answer please fast
1. Consider the functional dependency of relation R (A, B, C) FD= {A→BC, B→C, A→B, AB→C} Now
find the canonical cover.
2. Consider the following schedule of transaction T1 , T2 and T3
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Consider the following schedule. The actions are prefixed with the transaction name and are listed in...
Consider the following schedule. The actions are prefixed with the transaction name and are listed in the order they’re scheduled. S: T2:R(Y), T1:R(X), T1:W(X), T3:R(Y), T3:W(X), T1:W(Z), T2:R(X), T3:R(Z) a. Draw the dependency graph for S. b. Is S serializable? c. Is S conflict serializable? If so, what is the conflict equivalent serial schedule?
please do question 4. Note that we follow the convention of denoting the set of attributes...
please do question 4.
Note that we follow the convention of denoting the set of attributes {A, B, C} by ABC when we write FDs but not when we write schemas. Given the following set set F of FDs on schema R= (A, B, C, D, E,G): A + BC AB + CD B +C E →D G +C EG → AD Answer the following questions. Questions 1-4 require a formal proof or disproof. A proof may be given either...
Language: SQL - Normalization and Functional Dependencies Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold o...
Language: SQL - Normalization and Functional
Dependencies
Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold over this relation. F=D → C, A B,A-C Question 4.1 (3 Points) Determine all candidate keys of R Question 4.2 (4 Points) Compute the attribute cover of X-(C, B) according to F Question 43 (5 Points) Compute the canonical cover of F.Show each step of the generation according to the algorithm shown in class....
Alpha closure and canonical cover. Consider relation R (ABCDEFG) and the F = {AC->B, AB->C, ACD->BE,...
Alpha closure and canonical cover. Consider relation R (ABCDEFG) and the F = {AC->B, AB->C, ACD->BE, C->D, E->F}. Now answer the following. (a) Compute (ABF)+. Show steps. (b) Find the canonical cover. Show steps. (c) Find all candidate keys. Show steps.
Consider the following relation R(A,B,C,D,E,G) and the set of functional dependencies F = { A →...
Consider the following relation R(A,B,C,D,E,G) and the set of functional dependencies F = { A → BCD BC → DE B → D D → A} Give a 3NF decomposition of the given schema based on a canonical cover
Consider the following transaction schedule: r1(X), r2(X), r3(X), r1(Y), w2(Z), r3(Y), w3(Z), w1(Y) This schedule is...
Consider the following transaction schedule: r1(X), r2(X), r3(X), r1(Y), w2(Z), r3(Y), w3(Z), w1(Y) This schedule is conflict-equivalent to some or all serial schedules. Determine which serial schedules it is conflict-equivalent to, and then identify a true statement from the list below. Select one: a. The schedule is conflict-equivalent to (T3, T1, T2) b. The schedule is not serial c. The schedule is conflict-equivalent to (T3, T2, T1) d. The schedule is conflict-equivalent to (T2, T3, T1) e. The schedule is...
Four transactions are presently running: (The abbreviation R(A) means Read(A), and so on) • T1: R(A),R(B),R(J),W(A),W(B),R(D),R(E),R(G)...
Four transactions are presently running: (The abbreviation R(A) means Read(A), and so on) • T1: R(A),R(B),R(J),W(A),W(B),R(D),R(E),R(G) • T2: R(C),R(G),W(C),R(H),W(H),R(D) • T3: W(J),R(C),W(C) • T4: R(G),W(D),R(J) The following is a schedule for these transactions. T1:R(A), T4:R(G), T3:W(J), T1:R(B), T1:R(J), T1:W(A), T3:R(C), T3:W(C), T2:R(C), T2:R(G), T1:W(B), T1:R(D), T2:W(C), T1:R(E), T1:R(G), T2:R(H), T2:W(H), T4:W(D), T4:R(J), T2:R(D) 1. List all conflicts in these transactions. 2. Is the schedule conflict serializable? If it is, to which serial schedule(s) is it equivalent?
Exercise 4 Determine whether or not the following Σ11 and Σ12 are equivalent. Show and explain...
Exercise 4 Determine whether or not the following Σ11 and Σ12 are equivalent. Show and explain your answer R1= {A, B, C}, Σ11 = {A->B, A->C, C->A} and Σ12 = {A->B, AB->C, A->C, C->A} on R1, respectively. Exercise 5 Decompose the following into BCNF R = (A, B, C) F = {A → B, B → C} Exercise 6 George withdraws $100 from his account (T1) while Mary deposits$500 into George’s account (T2) in the following transaction process. Draw up...
Given the following Schema S = (R, FD) where R = (A, B, C, D, E, F) and FD contains the following...
Given the following Schema S = (R, FD) where R = (A, B, C, D, E, F) and FD contains the following dependencies: A -> BC B ->C C -> D D ->E C -> E E -> F DE -> F C -> F 1. Find a minimal cover of F 2. Find a key for the schema 3. Find a 3N decomposition of the schema that satisfies the lossless join decomposition and dependency preservation properties 4. Find a...
Consider the following definition of equivalent sets of functional dependencies on a relation: “Two sets of...
Consider the following definition of equivalent sets of functional dependencies on a relation: “Two sets of functional dependencies F and F’ on a relation R are equivalent if all FD’s in F’ follow from the ones in F, and all the FD’s in F follow from the ones in F’.” Given a relation R(A, B, C) with the following sets of functional dependencies: F1 = {A B, B C}, F2 = {A B, A C}, and...
please do question 4.
Note that we follow the convention of denoting the set of attributes {A, B, C} by ABC when we write FDs but not when we write schemas. Given the following set set F of FDs on schema R= (A, B, C, D, E,G): A + BC AB + CD B +C E →D G +C EG → AD Answer the following questions. Questions 1-4 require a formal proof or disproof. A proof may be given either...
Language: SQL - Normalization and Functional
Dependencies
Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold over this relation. F=D → C, A B,A-C Question 4.1 (3 Points) Determine all candidate keys of R Question 4.2 (4 Points) Compute the attribute cover of X-(C, B) according to F Question 43 (5 Points) Compute the canonical cover of F.Show each step of the generation according to the algorithm shown in class....
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