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@@ -64,6 +64,12 @@ FileY := DATASET('~Training::SomeDir::SomeFileOut2',RecStruct,THOR);</programlis
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<para>Notice the presence of the scope name in both of these definitions.
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This is required because the files are in another scope.</para>
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+
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+ <para>You should be frugal with file scope usage. The depth of file scopes
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+ can have a performance cost in systems with File Scope Security enabled.
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+ This cost is higher still when File Scope Scans are enabled because the
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+ system must make an external LDAP call to check every level in the scope,
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+ from the top to the bottom.</para>
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</sect2>
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<sect2 id="Foreign_Files">
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