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In your database server， the parameter PLSQL_OPTIMIZE_LEVEL has been set to 2. What would this setting achieve？（）
A:It degrades the run time and compiler performance.
B:It provides better run time and compiler performance.
C:It provides better optimization of the statement during parse time.
D:It forces the rule based optimizer to be used for statement optimization.
E:It provides better run time performance but slightly degraded compiler performance.
F:It provides better run time performance but slightly degraded run time performance.

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出自：Oracle认证

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