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ER‐model. Relational model:Relational algebra, Tuple calculus, SQL. Integrity constraints, Normal forms. File organization, Indexing (e.g., B and B+ trees). Transactions and concurrency control.

$$\small{\overset{{\large{\textbf{Mark Distribution in Previous GATE}}}}{\begin{array}{|c|c|c|c|c|c|c|c|}\hline
\textbf{Year}&\textbf{2019}&\textbf{2018}&\textbf{2017-1}&\textbf{2017-2}&\textbf{2016-1}&\textbf{2016-2}&\textbf{Minimum}&\textbf{Average}&\textbf{Maximum}
\\\hline\textbf{1 Mark Count}&2&2&2&2&3&2&2&2.2&3
\\\hline\textbf{2 Marks Count}&3&2&3&3&1&2&1&2.3&3
\\\hline\textbf{Total Marks}&8&6&8&8&5&6&\bf{6}&\bf{6.8}&\bf{8}\\\hline
\end{array}}}$$

Recent questions in Databases

2 votes
5 answers
1
1 vote
2 answers
2
0 votes
3 answers
3
A primary key, if combined with a foreign key creates parent child relationship between the tables that connect them many-to-many relationship between the tables that connect them network model between the tables that connect them none of these
asked Apr 2 in Databases Lakshman Patel RJIT 336 views
0 votes
2 answers
4
0 votes
1 answer
5
Consider the schema $R=(\text{S T U V})$ and the dependencies $ S \rightarrow T, T \rightarrow U, U \rightarrow V$, and $V \rightarrow S.$ If $R=(R1 \text{ and } R2)$ be a decomposition such that $R1 \cap R2= \phi$ then decomposition is not in $\text{2 NF}$ in $\text{2 NF}$ but not in $\text{3 NF}$ in $\text{3 NF}$ but not in $\text{2 NF}$ in both $\text{2 NF}$ and $\text{3 NF}$
asked Apr 2 in Databases Lakshman Patel RJIT 153 views
1 vote
2 answers
6
Assume transaction $A$ holds a shared lock $R.$ If transaction $B$ also requests for a shared lock on $R.$ It will result in deadlock situation immediately be granted immediately be rejected be granted as soon as it is released by $A$
asked Apr 1 in Databases Lakshman Patel RJIT 244 views
0 votes
1 answer
7
Given relations $R(w,x)$ and $S(y,z),$ the result of SELECT DISTINCT $w,x$ from $R,S$ $R$ has no duplicates and $S$ is non-empty $R$ and $S$ have no duplicates $S$ has no duplicates and $R$ is non-empty $R$ and $S$ has the same number of tuples
asked Apr 1 in Databases Lakshman Patel RJIT 182 views
1 vote
2 answers
8
For a database relation $R(a,b,c,d)$ where the domains of $a,b,c$ and $d$ include only atomic values, only the following functional dependencies and those that can be inferred from them hold. $a \rightarrow c$ $b \rightarrow d$ The relation is in First normal form but not in second normal form Second normal form but not in third normal form Third normal form None of the above
asked Apr 1 in Databases Lakshman Patel RJIT 181 views
2 votes
1 answer
9
0 votes
1 answer
10
When transaction $Ti$ requests a data item currently held by $Tj,Ti$ is allowed to wait only if it has a time stamp smaller than that of $Tj$ (that is $Ti$ is order than Tj). Otherwise, $Ti$ is rolled back (dies). This is Wait-die Wait-wound Wound-wait Wait
asked Apr 1 in Databases Lakshman Patel RJIT 175 views
0 votes
2 answers
11
When transaction $Ti$ requests a data item currently held by $Tj,Ti$ is allowed to wait only if it has a timestamp smaller than that of $Tj$ (that is $Ti$ is order than Tj). Otherwise, $Ti$ is rolled back (dies). This is Wait-die Wait-wound Wound-wait Wait
asked Apr 1 in Databases Lakshman Patel RJIT 176 views
0 votes
1 answer
12
Given relations $R(w,x)$ and $S(y,z),$ the result of SELECT DISTINCT $w,x$ from $R,S$ $R$ has no duplicates and $S$ is non-empty $R$ and $S$ have no duplicates $S$ has no duplicates and $R$ is non-empty $R$ and $S$ has the same number of tuples
asked Apr 1 in Databases Lakshman Patel RJIT 145 views
0 votes
1 answer
13
0 votes
1 answer
15
Assume transaction $A$ holds a shared lock $R.$ If transaction $B$ also requests for a shared lock on $R.$ It will result in deadlock situation immediately be granted immediately be rejected be granted as soon as it is released by $A$
asked Apr 1 in Databases Lakshman Patel RJIT 146 views
0 votes
1 answer
16
Table employees has $10$ records. It has a non-NULL SALARY column which is also UNIQUE. The SQL statement SELECT COUNT(*) FROM EMPLOYEE WHERE SALARY > ALL (SELECT SALARY FROM EMPLOYEE); $10$ $9$ $5$ $0$
asked Apr 1 in Databases Lakshman Patel RJIT 198 views
1 vote
1 answer
17
0 votes
1 answer
18
1 vote
1 answer
20
The employee salary should not be greater than Rs.$2000$. This is integrity constraint referential constraint over-defined constraint feasible constraint
asked Mar 31 in Databases Lakshman Patel RJIT 413 views
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