.
  - Change Data Capture sample program
    The Change Data Capture sample program provides an example of using the API to capture and process data.
  - Informix Change Streams API for Java
    This topic demonstrates how to use the Informix Change Streams API to create data streams and capture changing data from the server using the Java programming language.
- 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.
- 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.

Format of CDC records

The (CDC) records contain a header that is common to all records, followed by a specific header for the type of CDC record.

The CDC_REC_INSERT, CDC_REC_DELETE, CDC_REC_UPDBEF, and CDC_REC_UPDAFT records also contain column data.

The header common to all CDC records describes the size and type of the CDC record.

Table 1. The header common to all CDC records
Section	Size	Description
Header size	4 bytes	The number of bytes in the common and CDC record-specific headers.
Payload size	4 bytes	The number of bytes of data in the record after the common and CDC record-specific headers.
Packet scheme	4 bytes	The packetization scheme number of one of the packetization schemes contained in the syscdcpacketschemes table. The only packetization scheme is `66`, CDC_PKTSCHEME_LRECBINARY.
Record number	4 bytes	The record number of one of the CDC records contained in the syscdcrectypes table.