Top 50 Memcached Multiple Choice Questions (MCQs) with Answers

1 .

The first version of Memcached is launched on_______.

A)

May, 22, 2000

B)

May, 22, 2002

C)

May, 22, 2003

D)

May, 22, 2004

Correct Answer : May, 22, 2003

Explanation : Memcached was first developed by Brad Fitzpatrick for his website LiveJournal, on May 22, 2003. It was originally written in Perl, then later rewritten in C by Anatoly Vorobey, then employed by LiveJournal.

2 .

Memcached is written in which of the following language?

A)

C

B)

C++

C)

Java

D)

Ruby

Correct Answer : C

Explanation : Memcached is written in C language.

3 .

Who first developed Memcached?

A)

Eric Schmidt

B)

Alan Mulally

C)

Sergey Brin

D)

Brad Fitzpatrick

Correct Answer : Brad Fitzpatrick

Explanation : Memcached was first developed by Brad Fitzpatrick for his website LiveJournal, on May 22, 2003

4 .

Memcached is a _______.

A)

Centralized memory object caching system

B)

Distributed memory object caching system

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Distributed memory object caching system

Explanation : Memcached is a Distributed memory object caching system.

5 .

Is Memcached Open-source?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

Explanation : Memcached is open-source.

6 .

What is the Memcached default port?

A)

11311

B)

11220

C)

11211

D)

11451

Correct Answer : 11211

Explanation : Memcached default port is 11211.

7 .

What is the Memcached telnet command's basic syntax?

A)

$ HOST PORT

B)

$telnet HOST

C)

$telnet PORT_NAME

D)

$telnet HOST PORT

Correct Answer : $telnet HOST PORT

Explanation : The Memcached telnet command's basic syntax is: $telnet HOST PORT.

8 .

What are the alternatives to Memcached?

A)

Redis

B)

Couchbase

C)

Apache Ignite

D)

All of the above

Correct Answer : All of the above

Explanation : Following are the alternatives of Memcached:

* Redis
* Couchbase
* Apache Ignite
* Varnish

9 .

Which of the following companies are using Memcached?

A)

Twitter

B)

Facebook

C)

WordPress

D)

All of the above

Correct Answer : All of the above

Explanation : Following companies are using Memcached :

* Twitter
* Facebook
* WordPress
* Airbnb

10 .

Which of the following command provides you with the version of Memcached?

A)

Ver

B)

version

C)

â€“version

D)

Versionâ€”

Correct Answer : version

Explanation : The version command provides you with the version of Memcached.

11 .

The ____ command in Memcached is used to assign a new value to a new or existing key.

A)

Set

B)

Fix

C)

Setup

D)

Change

Correct Answer : Set

Explanation : The set command in Memcached is used to assign a new value to a new or existing key.

12 .

The ____ command in Memcached is used to assign a value to a new key.

A)

Set

B)

Add

C)

Assign

D)

Create

Correct Answer : Add

Explanation : The add command in Memcached is used to assign a value to a new key.

13 .

What will happen if you use add command to assign a value to a new key, and the key already exists?

A)

the output is STORED.

B)

the output is DUPLICATED

C)

the output is NOT STORED.

D)

None of the above

Correct Answer : the output is NOT STORED.

Explanation : The add command in Memcached is used to assign a value to a new key. If the key already exists, the output is NOT STORED.

14 .

How many methods are there to update the Memcached when data changes?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 2

Explanation : There are two methods to update Memcached when data changes :

* By clearing the cache proactively
* By resetting the cache

15 .

_______ is the method of distributing a big data set over numerous Memcached servers in a cluster.

A)

Segmentation

B)

Dogpile effect

C)

Fragmentation

D)

Sharding

Correct Answer : Sharding

Explanation : Sharding is the method of distributing a big data set over numerous Memcached servers in a cluster.

16 .

What is the maximum TTL?

A)

24 hours

B)

30 days

C)

60 days

D)

90 days

Correct Answer : 30 days

Explanation : The maximum TTL is 30 days.

17 .

What is the maximum size of a value that can be stored in Memcached?

A)

1MB

B)

2MB

C)

10MB

D)

No limit

Correct Answer : 1MB

Explanation : The maximum size of a value that can be stored in Memcached is 1 megabyte (MB).

18 .

The maximum length of a key in Memcached is ____.

A)

160 characters

B)

200 characters

C)

250 characters

D)

500 characters

Correct Answer : 250 characters

Explanation : The maximum length of a key in Memcached is 250 characters.

19 .

In the below syntax of add command, which of the following keyword in a syntax represent the data that needs to be stored?

add key flags exptime bytes [noreply]â€‹

A)

Key

B)

Flags

C)

Exptime

D)

Value

Correct Answer : Value

Explaination : Value represents the data that needs to be stored.

20 .

The ____ command in Memcached is used to replace the value of an existing key.

A)

Swap

B)

Change

C)

Replace

D)

Substitute

Correct Answer : Replace

Explanation : The replace command in Memcached is used to replace the value of an existing key.

21 .

If you are using replace command in Memcached and the key does not exist, what will happen?

A)

the output is STORED.

B)

the output is DUPLICATED

C)

the output is NOT STORED.

D)

All of the above

Correct Answer : the output is NOT STORED.

Explanation : The replace command in Memcached is used to replace the value of an existing key. If the key does not exist, the output is NOT STORED.

22 .

The ____ command in Memcached is used to add data to an existing key.

A)

Add

B)

Extend

C)

Prepend

D)

Append

Correct Answer : Append

Explanation : The append command in Memcached is used to add data to an existing key.

23 .

Does Memcached support the replication of data?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

Explanation : Yes, Memcached allows replication, which means that data may be replicated across numerous servers in a cluster.

24 .

Is Memcached fault-tolerant?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : No

Explanation : Memcached is not a fault-tolerant tool.

25 .

In Memcached UDP server is ____ by default.

A)

Enabled

B)

Disabled

C)

Can Not Say

D)

None of the above

Correct Answer : Disabled

Explanation : In Memcached, the UDP server is Disabled by default.

26 .

Which of the following correctly states the meaning of eviction in Memcached?

A)

extstore can't keep up

B)

you're writing too quickly

C)

you've run out of Memory

D)

All of the above

Correct Answer : All of the above

Explanation : Evictions can indicate that you've run out of Memory or that you're writing too quickly and extstore can't keep up.

27 .

The maximum number of concurrent connections is set to ____ by default.

A)

1024

B)

1050

C)

2000

D)

8000

Correct Answer : 1024

Explanation : The maximum number of concurrent connections is set to 1024 by default.

28 .

The ____ command deletes all data (key-value pairs) from the Memcached server.

A)

Drop_all

B)

Delete_all

C)

Flush_all

D)

Remove_all

Correct Answer : Flush_all

Explanation : The flush_all Memcached command deletes all data (key-value pairs) from the Memcached server.

29 .

When using the append command the data is stored ____ the existing data.

A)

After

B)

Before

C)

Middle

D)

None of the above

Correct Answer : After

Explanation : The append command in Memcached is used to add data to an existing key. The data is stored after the key's existing data.

30 .

The ____ command is used to append data to the beginning of an existing Memcached value for a specific key.

A)

Add

B)

Extend

C)

Append

D)

Prepend

Correct Answer : Prepend

Explanation : The prepend command is used to append data to the beginning of an existing Memcached value for a specific key.

31 .

If the key does not exist while appending the data using prepend command then what will be the result?

A)

The prepend command will fail if the key does not exist.

B)

The prepend command will append at the end of the key if the key does not exist.

C)

The prepend command will append in the middle of any key if the key does not exist.

D)

None of the above

Correct Answer : The prepend command will fail if the key does not exist.

Explanation : The prepend command will fail if the key does not exist.

32 .

What is CAS in Memcached?

A)

Check-And-Set

B)

Compare-And-Swap

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Both (A) and (B)

Explanation : CAS stands for Check-And-Set or Compare-And-Swap.

33 .

Which of the following command is used to set the data, if the data hasn't been updated since the last retrieve?

A)

Set

B)

CAS

C)

Recover

D)

Retrieve

Correct Answer : CAS

Explanation : If the data hasn't been updated since the last retrieve, the Memcached CAS command is used to set it.

34 .

___ refers to the length of time a value is held in Memcached before being evicted.

A)

TTL

B)

LRU

C)

Slab allocator

D)

None of the above

Correct Answer : TTL

Explanation : TTL refers to the length of time a value is held in Memcached before being evicted.

35 .

What is TTL?

A)

Time to load

B)

Total time left

C)

Total time live

D)

Time to live

Correct Answer : Time to live

Explanation : TTL stands for time to live.

36 .

Memcached use ____ to free up memory when it becomes full?

A)

TTL

B)

LRU

C)

Slab allocator

D)

None of the above

Correct Answer : LRU

Explanation : Memcached use LRU to free up memory when it becomes full.

37 .

Which command is used to retrieve the value stored at the key?

A)

Get

B)

Obtain

C)

Retrieve

D)

None of the above

Correct Answer : Get

Explanation : The Memcached get command is used to retrieve the value stored at the key.

38 .

Which command is used to remove an existing key from the Memcached server?

A)

Drop

B)

Erase

C)

Delete

D)

Remove

Correct Answer : Delete

Explanation : The Memcached delete command is used to remove an existing key from the Memcached server.

39 .

Which of the following command in Memcached is used to increase the numeric value of an existing key?

A)

Incr

B)

Raise

C)

Increase

D)

Increment

Correct Answer : Incr

Explanation : Incr command in Memcached is used to increase the numeric value of an existing key.

40 .

Which of the following command in Memcached is used to decrease the numeric value of an existing key?

A)

Decr

B)

lower

C)

decrease

D)

Decrement

Correct Answer : Decr

Explanation : Decr command in Memcached is used to decrease the numeric value of an existing key.

41 .

What is LRU?

A)

Late reset utilized

B)

Least recently used

C)

Last recently used

D)

Least recently utilized

Correct Answer : Least recently used

Explanation : LRU stands for least recently used.

42 .

When the server is shut down or restarted, all Memcached data is ____?

A)

Restored

B)

Rolled Back

C)

Destroyed

D)

None of the above

Correct Answer : Destroyed

Explanation : When the server is shut down or restarted, all Memcached data is destroyed.

43 .

Is Data stored in Memcached permanently stored?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : No

Explanation : No, data stored in Memcached is not permanently stored. It is temporally stored data.

44 .

As we know that the Decr command in Memcached is used to decrease the numeric value of an existing key, what will happen if the key is not numeric?

A)

NOT FOUND

B)

Returns Nothing

C)

CLIENT_ERROR cannot increment or decrement non-numeric value

D)

None of the above

Correct Answer : CLIENT_ERROR cannot increment or decrement non-numeric value

Explanation : CLIENT_ERROR cannot increment or decrement non-numeric value.

45 .

Is Memcached a database?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : No

Explanation : Memcached is a memory cache, not a database. It just saves transient data.

46 .

Dogpile effect can be prevented using which of the following?

A)

Deadlock

B)

Bootloader

C)

Scheduler Locker

D)

Semaphore Lock

Correct Answer : Semaphore Lock

Explanation : The dogpile effect can be prevented using a semaphore lock.

47 .

The ____ occurs when the cache expires and websites are attacked by many requests from the client at the same time.

A)

CAS

B)

LRU

C)

Slab allocator

D)

Dogpile effect

Correct Answer : Dogpile effect

Explaination : The Dogpile effect occurs when the cache expires and websites are attacked by many requests from the client at the same time.

48 .

Each Memcached have ____ unique key.

A)

One

B)

More than one

C)

Many

D)

None of the above

Correct Answer : One

Explanation : Each Memcached has one unique key.

49 .

Which of the following command is used to close the connection?

A)

End

B)

Close

C)

Quit

D)

Delete

Correct Answer : Quit

Explanation : The quit command is used to close the connection.

50 .

Which of the following command returns server statistics such as version, and connections?

A)

Stats

B)

Info

C)

Facts

D)

Statistics

Correct Answer : Stats

Explanation : The Memcached stats command returns server statistics such as PID, version, connections, and so on.