單項選擇題當(dāng)Oracle會話嘗試請求訪問本地實例buffer時,發(fā)現(xiàn)之前已經(jīng)有遠(yuǎn)程實例的session#2請求訪問該buffer,并且沒有完成,發(fā)生該事件時將產(chǎn)生以下哪種集群等待事件()

A.gc buffer busy acquire
B.gc buffer busy release
C.gc current block 2-way
D.gc current block 3-way


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1.單項選擇題oracle數(shù)據(jù)庫啟動一個空實例,至少需要哪一個參數(shù)()

A.control_files
B.memory_target
C.db_name
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2.單項選擇題當(dāng)需要undo來完成一致性讀時,下列說法正確的是()

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C.塊清除時匹配不到比snap_scn小的commit scn時,一定會報ORA-01555
D.當(dāng)undo段頭事務(wù)表slot被重用時,一定會報ORA-01555

4.單項選擇題在Oracle數(shù)據(jù)庫中,哪個SQL命令用于修改表的列的數(shù)據(jù)類型()

A.ALTER TABLE CHANGE COLUMN TYPE
B.ALTER TABLE TRANSLATE COLUMN TYPE TO NEW TYPE
C.ALTER TABLE ALTER COLUMN TYPE
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5.單項選擇題oracle數(shù)據(jù)中執(zhí)行查詢語句,以下哪個進(jìn)程從磁盤獲取數(shù)據(jù)()

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