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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.
Appendixes
This section contains additional reference information.
The HPL log-file and pop-up messages
This section provides explanatory notes and corrective actions for unnumbered messages that print in the log file. The section also includes information specific to messages that are returned to standard output or appear in a pop-up dialog box (depending on the way you started onpload).
The HPL log-file messages
Internal error: Cannot initialize AIO library

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 Informix® Administrator's Guide provides the information required to administer HCL Informix.
  - Administrator's Reference
    The 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 Informix® DB-Access User's Guide describes how to use the DB-Access utility to access, modify, and retrieve information from 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
    - 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.
      - The onpload database
        The tables in the onpload database hold information that the onpload utility uses. This section describes the tables in the onpload database that you create or modify with ipload.
      - High-Performance Loader configuration file
        The default $INFORMIXDIR/etc/plconfig.std file on UNIX™ or %\INFORMIXDIR%\etc\plconfig.std on Windows™ is the high-performance loader configuration file.
      - Picture strings
        The HPL uses two types of picture strings: COBOL picture strings and other picture strings.
      - Match condition operators and characters
        This section describes the operators that are available when you match text and it provides an example of each operator.
      - Custom-conversion functions
        Custom-conversion functions allow you to add additional data conversion capability to the . This feature lets onpload call a custom-conversion function during the data-conversion process.
      - The onstat -j option
        The -j option of the onstat utility provides special information about the status of an onpload job. The -j option provides an interactive mode that is analogous to onstat -i.
      - The HPL log-file and pop-up messages
        This section provides explanatory notes and corrective actions for unnumbered messages that print in the log file. The section also includes information specific to messages that are returned to standard output or appear in a pop-up dialog box (depending on the way you started onpload).
        How HPL logfile messages are ordered
        HPL logfile message categories
        The HPL log-file messages
        Blob conversion error occurred on record record_num
        Cannot access database table table_name: SQL error error_num
        Cannot allocate shared memory
        Cannot allocate TLI memory for operating_system structure
        Cannot bind socket connection: errno= operating-system_error_num
        Cannot bind TLI connection: t_errno= t_error_num
        Cannot configure driver driver_name
        Cannot connect to message server: Socket error = UNIX_error_num
        Cannot connect to message server: TLI erro r= t_error_num, TLI event = t_event_num, errno = error_num
        Cannot connect to server_name: SQL error error_num, ISAM error error_num
        Cannot connect worker to server data stream
        Cannot disable table_name object constraints: SQL error error_num, ISAM error error_num
        Cannot disable primary-key constraint. Child-table references exist
        Cannot express load to logged table on HDR server server_name
        Cannot filter indexes for table table_name: SQL error error_num, ISAM error error_num
        Cannot find the shared library path in the plconfig file. Using the shared library from the default location library_location
        Cannot find the user-defined function user_func_name in the shared library: error error_num
        Cannot get systable info for table table_name: SQL error error_num, ISAM error error_num
        Cannot initialize shared library handling
        Cannot load code-set conversion file from file_name to file_name
        Cannot load mapping definitions
        Cannot load the shared library library_location
        Shared library load failed with error message error_message.
        Cannot locate delimiter in data file
        Cannot open
        Cannot open simple large object file: file_name, simple large object not loaded
        Cannot open database database_name: SQL error error_num, ISAM error error_num
        Cannot open file file_name: error number operating-system_error_num
        Cannot open TCP connection for server_name: errno operating-system_error_num
        Cannot perform express mode load on table with pseudo rowid
        Cannot perform express-mode load with rowsize = row_length > page_size
        Cannot read file file_name: AIO error code operating-system_error_num
        Cannot re-enable all objects: num_violations violations detected
        Check for violations in violations table table_name and diagnostics table table_name.
        Cannot reorder query statement to align simple large objects or Ext Types
        Cannot reorder query statement to align blobs
        Cannot set mode of table_name objects from current_mode to final_mode mode: SQL error error_num, ISAM error error_num
        Cannot start violations table for table_name: SQL error error_num, ISAM error error_num
        Cannot stop violations table for table_name: SQL error error_num, ISAM error error_num
        Cannot unload to multiple devices when the given query cannot be executed in parallel
        Cannot write file file_name: AIO error code operating-system_error_num
        Code-set conversion overflow
        Conversion of onpload database failed due to error error_num
        Conversion of onpload database failed due to error error_num, run as user informix
        Custom conversion function function_name not found in shared library
        Discarded num_bytes null bytes from end of tape device device_name
        Environment variable variable_name expansion would overflow string
        Error accepting socket connection: errno = operating-system_error_num
        Error accessing file_name
        Error accessing format: SQL error error_num, ISAM error error_num
        Error accessing map map_name: SQL error error_num, ISAMerror error_num
        Error accessing sysmaster: SQL error error_num, ISAMerror error_num
        Error accessing table table_name: SQL error error_num, ISAM error error_num
        Error: AIO buffer size buffer_size is less than required minimum size size
        Error error_num closing current database
        Error operating-system_error_num closing file file_name
        Error error_num converting record field field_name to column column_name
        Error declaring cursor: could not get table info
        Error declaring cursor: SQL error error_num, ISAM error error_num
        Error describing unload query query_name: SQL error error_num, ISAM error error_num
        Error error_num initializing backend connection
        Error inserting into table table_name: SQL error error_num, ISAM error error_num
        Error listening for socket connection: t_errno = t_error_num errno = operating-system_error_num
        Error listening for TLI connection: t_errno = t_error_num errno = UNIX_error_num
        Error error_num on record record_num converting column column_name to record field field_name
        Error occurred on record %d reading pipe %s
        Error on close of server load session: SQL error error_num, ISAM error error_num
        Error opening cursor: SQL Error error_num
        Error preparing query: SQL error error_num
        Error preparing statement statement_name: SQL error error_num, ISAM error error_num
        Error preparing unload query query_name: SQL error error_num, ISAM error error_num
        Error error_num reading message queue
        Error operating-system_error_num reading TLI/socket connection
        Error error_num setting isolation level
        Error error_num writing message on message queue
        Error operating-system_error_num writing TLI/socket connection
        Error: Stream buffer size buffer_size is less than required minimum size size
        Exhausted all attempts to allocate shared-memory key.
        Fatal error: cannot execute pipe_name
        Fatal error: cannot load X resource
        Fatal error creating server load session: error error_num
        Fatal error getting stream buffer from server
        Fatal error in server row processing: SQL error error_num, ISAM error error_num
        File type device file file_name is not a regular (disk) file
        Got Interrupt: Shutting down
        Internal error: Cannot initialize AIO library
        Internal error: Cannot send message
        Internal error: error_num. Contact Tech Support
        Internal error: invalid message type error_num
        Internal error error_num reading queue
        Invalid count detected, might be due to abnormal BE shutdown
        Invalid code-set character: Cannot convert
        Invalid HEXASCII simple large object or extended type representation on record record_num
        Invalid HEXASCII simple large object representation in fieldname, record record_num
        Invalid project name project_name entered
        Invalid reject count detected, might be due to abnormal BE shutdown. Using last known reject count and proceeding
        Invalid session ID id_number
        Invalid tape header expecting -> tape_name
        Map map_name type is not a load map
        Method not supported by current driver
        MT cannot bind to vpid
        MT internal failure
        MT failure putting CPU online
        No insert permission on table table_name
        No mapping to simple large object field field_name
        onpload must run on the host host_name that contains the target database
        onpload terminated by signal
        Pipe type device file file_name is not a regular file
        Pload cannot reorder queries having expressions/aggregates and blobs/udts in the same select list
        Reorder the select list in the query in the following order: 1. non-blob non-udt columns 2. inrow udts in the case of fixed format 3. other blob/udt columns
        Query contains unmapped simple large object column column_name: Cannot proceed
        Query for unload is not a select query.
        Record is too long to process: recnum record_num, length record_length, bufsize buffer_size
        Server interface error; expected num_input but got num_received instead
        SQL error error_num executing statement statement_name
        Simple large object or extended type conversion error occurred on record record_num
        Start record record_num is greater than number of records total_num read from input file_name
        Successfully loaded the shared library library_location
        Table table_name will be read-only until level-0 archive
        Tables with BLOBS cannot be loaded in High Performance Mode
        Tables with BLOBS or extended types cannot be loaded in Express® mode
        Tables with simple large objects or extended types cannot be processed with no conversion (-fn)
        Tape header is larger than I/O buffer: tape header_length, I/O buffer_size
        Tape type device file file_name is not a character-special or block-special file
        There is no mapping to column column_name, which cannot accept null values
        Unable to load locale categories for locale locale_name: error error_num
        Unload query select item for the query_item expression needs to be assigned a name
        Write/read to/from tape until end of device
        Write to device (tape or pipe) device_name failed; no space left on device. AIO error error_num
        HPL logfile pop-up messages
      - Custom drivers
        If your operating system supports dynamic linking of libraries, you can use a custom driver to extend the functionality of the to support different file types or access mechanisms.
      - Run load and unload jobs on a Windows™ computer
      - Conversion and reversion scripts for HPL database migration
        When you convert or revert to different versions of the database server, you can use conversion and reversion scripts to manually upgrade or revert your onpload database. You must use these scripts if you are required to upgrade between the same server versions.
  - Performance Guide
    The 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 Informix® Backup and Restore Guide describes how to use the 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
  The HCL® Informix® Enterprise Replication Guide describes the concepts of data replication using Informix Enterprise Replication, including how to design your replication system, as well as administer and manage data replication throughout your enterprise.

Internal error: Cannot initialize AIO library

This critical initialization error probably means that the UNIX™ kernel does not have enough shared memory or semaphores configured.

Increase shared memory or semaphores. If the condition persists, contact Technical Support.