database-mysql
MySQL/MariaDB database inspection and queries. Use when investigating table schemas, running queries, checking processlist, replication status, InnoDB engine status, or lock contention.
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- incidentfox/incidentfox
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- February 19, 2026 at 07:22
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- database-mysql
- description
- MySQL/MariaDB database inspection and queries. Use when investigating table schemas, running queries, checking processlist, replication status, InnoDB engine status, or lock contention.
- allowed-tools
- Bash(python *)
# MySQL Database
## Authentication
**IMPORTANT**: Credentials are injected automatically by a proxy layer. Do NOT check for `MYSQL_PASSWORD` in environment variables - it won't be visible to you. Just run the scripts directly; authentication is handled transparently.
Configuration environment variables you CAN check (non-secret):
- `MYSQL_HOST` - Database host
- `MYSQL_PORT` - Database port (default: 3306)
- `MYSQL_DATABASE` - Database name
---
## MANDATORY: Schema-First Investigation
**Understand the schema before running queries.**
```
LIST TABLES → DESCRIBE TABLE → EXECUTE QUERY → CHECK HEALTH
```
## Available Scripts
All scripts are in `.claude/skills/database-mysql/scripts/`
### list_tables.py - List Tables (START HERE)
```bash
python .claude/skills/database-mysql/scripts/list_tables.py [--database DB]
```
### describe_table.py - Table Schema Details
```bash
python .claude/skills/database-mysql/scripts/describe_table.py --table TABLE_NAME [--database DB]
```
### execute_query.py - Run SQL Queries
```bash
python .claude/skills/database-mysql/scripts/execute_query.py --query "SELECT * FROM users LIMIT 10" [--limit 100]
```
### show_processlist.py - Active Connections
```bash
python .claude/skills/database-mysql/scripts/show_processlist.py [--full]
```
### show_replica_status.py - Replication Health
```bash
python .claude/skills/database-mysql/scripts/show_replica_status.py
```
### show_engine_status.py - InnoDB Engine Status
```bash
python .claude/skills/database-mysql/scripts/show_engine_status.py [--engine innodb]
```
### get_table_locks.py - Lock Contention
```bash
python .claude/skills/database-mysql/scripts/get_table_locks.py
```
---
## Investigation Workflow
### Slow Query Investigation
```
1. show_processlist.py --full (find active/long queries)
2. show_engine_status.py (check InnoDB lock waits, deadlocks)
3. get_table_locks.py (find lock contention)
```
### Replication Lag
```
1. show_replica_status.py (check Seconds_Behind_Master)
2. show_processlist.py (check for blocking queries)
```
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