MongoDB Transactions, Replication & Sharding (original) (raw)

What does ACID stand for in MongoDB transactions?

• Atomicity, Consistency, Isolation, Durability
• Aggregation, Clustering, Indexing, Durability
• Authentication, Consistency, Integrity, Data Model
• Atomicity, Caching, Isolation, Database

Which MongoDB feature allows performing multi-document transactions?

When should you use embedded documents instead of references in MongoDB?

• When related data is frequently accessed together
• When data needs to be normalized
• When you have many-to-many relationships
• When foreign key constraints are required

What is the primary purpose of MongoDB replication?

• To speed up aggregation queries
• To distribute data across multiple shards
• To provide high availability and data redundancy
• To enforce schema validation

What is a primary node in a MongoDB replica set?

• A node responsible for backup operations
• The node that handles all write operations
• A secondary node used only for reads
• A configuration node for routing queries

What is the function of a shard key in MongoDB?

• It uniquely identifies documents in a collection
• It determines how data is distributed across shards
• It indexes documents for fast retrieval
• It compresses data for efficient storage

What is the difference between Ranged Sharding and Hashed Sharding?

• Ranged sharding distributes data evenly, while hashed sharding clusters similar values
• Ranged sharding is used for unstructured data, while hashed sharding is used for numeric data
• Ranged sharding stores values in an increasing order, while hashed sharding distributes them randomly
• Ranged sharding uses a round-robin approach, while hashed sharding sorts data in memory

How can you enable authentication in MongoDB?

• By setting "auth": true in the MongoDB configuration file
• By using the $auth command in the shell
• By enabling read-only mode for users
• By granting dbAdmin privileges to all users

What does Role-Based Access Control (RBAC) do in MongoDB?

• Allows users to create custom indexes
• Grants different access levels based on assigned roles
• Encrypts all database operations
• Prevents query execution unless manually approved

What is the best practice to secure MongoDB against unauthorized access?

• Run MongoDB on the default 0.0.0.0 IP address
• Disable authentication for all users
• Enable TLS/SSL encryption and restrict network access
• Store passwords in plaintext for easy recovery

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