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Recent questions tagged databases
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1
File organisation and indexing (DBMS)
Suryadip
asked
in
Databases
Mar 10
by
Suryadip
47
views
databases
indexing
file-system
0
votes
0
answers
2
#dbms
Çșȇ ʛấẗẻ
asked
in
Databases
Feb 24
by
Çșȇ ʛấẗẻ
58
views
databases
database-normalization
0
votes
0
answers
3
NPTEL DBMS (Introduction to Database systems)course Assignment 10: Topic Database Indexing
Use the following information to answer Questions 7 and 8. A sorted file has the following details: Number of records = 13,10,720; record length = 200 bytes; size of the primary key field = 13 bytes; size of ... of blocks in the first level index file is: a)131072 b)1311 c)1310 d)1286 Accepted Answers: 1286
RishabhSahu325
asked
in
Databases
Feb 23
by
RishabhSahu325
88
views
databases
0
votes
2
answers
4
GATE DS&AI 2024 | Question: 21
Consider the following two tables named Raider and Team in a relational database maintained by a Kabaddi league. The attribute ID in table Team references the primary key of the Raider table, ID. \begin{tabular}{|l|l|l|l|} \hline \multicolumn{4 ... WHERE Raider.ID=Team.ID AND City="Jaipur" AND RaidPoints > 200; The number of rows returned by this query is
Arjun
asked
in
Databases
Feb 17
by
Arjun
761
views
gate-ds-ai-2024
numerical-answers
databases
sql
0
votes
1
answer
5
GATE DS&AI 2024 | Question: 36
Given the relational schema $R=(U, V, W, X, Y, Z)$ and the set of functional dependencies: \[ \{U \rightarrow V, U \rightarrow W, W X \rightarrow Y, W X \rightarrow Z, V \rightarrow X\} \] Which of the following functional dependencies can be derived ... derived from the above set? $V W \rightarrow Y Z$ $W X \rightarrow Y Z$ $V W \rightarrow U$ $V W \rightarrow Y$
Arjun
asked
in
Databases
Feb 17
by
Arjun
743
views
gate-ds-ai-2024
databases
database-normalization
multiple-selects
1
vote
2
answers
6
GATE CSE 2024 | Set 2 | Question: 9
Once the $\text{DBMS}$ informs the user that a transaction has been successfully completed, its effect should persist even if the system crashes before all its changes are reflected on disk. This property is called durability atomicity consistency isolation
Arjun
asked
in
Databases
Feb 16
by
Arjun
1.9k
views
gatecse2024-set2
databases
transaction-and-concurrency
1
vote
1
answer
7
GATE CSE 2024 | Set 2 | Question: 10
In the context of owner and weak entity sets in the $\text{ER}$ (Entity-Relationship) data model, which one of the following statements is TRUE? The weak entity set MUST have total participation in the identifying ... in the identifying relationship Neither weak entity set nor owner entity set MUST have total participation in the identifying relationship
Arjun
asked
in
Databases
Feb 16
by
Arjun
1.6k
views
gatecse2024-set2
databases
2
votes
2
answers
8
GATE CSE 2024 | Set 2 | Question: 16
Which of the following file organizations is/are $\text{I/O}$ efficient for the scan operation in $\text{DBMS}$? Sorted Heap Unclustered tree index Unclustered hash index
Arjun
asked
in
Databases
Feb 16
by
Arjun
2.1k
views
gatecse2024-set2
databases
multiple-selects
1
vote
1
answer
9
GATE CSE 2024 | Set 2 | Question: 17
Which of the following statements about the Two Phase Locking ($2 \mathrm{PL}$) protocol is/are TRUE? $2 \mathrm{PL}$ permits only serializable schedules With $2 \mathrm{PL}$, a transaction always locks the data item being read or ... , no more locks on any data item can be obtained inside that transaction A deadlock is possible with $2 \mathrm{PL}$
Arjun
asked
in
Databases
Feb 16
by
Arjun
1.7k
views
gatecse2024-set2
databases
two-phase-locking-protocol
multiple-selects
2
votes
1
answer
10
GATE CSE 2024 | Set 2 | Question: 35
The relation schema, Person (pid, city), describes the city of residence for every person uniquely identified by pid. The following relational algebra operators are available: selection, projection, cross product, and rename. To find the list of cities ... above operators, the minimum number of cross product operations that must be used is $1$ $2$ $3$ $4$
Arjun
asked
in
Databases
Feb 16
by
Arjun
1.8k
views
gatecse2024-set2
databases
1
vote
1
answer
11
GATE CSE 2024 | Set 2 | Question: 46
A functional dependency $F: X \rightarrow Y$ is termed as a useful functional dependency if and only if it satisfies all the following three conditions: $\text{X}$ is not the empty set. $\text{Y}$ is not the empty set. Intersection ... set. For a relation $\text{R}$ with $4$ attributes, the total number of possible useful functional dependencies is __________.
Arjun
asked
in
Databases
Feb 16
by
Arjun
1.5k
views
gatecse2024-set2
numerical-answers
databases
1
vote
2
answers
12
GATE CSE 2024 | Set 1 | Question: 10
Let $\mathrm{S}$ be the specification: "Instructors teach courses. Students register for courses. Courses are allocated classrooms. Instructors guide students." Which one of the following $\mathrm{ER}$ diagrams CORRECTLY represents $\mathrm{S}$? $\text{(i)}$ $\text{(ii)}$ $\text{(iii)}$ $\text{(iv)}$
Arjun
asked
in
Databases
Feb 16
by
Arjun
1.8k
views
gatecse2024-set1
databases
er-diagram
2
votes
3
answers
13
GATE CSE 2024 | Set 1 | Question: 11
In a $\mathrm{B}+$ tree, the requirement of at least half-full $(50 \%)$ node occupancy is relaxed for which one of the following cases? Only the root node All leaf nodes All internal nodes Only the leftmost leaf node
Arjun
asked
in
Databases
Feb 16
by
Arjun
2.0k
views
gatecse2024-set1
databases
3
votes
2
answers
14
GATE CSE 2024 | Set 1 | Question: 12
Which of the following statements about a relation $\mathbf{R}$ in first normal form $\text{(1NF)}$ is/are TRUE? $\mathbf{R}$ can have a multi-attribute key $\mathbf{R}$ cannot have a foreign key $\mathbf{R}$ cannot have a composite attribute $\mathbf{R}$ cannot have more than one candidate key
Arjun
asked
in
Databases
Feb 16
by
Arjun
3.2k
views
gatecse2024-set1
multiple-selects
databases
1
vote
1
answer
15
GATE CSE 2024 | Set 1 | Question: 25
Consider the following two relations, $R(A, B)$ and $S(A, C)$: $R$ $A$ $B$ $10$ $20$ $20$ $30$ $30$ $40$ $30$ $50$ $50$ $95$ $S$ $A$ $C$ $10$ $90$ $30$ $45$ $40$ $80$ The total number of tuples obtained by evaluating the following expression $\sigma_{B<C}\left(R \bowtie_{R . A=S . A} S\right)$ is ___________.
Arjun
asked
in
Databases
Feb 16
by
Arjun
1.6k
views
gatecse2024-set1
numerical-answers
databases
0
votes
3
answers
16
GATE CSE 2024 | Set 1 | Question: 34
The symbol $\rightarrow$ indicates functional dependency in the context of a relational database. Which of the following options is/are TRUE? $(X, Y) \rightarrow(Z, W)$ implies $X \rightarrow(Z, W)$ $(X, Y) \rightarrow(Z, W)$ ... $(X, W) \rightarrow Z$ $(X \rightarrow Y$ and $Y \rightarrow Z)$ implies $X \rightarrow Z$
Arjun
asked
in
Databases
Feb 16
by
Arjun
1.9k
views
gatecse2024-set1
multiple-selects
databases
1
vote
1
answer
17
GATE CSE 2024 | Set 1 | Question: 36
Consider the following read-write schedule $\text{S}$ over three transactions $T_{1}, T_{2}$, and $T_{3}$ ... to $\text{S}$? $T_{1} T_{2} T_{3}$ $T_{1} T_{3} T_{2}$ $T_{3} T_{2} T_{1}$ $T_{3} T_{1} T_{2}$
Arjun
asked
in
Databases
Feb 16
by
Arjun
2.1k
views
gatecse2024-set1
databases
conflict-serializable
multiple-selects
4
votes
1
answer
18
GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 13
Division operator in relational algebra is appropriate to handle which of the following query types? employees work on at most one of the critical projects employees work on any one of the critical projects employees work on at least one of the critical projects employees work on all the critical projects
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
314
views
goclasses2024-mockgate-14
databases
relational-algebra
1-mark
6
votes
3
answers
19
GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 14
A B-Tree of order $m$ is an $m$-way search tree. What is the minimum number of keys that can be stored on the leaf level of a B-Tree of order 20 with 3 levels? (Note: the root of a tree counts as its first level)
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
593
views
goclasses2024-mockgate-14
numerical-answers
databases
b-tree
1-mark
4
votes
0
answers
20
GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 40
Consider the following schema (primary keys are underlined): Which of the following queries returns the department numbers of those departments for which there are no courses being offered?
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
265
views
goclasses2024-mockgate-14
databases
sql
2-marks
9
votes
1
answer
21
GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 41
Consider the following lock requests in the Table below. And note that: $\mathrm{S}(\cdot)$ and $\mathrm{X}(\cdot)$ stand for 'shared lock' and 'exclusive lock', respectively. $T_1, T_2, T_3, T_4$, and $T_5$ represent five transactions. $L M$ ... ), or already dead('-'). Select all that are correct. At t3: a At t6: b At t7: a At t8: -
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
603
views
goclasses2024-mockgate-14
databases
transaction-and-concurrency
two-phase-locking-protocol
multiple-selects
2-marks
6
votes
1
answer
22
GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 50
Consider the following database relation: $\mathrm{R}=(\mathrm{SFLNGCRW} \mathrm{H})=(\mathrm{S}$ : SID, F: First Name, L: Last Name, N: Number of Units, G: GPA, C: Course (of teaching), R ... only one applied? SID determines Rating Rating determines Wage Rating determines Course Rating and First Name determine Wage and Hours of Work
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
270
views
goclasses2024-mockgate-14
databases
database-normalization
functional-dependency
multiple-selects
2-marks
0
votes
1
answer
23
Memory Based GATE DA 2024 | Question: 16
Consider a relation R: \[ \begin{aligned} & R(U, V, W, X, Y, Z) \\ & F=\left\{ \begin{array}{l} U \rightarrow V \\ U \rightarrow W \\ WX \rightarrow Y \\ WX \rightarrow Z \\ V \rightarrow X \end ... be deduced. Which of the following options is correct? $VW \rightarrow U$ $VW \rightarrow Y$ $VW \rightarrow YZ$ $WX \rightarrow YZ$
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
157
views
gate2024-da-memory-based
goclasses
databases
database-normalization
functional-dependency
0
votes
0
answers
24
Memory Based GATE DA 2024 | Question: 17
Consider the following SQL query: \[ \begin{aligned} &\text{SELECT * FROM Raider, Team} \\ &\text{WHERE Raider.id = Team.id} \\ &\text{AND City = 'Jaipur'} \\ &\text{AND Raid_points \textgreater 200;} \end{aligned} \] Determine the number of rows returned by the SQL query, given the conditions specified for the City and Raid points.
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
139
views
gate2024-da-memory-based
goclasses
databases
sql
numerical-answers
0
votes
0
answers
25
Memory Based GATE DA 2024 | Question: 47
You are given three tables: `team`, `table1`, and `table2`. To find the names of all players in the team who are either present in `table1` or `table2`, consider the following relational algebra queries: \(\Pi_{\text{{PlayerName}}}(\text{{team}}) \,/\, \ ... text{{Name}}}(\text{{table1}} \cap \text{{table2}}) \,/\, \Pi_{\text{{PlayerName}}}(\text{{team}})\)
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
96
views
gate2024-da-memory-based
goclasses
databases
relational-algebra
0
votes
0
answers
26
Memory Based GATE DA 2024 | Question: 58
DBMS question: One SQL query is given. Based on the query which data structure can be used involving hashing, B+ tree, etc?
GO Classes
asked
in
Databases
Feb 5
by
GO Classes
104
views
gate2024-da-memory-based
goclasses
databases
sql
b-tree
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