Engineering, 05.05.2020 16:44 jboii11

Consider the log shown below.

LSN LOG

00 update: T1 writes P3

10 update: T1 writes P1

20 update: T1 writes P2

30 update: T2 writes P3

40 begin checkpoint

45 end checkpoint

50 update: T3 writes P4

60 T1 commit

70 update: T3 writes P2

80 T1 end

90 update: T2 writes P1

100 T2 commit CRASH, RESTART

In this log, we store information about 3 transactions. After the log record with LSN 100, the system crashes and then we restart. We use the ARIES recovery algorithm discussed in Chapter 18 in the book. Based on that, answer the following questions:

1. What is done during the Analysis phase?

2. What is done during the Redo phase?

3. What is done during the Undo phase?

4. Show the log when recovery is complete, including all non-null prevLSN and undonextLSN values in log records.

Answers: 3

Show answers

Another question on Engineering

Engineering, 03.07.2019 15:10

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Answers: 3

Answer

Engineering, 04.07.2019 18:10

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Answers: 1

Answer

Engineering, 04.07.2019 18:10

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

Answers: 3

Answer

You know the right answer?

Consider the log shown below.

LSN LOG

00 update: T1 writes P3

10...

Questions