20+ practice questions focused on Server Administration — one of the most tested topics on the MongoDB Certified DBA Associate exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Server Administration PracticeRefer to the exhibit. Based on the provided YAML configuration snippet, what will be the behavior of the mongod instance regarding memory allocation on a host with 16GB of total system RAM?
Explanation: Administrators must understand how to manually override default settings to optimize performance or coexist with other applications. By default, WiredTiger uses 50% of (RAM - 1GB). On a 16GB host, the default would be 7.5GB. However, the configuration explicitly restricts the internal cache to 2GB, which is useful when running multiple instances or memory-constrained containers.
A production environment requires point-in-time recovery for a 2TB database. Which TWO strategies are most appropriate for minimizing recovery time while ensuring data consistency?
Explanation: Point-in-time recovery (PITR) is a fundamental requirement for production database administration. Filesystem snapshots provide a fast way to restore large volumes of data, while the oplog (operations log) allows the DBA to replay changes up to a specific second. Combining these ensures that even a 2TB dataset can be restored quickly without full BSON re-indexing.
When performing a rolling upgrade of a MongoDB replica set from version 5.0 to 6.0, which TWO steps are mandatory to ensure cluster stability and compatibility?
Explanation: Upgrading a replica set requires a specific sequence to maintain availability and prevent data corruption. Administrators must ensure that the 'featureCompatibilityVersion' (FCV) matches the old version before starting. Upgrading secondaries first ensures that if a failure occurs, the primary can still function on the old version while the administrator troubleshoots the upgrade process.
A database administrator notices that the WiredTiger cache is frequently reaching its maximum size, causing excessive eviction. Which configuration change is the most appropriate to manage memory pressure in a standalone node?
Explanation: Tuning the WiredTiger cache size is critical for maintaining performance in memory-constrained environments. By adjusting the 'wiredTiger.engineConfig.cacheSizeGB' parameter, administrators can balance the memory allocated to the engine versus the operating system. This prevents the operating system from swapping to disk, which would otherwise degrade latency. Properly sizing the cache ensures that the working set fits efficiently in RAM, reducing the need for constant page evictions and improving overall throughput.
An administrator is planning a backup strategy for a replica set. Which TWO of the following methods allow for consistent backups without stopping the MongoDB service?
Explanation: Maintaining data availability during backups is a primary operational requirement. File system snapshots and MongoDB-native tools like mongodump or dedicated backup solutions are designed for this purpose. Understanding these methods is essential for creating reliable recovery points without causing downtime, which is critical for production environments where continuous availability is mandatory for business continuity and compliance with service level agreements.
+15 more Server Administration questions available
Practice all Server Administration questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Server Administration. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Server Administration questions on the C100DBA frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Server Administration is tested as part of the MongoDB Certified DBA Associate blueprint. Practicing with targeted Server Administration questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free C100DBA practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but Server Administration is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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