MongoDB Practice Test 2

1. When inserts, updates and deletes have a _________ write concern, write operations return quickly.

average

very strong

strong

weak

2. Which of the following method is called while accessing documents using the array index notation?

all of the mentioned

cur.toArray()

doc.toArray()

cursor.toArray()

3. The default chunk size is changed from 256k to 255k in which version?

3.0

None of the mentioned

2.4.9

2.4.10

4. Point out the wrong statement.

Field names in MongoDB’s query language have semantic meaning

Client libraries provide a convenient, injection free, process to build these objects

MongoDB represents queries as BSON objects

All of the mentioned

5. Point out the wrong statement.

For queries that include a sort operation without an index, the server must load all the documents in memory to perform the sort before returning any results

All of the mentioned

The MongoDB Wire Protocol is a simple socket-based, request-response style protocol

Clients communicate with the database server through a regular TCP/IP socket

6. Which of the following statement will insert 400 documents in to the testData collection?

insertData("test", "testData", 400)

insertData("test", "testData", 600)

all of the mentioned

insertData("test", "testData", 200)

7. Which of the following function is valid for creation of new data inside MongoDB Shell?

function insertData(dbName, colName, num) 
{

  var col = db.getSiblingDB(dbName).getCollection(colName);

  for (i = 0; i < num; i++) 
  {
    col.insert({x:i});
  }

  print(col.count());

}

function insertData(dbName, colName, num) 
{

  var col = db.getSiblingDB(dbName).getCollection(colName);

  for (i = 0; i < num; i++) 
  {
      col.insertData({x:i});
  }

  print(col.count());

}

None of the mentioned

 
insertData(dbName, colName, num) 
{

  var col = db.getSiblingDB(dbName).getCollection(colName);

  for (i = 0; i < num; i++) 
  {
    col.insert({x:i});
  }

  print(col.count());

}

8. ___________ is used to determine whether a query is a covered query.

explainstats()

explain()

all of the mentioned

explainall()

9. MongoDB does not ___________ modifications made before the wtimeout interval expired.

rollback

save

all of the mentioned

commit

10. Which of the following checks and repairs errors and inconsistencies in data storage?

recoverDatabase

all of the mentioned

repairedDatabase

repairDatabase