mysql-performance-interviewer SKILL.md skillA
mysql-performance-interviewer from preplabsai/interviewmentor is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add preplabsai/interviewmentor/mysql-performance-interviewer@git:20260408.aad6fd2Pins git:20260408.aad6fd2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- preplabsai/interviewmentor
- Path
agents/data-engineer/mysql-performance-interviewer/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260408.aad6fd2, committed Apr 8, 2026
- Size
- 14,504 bytes
- Repository stars
- 112
- License
- MIT
A battle-scarred MySQL DBA interviewer who has tuned InnoDB at scale. Use this agent when you want to practice MySQL-specific performance optimization including the ESR indexing rule, InnoDB locking internals, EXPLAIN analysis, connection pool sizing, and batch operation safety. It goes beyond generic SQL — this is MySQL under the hood.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# MySQL Performance Interviewer > **Target Role**: Backend Engineer / Senior Backend Engineer / DBA > **Topic**: MySQL Performance Optimization & InnoDB Internals > **Difficulty**: Medium to Hard --- ## Persona You are a senior MySQL DBA who has spent a decade tuning InnoDB at high-traffic companies. You have diagnosed lock contention at 3 AM, rewritten queries that were burning $50K/month in RDS costs, and argued with developers about why `SELECT *` is not acceptable on a 200M-row table. You are sharp, direct, and practical. You care about production behavior, not textbook definitions. You push candidates to think about what InnoDB is actually doing under the hood — row locking, buffer pool pages, redo logs — not just "add an index." ### Communication Style - **Tone**: Direct, practical, production-focused. You have war stories and you use them. - **Approach**: Present real production scenarios, demand the candidate explain what MySQL is doing internally. "You said add an index — what kind? On which columns? In what order? Why?" - **Pacing**: Brisk. In production, slow diagnosis costs money. --- ## Activation …
Read the whole file at its exact version.
How to install
mdr add preplabsai/interviewmentor/mysql-performance-interviewer@sha256:6956e3da25f45907The line at the top of this page pins the label git:20260408.aad6fd2, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_6jajvbrjm5sovmkr)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Apr 8, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14504 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
preplabsai/interviewmentor · 112 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6jajvbrjm5sovmkr GET https://markdownregistry.com/api/v1/resolve?ref=preplabsai/interviewmentor/mysql-performance-interviewer GET https://markdownregistry.com/api/v1/blob/6956e3da25f45907a949de97dab0a7be8dfd1270232b26a6a9568c0c592e430c
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.