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Consider a multi-granularity locking system, with lock modes S, X, IS, IX, and SIX as in lecture and database-level, file-level, page-level and record-level locking as shown in the following figure.     Provide the sequence of lock requests required to perform the following transactions and write necessary complete Lock and Unlock operations in their correct order.     T3 want to read all pages in F1 and modify about 10 pages, which can be identified only after reading F1.

Consider a multi-granularity locking system, with lock modes S, X, IS, IX, and SIX as in lecture and database-level, file-level, page-level and record-level locking as shown in the following figure.     Provide the sequence of lock requests required to perform the following transactions and write necessary complete Lock and Unlock operations in their correct order.     T3 want to read all pages in F1 and modify about 10 pages, which can be identified only after reading F1.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Consider a multi-granularity locking system, with lock modes S, X, IS, IX, and SIX as in lecture and database-level, file-level, page-level and record-level locking as shown in the following figure.

 

 

Provide the sequence of lock requests required to perform the following transactions and write necessary complete Lock and Unlock operations in their correct order.

 

 

  1. T3 want to read all pages in F1 and modify about 10 pages, which can be identified

only after reading F1.

(MY ANSWER)

Lock-SIX(DB); Lock-S(F1); Lock-X(P1); Lock-X(P1000);

Unlock(P1000); Unlock(P1); Unlock(F1); Unlock(DB);

 

is it corect?

………………………………………………………………………………………

Consider a multi-granularity locking system, with lock modes S, X, IS, IX, and SIX as in lecture and database-level, file-level, page-level and record-level locking as shown in the following figure. R₁ P1 R100 F1 P1000 DB R₁.. R100 R₁ P1001 F2 R100 P2000 R₁ R100 IS IS ✓ IX ✓ S ✓ SIX ✓ X X IX ✓ ✓ ✓ X X S SIX X X X ✓ X X X X X X Provide the sequence of lock requests required to perform the following transactions and write necessary complete Lock and Unlock operations in their correct order. X X X X X 1. T3 want to read all pages in F1 and modify about 10 pages, which can be identified only after reading F1. Lock-SIX(DB); Lock-S(F1); Lock-X(P1); Lock-X(P1000); Unlock(P1000); Unlock(P1); Unlock(F1); Unlock(DB);
Transcribed Image Text:Consider a multi-granularity locking system, with lock modes S, X, IS, IX, and SIX as in lecture and database-level, file-level, page-level and record-level locking as shown in the following figure. R₁ P1 R100 F1 P1000 DB R₁.. R100 R₁ P1001 F2 R100 P2000 R₁ R100 IS IS ✓ IX ✓ S ✓ SIX ✓ X X IX ✓ ✓ ✓ X X S SIX X X X ✓ X X X X X X Provide the sequence of lock requests required to perform the following transactions and write necessary complete Lock and Unlock operations in their correct order. X X X X X 1. T3 want to read all pages in F1 and modify about 10 pages, which can be identified only after reading F1. Lock-SIX(DB); Lock-S(F1); Lock-X(P1); Lock-X(P1000); Unlock(P1000); Unlock(P1); Unlock(F1); Unlock(DB);
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