A binary tree with depth d is complete if
A) each level L < d has 2L nodes
B) every node that is not a leaf has 2 children
C) every node that is not a leaf has 2 children and all nodes at level d are as far to the left as possible
D) each level L < d has 2L nodes and all nodes at level d are as far to the left as possible
D) each level L < d has 2L nodes and all nodes at level d are as far to the left as possible
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A nonadjacent range
A) is selected with the "Ctrl + Alt + Delete" key combination. B) contains two or more cells or ranges that are not touching each other. C) is the best tool to to use to decide which numbers to select. D) isn't possible in Excel 2010.
Suppose that transactions T1 and T2 can be decomposed into the subtransactions T1 : T1,1, T1,2 and T2 : T2,1, T2,2 such that the database items accessed by T1,1 and T2,1 are disjoint from the items accessed by T1,2 and T2,2. Instead of guaranteeing that all schedules involving T1 and T2 are serializable, suppose that a concurrency control guarantees that T1,1 is always executed serializably with T2,1 and that T1,2 is always executed serializably with T2,2.
a. Will T1 always be serializable with T2? Explain. b. What minimal additional condition on the subtransactions guarantees that the effect of executing T1 concurrently with T2 is the same as a serial schedule? c. Assuming that the condition of (b) holds, what advantage does the new concurrency control have over a concurrency control that guarantees serializability?