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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.
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.
The full-screen menu interface
The DB-Access full-screen menu interface guides you through running SQL statements.
The Database option
Use the Database option to work with databases and transactions.
Close a database
To close the current database, use the cLose option from the DATABASE menu.

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.
    - Getting started with DB-Access
      DB-Access provides a menu-driven interface for entering, running, and debugging Structured Query Language (SQL) statements and Stored Procedure Language (SPL) routines. You can also run DB-Access interactively from the command line.
    - The full-screen menu interface
      The DB-Access full-screen menu interface guides you through running SQL statements.
      - The Query-language option
        Use the Query-language option to enter, modify, save, retrieve, and run SQL statements. DB-Access retains the statements, if any, in the editor. These statements are called the current statements.
      - The Database option
        Use the Database option to work with databases and transactions.
        List of available databases
        When you choose the Select option, the SELECT DATABASE screen opens. The first database in the list of available databases is highlighted, accompanied by the names of database servers.
        Retrieve nondefault locale information
        Close a database
        To close the current database, use the cLose option from the DATABASE menu.
      - The Table option
        Use the Table option to work with tables.
      - The Connection and Session options
        Use the Connection option if you want to connect to a specific database server and database or explicitly disconnect from the current database environment. Use the Session option to display information about the current DB-Access session.
    - Appendixes
  - 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.

Close a database

To close the current database, use the cLose option from the DATABASE menu.

If you begin a transaction but do not commit it or roll it back, and then you try to close a database with transactions, the TRANSACTION menu opens. The TRANSACTION menu ensures that you either commit or roll back an active transaction before you close the current database.

Important: Select an option carefully. You might commit transactions that you do not want if you select Commit, and you do lose any new transactions if you select Rollback.

The TRANSACTION menu also opens whenever you attempt to open a new database or try to leave the DB-Access menu system without first terminating a transaction.

Important: If you begin a transaction in an ANSI-compliant database but do not issue a COMMIT statement or ROLLBACK statement, then try to close the database using a non-menu mode, DB-Access commits the transaction for you. If you do not want to commit the transaction, issue both a ROLLBACK statement and a CLOSE DATABASE statement from the command line.