Welcome
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.
Informix® Warehouse Accelerator
The IBM® Informix® Warehouse Accelerator Administration Guide includes information about installing and configuring the accelerator server, creating data marts, accelerators, and accelerated query tables (AQTs).
Configuration
You must configure the accelerator server to work with the Informix® database server.

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.
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.
- Dimensional databases
  The IBM® Informix® Data Warehouse Guide provides information to help you design, implement, and manage dimensional databases, and describes the tools that you can use to create data warehouses and optimize your data warehouse queries.
- Informix® Warehouse Accelerator
  The IBM® Informix® Warehouse Accelerator Administration Guide includes information about installing and configuring the accelerator server, creating data marts, accelerators, and accelerated query tables (AQTs).
  - Overview of
    is a product that you use to improve the performance of your warehouse queries.
  - Installation
    You can install on the same computer as the Informix® database server, on a separate computer, or on a cluster (including a high-availability cluster).
  - Configuration
    You must configure the accelerator server to work with the Informix® database server.
    - Configuring Informix® Warehouse Accelerator
      You must configure the before you can enable query acceleration and set up the connection between the accelerator server and the database server.
    - Configuring Informix® Warehouse Accelerator for hardware clusters
      You must configure before you can enable query acceleration and set up the connection between the accelerator server and the database server. In a cluster system, one accelerator server coordinator node uses the first cluster node, and then each cluster node that you add to the cluster becomes an accelerator server worker node.
    - Configuring on secondary servers in a high-availability environment
      You can create data marts, load data mart data, and accelerate queries on one or more secondary servers in a high-availability cluster. By using secondary servers for , you have greater flexibility in a mixed-workload environment. For example, you can dedicate the primary server for OLTP transactions and use a secondary server for processing the warehouse analytic queries. Configure the secondary servers by modifying the ONCONFIG file of each secondary server, connecting one of the secondary servers to an accelerator, and copying the sqlhosts entry in the sqlhosts file to each server in the cluster.
    - dwainst.conf configuration file
      The dwainst.conf configuration file contains the parameters that are used to configure the accelerator server.
    - Configuring memory for Informix® Warehouse Accelerator
      To process queries efficiently, verify that you have the optimal configuration for the operating-system kernel parameters, shared memory, and swap space on the computer where is installed. You can also monitor the virtual memory usage to see if you need to reduce the total size of the loaded data marts or add physical memory.
    - The ondwa utility
      Use the ondwa utility to set up and work with the accelerator server.
  - Create an accelerator
    You create an accelerator by connecting the Informix® database server to the accelerator server.
  - Data marts and AQTs
    For efficient query processing, the accelerator server must have its own copy of the data. The data is stored in logical collections of related data, or data marts. A data mart specifies the collection of tables that are loaded into an accelerator and the relationships, or references, between these tables.
  - Turning on query acceleration
    Before queries can be routed to the accelerator server for processing, you must set the use_dwa session environment variable.
  - SQL administration routines
    You can use the functions and procedures from the command line or in an application to automate administration tasks.
  - Reversion requirements for Informix Warehouse Accelerator
  - Troubleshooting
  - Sample warehouse schema
    The examples use this sample warehouse schema.
  - Sysmaster interface (SMI) pseudo tables for query probing data
    The SMI tables provide a way to access probing data in a relational form, which is most convenient for further processing.
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.

Configuration

You must configure the accelerator server to work with the Informix® database server.

After you install , there are several configuration steps that you must complete before it can accelerate queries.