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Siebel Database Upgrade Guide > Siebel Database and UI Upgrade Planning > Upgrade Planning for Siebel Unicode SupportUpgrades from: All Supported Siebel releases. Environments: Development, production test, production. For Western European languages and Japanese, Oracle's Siebel applications support both non-Unicode and Unicode code pages. For all other supported languages, Siebel applications support only Unicode code pages. Unicode is recommended if your installation uses Siebel Email Response, correspondence, or similar functionality, particularly if content is generated on a separate system. This is because Siebel applications use Unicode internally. If the RDBMS is not using Unicode, Siebel applications convert content from Unicode to the database code page. Using a Unicode code page for the database prevents string conversion problems on text content. Before converting to Unicode, your encryption method must be RC2 or AES. CAUTION: Migrating to Unicode is more complex than simply importing your existing data into a Unicode database. Failure to execute the migration correctly can result in serious data corruption or unrecoverable data loss. For this reason, Oracle's Advanced Customer Services participation is mandatory. To perform a Unicode migration, contact your Oracle sales representative for Oracle Advanced Customer Services to request assistance from Oracle's Application Expert Services. For a list of supported languages and code pages, see Siebel System Requirements and Supported Platforms on Oracle Technology Network. For information about Unicode and global deployment for Siebel Business Applications, see Global Deployment Guide. For information on upgrading to RC2 encryption, see Security Guide for Siebel Business Applications. Planning Considerations for the Unicode MigrationMigrations to Unicode require the assistance of Oracle's Advanced Customer Services. Contact your Oracle sales representative for Oracle Advanced Customer Services to request assistance from Oracle's Application Expert Services to migrate your upgraded database from a non-Unicode code page to Unicode. To perform the migration, you can use either database vendor native utilities or Siebel utilities. If you are planning to migrate your upgraded application to Unicode, consider the following points:
Supported Types of UnicodeThe current release supports two types of Unicode:
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