一些操作不能撤销，因为其中调用了不在程序直接控制下的设备。
Some operations simply cannot be undone because they involve some action that triggers a device not under the direct control of the program.
对于使用DB2的外部应用程序(包括TE)，此插件允许直接控制用户和组身份验证。
For external applications that work with DB2, including te, this plug-in provides the means to directly control user and group authentication.
用户程序只能直接控制16个分段中的12个—即4 GB中的3gb。
The user program can only directly control 12 out of 16 segments - 3 out of 4gb.
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