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Oracle9i extends the cursor sharing functionality with the new value of SIMILAR for the CURSOR_SHARING parameter. With CURSOR_SHARING = SIMILAR， cursors are shared for safe literals only. What is meant by ‘safe literals only’？（） 
A:No literal value is substituted for a shared cursor. 
B:Different execution plans are generated for substituted literal values. 
C:The substitution of a literal value will produce different execution plans. 
D:The substitution of any literal value will produce exactly the same execution plan.

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出自：Oracle认证

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