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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.
Migration to and reversion from 14.10
Reverting from Informix® Version 14.10You 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.
Reverting from Informix® Version 14.10After preparing to revert, run the reversion utility and prepare to use the original database server.
Reinstall and start the earlier database serverReinstall and configure the earlier version of the database server.

Reinstall and start the earlier database server

Reinstall and configure the earlier version of the database server.

Refer to the instructions in your Informix® Installation Guide and your Informix Administrator's Guide.

Before you start the server: If you have time series data and you reverted to Informix 12.10.xC1, you must install the patch patch-idsdb00493404.tar on Informix 12.10.xC1. You can obtain the patch from the Support Portal.

Run the oninit -s command to start the earlier database server in quiescent mode.

Important: Do not use the oninit -i command.

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