altinity/altinity-expert-clickhouse-part-log
altinity-expert-clickhouse/skills/altinity-expert-clickhouse-part-log/SKILL.md
Diagnose ClickHouse issues by analyzing system.part_log (part creation, merges, mutations, downloads, removals, moves). Use for too many parts / micro-batch inserts, merge backlog or slow merges, mutation storms (ALTER DELETE/UPDATE), unusual replication DownloadPart churn, unexpected RemovePart spikes, or ZooKeeper/Keeper znode growth correlated with part activity.
$ install --global
skillsauthnpx skillsauth add altinity/skills altinity-expert-clickhouse-part-logInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
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%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Jun 2, 2026, 2:06 AM129.7s1 file scanned
SKILL.md
- name:
- altinity-expert-clickhouse-part-log
- description:
- Diagnose ClickHouse issues by analyzing system.part_log (part creation, merges, mutations, downloads, removals, moves). Use for too many parts / micro-batch inserts, merge backlog or slow merges, mutation storms (ALTER DELETE/UPDATE), unusual replication DownloadPart churn, unexpected RemovePart spikes, or ZooKeeper/Keeper znode growth correlated with part activity.
- license:
- Apache-2.0
Part Log Based Diagnostics
Run all queries from checks.sql in this skill's directory (cluster-wide) and interpret the top offenders by rate (events/min), volume (rows/bytes), and errors.
Notes:
- Default timeframes are relative (e.g., last 1h/6h/24h). Only switch to an explicit time range when the user provides one in the prompt.
- Replace
{cluster}with your ClickHouse cluster name (DataGrip). - Keep queries time-bounded (
event_time > now() - INTERVAL ...) and useLIMIT. - If a query fails due to schema differences, run
DESCRIBE TABLE system.part_logand drop only missing fields.
Cross-module triggers:
- High
NewPartrate / micro-batches → loadaltinity-expert-clickhouse-ingestion+altinity-expert-clickhouse-merges - High
MutatePartrate → loadaltinity-expert-clickhouse-mutations - Many
DownloadPart→ loadaltinity-expert-clickhouse-replication - Merge saturation / slow merges → load
altinity-expert-clickhouse-merges+altinity-expert-clickhouse-storage
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