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Migrating and upgradingYou 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 systemsThe Informix® Migration Guide describes how to move data manually between databases, servers, and computers.
Data migration utilities
The onmode utility reversion optionYou use the -b option of the onmode utility to revert to the older database server from which you converted.
Preparation for using the onmode -b commandBefore you use the onmode -b command, notify users that you are going to bring the database server offline. The reversion utility forcibly removes all users and shuts down the database server.

Preparation for using the onmode -b command

Before you use the onmode -b command, notify users that you are going to bring the database server offline. The reversion utility forcibly removes all users and shuts down the database server.

The onmode -b command includes an implicit -yuk command.

Make sure that the INFORMIXSERVER environment variable is set to the correct database server.

UNIX/Linux Only: You must be user root or user informix to run onmode.

Windows™ Only: You must be a member of the Informix-Admin group to run onmode.

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