Chứng Chỉ Quốc Tế CNTT > Database Oracle - MySQL > Bộ đề trắc nghiệm luyện thi Oracle9i:Performance Tunning 2

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Hiển thị câu hỏi  
   -  Số lượng câu hỏi     
  • 1
     You determined that the value for REQUEST_FAILURES as seen from 
    V$SHARED_POOL_RESERVED is more than zero and always increasing. 
    Which action would be appropriate? 
  • 2
    Which four are likely to be the cause of poor database performance? (Choose four) 
      
  • 3
    You are importing a table and you want to ensure that the table is put into a single 
    contiguous area. There is not a single contiguous area large enough for the entire 
    space allocated to the table. 
    Which two actions below could help you achieve your goal? (Choose two)  
  • 4
    Which statement demonstrates a correct understanding of common tuning 
    problems? 
  • 5
    As a conscientious Certkiller DBA you are aware that tuning should begin at the 
    initial stage of the application development phase. 
    Assuming you have optimal data model and data file layout to eliminate hot spots, what 
    is the next step you should take to isolate the problems that may cause poor database 
    performance? 
  • 6
    There are some parameters DBAs need to set in init<SID>.ora while configuring the 
    Oracle Shared Server. 
    Which parameter should be set to a small value because Oracle dynamically adjust the 
    value based on the length of the request queue?  
  • 7
     
    What is the initialization parameter PGA_AGGREGATE_TARGET used for?  
  • 8
    You work as a programmer at Certkiller Inc. During the application development 
    phase, you receive complaints from the Certkiller application developers that the 
    database is slow while queuing certain tables. The application is a DSS application 
    that has been in development for the past 6 months, but the database slowdown has 
    been experienced only recently. 
    The server is dedicated to one Oracle database instance that hosts the application, 
    and has 1 gigabyte of physical memory. You followed memory-tuning guidelines 
    and allocated approximately 164 megabytes for the total SG 
    A. Using one of the 
    database performance diagnostic tools, you confirmed the following: 
    1. The statistics are captured for the duration of 1 hour. 
    2. Buffer cache hit ratio is average of 73%. 
    3. Library cache hit ratio is average of 98%. 
    4. Disk sort ratio is average of 0.2% per transaction. 
    5. Sum of the long table scans is average of 13.5 per transaction. 
    6. Sum of the physical block reads of each tablespace is average of 0 with the 
    exception of one tablespace that has the value of 2306797. 
    What is the first action you should consider? 
  • 9
    Which statement describes how execution plans can be stabilized across Oracle releases, 
    database changes, and other factors that normally cause an execution plan to change?  
  • 10
     
    In order to avoid validation errors, every resource plan directive must include which 
    resource consumer plan? 
      

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