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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
Migrating to Informix® 14.10When you migrate to a new version of Informix®, you must complete required migration and post-migration tasks.
Migrating to the new version of Informix®After you prepare your databases for migration, you can migrate to the new version of Informix®.
Customizing configuration filesWhen you initialize the new version of Informix®, which contains a new onconfig.std file, use the same configuration that the old database server used. After you observe the performance of new version, you can examine the new file for new configuration parameters that you might want to use and can you start to use the new and changed configuration parameters.

Customizing configuration files

When you initialize the new version of Informix®, which contains a new onconfig.std file, use the same configuration that the old database server used. After you observe the performance of new version, you can examine the new file for new configuration parameters that you might want to use and can you start to use the new and changed configuration parameters.

Set the ALARMPROGRAM configuration parameter to either nothing or no_log.sh to prevent the generation of errors if the logical log fills during the migration. For more details, see Starting the new version of Informix. After the migration, change the value of ALARMPROGRAM to log_full.sh.

If the ALARMPROGRAM configuration parameter is set to the script alarmprogram.sh, set the value of BACKUPLOGS in alarmprogram.sh to N.

Important: To facilitate migration (and reversion), use the same values for your new database server for ROOTOFFSET , ROOTSIZE, and ROOTPATH that you used for the old database server. Also, keep the same size for physical logs and logical logs, including the same number of logical logs, and the same sqlhosts file.

For information about how to configure Informix, see your Informix Administrator's Guide. For information about how to tune the configuration parameters, see the Informix Performance Guide.

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