Answer the following questions about data on external storage in a DBMS: 1. Why does a DBMS
Question:
1. Why does a DBMS store data on external storage?
2. Why are I/O costs important in a DBMS?
3. What is a record id? Given a record's id, how many I/Os are needed to fetch it into main memory?
4. What is the role of the buffer manager in a DBMS? What is the role of the disk space manager? How do these layers interact with the file and access methods layer?
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The answer to each question is given below 1 A DBMS stores data on external storage because the quan...View the full answer
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Related Book For 
Database management systems
ISBN: 978-0072465631
3rd edition
Authors: Raghu Ramakrishan, Johannes Gehrke, Scott Selikoff
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