Which&ensp;statement&ensp;is&ensp;true？（）<br /> <img src="https://nimg.ppkao.com/2018-08/zhoulian/2018080116161913701.jpg?sign=1fe402838cc401505309eb9f972853d2&t=62d51f19" />

A、The time to find the value from HashMap with a Person key depends on the size of the map.

B、Deleting a Person key from a HashMap will delete all map entries for all keys of type Person.

C、Inserting a second Person object into a HashSet will cause the first Person object to be removed as a duplicate.

D、The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.

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第1题

[单选题] You&ensp;are&ensp;configuring&ensp;the&ensp;data&ensp;source&ensp;for&ensp;an&ensp;Oracle&ensp;database.&ensp;You&ensp;will&ensp;need&ensp;to&ensp;specify&ensp;a&ensp;test&ensp;table&ensp;for&ensp;WebLogic&ensp;to&ensp;test&ensp;the&ensp;status&ensp;of&ensp;the&ensp;database. Which&ensp;option&ensp;should&ensp;you&ensp;choose?（）

A、a&ensp;table&ensp;name&ensp;which&ensp;has&ensp;100s&ensp;of&ensp;records B、a&ensp;table&ensp;name&ensp;which&ensp;has&ensp;10s&ensp;of&ensp;records C、a&ensp;table&ensp;name&ensp;which&ensp;has&ensp;empty&ensp;records D、a&ensp;table&ensp;name&ensp;which&ensp;has&ensp;1000s&ensp;of&ensp;records E、never&ensp;use&ensp;a&ensp;table&ensp;name

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第2题

[] Given&ensp;a&ensp;web&ensp;application&ensp;in&ensp;which&ensp;the&ensp;cookie&ensp;userName&ensp;is&ensp;expected&ensp;to&ensp;contain&ensp;the&ensp;name&ensp;of&ensp;the&ensp;user. Which EL&ensp;expression&ensp;evaluates&ensp;to&ensp;that&ensp;user&ensp;name？（） Given&ensp;a&ensp;web&ensp;application&ensp;in&ensp;which&ensp;the&ensp;cookie&ensp;userName&ensp;is&ensp;expected&ensp;to&ensp;contain&ensp;the&ensp;name&ensp;of&ensp;the&ensp;user. Which EL&ensp;expression&ensp;evaluates&ensp;to&ensp;that&ensp;user&ensp;name？（）

A、A.${userName} B、B.${cookie.userName} C、C.${cookie.user.name} D、D.${cookies.userName[0]}

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第3题

[单选题] You&ensp;are&ensp;developing&ensp;a&ensp;method&ensp;that&ensp;searches&ensp;a&ensp;string&ensp;for&ensp;a&ensp;substring.&ensp;The&ensp;method&ensp;will&ensp;be&ensp;localized&ensp;to&ensp;Italy.&ensp;&ensp;Your&ensp;method&ensp;accepts&ensp;the&ensp;following&ensp;parameters：&ensp; The&ensp;string&ensp;to&ensp;be&ensp;searched，&ensp;which&ensp;is&ensp;named&ensp;searchList&ensp; The&ensp;string&ensp;for&ensp;which&ensp;to&ensp;search，&ensp;which&ensp;is&ensp;named&ensp;searchValue&ensp;You&ensp;need&ensp;to&ensp;write&ensp;the&ensp;code.&ensp; Which&ensp;code&ensp;segment&ensp;should&ensp;you&ensp;use？（）

A、A B、B C、C D、D

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第4题

[单选题] Which statement is true about the UNDO_RETENTION parameter when retention guarantee is notenabled（）

A、It&ensp;is&ensp;the&ensp;time&ensp;period&ensp;after&ensp;which&ensp;the&ensp;undo&ensp;data&ensp;becomes&ensp;obsolete. B、It&ensp;is&ensp;the&ensp;time&ensp;period&ensp;after&ensp;which&ensp;the&ensp;committed&ensp;undo&ensp;data&ensp;would&ensp;be&ensp;transferred&ensp;to&ensp;a&ensp;temporarytablespace. C、It&ensp;is&ensp;the&ensp;minimum&ensp;time&ensp;period&ensp;up&ensp;to&ensp;which&ensp;the&ensp;committed&ensp;undo&ensp;data&ensp;would&ensp;be&ensp;retained&ensp;if&ensp;free&ensp;undo&ensp;spaceis&ensp;available. D、It&ensp;is&ensp;the&ensp;time&ensp;period&ensp;after&ensp;which&ensp;the&ensp;undo&ensp;data&ensp;is&ensp;transferred&ensp;to&ensp;the&ensp;Flash&ensp;Recovery&ensp;Area&ensp;to&ensp;provide&ensp;readconsistency.

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第5题

[单选题] Which statement is true about the UNDO_RETENTION parameter when retention guarantee is not enabled（）

A、It&ensp;is&ensp;the&ensp;time&ensp;period&ensp;after&ensp;which&ensp;the&ensp;undo&ensp;data&ensp;becomes&ensp;obsolete. B、It&ensp;is&ensp;the&ensp;time&ensp;period&ensp;after&ensp;which&ensp;the&ensp;committed&ensp;undo&ensp;data&ensp;would&ensp;be&ensp;transferred&ensp;to&ensp;a&ensp;temporary&ensp;tablespace. C、It&ensp;is&ensp;the&ensp;minimum&ensp;time&ensp;period&ensp;up&ensp;to&ensp;which&ensp;the&ensp;committed&ensp;undo&ensp;data&ensp;would&ensp;be&ensp;retained&ensp;if&ensp;free&ensp;undo&ensp;space&ensp;isavailable. D、It&ensp;is&ensp;the&ensp;time&ensp;period&ensp;after&ensp;which&ensp;the&ensp;undo&ensp;data&ensp;is&ensp;transferred&ensp;to&ensp;the&ensp;Flash&ensp;Recovery&ensp;Area&ensp;to&ensp;provide&ensp;readconsistency.

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第6题

[] You work as a database administrator for Supportcenter.cn. Your database is opened inNOARCHIVEKLOG mode. You decide to place the database in ARCHIVELOG mode. How would you do this？（）

A、A.Execute&ensp;the&ensp;ALTER&ensp;DATABASE&ensp;ARCHIVELOG&ensp;statement B、B.Select&ensp;ARCHIVELOG&ensp;option&ensp;in&ensp;the&ensp;database&ensp;control&ensp;and&ensp;restart&ensp;the&ensp;database&ensp;to&ensp;apply&ensp;the&ensp;changes. C、C.Shut&ensp;down&ensp;and&ensp;start&ensp;the&ensp;instance，&ensp;and&ensp;in&ensp;the&ensp;NOMOUNT&ensp;state&ensp;execute&ensp;the&ensp;ALTER&ensp;DATABASE&ensp;ARCHIVELOG&ensp;statement. D、D.Shut&ensp;down&ensp;and&ensp;start&ensp;the&ensp;instance，&ensp;mount&ensp;the&ensp;database，&ensp;then&ensp;execute&ensp;the&ensp;ALTER&ensp;DATABASE&ensp;ARCHIVELOG&ensp;statement.

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第7题

[多选题] SDM creates a low latency queuing （LLO） service policy with its associated classes. What are the two types of low latency queuing available using the SDM OoS wizard？（）

A、FIFO&ensp;queuing，&ensp;which&ensp;provides&ensp;a&ensp;means&ensp;to&ensp;hold&ensp;packets&ensp;while&ensp;they&ensp;are&ensp;waiting&ensp;to&ensp;exit&ensp;an&ensp;interface B、Priority&ensp;queuing，&ensp;which&ensp;ensures&ensp;a&ensp;fixed&ensp;amount&ensp;of&ensp;bandwidth C、Custom&ensp;queuing&ensp;（CO），&ensp;which&ensp;provides&ensp;a&ensp;queuing&ensp;tool&ensp;that&ensp;services&ensp;all&ensp;queues，&ensp;even&ensp;during&ensp;times&ensp;of&ensp;congestion D、Bandwidth&ensp;queuing，&ensp;which&ensp;ensures&ensp;a&ensp;minimum&ensp;amount&ensp;of&ensp;bandwidth E、Weighted&ensp;fair&ensp;queuing&ensp;（WFO），&ensp;which&ensp;classifies&ensp;packets&ensp;based&ensp;on&ensp;flows

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第8题

[多选题] SDM creates a low latency queuing （LLQ） service policy with its associated classes. What are the two types of low latency queuing available using the SDM QoS wizard？（）

A、&ensp;FIFO&ensp;queuing，&ensp;which&ensp;provides&ensp;a&ensp;means&ensp;to&ensp;hold&ensp;packets&ensp;while&ensp;they&ensp;are&ensp;waiting&ensp;to&ensp;exit&ensp;an&ensp;interface B、&ensp;Priority&ensp;queuing，&ensp;which&ensp;ensures&ensp;a&ensp;fixed&ensp;amount&ensp;of&ensp;bandwidth C、&ensp;Custom&ensp;queuing&ensp;（CQ），&ensp;which&ensp;provides&ensp;a&ensp;queuing&ensp;tool&ensp;that&ensp;services&ensp;all&ensp;queues，&ensp;even&ensp;during&ensp;times&ensp;of&ensp;congestion D、&ensp;Bandwidth&ensp;queuing，&ensp;which&ensp;ensures&ensp;a&ensp;minimum&ensp;amount&ensp;of&ensp;bandwidth E、&ensp;Weighted&ensp;fair&ensp;queuing&ensp;（WFQ），&ensp;which&ensp;classifies&ensp;packets&ensp;based&ensp;on&ensp;flows