单选题Which of the following statements is TRUE concerning the po column of the vmstat command?()AThe sys is high when po is high.BThe po represents the number of page steals.CThe low values usually indicate insufficient paging space.DThe low values usually 

题目
单选题
Which of the following statements is TRUE concerning the po column of the vmstat command?()
A

 The sys is high when po is high.

B

 The po represents the number of page steals.

C

 The low values usually indicate insufficient paging space.

D

 The low values usually indicate sufficient memory for the load.


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更多“单选题Which of the following statements is TRUE concerning the po column of the vmstat command?()A  The sys is high when po is high.B  The po represents the number of page steals.C  The low values usually indicate insufficient paging space.D  The low values ”相关问题
  • 第1题:

    Using output from "vmstat 2 8," which of the following options is most appropriate to consider when determining if a system is experiencing memory thrashing?()

    • A、 cy != 1 
    • B、 re != 0 
    • C、 po/fr > 1/6 
    • D、 fr/po > 1/6

    正确答案:C

  • 第2题:

    When monitoring a system using vmstat with an interval, the metrics under page po represent which of the following phrases?() 

    • A、 The number pages over the limit
    • B、 The pages to paging space per second
    • C、 The number of page operations per second
    • D、 The number of processes waiting for page out

    正确答案:B

  • 第3题:

    When monitoring a system using vmstat with an interval, which of the following conclusions should be drawn about the metrics under page pi and page po?()

    • A、 The values do not include working storage.
    • B、 The values do not include persistent storage.
    • C、 The values include both persistent and working storage.
    • D、 The values are not working or persistent storage.

    正确答案:B

  • 第4题:

    A system administrator is monitoring a system that has recently shown a decrease in performance.The administrator suspects that the system may be low on memory and may be paging excessively.Which of the following commands is best to identify a possible paging problem?()

    • A、iostat
    • B、netstat
    • C、ps
    • D、vmstat

    正确答案:D

  • 第5题:

    Evaluate the following command:   SQL> CREATE TABLE design_data (id NUMBER, doc CLOB)  LOB(doc) STORE AS SECUREFILE(DEDUPLICATE);   Which statement is true regarding the above command?()  

    • A、 The LOB values are automatically compressed.
    • B、 The LOB values are cached by default in the buffer cache.
    • C、 The LOB values are automatically stored in encrypted mode.
    • D、 All LOB data that is identical in two or more rows in a LOB column share the same data blocks.

    正确答案:D

  • 第6题:

    单选题
    When monitoring a system using vmstat with an interval, which of the following conclusions should be drawn about the metrics under page pi and page po?()
    A

     The values do not include working storage.

    B

     The values do not include persistent storage.

    C

     The values include both persistent and working storage.

    D

     The values are not working or persistent storage.


    正确答案: C
    解析: 暂无解析

  • 第7题:

    单选题
    Using output from "vmstat 2 8," which of the following options is most appropriate to consider when determining if a system is experiencing memory thrashing?()
    A

     cy != 1 

    B

     re != 0 

    C

     po/fr > 1/6 

    D

     fr/po > 1/6


    正确答案: D
    解析: 暂无解析

  • 第8题:

    单选题
    An AIX system administrator wants to reset the level at which the SIGDANGER signal is sent to processes so appropriate actions can be taken when paging space is running low.  Which of the following commands is used to reset the level?()
    A

     vmtune -w

    B

     svmon -w

    C

     schedtune -w

    D

     vmstat -s


    正确答案: A
    解析: 暂无解析

  • 第9题:

    单选题
    When monitoring a system using /usr/bin/vmstat with an interval, the metrics under page pi and page po represent which of the following phrases?()
    A

     The pages to and from paging space per second

    B

     The page intervals and page operations per second

    C

     The page interrupts and page operations per second

    D

     The page segments transferred between pi and po devices per second


    正确答案: B
    解析: 暂无解析

  • 第10题:

    单选题
    The system administrator has been getting complaints about slow performance from the server. After running vmstat the administrator notices average readings that show the free list (fre) approaching zero, as well as page-in (pi) and page-out (po) values to be high. Furthermore, the applications running are essential to daily business operations. Which of the following recommendations would provide the best overall improvement?()
    A

     Increase physical disk

    B

     Increase number of CPU’s

    C

     Increase physical memory

    D

     Increase number of servers


    正确答案: C
    解析: 暂无解析

  • 第11题:

    单选题
    Evaluate the following command:   SQL> CREATE TABLE design_data (id NUMBER, doc CLOB)  LOB(doc) STORE AS SECUREFILE(DEDUPLICATE);   Which statement is true regarding the above command?()
    A

     The LOB values are automatically compressed.

    B

     The LOB values are cached by default in the buffer cache.

    C

     The LOB values are automatically stored in encrypted mode.

    D

     All LOB data that is identical in two or more rows in a LOB column share the same data blocks.


    正确答案: A
    解析: 暂无解析

  • 第12题:

    单选题
    When monitoring a system using vmstat with an interval, the metrics under page po represent which of the following phrases?()
    A

     The number pages over the limit

    B

     The pages to paging space per second

    C

     The number of page operations per second

    D

     The number of processes waiting for page out


    正确答案: D
    解析: 暂无解析

  • 第13题:

    Which of the following statements is TRUE concerning the po column of the vmstat command?()

    • A、 The sys is high when po is high.
    • B、 The po represents the number of page steals.
    • C、 The low values usually indicate insufficient paging space.
    • D、 The low values usually indicate sufficient memory for the load.

    正确答案:D

  • 第14题:

    After running the vmstat command, which of the following would most likely cause the value in the blocked column to be unusually high?()

    • A、 Kernel thread
    • B、 Too many users
    • C、 Memory shortage
    • D、 Network contention

    正确答案:A

  • 第15题:

    An AIX system administrator wants to reset the level at which the SIGDANGER signal is sent to processes so appropriate actions can be taken when paging space is running low.  Which of the following commands is used to reset the level?()

    • A、 vmtune -w
    • B、 svmon -w
    • C、 schedtune -w
    • D、 vmstat -s

    正确答案:A

  • 第16题:

    Which two statements are true about a bitmap index? ()

    • A、It is recommended for the columns that have unique values.
    • B、It can be converted to a B-tree index by using the ALTER INDEX command.
    • C、It has a bitmap segment for each distinct value in the key column, containing a string of bits in which each bit represents the presence or absence of a key column value.
    • D、Updating the key column locks the whole bitmap segment that contains the bit for the key value to be updated.

    正确答案:C,D

  • 第17题:

    Evaluate the following statements:   CREATE TABLE purchase_orders (po_id NUMBER(4),  po_date TIMESTAMP, supplier_id NUMBER(6), po_total NUMBER(8,2),  CONSTRAINT order_pk PRIMARY KEY(po_id)) PARTITION BY RANGE(po_date)  (PARTITION Q1 VALUES LESS THAN (TO_DATE(?1-apr-2007?d-mon-yyyy?), PARTITION Q2 VALUES LESS THAN  (TO_DATE(?1-jul-2007?d-mon-yyyy?),  PARTITION Q3 VALUES LESS THAN(TO_DATE(?1-oct - 2007?d-mon-yyyy?), PARTITION Q4 VALUES LESS THAN (TO_DATE(?1-jan-2008?d-mon-yyyy?));  CREATE TABLE purchase_order_items (po_id NUMBER(4) NOT NULL, product_id NUMBER(6) NOT NULL, unit_price NUMBER(8,2), quantity NUMBER(8), CONSTRAINT po_items_fk FOREIGN KEY  (po_id) REFERENCES purchase_orders(po_id)) PARTITION BY REFERENCE(po_items_fk);   What are the two consequences of the above statements?()

    • A、 Partitions of PURCHASE_ORDER_ITEMS have system-generated names.
    • B、 Both PURCHASE_ORDERS and PURCHASE_ORDER_ITEMS tables are created with four partitions each. 
    • C、 Partitions of the PURCHASE_ORDER_ITEMS table exist in the same tablespaces as the partitions of the PURCHASE_ORDERS table.
    • D、 The PURCHASE_ORDER_ITEMS table inherits the partitioning key from the parent table by  automatically duplicating the key columns.
    • E、 Partition maintenance operations performed on the PURCHASE_ORDER_ITEMS table are automatically reflected in the PURCHASE_ORDERS table.

    正确答案:B,C

  • 第18题:

    单选题
    Which statement is TRUE concerning equatorial tides().
    A

    They occur when the Sun is at minimum declination north or south

    B

    They occur when the Moon is at maximum declination north or south

    C

    The difference in height between consecutive high or low tides is at a minimum

    D

    They are used as the basis for the vulgar establishment of the port


    正确答案: D
    解析: 暂无解析

  • 第19题:

    多选题
    Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)
    A

    c=d

    B

    l and k are parallel

    C

    m and l are perpendicular


    正确答案: C,B
    解析:
    根据题目中的已知信息无法推断出各直线的关系,因此B、C均不正确;而由图示可知,c和d分别是a和b的补角,由于a=b,所以c=d,A项正确。

  • 第20题:

    单选题
    After running the vmstat command, which of the following would most likely cause the value in the blocked column to be unusually high?()
    A

     Kernel thread

    B

     Too many users

    C

     Memory shortage

    D

     Network contention


    正确答案: C
    解析: 暂无解析

  • 第21题:

    单选题
    Which of the following statements is TRUE concerning the po column of the vmstat command?()
    A

     The sys is high when po is high.

    B

     The po represents the number of page steals.

    C

     The low values usually indicate insufficient paging space.

    D

     The low values usually indicate sufficient memory for the load.


    正确答案: B
    解析: 暂无解析

  • 第22题:

    单选题
    Which of the following statements is true concerning the cetane number of diesel fuel?()
    A

    The cetane number affects the amount of injection lag

    B

    The cetane number is an indication of the fuels viscosity

    C

    Ignition lag is reduced with fuels having a high cetane number

    D

    The cetane number is of little significance in the combustion process


    正确答案: C
    解析: 暂无解析

  • 第23题:

    多选题
    Which two statements are true about a bitmap index? ()
    A

    It is recommended for the columns that have unique values.

    B

    It can be converted to a B-tree index by using the ALTER INDEX command.

    C

    It has a bitmap segment for each distinct value in the key column, containing a string of bits in which each bit represents the presence or absence of a key column value.

    D

    Updating the key column locks the whole bitmap segment that contains the bit for the key value to be updated.


    正确答案: D,A
    解析: 暂无解析

  • 第24题:

    单选题
    Evaluate the following command: Which statement is true regarding the above command?()
    A

    The LOB matically compressed.

    B

    The LOB values are cached bvalues are autoy default in the buffer cache.

    C

    The LOB values are automatically stored in encrypted mode.

    D

    All LOB data that is identical in two or more rows in a LOB column share the same data blocks.


    正确答案: C
    解析: 暂无解析