Associate Database Administrator

As a MongoDB Associate Database Administrator, I possess a solid understanding of MongoDB's core philosophy, its distinctive features, and how it differs from traditional RDBMS databases. I am proficient in various methods to access and administer MongoDB instances, and I grasp the function of sharding for horizontal scalability.

My capabilities extend to performing a wide range of CRUD (Create, Read, Update, Delete) operations. This includes correctly forming insert commands for structured documents, understanding the impact of updates with and without operators like $set, and utilizing upserts effectively. I can manage concurrent operations using findAndModify, handle multi-document updates, and accurately delete documents. I am adept at querying data using equality constraints (including on array fields), comparison operators, $in, and $elemMatch, as well as combining conditions with logical operators. Furthermore, I can sort, limit, and project query results, count matching documents, and perform basic aggregations using $match and $group.

I am skilled in optimizing query performance through effective index management, identifying which indexes will improve performance for various query types, including those on array fields or requiring multi-field sorts. I can analyze explain plans to diagnose issues like collection scans, understand multi-key index limitations, and validate index usage. In server administration, I can manage mongod processes by starting, stopping, checking status, and configuring parameters using mongosh. I am also proficient in managing replica sets, including adding and removing nodes, and understanding replication concepts such as primary/secondary roles, read preferences, write concerns, elections, and the oplog. My abilities cover monitoring database health by interpreting common alerts, running currentOp, viewing active operations, monitoring storage, and recognizing signs of diminishing storage. I can implement crucial security measures such as enabling TLS and authentication, defining and managing roles and privileges for authorization, and understand data protection through encryption at rest, field-level encryption, and audit logging. Finally, I know how to create backups of a replica set to ensure data recoverability.