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1
GATE CSE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
Consider the following four schedules due to three transactions (indicated by the subscript) using read and write on a data item x, denoted by r(x) and w(x) respectively. Which one of them is conflict serializable?
A
r1(x); r2(x); w1(x); r3(x); w2(x)
B
r2(x); r1(x); w2(x); r3(x); w1(x)
C
r3(x); r2(x); r1(x); w2(x); w1(x)
D
r2(x); w2(x); r3(x); r1(x); w1(x)
2
GATE CSE 2012
MCQ (Single Correct Answer)
+2
-0.6
Consider the following transactions with data items P and Q initialized to zero: 
T1 : read (P) ; 
     read (Q) ; 
     if P = 0 then Q : = Q + 1 ; 
     write (Q). 
T2 : read (Q) ; 
     read (P) 
     if Q = 0 then P : = P + 1 ; 
     write (P).
Any non-serial interleaving of T1 and T2 for concurrent execution leads to
A
a serializable schedule
B
a schedule that is not conflict serializable
C
a conflict serializable schedule
D
a schedule for which precedence graph cannot be drawn
3
GATE CSE 2010
MCQ (Single Correct Answer)
+2
-0.6
Consider the following schedule for transactions T1, T2 and T3: GATE CSE 2010 Database Management System - Transactions and Concurrency Question 21 English Which one of the schedules below is the correct serialization of the above?
A
$$T1 \to T3 \to T2$$
B
$$T2 \to T1 \to T3$$
C
$$T2 \to T3 \to T1$$
D
$$T3 \to T1 \to T2$$
4
GATE CSE 2009
MCQ (Single Correct Answer)
+2
-0.6
Consider two transactions T1 and T2 and four schedules S1, S2, S3, S4 of T1 and T2 as given below:

T1: R1[ x ] W1[ x ] W1[ y ]
T2: R2[ x ] R2[ y ] W2[ y ]
S1: R1[ x ] R2[ x ] R2[ y ] W1[ x ] W1[ y ] W2[ y ]
S2: R1[ x ] R2[ x ] R2[ y ] W1[ x ] W2[ y ] W1[ y ]
S3: R1[ x ] W1[ x ] R2[ x ] W1[ y ] R2[ y ] W2[ y ]
S4: R2[ x ] R2[ y ] R1[ x ] W1[ x ] W1[ y ] W2[ y ]

Which of the above schedules are conflict-serializable?
A
S1 and S2
B
S2 and S3
C
S3 only
D
S4 only
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GATE CSE Subjects
Theory of Computation
Undecidability Finite Automata and Regular Language Push Down Automata and Context Free Language Recursively Enumerable Language and Turing Machine
Operating Systems
Process Concepts and Cpu Scheduling Synchronization and Concurrency Deadlocks Memory Management File System IO and Protection
Algorithms
Complexity Analysis and Asymptotic Notations Searching and Sorting Divide and Conquer Method Greedy Method P and NP Concepts Dynamic Programming
Digital Logic
Number Systems Boolean Algebra K Maps Combinational Circuits Sequential Circuits
Database Management System
Structured Query Language Transactions and Concurrency Functional Dependencies and Normalization Relational Algebra File Structures and Indexing Er Diagrams
Data Structures
Arrays Stacks and Queues Linked List Trees Graphs Hashing
Computer Networks
Network Security Data Link Layer and Switching Application Layer Protocol Network Layer Routing Algorithm Concepts of Layering Lan Technologies and Wi-Fi TCP UDP Sockets and Congestion Control
Software Engineering
Software Engineering
Compiler Design
Lexical Analysis Parsing Syntax Directed Translation Code Generation and Optimization
Web Technologies
Web Technologies
General Aptitude
Numerical Ability Logical Reasoning Verbal Ability
Discrete Mathematics
Graph Theory Set Theory & Algebra Combinatorics Mathematical Logic Probability Linear Algebra Calculus
Programming Languages
Basic of Programming Language Function and Recursion Pointer and Structure in C
Computer Organization
Computer Arithmetic Memory Interfacing Pipelining Machine Instructions and Addressing Modes Alu Data Path and Control Unit IO Interface Secondary Memory
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