Questions and Answers
What is the formula for calculating data transfer cost?
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?
61,500 bytes
Which strategy results in the least amount of data transfer when using semi-join in distributed query processing?
First strategy
What is the purpose of using the semi-join operator in distributed query processing?
Signup and view all the answers
How is the data transfer cost commonly calculated?
Signup and view all the answers
What does a distribution strategy for a query involve in a distributed database management system (DDBMS)?
Signup and view all the answers
In a Distributed DBMS, what is the significance of communication costs when obtaining data from multiple sites?
Signup and view all the answers
How does query processing in DDBMS differ from query processing in centralized DBMS?
Signup and view all the answers
What does the data transfer cost of distributed query processing include?
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?
Signup and view all the answers
What is the role of distribution strategy in query processing in a distributed database management system (DDBMS)?
Signup and view all the answers
What is the primary requirement for query processing in a distributed database management system (DDBMS)?
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)?
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
