Query Processing in Distributed Database Management Systems
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Questions and Answers

What is the formula for calculating data transfer cost?

  • Data transfer cost = C / Size
  • Data transfer cost = C + Size
  • Data transfer cost = C * Size (correct)
  • Data transfer cost = C - Size

    • What is the total cost of transferring both the EMPLOYEE and DEPARTMENT tables to SITE 3 and then joining them there?

  • 60,000 bytes
  • 41,500 bytes
  • 61,500 bytes (correct)
  • 100,000 bytes

    • Which strategy results in the least amount of data transfer when using semi-join in distributed query processing?

  • It depends on other factors
  • Second strategy
  • First strategy (correct)
  • Third strategy

    • What is the purpose of using the semi-join operator in distributed query processing?

    <p>To reduce the total cost of data transfer</p> Signup and view all the answers

    How is the data transfer cost commonly calculated?

    <p>In terms of the number of bytes transmitted</p> Signup and view all the answers

    What does a distribution strategy for a query involve in a distributed database management system (DDBMS)?

    <p>Ordering of data transmissions and local data processing</p> Signup and view all the answers

    In a Distributed DBMS, what is the significance of communication costs when obtaining data from multiple sites?

    <p>It results in transmission of data causing communication costs</p> Signup and view all the answers

    How does query processing in DDBMS differ from query processing in centralized DBMS?

    <p>DDBMS involves data transfer over the network and communication cost is a significant factor</p> Signup and view all the answers

    What does the data transfer cost of distributed query processing include?

    <p>Cost of transferring intermediate files to other sites for processing and the cost of transferring the ultimate result files</p> Signup and view all the answers

    What are the three strategies mentioned for processing a query that requires data from multiple sites in Distributed Query Processing?

    <p>Broadcast, Gather, and Pipelined strategies</p> Signup and view all the answers

    What is the role of distribution strategy in query processing in a distributed database management system (DDBMS)?

    <p>It determines the ordering of data transmissions and local data processing</p> Signup and view all the answers

    What is the primary requirement for query processing in a distributed database management system (DDBMS)?

    <p>Transmission of data between computers in a network</p> Signup and view all the answers

    What is the significance of communication costs in obtaining data from multiple sites in a Distributed Database Management System (DDBMS)?

    <p>Communication costs impact the efficiency and performance of query processing</p> Signup and view all the answers

    Study Notes

    Distributed Query Processing

    • Data transfer cost is a crucial factor in distributed query processing.

    Calculating Data Transfer Cost

    • The formula for calculating data transfer cost is not specified, but it is a significant consideration in distributed query processing.

    Distributed Query Processing Strategies

    • There are three strategies for processing a query that requires data from multiple sites:
      • Not specified, but includes data transfer between sites.
    • The strategy that results in the least amount of data transfer when using semi-join in distributed query processing is not specified.

    Semi-Join Operator

    • The semi-join operator is used in distributed query processing to reduce data transfer.
    • The purpose of using the semi-join operator is to minimize data transfer between sites.

    Data Transfer Cost Calculation

    • Data transfer cost is commonly calculated by considering the amount of data transferred between sites.

    Distribution Strategy

    • A distribution strategy for a query involves deciding which site will process the query and how data will be transferred between sites in a distributed database management system (DDBMS).
    • The role of distribution strategy in query processing is to minimize data transfer cost and optimize query performance.

    Query Processing in DDBMS

    • Query processing in a Distributed DBMS differs from query processing in centralized DBMS in that it involves data transfer between multiple sites.
    • The primary requirement for query processing in a distributed database management system (DDBMS) is to minimize data transfer cost and optimize query performance.

    Communication Costs

    • Communication costs are significant when obtaining data from multiple sites in a Distributed Database Management System (DDBMS).
    • The significance of communication costs lies in the data transfer cost between sites.

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    Description

    Explore the concepts and techniques involved in query processing for distributed database management systems, including transmission of data between computers in a network and distribution strategies for queries. Understand the challenges and methods for data retrieval from multiple sites in a distributed DBMS.

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