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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.
Administrator's Guide
The Informix® Administrator's Guide provides the information required to administer HCL Informix.
Logging and log administration
Manage the physical log
Turn automatic LRU tuning on or off
Use the AUTO_LRU_TUNING configuration parameter to enable or disable automatic LRU tuning when the database server starts.

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.
    - The database server
    - Disk, memory, and process management
    - Logging and log administration
      - Logging
      - Manage the database-logging mode
        You can monitor and modify the database-logging mode.
      - Logical log
      - Manage logical-log files
      - Physical logging, checkpoints, and fast recovery
      - Manage the physical log
        Change the physical-log location and size
        You can use the onparams utility to change the location and size of the physical log.
        Monitor physical and logical-logging activity
        Monitor checkpoint information
        Monitor checkpoint activity to view information that includes the number of times that threads were required to wait for the checkpoint to complete. This information is useful for determining if the checkpoint interval is appropriate.
        Turn automatic LRU tuning on or off
        Use the AUTO_LRU_TUNING configuration parameter to enable or disable automatic LRU tuning when the database server starts.
    - Fault tolerance
    - High availability and scalability
      A successful production environment requires database systems that are always available, with minimal if any planned outages, and that can be scaled quickly and easily as business requirements change.
    - Distributed data
    - Overview of automatic monitoring and corrective actions
      You can use the SQL administration API, the Scheduler, and drill-down queries to manage automatic maintenance, monitoring, and administrative tasks.
  - 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.
  - 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.

Turn automatic LRU tuning on or off

Use the AUTO_LRU_TUNING configuration parameter to enable or disable automatic LRU tuning when the database server starts.

If the RTO_SERVER_RESTART configuration parameter is set, the database server automatically triggers checkpoints so that it can bring the server online within the specified time. The database server prints warning messages in the message log if the server cannot meet the RTO_SERVER_RESTART policy.

To turn off automatic LRU tuning for a particular session, issue an onmode –wm AUTO_LRU_TUNING=0 command.

To turn on automatic LRU tuning after turning it off during a session, issue an onmode –wm AUTO_LRU_TUNING=1 command

Automatic LRU tuning changes affect all buffer pools and adjust lru_min_dirty and lru_max_dirty values in the BUFFERPOOL configuration parameter.

For more information about LRU tuning, see the Informix® Performance Guide.