# Mongodb

> MongoDB best practices including schema design, indexing, and query optimization. Use when this capability is needed.

- Skill: `tomevault-io/mongodb` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/mongodb`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/mongodb/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/mongodb

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# MongoDB Best Practices

## Schema Design
- Embed data for 1:few relationships
- Reference data for 1:many relationships
- Avoid unbounded arrays
- Use meaningful field names
- Plan for your query patterns

## Indexing
- Index fields used in queries
- Use compound indexes wisely
- Monitor index size
- Use TTL indexes for expiring data
- Text indexes for search

## Queries
- Use projection to limit fields
- Use aggregation pipeline for complex queries
- Avoid $where and $regex when possible
- Use explain() to analyze queries
- Paginate with skip/limit or cursor

## Performance
- Use connection pooling
- Shard for horizontal scaling
- Use read preferences
- Enable compression
- Monitor with mongotop/mongostat

## Security
- Enable authentication
- Use role-based access control
- Encrypt data at rest
- Use TLS for connections
- Validate input data

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