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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.
Preparing to revertIf you used Version 14.10, you must prepare your system for reversion to the pre-migration version of the database server.
Verify the integrity of the Version 14.10 dataVerify the integrity of your Version 14.10 data, if you did not do this after you migrated.

Verify the integrity of the Version 14.10 data

Verify the integrity of your Version 14.10 data, if you did not do this after you migrated.

To verify the integrity of your data, run the following commands:

oncheck -cI database_name  
oncheck -cD database_name  
oncheck -cr  
oncheck -cc database_name

If the oncheck utility finds any problems, the utility prompts you to respond to corrective action that it can perform. If you respond Yes to the suggested corrective action, run the oncheck command again to make sure the problem has been fixed.

The oncheck utility cannot fix data that has become corrupt. If the oncheck utility is unable to fix a corruption problem, you might need to contact Technical Support before your proceed.

You will also need to verify the integrity of your data after you revert.

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