Which object may be used during query optimization to improve the performance for a subset of SELECT queries?（）A、MQTB、TriggerC、Read Only CursorD、Stored Procedure

题目

Which object may be used during query optimization to improve the performance for a subset of SELECT queries?（）

  • A、MQT
  • B、Trigger
  • C、Read Only Cursor
  • D、Stored Procedure
相似考题

1.Which of the listed devices may be used as a digital device?A.variable resistorB.diodeC.strain gaugeD.thermistor

2.Which statement is TRUE concerning buoyant work vests aboard tankers ________．A.They may be worn while working on deck but not while working over the sideB.They must be used only under supervision of a designated ship's officerC.They will be accepted for up to 10% of the required life preserversD.They may be worn during drills

3.The operation of which aids to navigation may be suspended during war or national emergency ________．A.Navigational satellitesB.LoranC.OmegaD.Any of the above

4.Coast Guard approved buoyant work vests ______．A.may be substituted for 10 percent of the required life preserversB.should be stowed adjacent to lifeboats and emergency stationsC.may be used by boat crews and line handlers during lifeboat drillsD.should be used when carrying out duties near a weather deck's edge

更多“Which object may be used during ”相关问题

  • 第1题：

    Even for one single connection, the retransmission time should not be fixed.A connection may be able to send segments and receive （74）faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection.

    A.connections
    B.requests
    C.acknowledgments
    D.datagrams

    答案：C
    解析：
    网络工程师

  • 第2题：

    Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）  

    • A、The value of an int is undetermined.
    • B、The value of all numeric types is zero.
    • C、The compiler may issue an error if the variable is used before it is initialized.
    • D、The value of a String variable is "" （empty string）.
    • E、The value of all object variables is null.

    正确答案:B,E

  • 第3题：

    Which of the following statements is true regarding the VERSIONS BETWEEN clause？（）  

    • A、 The VERSIONS BETWEEN clause may be used in DML statements.
    • B、 The VERSIONS BETWEEN clause may be used in DDL statements.
    • C、 The VERSIONS BETWEEN clause may not be used to query past DDL changes to tables.
    • D、 The VERSIONS BETWEEN clause may not be used to query past DML statements to tables.

    正确答案:C

  • 第4题：

    Which of the following OSPF messages contains entire complete LSAs used during the database exchange process?（）

    • A、LSR
    • B、LSAck
    • C、LSU
    • D、DD
    • E、Hello

    正确答案:C

  • 第5题：

    Which statement is true about the database and database-user used during installation of IMS Server？（）

    • A、A preexisting database user may be used but a new database has to be created during installation.
    • B、A preexisting database may be used but a new database user has to be created during installation.
    • C、A preexisting database and user may be used or a new database and user are created during installation.
    • D、A preexisting database and user cannot be used； a new database and user are created during  installation.

    正确答案:C

  • 第6题：

    Which is an example of a dynamic SELECT statement? （）

    • A、A query whose object names change during its execution. 
    • B、A query whose object names are not known until run time. 
    • C、A query whose bind variables values change during execution. 
    • D、A query whose bind variable values are not known until run time.

    正确答案:B

  • 第7题：

    单选题
    （）is a property of object-oriented software by which an abstract operation may be performed in different ways in different classes.
    A

    Method

    B

    Polymorphism

    C

    Inheritance

    D

    Encapsulation


    正确答案： A
    解析： 该题的关键词为"an abstract operation、 performed in different ways in different classes"，其语句结构为"（）is a property of object-oriented software"，含义为"什么是面向对象软件的一个特性"，结合关键词分析，容易判断这是面向对象中的多态性概念(Polymorphism)。

  • 第8题：

    多选题
    Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）
    A

    The value of an int is undetermined.

    B

    The value of all numeric types is zero.

    C

    The compiler may issue an error if the variable is used before it is initialized.

    D

    The value of a String variable is  （empty string）.

    E

    The value of all object variables is null.


    正确答案： B,E
    解析： 暂无解析

  • 第9题：

    多选题
    Which the two are true about the JSTL core iteration custom tags？（）
    A

    It may iterate over arrays， collections， maps and strings.

    B

    The body of the tag may contain EL code， but not scripting code.

    C

    When looping over collections， a loop status object may be used in the tag body.

    D

    It may iterate over a map， but only the key of the mapping may be used in the tag body.

    E

    When looping over integers （for example begin1=’1’ end=’10’）， a loop status object may not be used in the tag body.


    正确答案： A,C
    解析： 暂无解析

  • 第10题：

    单选题
    Which object may be used during query optimization to improve the performance for a subset of SELECT queries?（）
    A

    MQT

    B

    Trigger

    C

    Read Only Cursor

    D

    Stored Procedure


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    Which of the following statements is true regarding the VERSIONS BETWEEN clause？（）
    A

     The VERSIONS BETWEEN clause may be used in DML statements.

    B

     The VERSIONS BETWEEN clause may be used in DDL statements.

    C

     The VERSIONS BETWEEN clause may not be used to query past DDL changes to tables.

    D

     The VERSIONS BETWEEN clause may not be used to query past DML statements to tables.


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    When the engine room is put in standby condition, the engineer in charge of the watch need not to（）
    A

    ensure all machinery which may be used during maneuvering is in ready

    B

    ensure an adequate reserve of power is available for steering gear and other requirements

    C

    keep the main propulsion unit controls continuously attended when in the manual mode of operation

    D

    ensure all machinery which may be used during maneuvering is running stably


    正确答案： D
    解析： 暂无解析

  • 第13题：

    Which two statements are true about the hashCode method？（）

    • A、 The hashCode method for a given class can be used to test for object equality and object inequality for that class.
    • B、 The hashCode method is used by the java.util.SortedSet collection class to order theelements within that set.
    • C、 The hashCode method for a given class can be used to test for object inequality， but NOT object equality， for that class.
    • D、 The only important characteristic of the values returned by a hashCode method is that the distribution of values must follow a Gaussian distribution.
    • E、 The hashCode method is used by the java.util.HashSet collection class to group the elements within that set into hash buckets for swift retrieval.

    正确答案:C,E

  • 第14题：

    Which two are valid locking levels that are used by transactions in an Oracle database？（）

    • A、row level
    • B、block level
    • C、object level
    • D、schema level
    • E、database level

    正确答案:A,C

  • 第15题：

    Which two commands are used during the password recovery process?（）

    • A、clear system login
    • B、boot -s
    • C、recovery
    • D、delete system root-authentication

    正确答案:B,C

  • 第16题：

    Which command can be used to display information from the PvDv object class in the ODM？（）  

    • A、odmlist
    • B、odmshow
    • C、lsdev -P
    • D、lsattr -El

    正确答案:C

  • 第17题：

    The man page for command shows the following syntax: The man page for command shows the following syntax: command [ -a | -b ] Which of the following statements is true regarding this entry?（）

    • A、Either the -a or flag -b may be used, but not both.
    • B、If the flag -a is used then the flag -b also must be used.
    • C、One of the -a or -b flags must be used, but not both at the same time.
    • D、Both the flags may be used together, but neither are mandatory.

    正确答案:D

  • 第18题：

    单选题
    Which of the following OSPF messages contains entire complete LSAs used during the database exchange process?（）
    A

    LSR

    B

    LSAck

    C

    LSU

    D

    DD

    E

    Hello


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    Which class is used to specify a set of features to support on the XrnlReader object created by the Create method？（）
    A

    XmlReaderSettings

    B

    XmlSecureResolver

    C

    XmlValidatingReader

    D

    XmlTextReaderSelectMany（c => c.CustomerAddresses）.Count（）


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    The operation of which aids to navigation may be suspended during war or national emergency（）.
    A

    Navigational satellites

    B

    Loran

    C

    Omega

    D

    Any of the above


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    Which is an example of a dynamic SELECT statement? （）
    A

    A query whose object names change during its execution. 

    B

    A query whose object names are not known until run time. 

    C

    A query whose bind variables values change during execution. 

    D

    A query whose bind variable values are not known until run time.


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    Which statement is true about the database and database-user used during installation of IMS Server？（）
    A

    A preexisting database user may be used but a new database has to be created during installation.

    B

    A preexisting database may be used but a new database user has to be created during installation.

    C

    A preexisting database and user may be used or a new database and user are created during installation.

    D

    A preexisting database and user cannot be used； a new database and user are created during  installation.


    正确答案： C
    解析： 暂无解析

  • 第23题：

    多选题
    Which two statements are true about the hashCode method？（）
    A

    The hashCode method for a given class can be used to test for object equality and object inequality for that class.

    B

    The hashCode method is used by the java.util.SortedSet collection class to order theelements within that set.

    C

    The hashCode method for a given class can be used to test for object inequality， but NOT object equality， for that class.

    D

    The only important characteristic of the values returned by a hashCode method is that the distribution of values must follow a Gaussian distribution.

    E

    The hashCode method is used by the java.util.HashSet collection class to group the elements within that set into hash buckets for swift retrieval.


    正确答案： E,B
    解析： 暂无解析

  • 第24题：

    单选题
    Seawater may be used for drinking（）.
    A

    under no conditions

    B

    at a maximum rate of two ounces per day

    C

    if gathered during or immediately after a hard rain

    D

    after mixing with an equal quantity of fresh water


    正确答案： A
    解析： 暂无解析

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