單項(xiàng)選擇題當(dāng)Oracle會(huì)話嘗試請(qǐng)求訪問(wèn)本地實(shí)例buffer時(shí),發(fā)現(xiàn)之前已經(jīng)有遠(yuǎn)程實(shí)例的session#2請(qǐng)求訪問(wèn)該buffer,并且沒(méi)有完成,發(fā)生該事件時(shí)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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2.單項(xiàng)選擇題當(dāng)需要undo來(lái)完成一致性讀時(shí),下列說(shuō)法正確的是()

A.沒(méi)有活動(dòng)事務(wù)的block,一定不會(huì)出現(xiàn)ORA-01555
B.當(dāng)undo segment被刪除時(shí),一定會(huì)報(bào)ORA-01555
C.塊清除時(shí)匹配不到比snap_scn小的commit scn時(shí),一定會(huì)報(bào)ORA-01555
D.當(dāng)undo段頭事務(wù)表slot被重用時(shí),一定會(huì)報(bào)ORA-01555

4.單項(xiàng)選擇題在Oracle數(shù)據(jù)庫(kù)中,哪個(gè)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
D.ALTER TABLE MODIFY COLUMN TYPE

5.單項(xiàng)選擇題oracle數(shù)據(jù)中執(zhí)行查詢語(yǔ)句,以下哪個(gè)進(jìn)程從磁盤(pán)獲取數(shù)據(jù)()

A.服務(wù)器進(jìn)程(Server process)
B.數(shù)據(jù)庫(kù)寫(xiě)進(jìn)程(DBWR)
C.檢查點(diǎn)進(jìn)程(ckpt)
D.用戶進(jìn)程(user process)

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