Access Control Models and Mechanisms Quiz
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Questions and Answers

Which type of index is defined as having the order of data records the same as, or close to, the order of data entries?

  • Dense index
  • Clustered index (correct)
  • Sparse index
  • Unclustered index

    • A file can be clustered on how many search keys?

  • One (correct)
  • None
  • Two
  • Multiple

    • Which type of index is smaller in size?

  • Dense index
  • Sparse index (correct)
  • Clustered index
  • Unclustered index

    • Which type of index is always dense?

    <p>Dense index</p> Signup and view all the answers

    Which type of query involves a combination of fields and every field value being equal to a constant value?

    <p>Equality query</p> Signup and view all the answers

    Which type of access control is based on the data owner determining who can access specific resources?

    <p>Discretionary Access Control (DAC)</p> Signup and view all the answers

    Which type of access control allows the policy designer to define a security policy independently of the implementation?

    <p>Organization-Based Access control (OrBAC)</p> Signup and view all the answers

    Which access control model is largely context-based?

    <p>Rule-Based Access Control (RAC)</p> Signup and view all the answers

    What is the process of encoding a message or information in such a way that only authorized parties can access it?

    <p>Encryption</p> Signup and view all the answers

    Which type of encryption uses the same key for both encryption and decryption?

    <p>Symmetric key encryption</p> Signup and view all the answers

    What is the purpose of database auditing?

    <p>To prevent unauthorized access</p> Signup and view all the answers

    Which recovery algorithm is designed to work with a steal, no-force approach?

    <p>Aries</p> Signup and view all the answers

    What is the first phase of the crash recovery process?

    <p>Analysis</p> Signup and view all the answers

    What is the purpose of the log in a database management system?

    <p>To recover from system crashes</p> Signup and view all the answers

    Which type of log record is appended to the log after modifying a page?

    <p>Update</p> Signup and view all the answers

    What is the purpose of a commit type log record?

    <p>To force-write a transaction's changes</p> Signup and view all the answers

    What type of log record is appended to the log when a transaction is aborted?

    <p>Abort</p> Signup and view all the answers

    What additional action is taken when a transaction is aborted or committed?

    <p>A compensation log record is written</p> Signup and view all the answers

    What does the transID field in a log record represent?

    <p>The transaction ID</p> Signup and view all the answers

    What is the purpose of checkpointing in a DBMS?

    <p>All of the above</p> Signup and view all the answers

    What are the three steps involved in checkpointing?

    <p>Begin_checkpoint, End_checkpoint, Afterend_checkpoint</p> Signup and view all the answers

    What is stored in the Dirty Page Table of a DBMS?

    <p>The pageLSN and pageID of each data page</p> Signup and view all the answers

    Which of the following is an example of a DBMS?

    <p>MySQL</p> Signup and view all the answers

    Which of the following is true about indexes on a file?

    <p>Indexes can only be created on the search key fields of a relation.</p> Signup and view all the answers

    Which of the following is true about search key and key in relation to indexes?

    <p>Search key is a minimal set of fields that uniquely identify a record in a relation.</p> Signup and view all the answers

    Which of the following is true about the alternatives for data entries in an index?

    <p>Alternative 2 is the most compact and efficient for small data records.</p> Signup and view all the answers

    Which of the following is true about the number of indexes that can use Alternative 1 for a given collection of data records?

    <p>At most one index can use Alternative 1.</p> Signup and view all the answers

    Which of the following is true about the size of auxiliary information in an index?

    <p>The size of auxiliary information in an index is typically small for large data records.</p> Signup and view all the answers

    Which of the following is true about the alternatives for data entries in an index?

    <p>Alternative 3 is the most compact and efficient for large data entries.</p> Signup and view all the answers

    Which of the following is true about the classification of indexes?

    <p>Primary index is based on the primary key.</p> Signup and view all the answers

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