How can you improve the performance of a $lookup operation in MongoDB?
Use $project to limit fields returned after the $lookup
Avoid using $lookup altogether
Use $sort after the $lookup stage
Use $match to filter documents before the $lookup stage
Choosing an inappropriate shard key can lead to which of the following issues?
Decreased storage requirements
Simplified data backup processes
Reduced query performance
Improved data security
Which of the following is a recommended practice when using transactions in MongoDB?
Keeping transactions as long-running as possible to maximize the number of operations covered.
Keeping transactions short-lived and focused to minimize locking overhead and potential for conflicts.
Including as many operations as possible within a single transaction to simplify code logic.
Avoiding the use of indexes within transactions as they can negatively impact performance.
Which aggregation stage allows you to perform complex data transformations within a group in MongoDB?
$project
$sort
$match
$group
Which sharding strategy distributes data based on ranges of the shard key values?
Hashed sharding
Random sharding
Zone sharding
Ranged sharding
Which stage of the MongoDB write path is responsible for applying write operations to the journal?
Release Locks
Apply Operation
Write to Journal
Intent Shared Lock
Which of these is a potential drawback of embedding documents in MongoDB?
Reduced performance when retrieving deeply nested data
Increased complexity in querying related data
Inability to represent one-to-many relationships effectively
Data duplication if not carefully managed
In WiredTiger, what data structure is used to store data on disk?
Hash Table
Skip List
B-Tree
Log-Structured Merge Tree
Which stage allows for conditional execution of pipeline stages in MongoDB's aggregation framework?
$switch
$cond
$ifNull
$case
Which security feature helps ensure that only authorized personnel can modify the configuration settings of a MongoDB deployment?
Field Level Encryption
Auditing
Role-Based Access Control (RBAC)
Data Masking