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Questions by yg92
3
votes
2
answers
21
SQL <=ALL Query
select studentid, studentname from student where birthyear <=ALL( select birthyear from student); Returns detail of the youngest student Returns detail of oldest student Should not the answer be 2) ?
asked
in
Databases
Dec 31, 2016
608
views
sql
databases
6
votes
2
answers
22
Fragmentation Ipv4-Ipv6
True or false - 1. In Ipv4 fragmentation can be done both at Source and intermediate routers. 2. In Ipv6 fragmentation can be done only at Source and not intermediate routers. 3. In both IPv6/4 reassembly is done only at the destination. 4. ... fragmentation done at the Source in Ipv4? Should the 1) be false since segmentation is done and hence fragmentation can be avoided?
asked
in
Computer Networks
Dec 30, 2016
2.8k
views
computer-networks
fragmentation
network-layering
ip-addressing
ipv6
3
votes
1
answer
23
DFS using Stack
Could someone please explain Depth first Search using Stack? I have found different algorithms for handling the visited flag and the way the nodes are pushed. I am having problems in solving these types of questions - Find the nodes or number of nodes that are pushed onto stack more than once? Could someone please help with a small example?
asked
in
DS
Dec 30, 2016
2.7k
views
data-structures
stack
descriptive
2
votes
1
answer
24
Number of Solutions for the quation
How many integral solutions exist for the system of equations x+y+z =15 where 0<=x,y,z<=10 ? Ans given is 620. I am getting 91 Could someone point out the flaw in the below logic? Mehod Used : There are 10 stars and 3 bins with multi choose 17C2 = 136 Invalid Solutions (Any of them assigned >=11 ) 3C1 * N( x+y+z = 4) => 3*6C2 = 15 *3 =45 136-45=91
asked
in
Combinatory
Dec 29, 2016
334
views
combinatory
discrete-mathematics
2
votes
0
answers
25
Determining Strict 2PL
Which of the following schedules are allowed by strict 2pl with shared and xclusive locks - r1(A); r2(B); r3(C); w1(B); c1; w2(C); c2; w3(D); c3 r1(A); r2(B); r3(C); r1(B); r2(C); r3(D); c3; ... and strict recoverability and both must be satisfied. In the above 1) and 2) satisfy conflict serializablility and strict recoverability. Then which is the correct solution?
asked
in
Databases
Dec 26, 2016
756
views
transaction-and-concurrency
databases
1
vote
1
answer
26
Computing Effective Memory access time - Cache organization
Consider the following information about a hypothetical processor. Assume the cache is physically addressed TLBHit Rate: 95% access time 1 cycle Cache Hit Rate: 90% access time 1 cycle when tlb and cache both get miss, page fault rate 1% TLB access and ... 1 + .1(5+ .01(100) ) = 2.675 Could someone pls point out the flaw in the logic?
asked
in
CO and Architecture
Dec 26, 2016
1.3k
views
co-and-architecture
cache-memory
translation-lookaside-buffer
5
votes
2
answers
27
Working of ANY and ALL with empty set
create table stud(id int, grade varchar(20)); insert into stud values(1, 'A'); insert into stud values(2, 'A'); insert into stud values(3, 'B'); insert into stud values(4, 'B'); // Working of ALL ... rerturns NOTHING and NOT a null. Is that an empty set? How is ANY and ALL deciding their output with respect to empty set?
asked
in
Databases
Dec 21, 2016
2.0k
views
databases
sql
0
votes
0
answers
28
Disk Transfer Time Calculation
Could some one please guide what should be the conversion units when calcuating Disk Transfer time and Transmission time? For disk transfer time I have noticed that in many solutions powers of 10 and 2 are interchangeably used based on ... type( floppy, hard disk etc) https://en.wikipedia.org/wiki/Binary_prefix https://en.wikipedia.org/wiki/Data_rate_units
asked
in
CO and Architecture
Dec 9, 2016
655
views
co-and-architecture
computer-networks
disk
5
votes
2
answers
29
Identifying Context Free Language
$L1= \{a^mb^nc^k\;|\;if\,(m=n)\,then\,(n!=k)\} \\ L2= \{a^ib^jc^k\;|\;if\,(i<j)\,then\,(k<j)\}\\ L3= \{a^ib^jc^k\;|\;(i<j)\,\leftrightarrow \,(k<j)\}$ Could someone please help to conclude the class of above languages? Below mentioned is the ... ( k<j) ] or [ (i<j) and (k<j) ] = [ (i>=j) and (k>=j) ] or [ ( i<j) and ( k<j) ] = CSL
asked
in
Theory of Computation
Nov 17, 2016
1.2k
views
identify-class-language
context-free-language
theory-of-computation
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