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HCL OneDB V 1.0.1.0
  • What's new in HCL OneDB™ 1.0.1.0
  • Getting Started
  • Installing
  • Administering
  • Security
  • Client APIs and tools
  • SQL programming
  • JSON compatibility
  • Extending HCL OneDB™
  • Designing databases
  • Embedding HCL OneDB™
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  1. Home
  2. AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
  3. System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
  4. Administrator's GuideThe HCL OneDB™ Administrator's Guide provides the information required to administer HCL OneDB™.
  5. Logging and log administration
  6. Manage logical-log files
  7. Free a logical-log file
  8. Free a log file with status U
  • AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
    • System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
      • Administrator's GuideThe HCL OneDB™ Administrator's Guide provides the information required to administer HCL OneDB™.
        • The database server
        • Disk, memory, and process management
        • Logging and log administration
          • Logging
          • Manage the database-logging modeYou can monitor and modify the database-logging mode.
          • Logical log
          • Manage logical-log files
            • Estimate the size and number of log files
            • Back up logical-log files
            • Switch to the next logical-log file
            • Free a logical-log file
              • Delete a log file with status D
              • Free a log file with status U
              • Freeing a log file with status U-B or FIf a log file is backed up but still in use (status U-B), some transactions in the log file are still under way, or the log file contains the oldest update that is required for fast recovery. Because a log file with status F has been used in the past, it follows the same rules as for status U-B.
              • Freeing a log file with status U-C or U-C-L
              • Free a log file with status U-B-LIf a log file is backed up and all transactions within it are closed but the file is not free (status U-B-L), this logical-log file contains the most-recent checkpoint record. You can free log files with a status U-B-L.
            • Monitor logging activity
            • Allocate logical log filesWhen you initialize or restart the database server, it creates the number of logical-log files that are specified by the LOGFILES configuration parameter. The size of the logical log files is specified by the LOGSIZE configuration parameter.
            • Dropping logical-log filesYou can use an onparams command or ON-Monitor to drop logical-log files.
            • Change the size of logical-log files
            • Move logical-log filesYou might want to move logical-log files for performance reasons or to make more space in the dbspace.
            • Display logical-log records
            • Controlling long transactions
          • Physical logging, checkpoints, and fast recovery
          • Manage the physical log
        • Fault tolerance
        • High availability and scalabilityA 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 actionsYou can use the SQL administration API, the Scheduler, and drill-down queries to manage automatic maintenance, monitoring, and administrative tasks.
        • HCL OneDB server licensing
      • Administrator's ReferenceThe HCL OneDB™ Administrator's Reference includes comprehensive descriptions of HCL OneDB™ 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 GuideThis publication describes how to use the DB-Access utility to access, modify, and retrieve information from HCL® OneDB® database servers.
      • OneDB ExploreOneDB Explore 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 OneDB 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. OneDB Explore 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. OneDB Explore is the centralized hub for graphical monitoring, alerting, and administration of your Informix database servers.
    • Backup and Restore GuideThe HCL OneDB™ Backup and Restore Guide describes how to use the HCL® OneDB® 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 ReplicationThe HCL OneDB™ Enterprise Replication Guide describes the concepts of data replication using HCL® OneDB® Enterprise Replication, including how to design your replication system, as well as administer and manage data replication throughout your enterprise.

Free a log file with status U

If a log file contains records, but is not yet backed up (status U), back up the file using the backup tool that you usually use.

If backing up the log file does not change the status to free (F), its status changes to either U-B or U-B-L. See Freeing a log file with status U-B or F or Free a log file with status U-B-L.

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