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Recent questions tagged databases
0
votes
1
answer
151
Confused about cardinality of ER diagram which one is whose cardinality ,look on my notes and clear it out.
Pradeep_Kumar
asked
in
Databases
Jul 13, 2023
by
Pradeep_Kumar
475
views
databases
er-diagram
0
votes
0
answers
152
https://testbook.com/TS-nic-scientist-b/tests/640217b028c19ad10b7fed68?attemptNo=1#/lt-solutions
In a databse system, let TS(T1) and TS(T2) be the timestamps of transactions T1 and T2 respectively. W-t(X) denotes the largest timestamp of any transaction that executed write(X) successfully and R-t(X) denotes the ... TS(T₁) < W-t(X) then T₁ is rolled back All of the above. PS: Ans given as B
_Shubham_.Singh_
asked
in
Databases
Jul 10, 2023
by
_Shubham_.Singh_
242
views
transaction-and-concurrency
databases
testbook-test-series
0
votes
1
answer
153
2NF DECOMPOSITION
ROMITDUTTA
asked
in
Databases
Jul 5, 2023
by
ROMITDUTTA
224
views
databases
database-normalization
decomposition
normal-forms
0
votes
1
answer
154
Database
Considering the following schema, create the appropriate tables and insert at least 5 records: AUTHOR(author-id,name, city,country) PUBLISHER (publisher-id, name,city, country) CATALOG (book-id, title, author-id, publisher-id, category-id, year, price) CATEGORY ( ... in the catalog. (g) Obtain the author and publisher who have published books in more than or 14 equal to 2 categories.
gateexplore
asked
in
Databases
Jun 30, 2023
by
gateexplore
902
views
sql
relational-algebra
databases
self-doubt
0
votes
1
answer
155
data base
Construct the B+ tree for the following set of key values : {2,3,5,7,11,17,19,23,29,31}. Assume that tree is initially empty and values are added in ascending order. Construct B+ tree for the cases where the number of pointers that will fit in one node is as follows: (a) Four (b) Six (c) Eight
gateexplore
asked
in
Databases
Jun 30, 2023
by
gateexplore
570
views
databases
indexing
bplustrees
self-doubt
0
votes
0
answers
156
#cpcb
Two relations A and B are stored as clustered sequential files on disk. Each block on disk can hold 100 records of either A or B. The relation A contains 1000 records and B contains 500 records. There is a memory buffer to hold only 1 block of each relation. The number of block transfers required to complete a nested loop join operation on these two tables is at least (in integer) _________.
amit166
asked
in
Databases
Jun 30, 2023
by
amit166
226
views
databases
0
votes
0
answers
157
Databases
Show that the two phase locking protocol ensures conflict serializability and that transaction can be serialized according to their lock points.
gateexplore
asked
in
Databases
Jun 30, 2023
by
gateexplore
203
views
databases
two-phase-locking-protocol
serializability
1
vote
2
answers
158
Go class
A database relation has10 attributes {A,BCD,E,F,J} “CDEF” is known to be a candidate key of relation . There may be other candidate keys, which are unknown. What is the maximum number of candidate keys that could simultaneously have?
ayushjain321
asked
in
Set Theory & Algebra
Jun 29, 2023
by
ayushjain321
732
views
databases
1
vote
1
answer
159
Ace Test Series | DBMS
In multiple Granularity locking protocol at a particular node transaction T1 is holding SIX LOCK. When transaction T2 is also requesting a lock, at that node which other lock is allowed. I S I X S SIX X
none30
asked
in
Databases
Jun 16, 2023
by
none30
339
views
ace-test-series
databases
0
votes
1
answer
160
Ace Test Series | DBMS
A schedule S is having 3 transactions and each transaction is having two different data items and a blind 'Write A' statement is in all the three transactions.With the above information can you say whether the schedule is ... how many equivalent serial schedules are there serializable and it is equivalent to only two serial schedule detailed schedule is needed
none30
asked
in
Databases
Jun 16, 2023
by
none30
318
views
ace-test-series
databases
serializability
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