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Oracle Database Migration Assistant for Unicode


What is Oracle Database Migration Assistant for Unicode?

Oracle Database Migration Assistant for Unicode (DMU) is a unique next-generation migration tool providing an end-to-end solution for migrating your databases from legacy encodings to Unicode. DMU's intuitive user-interface greatly simplifies the migration process and lessens the need for character set migration expertise by guiding the DBA through the entire migration process as well as automating many of the migration tasks. It comes with a scalable in-place migration architecture which significantly reduces the effort and downtime required for data conversion, comparing to conventional export and import migration methods. For post-migration and existing databases already using the Unicode character set, the DMU also has a validation mode, in which it identifies data not correctly encoded in Unicode, thus providing a healthcheck on potential issues with implementation of Unicode in database applications.

New! Oracle DMU 2.0, released in March 2014, supports the migration of Oracle 12c pluggable databases (PDBs) to Unicode. The pluggable databases in the multitenant architecture of Oracle 12c are many databases managed together in one Oracle Database instance. Using Unicode for these databases allows the support of character data in any languages and assures maximum compatibility among the databases to be consolidated. It is recommended to use the DMU to migrate the databases to Unicode before consolidating them as pluggable databases. However, with DMU 2.0, the migration, especially the data conversion phase, can also be performed after the consolidation. Other new features in DMU 2.0 include enhanced bulk cleansing features with pattern-based replacement to resolve certain classes of data convertibility issues, support for migrating PeopleSoft databases to Unicode, and improved conversion error-handling mechanisms. Please see the DMU 2.0 Release Notes for changes since the 1.2 release.

Oracle DMU is described in more details in the DMU Data Sheet.

Licensing and Support

Oracle DMU is a free Oracle Database tool. It is distributed via OTN and via My Oracle Support (MOS). Both download packages are identical but the OTN download is made available under the OTN Developer License, which allows you to evaluate the tool, while the MOS download is a Program Update under the database support contract and permits you to migrate production databases covered by a valid support contract on any level that entitles to Program Updates.

The DMU is fully supported for customers with database support contracts on any level that entitles to assistance with service requests. You can file service requests for the DMU as you can for your Oracle Database.

Supported Database Releases

For information about the currently supported database releases and platforms, see Supported Configurations. A database patch may be required for using the DMU with a supported release. Required patches are listed in the same document.


Support for more platforms will be added in upcoming database releases.

Getting Started

Want to try out the DMU? Refer to the Getting Started page for a step-by-step instruction to download, install and start the tool.

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