About DSM, Which of the following sentences is true:
Anonymous Quiz
14%
Share physical memory
60%
Physical memory is distributed
9%
Sharing data in single computer
17%
All sentences are true
Subnoscription (filter) model in Publish-subscribe systems
Anonymous Quiz
5%
Channel-based approaches
5%
Topic-based approaches
6%
Content-based approaches
83%
All sentences are true
One-to-multiple Communication + Agreement:
Anonymous Quiz
21%
Multicast
6%
Broadcast
54%
Group communication
19%
Group communication and Multicast
Synchronizing Logical Clocks:
Anonymous Quiz
4%
Cristian’s algorithm
4%
Berkeley algorithm
79%
Lamport’s clocks
14%
All sentences are true.
Real networks are:
Anonymous Quiz
11%
Asynchronous
5%
Unreliable
72%
Asynchronous and Unreliable
13%
All sentences are false
About DS time, Which of the following sentences is false:
Anonymous Quiz
58%
Logical time is problematic in DS
13%
The notion of time is well-defined (and measurable) at each single location
12%
The relationship between times at different locations is unclear
17%
There is no absolute physical “global time” in DS
From problems of Locking in DS transactions:
Anonymous Quiz
69%
Livelocks
7%
Recoverability
9%
Dirty reads
15%
All sentences are true
In DS transactions which of this Operation do not cause Conflict:
Anonymous Quiz
78%
read/read
12%
read/write
3%
write/write
8%
All sentences are true
Atomic transaction means:
Anonymous Quiz
63%
All or nothing
5%
A transaction must be completes successfully
6%
Each transaction must be performed without interference from other transactions
26%
All sentences are true
👍1
ACID properties of atomic transactions:
Anonymous Quiz
10%
Atomicity
1%
Consistency
7%
Isolation and Durability
82%
All sentences are true
To request handling in Replication, use those orders:
Anonymous Quiz
8%
FIFO ordering
8%
Causal ordering
7%
Total ordering
77%
All sentences are true
Replication can provide the following:
Anonymous Quiz
5%
Performance enhancement
7%
Fault-tolerant service
7%
Availability
81%
All sentences are true
Information held by coordinators of nested transactions:
Anonymous Quiz
16%
A list of its subtransactions
14%
A subtransaction status_commit or aborts
60%
List of its subtransactions and subtransaction status
9%
Flat transaction
The TID of a subtransaction:
Anonymous Quiz
70%
An extension of its parent's TID
10%
The same TID of its parent's
10%
Subtransaction does not need TID
11%
Wholly different from the parents’ TID
In a distributed transaction, the Coordinator interface provides a new method, which is used whenever a new participant joins the transaction, this method is:
Anonymous Quiz
82%
Join operation
10%
Open operation
5%
Close operation
3%
Abort operation
A distributed transaction refers to:
Anonymous Quiz
5%
A flat transaction
8%
A nested transaction
73%
A flat or nested transaction
14%
All sentences are false
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