全面的评估是迁移成功的一个关键要素，评估的总体目标是发现可能影响迁移过程的问题以便分配足够的资源来保证迁移取得成功。首先
数据库迁移可以看作一个特殊的软件开发项目，与其他开发项目不同的是这个项目的需求是确定的，技术障碍较低，主要工作是代码编写和测试。对数据库管理人员来说，数据库数据迁移极具挑战性，一旦措施不当，珍贵的数据资源将面临丢失的危险，要成功地实现数据库数据平滑迁移，需要周密计划和充分准备，并按照一定的步骤来完成。另一方面，数据库迁移项目的成功也主要依赖于客户与开发商的积极配合和有序组织。当然，企业数据库通常数据量都比较大，，结构也比较复杂，如果完全通过手工来完成，那是一个不可想象的大工程。所以正确的步骤加合适的迁移工具也能达到事半功倍的效果。
Oracle向DB2迁移的主要流程
Oracle向DB2迁移一般来说遵循3大流程：迁移评估、模拟迁移、正式迁移。
1、迁移评估
全面的评估是迁移成功的一个关键要素，评估的总体目标是发现可能影响迁移过程的问题以便分配足够的资源来保证迁移取得成功。首先，是评估应用环境和应用程序，识别潜在的障碍;第二，您的 Oracle 数据库将在多大程度上适应 DB2 的硬数据;最后，分析 Oracle 数据库对象和过程，识别使用 DB2中不支持的那些特性的对象和过程。
2、模拟迁移
1)在进行模拟迁移前，我们必须先设计数据迁移的方案，一般设计数据迁移方案主要包括以下几个方面工作：研究与数据迁移相关的资料，或在网站上查询相关内容、选择数据迁移的软硬件平台、选择数据迁移方法、选择数据备份和恢复策略、设计数据迁移和测试方案等。
2)根据设计的数据迁移方案，建立一个模拟的数据迁移环境，它既能仿真实际环境又不影响实际数据，然后在数据模拟迁移环境中测试数据迁移的效果。数据模拟迁移前也应按备份策略备份模拟数据，以便数据迁移后能按恢复策略进行恢复测试。
3)根据设计的数据迁移测试方案测试数据模拟迁移，也就是检查数据模拟迁移后数据和应用软件是否正常，主要包括：数据一致性测试、应用软件执行功能测试、性能测试、数据备份和恢复测试等。
3、正式迁移
数据模拟迁移测试成功后，可以正式实施数据的迁移了。在这里介绍一种简单的测试方法，首先利用 DB2 兼容特性迁移 Oracle 应用，创建兼容模式 DB2 数据库。在 DB2 V9.7 上启用 Oracle 应用程序时，实例和数据库必须处于兼容模式。还建议调整舍入行为以匹配 Oracle。通过把重新验证语义(revalidation semantics)设置为 deferred_force，可以不按依赖次序部署对象。
在 UNIX 系统上：
在Windows上：
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