MongoDB DBA C100DBA Practice Tests | Exam Prep [2026]

The C100DBA exam covers the core skills every MongoDB database administrator needs — from basic CRUD to replica set failovers to security hardening. It's a broad exam, and the only reliable way to know you're ready is to test yourself under real conditions.This course gives you 6 timed practice exams with 396 questions total. The questions hit every C100DBA domain at roughly the same weight as the exam, and every answer option comes with a written explanation — not just "this is correct," but why the other choices fall short.What you'll be tested on:CRUD Operations — insertOne vs insertMany, find projections, update operators ($set, $push, $unset), deleteMany filters, write concerns, read preferences, bulk writesIndexes — Single field, compound, multikey, text, geospatial, wildcard. Index intersection, covered queries, and reading explain() outputReplication — Replica set architecture, elections and priority, oplog sizing, read/write concern levels, rollback scenarios, hidden and delayed membersSecurity — SCRAM-SHA-256, x.509 certificates, LDAP proxy auth, role-based access control, custom roles, encryption at rest, TLS configurationServer Administration — mongod startup options, config file syntax, storage engine behavior (WiredTiger), log rotation, diagnostics with serverStatus and currentOpMonitoring & Backup — mongostat, mongotop, profiler levels, Atlas monitoring metrics, mongodump/mongorestore, oplog-based backup, point-in-time recoveryExam format:90 minutes per practice test, 65% passing thresholdRandomized question order on every attemptScenario questions mixed with direct-knowle