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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.
What the onmode -b command doesWhen you convert a database server, several modifications make the format of the databases incompatible with the older version. The onmode -b command modifies data so that the earlier version of the database server can access it.

What the onmode -b command does

When you convert a database server, several modifications make the format of the databases incompatible with the older version. The onmode -b command modifies data so that the earlier version of the database server can access it.

When you convert a database server, several modifications make the format of the databases incompatible with the older version. The onmode -b command modifies data so that the earlier version of the database server can access it. In some cases the format of the databases is compatible between versions and the onmode -b command is not needed. Type onmode -b to see the usage message for options that are available for your database server.

The utility does not revert changes made to the layout of the data that do not affect compatibility.

You must revert the databases before users can access the data with the earlier database server version.

For information about other onmode options, see The onmode utility in your Informix® Administrator's Reference.

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