altinity/altinity-expert-clickhouse-storage
altinity-expert-clickhouse/skills/altinity-expert-clickhouse-storage/SKILL.md
Diagnose ClickHouse disk usage, compression efficiency, part sizes, and storage bottlenecks. Use for disk space issues and slow IO.
$ install --global
skillsauthnpx skillsauth add altinity/skills altinity-expert-clickhouse-storageInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
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Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
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CrowdStrikeAdvanced threat intelligence
50%
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OSV-ScannerOpen Source Vulnerability database check
50%
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OWASP Dep-Check
50%
Last scanned: Jun 2, 2026, 2:12 AM372.0s1 file scanned
SKILL.md
- name:
- altinity-expert-clickhouse-storage
- description:
- Diagnose ClickHouse disk usage, compression efficiency, part sizes, and storage bottlenecks. Use for disk space issues and slow IO.
- license:
- Apache-2.0
Storage and Disk Usage Analysis
Diagnose disk usage, compression efficiency, part sizes, and storage bottlenecks.
Diagnostics
Run all queries from checks.sql in this skill's directory and analyze the results.
Ad-Hoc Query Guidelines
Required Safeguards
-- Always limit results
limit 100
-- For part_log
where event_date >= today() - 1
Key Tables
system.disks- Disk configurationsystem.parts- Part storage detailssystem.columns- Column compressionsystem.storage_policies- Tiered storagesystem.detached_parts- Orphaned parts
Cross-Module Triggers
| Finding | Load Module | Reason |
|---------|-------------|--------|
| Poor compression | altinity-expert-clickhouse-schema | Codec recommendations |
| Many small parts | altinity-expert-clickhouse-merges | Merge backlog |
| High write IO | altinity-expert-clickhouse-ingestion | Batch sizing |
| System logs large | altinity-expert-clickhouse-logs | TTL configuration |
| Slow disk + merges | altinity-expert-clickhouse-merges | Merge optimization |
Settings Reference
| Setting | Notes |
|---------|-------|
| min_bytes_for_wide_part | Threshold for Wide vs Compact parts |
| min_rows_for_wide_part | Row threshold for Wide parts |
| max_bytes_to_merge_at_max_space_in_pool | Max merge size |
| prefer_not_to_merge | Disable merges (emergency) |
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