Home
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 to and reversion from 14.10
Enterprise Replication and migration
You must coordinate the migration of all servers that are involved in data replication.

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
    - Preparing for migration to Version 14.10
      Before you install the new version of Informix®, you must prepare the database server environment for migration by performing specified pre-migration tasks. If you are also migrating from 32-bit to 64-Bit database servers, you must perform additional tasks.
    - Enterprise Replication and migration
      You must coordinate the migration of all servers that are involved in data replication.
      - Preparing to migrate with Enterprise Replication
        If you use Enterprise Replication, you must do replication-related tasks to prepare for migration.
      - Migrating with Enterprise Replication
        If you use Enterprise Replication, you must complete replication-related tasks when you migrate to a new version of Informix®. If you are converting to Informix 12.10.xC4 or later from an earlier fix pack in the same release, you also have to complete these tasks.
      - Reverting with Enterprise Replication
        If you use Enterprise Replication, you must complete replication-related tasks when you revert from the new version of Informix®. If you are reverting from Informix 12.10.xC4 or later to a fix pack earlier than 12.10.xC4 in the same release, you also have to complete these tasks.
    - High-availability cluster migration
      You must coordinate the migration and reversion of all servers that are involved in high-availability clusters. You can use a rolling upgrade in some cases to update servers while the cluster is online, with minimal interruption to client applications. Otherwise, you must schedule cluster downtime to upgrade the servers. A cluster must be offline to reverse an upgrade or revert to an earlier release.
    - Migrating to Informix® 14.10
      When you migrate to a new version of Informix®, you must complete required migration and post-migration tasks.
    - Reverting from Informix® Version 14.10
      You can revert to the version of the database server from which you migrated. When you run the reversion utility, you specify the target server for reversion and then Informix® checks your database. If necessary, Informix might tell you to drop new objects, before automatically converting your data into the target server.
  - Migration of data between database servers
  - Data migration utilities

Enterprise Replication and migration

You must coordinate the migration of all servers that are involved in data replication.

These topics describe the additional tasks that you must perform when migrating to and reverting from Informix® if you are running Enterprise Replication.