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HCL Informix V14.10
  • HCL Informix® V14.10 documentation
  • Product overview
  • Installing
  • Administering
  • Migrating and upgrading
  • Client APIs and tools
  • Embedding Informix®
  • Extending Informix®
  • Data warehousing
  • Designing databases
  • JSON compatibility
  • Security
  • SQL programming
  • Troubleshooting HCL Informix®
  • Informix PDF guides
  1. Home
  2. Administering

    In addition to administering the database server, you can tune performance, replicate data, and archive data.

  3. 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.

  4. Administrator's Guide

    The Informix® Administrator's Guide provides the information required to administer HCL Informix.

  5. Disk, memory, and process management

  6. Virtual processors and threads

    These topics describe virtual processors, explain how threads run within the virtual processors, and explain how the database server uses virtual processors and threads to improve performance.

  7. Virtual processor classes

    Each class of virtual processor is dedicated to processing certain types of threads.

  8. User-defined classes of virtual processors

    You can define special classes of virtual processors to run user-defined routines or to run a DataBlade® module.

  9. Add and drop user-defined virtual processors in online mode

    You can add or drop virtual processors in a user-defined class while the database server is online.

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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.

      • 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

          • Virtual processors and threads

            These topics describe virtual processors, explain how threads run within the virtual processors, and explain how the database server uses virtual processors and threads to improve performance.

            • Virtual processors

              A virtual processor is a process that the operating system schedules for processing.

            • How virtual processors service threads

              A virtual processor services multiple threads concurrently by switching between them.

            • Virtual processor classes

              Each class of virtual processor is dedicated to processing certain types of threads.

              • CPU virtual processors

                The CPU virtual processor runs all session threads (the threads that process requests from SQL client applications) and some internal threads.

              • User-defined classes of virtual processors

                You can define special classes of virtual processors to run user-defined routines or to run a DataBlade® module.

                • Determine the number of user-defined virtual processors needed

                  You can specify as many user-defined virtual processors as your operating system allows.

                • User-defined virtual processors

                  User-defined classes of virtual processors protect the database server from ill-behaved user-defined routines.

                • Specify user-defined virtual processors

                  The VPCLASS parameter with the vpclass option defines a user-defined VP class. You also can specify a nonyielding user-defined virtual processor.

                • Assign a UDR to a user-defined virtual-processor class

                  The SQL CREATE FUNCTION statement registers a user-defined routine.

                • Add and drop user-defined virtual processors in online mode

                  You can add or drop virtual processors in a user-defined class while the database server is online.

              • Tenant virtual processor class

                Tenant virtual processor classes are specific to tenant databases. If you configure multitenancy for your Informix® instance, you can specify that session threads for tenant databases are run in tenant virtual processors instead of CPU virtual processors.

              • Java™ virtual processors

                Java™ UDRs and Java applications run on specialized virtual processors, called Java virtual processors (JVPs).

              • Disk I/O virtual processors

                The following classes of virtual processors perform disk I/O: PIO (physical-log I/O), LIO (logical-log I/O), AIO (asynchronous I/O), and CPU (kernel-asynchronous I/O).

              • Network virtual processors

                A client can connect to the database server in the through following ways: a network connection, a pipe, or shared memory.

              • Communications support module virtual processor

                The communications support module (CSM) class of virtual processors performs communications support service and communications support module functions.

              • Encrypt virtual processors

                Use the VPCLASS configuration parameter with the encrypt keyword to configure encryption VPs.

              • Audit virtual processor

                The database server starts one virtual processor in the audit class (ADT) when you turn on audit mode by setting the ADTMODE parameter in the onconfig file to 1.

              • Miscellaneous virtual processor

                The miscellaneous virtual processor services requests for system calls that might require a very large stack, such as fetching information about the current user or the host-system name.

              • Basic text search virtual processors

                A basic text search virtual processor is required to run basic text search queries.

              • MQ messaging virtual processor

                An MQ virtual processor is required to use MQ messaging.

              • XML virtual processor

                An XML virtual processor is required to perform XML publishing.

          • Manage virtual processors

            These topics describe how to set the configuration parameters that affect database server virtual processors, and how to start and stop virtual processors.

          • Shared memory

            These topics describe the content of database server shared memory, the factors that determine the sizes of shared-memory areas, and how data moves into and out of shared memory.

          • Manage shared memory

          • Data storage

            The database server uses physical units of storage to allocate disk space. It stores data in logical units. Unlike the logical units of storage whose size fluctuates, each of the physical units has a fixed or assigned size that is determined by the disk architecture.

          • Manage disk space

            You can use several utilities and tools to manage disk spaces and the data that the database server controls.

          • Moving data with external tables

            You can use external tables to load and unload database data.

          • Storage space encryption

            You can encrypt storage spaces (dbspaces, blobspaces and smart blobspaces) with Informix Dynamic Server. The data in encrypted storage spaces is unintelligible without the encryption key. Encrypting storage spaces is an effective way to protect sensitive information that is stored on disk.

        • Logging and log administration

        • 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.

Add and drop user-defined virtual processors in online mode

You can add or drop virtual processors in a user-defined class while the database server is online.

For instructions on how to do this, see Add virtual processors in online mode and Drop CPU and user-defined virtual processors.

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