Query Processing in Databases
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Questions and Answers

What is the primary function of a parser in query processing?

  • Checking query syntax compliance (correct)
  • Identifying query tokens
  • Determining disk access speed
  • Validating attribute names

    • Which factor is a major contributor to the total time cost in executing a query?

  • Memory operation speed
  • Disk accesses (correct)
  • Network communication cost
  • CPU time to execute a query

    • Why is disk access considered a predominant cost in query processing?

  • It doesn't involve any time cost
  • It is faster than in-memory operations
  • Disk access is generally slower than in-memory operations (correct)
  • It consumes less CPU time

    • What is the reason for the cost of writing a block being greater than reading a block in query processing?

    <p>Writing confirmation check</p> Signup and view all the answers

    What does the scanner do during query processing?

    <p>Identifies query tokens</p> Signup and view all the answers

    What is the cost of linear search in the best case scenario?

    <p>(br / 2)</p> Signup and view all the answers

    What condition allows the system to stop searching in linear search?

    <p>Selection based on a primary key attribute</p> Signup and view all the answers

    Which algorithm is faster between linear search and binary search?

    <p>Binary search</p> Signup and view all the answers

    What is the primary advantage of pipelining over materialization in evaluating expressions?

    <p>Reduces number of intermediate temporary relations</p> Signup and view all the answers

    What is query optimization primarily focused on?

    <p>Selecting the most efficient query evaluation plan</p> Signup and view all the answers

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