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Migrating and upgrading
You can upgrade to the 14.10 release of HCL Informix® or migrate from other database servers to Informix. Upgrading is an in-place migration method that uses your existing hardware and operating system software. Some changes to the Informix database server can affect upgrading from a previous release.
Migrating Informix® database systems
The Informix® Migration Guide describes how to move data manually between databases, servers, and computers.
Migration of data between database servers
Migrating database servers to a new operating system
When you migrate to a new operating system, you must choose a tool for migrating your data, you might need to make some adjustments to your tables, and you must review environment-dependent configuration parameters and environment variables.
Adapting your programs for a different operating system
When you change to a different operating system, you must review and, if necessary, adjust your environment-dependent configuration parameters and environment variables.

Migrating and upgrading
You can upgrade to the 14.10 release of HCL Informix® or migrate from other database servers to Informix. Upgrading is an in-place migration method that uses your existing hardware and operating system software. Some changes to the Informix database server can affect upgrading from a previous release.
- Migrating Informix® database systems
  The Informix® Migration Guide describes how to move data manually between databases, servers, and computers.
  - Overview of migration
  - Migration to and reversion from 14.10
  - Migration of data between database servers
    - Migrating database servers to a new operating system
      When you migrate to a new operating system, you must choose a tool for migrating your data, you might need to make some adjustments to your tables, and you must review environment-dependent configuration parameters and environment variables.
      - Choosing a tool for moving data before migrating between operating systems
        If you are migrating between different operating systems, you must choose a method for exporting and importing data. The tool that you choose for exporting and importing data depends on how much data you plan to move.
      - Adjusting database tables for file-system variations
        File system limitations vary between NFS and non-NFS file systems. You might need to break up large tables when you migrate to a new operating system.
      - Moving data to a database server on a different operating system
        You can move data between Informix® database servers on UNIX™ or Linux™ and Windows™.
      - Adapting your programs for a different operating system
        When you change to a different operating system, you must review and, if necessary, adjust your environment-dependent configuration parameters and environment variables.
      - Ensuring the successful creation of system databases
        The first time the database server is brought online, the sysmaster, sysutils, sysuser, and sysadmin databases are built. After moving to a database server on a different operating system, check the message log to ensure that the sysmaster and sysutils databases have been created successfully before you allow users to access the database server.
  - Data migration utilities

Adapting your programs for a different operating system

When you change to a different operating system, you must review and, if necessary, adjust your environment-dependent configuration parameters and environment variables.

Certain database server configuration parameters and environment variables are environment-dependent.

For details, see the information about configuration parameters in the Informix® Administrator's Guide and the Informix® Administrator's Reference and the information about environment variables in the Informix® Administrator's Guide and the Informix® Guide to SQL: Reference.