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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 ( picture bellow ) I want to get "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 ( picture bellow ) I want to get "T3 want to read all pages in F1 and modify about 10 pages, which can be identified only after reading F1.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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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 ( picture bellow )

I want to get "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. R₁ P1 R100 P1000 R₁ DB R100 R₁ P1001 F2 R100 P2000 R₁ R100 IX IS IS ✓✓ IX S ✓ X ✓ SIX ✓ X < X 4. Can transactions T1 andT3 mentioned above execute concurrently? X X S < X ✓ X X X SIX 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 3. T3 want to read all pages in F1 and modify about 10 pages, which can be identified only after reading F1. X
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 P1000 R₁ DB R100 R₁ P1001 F2 R100 P2000 R₁ R100 IX IS IS ✓✓ IX S ✓ X ✓ SIX ✓ X < X 4. Can transactions T1 andT3 mentioned above execute concurrently? X X S < X ✓ X X X SIX 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 3. T3 want to read all pages in F1 and modify about 10 pages, which can be identified only after reading F1. X
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