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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.
Recompile Java™ user-defined routinesAfter you revert and before you start the earlier server, recompile Java™ user-defined routines (UDRs) that were compiled with a Java™ development kit version that is earlier than or equal to the version included with the previous server.

Recompile Java user-defined routines

After you revert and before you start the earlier server, recompile Java™ user-defined routines (UDRs) that were compiled with a Java development kit version that is earlier than or equal to the version included with the previous server.

What you do depends on whether your application uses external JAR and class files or JAR files installed on the server:

If your application uses external JAR and class files (for example, JAR and class files that are listed in JVPCLASSPATH), recompile the files.
If your application uses JAR files installed in the server (for example, through the install_jar() support function), you must remove the old JAR file (by using the remove_jar() support function) and reinstall the recompiled JAR file in the database.

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