Multiple choice a) Which of the following about in-memory databases are true? If
ID: 3589532 • Letter: M
Question
Multiple choice
a) Which of the following about in-memory databases are true?
If the machine running the in-memory database restarts, all the data is lost
Fetching data from memory (RAM) is orders of magnitude faster than fetching data from the disk
In-memory databases need to have a predetermined schema
In-memory databases can never store data on the disk
b) Multiple choice
Which of the following statements about MongoDB are false? Mark all that apply.
All MongoDB documents should have the same set of fields
MongoDB is a wide column database
MongoDB supports JSON documents
Adding a field to a document will add that field to all documents
c)
Which of the following assumptions should not be made about a distributed system? Mark all that apply.
The network latency is always low and predictable
The set of computer working together (called group of nodes) can change over time
New nodes cannot join a distributed system
The nodes of a distributed system may fail at any time
If the machine running the in-memory database restarts, all the data is lost
Fetching data from memory (RAM) is orders of magnitude faster than fetching data from the disk
In-memory databases need to have a predetermined schema
In-memory databases can never store data on the disk
b) Multiple choice
Which of the following statements about MongoDB are false? Mark all that apply.
1All MongoDB documents should have the same set of fields
2MongoDB is a wide column database
3MongoDB supports JSON documents
4Adding a field to a document will add that field to all documents
c)
Which of the following assumptions should not be made about a distributed system? Mark all that apply.
The network latency is always low and predictable
The set of computer working together (called group of nodes) can change over time
New nodes cannot join a distributed system
The nodes of a distributed system may fail at any time
Explanation / Answer
a)
If the machine running the in-memory database restarts, all the data is lost
Fetching data from memory (RAM) is orders of magnitude faster than fetching data from the disk
b)
MongoDB is a wide column database
Adding a field to a document will add that field to all documents
c)
The network latency is always low and predictable
The nodes of a distributed system may fail at any time
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