Question 3: Assume that A, B, C, D, and E are data items, and that T1, T2, T3, T4, T5, and T6 are transactions. Assume that your DBMS is using shared/exclusive locks for concurrency control. Currently T1 has an exclusive lock on data item A, and T2 has a shared lock on data item C. All Use your knowledge in other data items are currently unlocked. concurrency control to answer the following questions. [around 6 minutes] Case (a) Consider the operations Read and Write. Which of these can T1 do it to A, given its lock (read, write, neither read nor write, or both read and write)? (b)Consider the operations Read and Write. Which of these can T2 do it to C, given its lock (read, write, neither read nor write, or both read and write)? (c) T3 requests an exclusive lock on D. Will T3 obtain the lock. at this point, or will T3 have to wait? (d) T4 requests a shared lock on C. Will T4 obtain the lock at this point, or will T4 have to wait? Answer

Question 3: Assume that A, B, C, D, and E are data items, and that T1, T2, T3, T4, T5, and T6 are transactions. Assume that your DBMS is using shared/exclusive locks for concurrency control. Currently T1 has an exclusive lock on data item A, and T2 has a shared lock on data item C. All Use your knowledge in other data items are currently unlocked. concurrency control to answer the following questions. [around 6 minutes] Case (a) Consider the operations Read and Write. Which of these can T1 do it to A, given its lock (read, write, neither read nor write, or both read and write)? (b)Consider the operations Read and Write. Which of these can T2 do it to C, given its lock (read, write, neither read nor write, or both read and write)? (c) T3 requests an exclusive lock on D. Will T3 obtain the lock. at this point, or will T3 have to wait? (d) T4 requests a shared lock on C. Will T4 obtain the lock at this point, or will T4 have to wait? Answer

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

Problem 1PE

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