1

### GATE CSE 2016 Set 2

B+ Trees are considered BALANCED because
A
the lengths of the paths from the root to all leaf nodes are all equal.
B
the lengths of the paths from the root to all leaf nodes differ from each other by at most 1.
C
the number of children of any two non-leaf sibling nodes differ by at most 1.
D
the number of records in any two leaf nodes differ by at most 1.
2

### GATE CSE 2016 Set 2

Suppose a database schedule $S$ involves transactions ${T_1},\,...,\,{T_n}.$ Construct the precedence graph of $S$ with vertices representing the transactions and edges representing the conflicts. If $S$ is serializable, which one of the following orderings of the vertices of the precedence graph is guaranteed to yield a serial schedule?
A
Topological order
B
Depth-first order
C
D
Ascending order of transaction indices
3

### GATE CSE 2016 Set 2

Consider the following database schedule with two transactions, T1 and T2
 S = r2(X); r1(X); r2(Y); w1(X); r1(Y); w2(X); a1; a2

where ri(Z) denotes a read operation by transaction Ti on a variable Z, wi(Z) denotes a write operation by Ti on a variable Z and ai denotes an abort by transaction Ti .

Which one of the following statements about the above schedule is TRUE?

A
S is non-recoverable
B
S is recoverable, but has a cascading abort
C
S does not have a cascading abort
D
S is strict
4
Numerical

### GATE CSE 2016 Set 2

Consider the following database table named $water$_$schemes :$

water_schemes
scheme_no district_name capacity
1 Ajmer 20
1 Bikaner 10
2 Bikaner 10
3 Bikaner 20
1 Churu 10
2 Churu 20
1 Dungargarh 10

The number of tuples returned by the following $SQL$ query is _______________.

with total(name, capacity) as
select district_name, sum(capacity)
from water_schemes
group by district_name
with total_avg(capacity) as
select avg(capacity)
from total
select name
from total, total_avg
where total.capacity ≥ total_avg.capacity

### Paper Analysis of GATE CSE 2016 Set 2

Subject NameTotal Questions
Algorithms5
Compiler Design3
Computer Networks6
Computer Organization6
Data Structures5
Database Management System4
Digital Logic3
Discrete Mathematics11
Operating Systems3
Theory of Computation6
General Aptitude10