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.
High-Performance Loader User's Guide
The describes how to use the HCL Informix® to load and unload large quantities of data efficiently to or from Informix databases.
Manage the High-Performance Loader
HPL performance
You can improve the HPL performance by preparing an environment that is optimized for the particular load or unload job that you are performing.
HPL performance hints
In general, the performance of the depends on the underlying hardware resources: CPU, memory, disks, tapes, controllers, and so on. Any of these resources could be a bottleneck, depending on the speed of the resource, the load on the resource, and the particular nature of the load or unload.
Ensure enough memory
To maximize available memory and scan resources, the automatically sets the PDQPRIORITY environment variable to 100, if it is not already set. If the PDQPRIORITY environment variable is set, HPL uses that value.

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.
- 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
    The HCL® Informix® Administrator's Guide provides the information required to administer HCL Informix.
  - Administrator's Reference
    The HCL® Informix® Administrator's Reference includes 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
    The HCL® Informix® DB-Access User's Guide describes how to use the utility to access, modify, and retrieve information from HCL Informix database servers.
  - High-Performance Loader User's Guide
    The describes how to use the HCL Informix® to load and unload large quantities of data efficiently to or from Informix databases.
    - High-Performance Loader overview
    - Examples of loading and unloading jobs using the ipload utility
      This section shows how the components of the fit together. The section includes a step-by-step tutorial with two examples (for a load and an unload job) that use the ipload graphical user interface (GUI).
    - The ipload utility windows
      This section contains information about using the ipload utility.
    - Define HPL projects
      This section explains how to create a project and how projects are related. The individual components that you store in projects are described in later sections.
    - Configure the High-Performance Loader
      This section describes the process of configure the .
    - Define device arrays
      This section describes how to define and use device arrays with the .
    - Define formats
      This section describes the formats that the provides and shows how to prepare and edit the format component.
    - Define queries
      This section describe how to define queries including how to create, edit, and export and import queries.
    - Define maps
      This section describes how to define maps with the . It also describes the options that are available for defining maps.
    - Define filters
      This section describes how to create, edit, and delete filters.
    - Unload data from a database
      This section describes the Unload Job window.
    - Load data to a database table
      This section describes the load process.
    - The Generate options of the ipload utility
      This section describes the Generate options for the ipload utility.
    - The HPL browsing options
      This section describes the browsing options that are available for the .
    - Manage the High-Performance Loader
      - Manage modes, errors, and performance
        When you manage the , you manage modes, violations (errors), and performance. You also need to avoid the limitation that occurs when using an Excalibur Text module index
      - HPL modes
        The offers two load modes, deluxe mode and express mode, and one unload mode. The express mode is faster, and the deluxe mode is more flexible.
      - HPL load and unload errors
        When you load records from a data file, some of the records might not meet the criteria that you established for the database table.
      - HPL performance
        You can improve the HPL performance by preparing an environment that is optimized for the particular load or unload job that you are performing.
        The onpload configuration parameters
        The onpload configuration parameters control the number of threads that onpload starts and the number and size of the buffers that are used to transfer data.
        Express-mode limitations
        The onstat options for onpload
        The onstat utility has two options that you can use to observe the behavior of database server threads during express-mode loads.
        Devices for the device array
        On a data-load job, each device runs independently of other devices. Thus mixing fast and slow devices does not adversely affect the speed of the load.
        HPL usage tasks
        Settings for a no-conversion load or unload job
        A no-conversion load or unload is not highly CPU intensive because no conversion is involved. In this case, the load or unload is expected to be limited by the speed of the tape devices. No-conversion loads and unloads are always completed in express mode.
        An express-mode load with delimited ASCII
        In an express-mode load with delimited ASCII, the load or unload job is limited by the available CPU. The conversion to or from HCL Informix® types to ASCII is the most expensive portion of these operations
        HPL performance hints
        In general, the performance of the depends on the underlying hardware resources: CPU, memory, disks, tapes, controllers, and so on. Any of these resources could be a bottleneck, depending on the speed of the resource, the load on the resource, and the particular nature of the load or unload.
        Choose an efficient format
        When you load data to or unload data from a source that is not HCL Informix®, you can use fixed or delimited format in an appropriate code set such as ASCII or EBCDIC.
        Ensure enough converter threads and VPs
        Loads and unloads other than raw and fast-format ones are likely to be CPU intensive due to conversion overhead. In such cases, conversion speed is likely to determine the load or unload speed. It is thus important to use sufficient conversion resources (that is, enough converter threads and VPs).
        Ensure enough memory
        To maximize available memory and scan resources, the automatically sets the PDQPRIORITY environment variable to 100, if it is not already set. If the PDQPRIORITY environment variable is set, HPL uses that value.
        Ensure enough buffers of adequate size
        You set the size and number of buffers in the plconfig configuration file with the onpload utility.
        Increase the commit interval
      - Limitation when using the Excalibur Text Module indexes
        You cannot create a load job with multiple devices to insert rows into a table that has an Excalibur Text module index. A multiple-device load fails because the Excalibur Text module does not handle concurrency correctly.
    - The onpload utility
      This section describes how to use the onpload utility.
    - The onpladm utility
      This section describes how to use the onpladm utility.
    - Appendixes
      This section contains additional reference information.
  - Performance Guide
    The HCL® Informix® Performance Guide describes how to configure and operate your HCL Informix database server to improve overall system throughput and to improve the performance of SQL queries.
  - SNMP Subagent Guide
    The describes 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.
- Backup and Restore Guide
  The HCL® Informix® Backup and Restore Guide describes how to use the HCL Informix 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
  The describes 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 15.0.0 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.
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.

Ensure enough memory

To maximize available memory and scan resources, the automatically sets the PDQPRIORITY environment variable to 100, if it is not already set. If the PDQPRIORITY environment variable is set, HPL uses that value.

If the PDQPRIORITY environment variable is set to 0 or if the PDQPRIORITY environment variable is disabled on the database server, then HPL cannot unload multiple devices.