Consider the following schedule. Explain what happens when transactions try to execute as per this schedule and the DBMS uses timestamp-based concurrency control. We use ST to denote the start of a transaction, C for commit,
and A for abort.
ST1 → ST2 → ST3 → ST4 → R2(X) → R1(X) → W2(X) → W4(X) → W1(X) →
C1 → W3(X → A4 → R2(Y ) → W2(Y ) → R3(Y ) → C2 → W3(Y ) → C3
(Fill in the table below showing what happens as the transactions execute):
T1 T2 T3 T4 X Y
1 2 3 4 RT = 0 RT = 0
WT = 0 WT = 0
C = true C = true
R2(X)
Consider the following schedule. Explain what happens when transactions try to execute as per this schedule and the DBMS uses multiversion concurrency control:
ST1 → ST2 → ST3 → ST4 → R1(X) → R3(X) → W3(X) → R2(X) → R4(X) →
W2(X) → W4(X)
(Fill in the table below showing what happens as the transactions execute):
T1 T2 T3 T4 X0 . . .
1 2 3 4
R1(X) RT = 1

3. (6 pts) internally in the computer, with few exceptions, all numerical computation is done using binary numbers. output, however, often uses ascii, which is formed by appending 011 to the left of a bcd code. thus, an algorithm that directly converts a binary integer to a bcd integer is very useful. here is one such algorithm 1) draw lines to the left of the binary number to bound the expected bcd decades. (each decade is a group of 4 bits.) move the binary number one bit to the left. add 0011 to each bcd decade containing a binary value> 0100 repeat steps 2-3 until the last bit in the binary number has been moved into the least significant decade position. (note that when the last bit has been shifted into bcd decade, step 3 is not repeated.) read the bcd result. 2) 3) 4) 5) a) execute the algorithm for the binary number 1101101 b) execute the algorithm for the binary number 01110101110 4. (4 pts) represent the decimal number 3568 in bcd; excess-3 code; ascil; and hex.

1. declare a constant named cents_per_pound and initialize with 25. 2. get the shipping weight from user input storing the weight into shipweightpounds. 3. using flat_fee_cents and cents_per_pound constants, assign shipcostcents with the cost of shipping a package weighing shipweightpounds.

The graph shows median weekly earnings for full-time workers according to education level. which can you not conclude?