1) Explain two-phase locking.
2) Explain the meaning of the expression of ACID transaction.
1) Explain two-phase locking. 2) Explain the meaning of the expression of ACID transaction.
Transaction (Locking Protocols) Transaction 1 wants to: R1X) W10X) R1(Y) W1Y) W1X) Transaction 2 wants to: W2(Y) R2(Z) W2(Z) Assume these two transactions try to submit requests in this order: R1(X) W1(X) R1(Y) W1(Y) w2(Y) R2(Z) W2(Z) W1(x) Please show the real schedule when 1. the 2-phase locking is used 2. the strick 2-phase locking is used
1. What is the difference between Two-Phase Locking (2PL) and Strict Two-Phase Locking? What condition to Strict 2PL prevent that 2PL does not prevent? 2. What are deadlocks? What are two techniques for detecting and resolving deadlocks? 3. In the figure below, R(X, y) means read database item X into variable y and W(X, y) means write variable y into database item y. Column T1 shows transaction T1's operations and column T2 shows T2's operations. Columns Aand_B show the values...
About <Kuo-Automatic_Control_Systems> The Matlab Practical Homework : 1. Try the following expression and explain its meaning. >>num=[7 9 12]; >>den=conv(poly([O - 7]),[1 10 100]); >>[A,B,C]=residue(num,den) 2.What is the command to execute the in- put of polynomial P1 = (s+2) (s+5) 65+6)? 3.Find the root of equation 5s4 + 753 +9s2 -3s+2 = 0
This comes from a class on databases
(c) Transaction Processing Consider the following schedule: transaction TI Transaction T2 read(X) write(X) read(Y) write(Y) read write (Y) read (X) write read(W) write(W) read(Z) write(z) i. Is the schedule (conflict) serializable? If yes, give an equivalent serial schedule; if not, explain why not. ii. Add read-lock0, write-lock and unlock instructions to the schedule following the two-phase locking protocol. Is there deadlock present?
2) What is the meaning of the expression EF = 0? 3) What is the difference between speed, velocity, and instantaneous velocity, velocity and acceleration? Give examples of each. 4) What are scalars and vectors. Explain them with examples. h (United States 0 Focus MACBOOK
1. Explain the principle of risk-neutral valuation. 2.. Explain the meaning of mean reversion. All assignments must include at least one full page in APA format with at least two outside references.
1. Explain the difference between phase equilibrium and metastable phase. 2. Give three variables that determine the microstructure of an alloy. 3. Two nur
Q.1 Explain the meaning of the two additional terms in the van der Waals equation compared to the Ideal Gas equation. Explain how one of the terms is related to the Lennard-Jones potential.
Fluid Mechanics - Local, spatial, Material derivative state the
meaning of the expression for 1) state the most general form of the
local equation of conservation of mass, write the form of
incompressible flow for 2)
1. Fill in the missing letters in the expression that follows, where T represents temperature and subscripts M and S refer to material and spatial coordinates, respectivel;y State, in words, the meanng of this expression 2. State the most general form of the local...
Q4: Define transactions in DBMS. Briefly explain each of the ACID properties of a transaction