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.
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.
Configuring and monitoring Informix®
The sysmaster database
These topics describe the sysmaster database and provide reference information for the system-monitoring interface (SMI).
The System-Monitoring Interface Tables
The sysmaster database contains many tables that you can use to monitor your system.
sysdual

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.
    - Configuring and monitoring Informix®
      - Database configuration parameters
        The Informix® database server uses a configuration file, which is called the onconfig file, during initialization. This file contains default configuration parameter values. You can modify the parameter values to improve performance and other characteristics of the instance or database.
      - The sysmaster database
        These topics describe the sysmaster database and provide reference information for the system-monitoring interface (SMI).
        The sysmaster Database
        The System-Monitoring Interface
        The System-Monitoring Interface Tables
        The sysmaster database contains many tables that you can use to monitor your system.
        The sysutils Tables
        sysadtinfo
        sysaudit
        syschkio
        The syschkio system-monitoring interface table provides I/O statistics for individual chunks that the database server manages.
        syscheckpoint
        syschunks
        The syschunks table contains a description of each of the chunks that the database server manages.
        sysckptinfo
        The sysckptinfo system-monitoring interface table provides historical information about the previous twenty checkpoints.
        syscluster
        syscmsm
        syscmsmsla
        syscmsmtab
        syscmsmunit
        syscompdicts_full
        The syscompdicts_full table and the syscompdicts view provide information on all compression dictionaries. The only difference between the table and the view is that, for security purposes, the view does not contain the dict_dictionary column.
        sysconfig
        sysdatabases
        sysdbslocale
        sysdbspaces
        The sysdbspaces table contains a description of each of the storage spaces that the database server manages.
        sysdri
        sysdual
        sysenv
        sysenvses
        sysextents
        sysextspaces
        sysfeatures
        sysha_lagtime Table
        The sysha_lagtime table provides a history of the amount of time that it took to apply a log record on any of the secondary nodes.
        sysha_type
        sysha_workload
        sysipl
        syslocks
        syslogs
        syslogfil table
        The syslogfil table provides information about the logical log files.
        sysmgminfo
        sysnetclienttype
        sysnetglobal
        sysnetworkio table
        The sysnetworkio table contains information about the system network.
        sysonlinelog
        sysprofile
        sysproxyagents
        sysproxydistributors
        sysproxysessions table
        The sysproxysessions table contains information about each of the sessions that are using redirected-write functionality. This table is only valid on the secondary server.
        sysproxytxnops table
        The sysproxytxnops table contains information about each of the transactions that are running through each proxy distributor.
        sysproxytxns table
        The sysproxytxns table contains information about all of the current transactions that are running through each proxy distributor.
        sysptnhdr
        The sysptrhdr table contains information about partition headers.
        sysptprof table
        The sysptprof table lists information about a tblspace. Tblspaces correspond to tables.
        sysrepevtreg table
        Use the sysrepevtreg pseudo table to register for a pre-defined set of events from the Connection Manager.
        sysrepstats table
        Use the sysrepstats table to post events to Connection Manager.
        sysrsslog
        sysscblst
        syssscelem
        syssesappinfo
        syssesprof
        syssessions
        syssessiontempspaceusage
        The syssessiontempspaceusage table contains information about each session's temp space usage, includes both implicit and explicit temp tables.
        syssmx
        syssmxses
        syssqexplain table
        The syssqexplain pseudo table stores information about SQL queries.
        syssqltrace
        syssqltrace_hvar
        The syssqltrace_hvar table describes information about the SQL tracing host variable.
        syssqltrace_info
        The syssqltrace_info table describes information about the SQL profile trace system.
        syssqltrace_iter
        syssrcrss
        syssrcsds
        The syssrcsds table provides SD secondary server related statistics at the primary server.
        systabnames
        systhreads
        systrgrss
        systrgsds
        The systrgsds table provides SD secondary server related statistics at the SD secondary server.
        sysvpprof
        sys_ra_act_queues
        The sys_ra_act_queues contains information about read-ahead queues with pending requests.
        sys_ra_act_daemons
        The sys_ra_act_daemons table contains information about read-ahead daemons currently processing requests.
        sys_ra_ptn_stats
        The sys_ra_ptn_stats table contains read-ahead statistics broken down by partition. The same information is shown by the onstat -g rah partitions command.
        sys_ra_thrd_stats
        The sys_ra_thrd_stats table contains read-ahead statistics broken down by requesting thread. The same information is shown by the onstat -g rah threads command.
        The SMI Tables Map
        Information from onstat in the SMI Tables
      - The sysadmin Database
        The sysadmin database contains the tables that contain and organize the Scheduler tasks and sensors, store data collected by sensors, and record the results of Scheduler jobs and SQL administration API functions.
      - Disk Structures and Storage
      - Interpreting Logical-Log Records
    - Administrative Utilities
    - SQL Administration API
    - Appendixes
  - 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.
  - 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.
  - 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
  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.

sysdual

The sysdual table returns exactly one column and one row.


Column	Type	Description
dummy	char(1)	Dummy columns returning "X"