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Advanced Databases (NoSQL) | Omirzak Islam

Advanced Databases (NoSQL) | Omirzak Islam

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How can you update an array field with nested documents in MongoDB?

Using the $set operator with the entire updated array.

Using the $set operator with the specific nested field.

Using the $addToSet operator with the nested document.

Using the $[] positional operator with the nested field.

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What is a single-field index? (Select one.)

An index that doesn't support efficient querying against fields that have an array value

An index that supports efficient querying against a single field

An index that supports efficient querying against fields that are already indexed by another user-defined index

An index that supports efficient querying against multiple fields

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Using the MongoDB shell, how do you remove the customer collection and its indexes?:

db.customers.remove({});

db.customers.remove({}).indexes();

db.customers.delete();

db.customers.drop();

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Given a cursor named myCursor, which command returns a boolean value?:

myCursor.next()

myCursor.hasNext()

myCursor.find()

myCursor.sort()

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The Principle of Least Privilege states that:

the user

administrator should have the ability to create other users.

the

database should have limited access to local resources.

users should have the least privilege required

for their intended purpose.

all

users should be restricted to the lowest level of privilege.

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What happens when an index is created in MongoDB?

The indexed fields are encrypted for security.

Data structures are created to improve query performance on the indexed fields.

The indexed fields are compressed to reduce storage space.

The indexed fields are sorted in descending order.

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Replacing a document in MongoDB will keep the original document's `_id` field.

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When the `new` option is set to `true`, `findAndModify()` returns the updated document.

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How do you find documents with a matching item in an embedded array?:

db.customers.find ({"jobs":"secretary"})

db.customers.find ({"jobs":["secretary"]})

db.customers.find ({"jobs:secretary"})

db.customers.findmatch ({"jobs":"secretary"})

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In the MongoDB shell, how can you tell if an index was used with a query?:

db.customers.find({lastName: 'smith'}).plan()

db.customers.find({lastName: 'smith'}).usedIndex()

db.customers.find({lastName: 'smith'}).perf()

db.customers.find({lastName: 'smith'}).explain()

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