Welcome
Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
System administration
These topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL Informix® database servers.
Performance Guide
These topics describe how to configure and operate your HCL Informix® database server to improve overall system throughput and to improve the performance of SQL queries.
Effect of configuration on CPU utilization
The combination of operating-system and Informix® configuration parameters can affect CPU utilization. You can change the settings of the Informix configuration parameters that directly affect CPU utilization, and you can adjust the settings for different types of workloads.
Connections and CPU utilization
Some applications have a large number of client/server connections. Opening and closing connections can consume a large amount of system CPU time.
MaxConnect for multiple connections UNIX™
HCL Informix® MaxConnect is a networking product for Informix database server environments on UNIX™. You can use Informix MaxConnect to manage large numbers (from several hundred to tens of thousands) of client/server connections. Informix MaxConnect is best for OLTP data transfers, but is not recommended for large multimedia data transfers.

HCL Informix® V15.0 documentation
Welcome to the documentation for HCL Informix® 15.0 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 DataBlade® modules.
Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
- System administration
  These topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL Informix® database servers.
  - List of utilities
    HCL Informix® includes utilities and applications that you can use to perform administrative tasks and capture information about configuration and performance.
  - Administrator's Guide
    These topics provide the information required to administer HCL Informix®.
  - Administrator's Reference
    These topics include comprehensive descriptions of HCL Informix® configuration parameters, the system-monitoring interface (SMI) tables in the sysmaster database, the syntax of database server utilities such as onmode and onstat, logical-log records, disk structures, event alarms, and unnumbered error messages.
  - DB-Access User's Guide
    This publication describes how to use the DB-Access utility to access, modify, and retrieve information from HCL® Informix® database servers.
  - High-Performance Loader User's Guide
    These topics describe how to use the HCL Informix® High-Performance Loader (HPL) to load and unload large quantities of data efficiently to or from Informix databases.
  - Performance Guide
    These topics describe how to configure and operate your HCL Informix® database server to improve overall system throughput and to improve the performance of SQL queries.
    - Performance basics
      Performance measurement and tuning issues and methods are relevant to daily database server administration and query execution.
    - Performance monitoring and the tools you use
      You can use performance monitoring tools to create a performance history, to monitor database resources at scheduled times, or to monitor ongoing transaction or query performance.
    - Effect of configuration on CPU utilization
      The combination of operating-system and Informix® configuration parameters can affect CPU utilization. You can change the settings of the Informix configuration parameters that directly affect CPU utilization, and you can adjust the settings for different types of workloads.
      - UNIX™ configuration parameters that affect CPU utilization
        Your database server distribution includes a machine notes file that contains recommended values for UNIX™ configuration parameters. Because the UNIX parameters affect CPU utilization, you should compare the values in the machine notes file with your current operating-system configuration.
      - Windows™ configuration parameters that affect CPU utilization
        The Informix® distribution includes a machine notes file that contains recommended values for Informix configuration parameters on Windows™. Compare the values in this file with your current ONCONFIG configuration file settings.
      - Configuration parameters and environment variables that affect CPU utilization
        Some configuration parameters and environment variables affect CPU utilization. You might need to adjust the settings of these parameters and variables when you consider methods of improving performance.
      - Network buffer pools
        The sizes of buffers for TCP/IP connections affect memory and CPU utilization. Sizing these buffers to accommodate a typical request can improve CPU utilization by eliminating the need to break up requests into multiple messages.
      - Virtual processors and CPU utilization
        While the database server is online, you can start and stop virtual processors (VPs) that belong to certain classes.
      - Connections and CPU utilization
        Some applications have a large number of client/server connections. Opening and closing connections can consume a large amount of system CPU time.
        Multiplexed connections and CPU utilization
        Many traditional nonthreaded SQL client applications use multiple database connections to perform work for a single user. Each database connection establishes a separate network connection to the database server. The multiplexed connection facility provides the ability for one network connection in the database server to handle multiple database connections from a client application.
        MaxConnect for multiple connections UNIX™
        HCL Informix® MaxConnect is a networking product for Informix database server environments on UNIX™. You can use Informix MaxConnect to manage large numbers (from several hundred to tens of thousands) of client/server connections. Informix MaxConnect is best for OLTP data transfers, but is not recommended for large multimedia data transfers.
    - Effect of configuration on memory utilization
      The combination of operating-system and Informix® configuration parameters can affect memory utilization.
    - Effect of configuration on I/O activity
      The configuration of your database server affects I/O activity.
    - Table performance considerations
      Some performance issues are associated with unfragmented tables and table fragments.
    - Boosted Partition Free Space Caches (PFSC)
    - Indexes and index performance considerations
      Informix® provides several types of indexes. Some performance issues are associated with indexes.
    - Locking
      The database server uses locks, which can affect concurrency and performance. You can monitor and administer locks.
    - Fragmentation guidelines
      One of the most frequent causes of poor performance in relational database systems is contention for data that resides on a single I/O device. Proper fragmentation of high-use tables can significantly reduce I/O contention. These topics discuss the performance considerations that are involved when you use table fragmentation.
    - Queries and the query optimizer
      These topics describe query plans, explain how the database server manages query optimization, and discuss factors that you can use to influence the query plan. These topics also describe performance considerations for SPL routines, the UDR cache, and triggers.
    - Optimizer directives
      Optimizer directives are comments that tell the query optimizer how to execute a query. You can use optimizer directives to improve query performance.
    - Parallel database query (PDQ)
      You can manage how the database server performs PDQ and you can monitor the resources that the database server uses for PDQ.
    - Improving individual query performance
      You can test, monitor, and improve queries.
    - The onperf utility on UNIX
      The onperf utility is a windowing environment that you can use to monitor the database server performance. The onperf utility monitors the database server running on the UNIX™ operating system.
    - Appendix
  - SNMP Subagent Guide
    These topics describe the Simple Network Management Protocol (SNMP) and the software that you need to use SNMP to monitor and manage HCL Informix® database servers and databases.
  - InformixHQ Guide
    InformixHQ is a modern web console for visualizing, monitoring, and managing your Informix server instances. It is purpose built for ease-of-use, scaling out, and optimizing DevOps needs. It provides critical performance management capabilities, monitoring how key performance metrics are changing over time and tracking how efficiently Informix is running your workload even when you’ve stepped away from your screen. Its monitoring system feeds directly into a customizable alerting system so you can be immediately alerted via email, Twilio, or PagerDuty whenever an issue occurs on one of your Informix database server instances. InformixHQ is designed to be scalable to efficiently manage and monitor as many Informix database server instances as you need. Moreover, it's a tool that can be shared by the DBAs, the app developers, the ops engineers, and management and accessed from any desktop, laptop, or mobile device. InformixHQ is the centralized hub for graphical monitoring, alerting, and administration of your Informix database servers.
- Backup and Restore Guide
  These topics describe how to use the HCL® Informix® ON-Bar and ontape utilities to back up and restore database server data. These utilities enable you to recover your databases after data is lost or becomes corrupted due to hardware or software failure or accident.
- Enterprise Replication
  These topics describe the concepts of data replication using HCL Informix® Enterprise Replication, including how to design your replication system, as well as administer and manage data replication throughout your enterprise.
Migrating and upgrading
You can upgrade to the 15.0 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 DataBlade® 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.

MaxConnect for multiple connections UNIX™

HCL Informix® MaxConnect is a networking product for Informix® database server environments on UNIX™. You can use Informix® MaxConnect to manage large numbers (from several hundred to tens of thousands) of client/server connections. Informix® MaxConnect is best for OLTP data transfers, but is not recommended for large multimedia data transfers.

Informix® MaxConnect provides the following performance advantages for medium to large OLTP configurations:

Reduces CPU requirements on the database server by reducing the number of physical connections.
Informix® MaxConnect multiplexes connections so that the ratio of client connections to database connections can be 100:1 or higher.
Improves end-user response time by increasing system scalability to many thousands of connections
Reduces operating-system overhead by aggregating multiple small packets into one transfer operation

To obtain maximum performance benefit, install Informix® MaxConnect on either a dedicated computer to which Informix® clients connect or on the client application server. Either of these configurations offloads the CPU requirements of handling a large number of connections from the database server computer.

To monitor Informix® MaxConnect, use the onstat -g imc command on the database server computer and use the imcadmin command on the computer where Informix® MaxConnect is located.

For more information about installing, configuring, monitoring, and tuning Informix® MaxConnect, see the IBM® Informix® MaxConnect User's Guide.

Important: Informix® MaxConnect and the IBM® Informix® MaxConnect User's Guide ship separately from HCL Informix®.