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)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Consider a multi-granularity locking system, with lock modes S, X, IS, IX, and SIX as in lecture and
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.
(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?
………………………………………………………………………………………
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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