Access2000迁移到Oracle9i要点
Access2000迁移到Oracle9i要点
正在看的ORACLE教程是:Access2000迁移到Oracle9i要点。 Oracle9i中提供强大的迁移功能，可以从多种数据库向Oracle迁移数据。Oracle新发行的迁移工具提供了从Access2000向Oracle92010迁移的简便易行的解决方案，该方案克服了中文乱码问题和字符串被截断的问题，如下就是从Access2000向Oracle92010迁移的全过程。一、到OTN下载最新版本的OMWB（Oracle Migration Workbench）并安装到http://otn.Oracle.com/tech/migration/focusareas/Access.html 下载Oracle Migration Workbench Release 9.2.0.1.2 for Microsoft Windows 98/NT/2000/XP 和 从Access 2.0, 95, 97 or 2000 to 到Oracle平台迁移的插件，二者的最新版本都是92012。首先把OMWB安装到与Oracle不同的主目录中，然后安装Access插件到同一目录。
二、为迁移准备数据源
到OMWB主目录的\Omwb\msaccess_exporter目录下，打开omwb2000.mde文件，输入将要迁移的Access数据库文件和即将生成的针对数据库的XML描述文件，这时你回发现在与Access相同的路径下生成了一个同名的XML文件，打开这个文件，其中记录了Access数据库的表的列和关系、视图的定义。OMWB支持Access的中文表名和列名，但要注意在生成XML文件之前要先修改\Omwb\msAccess_exporter\schema.dtd文件，将首行的encoding="ISO-8859-1"修改为encoding="GBK"，然后在通过打开omwb2000.mde文件为数据库生成XML文件，这时表名和列名就成功显示中文了，在迁移到Oracle之前，还要用同样方法修改生成的XML文件的编码为encoding="GBK"。
三、运行OMWB，执行迁移过程
运行OMWB，根据提示，输入Access数据库的描述文件，即上一步生成的XML文件，根据该文件为迁移生成数据源，该数据源包括表、索引、主键、关系和表验证规则。接下来生成Oracle模型，OMWB自动生成表空间和两个用户。数据源和目标数据模型都存储在Oracle的资料档案库里，该库由安装OMWB工具时系统提示生成。下一步就可以执行迁移过程了，还可以为迁移生成脚本程序。
四、解决中文字符被截断的问题
OMWB提供由数据源和目的的数据类型影射，修改该数据影射可以改变迁移目标的数据长度和类型，但我尝试多次也没能解决这个问题，包括在OMWB读取XML文件生成的Access模型中修改源数据类型也无济于事。问题在于Access本身。首先打开Access数据库，修改其数据表中的数据类型和长度，保存数据库后退出，再次为数据库生成XML描述，这时我们会发现XML文件的表列定义改变了，重新运行OMWB，为迁移生成源数据模型后，源模型和目标模型的数据类型和长度也自动改变了，之后的迁移过程即可正确迁移长中文字符串了。Oracle提供的企业管理器和应用服务器的web形式界面里存在几处相同的问题，修改资料档案库根本不能解决问题，这也算是Oracle数据库产品的图形界面工具的缺陷
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