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.
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.
Management Information Base reference
An SNMP Network Manager hides most of the structures of the Management Information Base (MIB). However, an understanding of this structure can help you comprehend the information that an SNMP Network Manager displays.
Online MIB in the Informix® Private MIB
The Online MIB defines several tables that provide information that is relevant for HCL Informix® database servers and their databases.
onChunkTable

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.
  - 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.
    - SNMP concepts
      This section provides a brief introduction to Simple Network Management Protocol (SNMP).
    - Informix® implementation of SNMP
      The HCL Informix® implementation of SNMP lets database administrators monitor Informix database servers and databases.
    - Management Information Base reference
      An SNMP Network Manager hides most of the structures of the Management Information Base (MIB). However, an understanding of this structure can help you comprehend the information that an SNMP Network Manager displays.
      - Application MIB
        HCL Informix® uses one table from the application MIB. This table provides general-purpose attributes for each database server.
      - RDBMS MIB
        The Relational Database Management System (RDBMS) MIB defines several tables that provide information about managed database servers and their databases.
      - Online MIB in the Informix® Private MIB
        The Online MIB defines several tables that provide information that is relevant for HCL Informix® database servers and their databases.
        onActiveBarTable
        onActiveTableTable
        onBarTable
        onChunkTable
        onDatabaseTable
        onDbspaceTable
        onErQueueTable
        onErSiteTable
        onFragmentTable
        onLockTable
        onLogicalLogTable
        onPhysicalLogTable
        onServerTable
        onSessionTable
        onSqlHostTable
        onTableTable
- 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.

onChunkTable

The following list summarizes this table:

Contents:: Information about the chunks that the database servers use
Index:: applIndex, onDbspaceIndex, onChunkIndex
Scope of a row:: One chunk

The table has the following MIB objects.

Table 1. MIB objects for onChunkTable
MIB object	Description
applIndex	See applTable.
onDbspaceIndex	See rdbmsDbInfoTable.
onChunkIndex	Unique integer index for this chunk The database server generates this value.
onChunkFileName	Path name for the chunk
onChunkFileOffset	Offset into the device, in pages
onChunkPagesAllocated	Chunk size, in pages
onChunkPagesUsed	Number of pages used
onChunkType	Type of chunk: regularChunk (1) blobChunk (2) stageBlob (3)
onChunkStatus	Status of the chunk: offline (1) online (2) recovering (3) inconsistent (4) dropped (5)
onChunkMirroring	Mirroring status of the chunk: notMirrored (1) mirrored (2) newlyMirrored (3)
onChunkReads	Number of physical-read operations
onChunkPageReads	Number of page reads
onChunkWrites	Number of physical-write operations
onChunkPageWrites	Number of page writes
onChunkMirrorFileName	Path name of the mirror chunk If the chunk is not mirrored, this value is noSuchInstance (SNMPv2) or noSuchName (SNMPv1).
onChunkMirrorFileOffset	Offset of the mirror, in pages If the chunk is not mirrored, this value is noSuchInstance (SNMPv2) or noSuchName (SNMPv1).
onChunkMirrorStatus	Mirroring status: offline (1) online (2) recovering (3) inconsistent (4) dropped (5)

If the chunk is not mirrored, this value is noSuchInstance (SNMPv2) or noSuchName (SNMPv1).