单项选择题

YouaremaintainingyourOLTPdatabaseinOracle10g.Youhavenot……

YouaremaintainingyourOLTPdatabaseinOracle10g.YouhavenotsetthewarninglevelandcriticallevelthresholdvaluesforspaceusageoftheDATA1tablespace.Whatwillbetheimpact？（）

A.Nowarninglevelorcriticallevelalertwillbegenerated.
B.Awarninglevelalertwillneverbegenerated，butacriticallevelalertwillbegeneratedwhen97percentspaceoftheDATA1tablespaceisused.
C.Acriticallevelalertwillneverbegenerated，butawarninglevelalertwillbegeneratedwhen85percentspaceoftheDATA1tablespaceisused.
D.Awarninglevelalertwillbegeneratedat85percentspaceusageoftheDATA1tablespace，andacriticallevelalertisgeneratedat97percentspaceusageoftheDATA1tablespace.

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