【新題】OCP 12c 062認(rèn)證考試出現(xiàn)大量新題-5
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我要咨詢(xún)2018年的時(shí)候，OCP 11g考試題庫(kù)大更新，052 053出現(xiàn)了很多新題，
2019年，11g即將�？嫉那捌�，Oracle又出現(xiàn)了一次大變動(dòng)，12c出現(xiàn)了很多新題，比如062 063題庫(kù)大更新
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5.One of your databases supports an OLTP workload.
The default undo tablespace is fixed size with:
1. RETENTION NOGUARANTEE
2. undo_retention is 12 minutes
User scott get this error after a query on the sales table has run for more than 15 minutes:
ORA-01555: snapshot too old
Which three factors taken separately or in some combination might be the cause?
A) A committed delete to the sales table was made more than 12 minutes before the query began.
B) An uncommitted delete to the sales table was made more than 12 minutes before the query began.
C) A committed update to the sales table was made more than 12 minutes before the query began.
D) An uncommitted update to the sales table was made more than 12 minutes before the query began.
E) An update was made to the sales table before the query began.
F) An update to the SALES table was committed after the query began.
G) An update was made to the sales table after the query began.
Answer：ACF
(解析：題目的意思是：哪三個(gè)因素單獨(dú)或結(jié)合在一起可能是原因?快照太老是因?yàn)橐粋�(gè)長(zhǎng)時(shí)間運(yùn)行的查詢(xún)語(yǔ)句，所要查詢(xún)的對(duì)象在 undo 段找不到而產(chǎn)生的，找不到的原因是事務(wù)已經(jīng)提交了，原來(lái)使用的 undo 段被覆蓋。)
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