What is altinity-expert-clickhouse-part-log?

A guide for diagnosing ClickHouse storage activity through the system part log. A part is a piece of table data that ClickHouse creates, merges, moves, or removes.

Use it to analyze part creation, merges, updates and deletes, downloads, removals, moves, event rates, data volume, and errors.

It helps explain too many small inserts, delayed merges, repeated data changes, replication activity, and other storage problems.

altinity-expert-clickhouse-part-log — Skill for Claude Code and Codex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add Altinity/altinity-skills --skill altinity-expert-clickhouse-part-log

Clone the repo

git clone --depth 1 https://github.com/Altinity/altinity-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/altinity/altinity-skills/altinity-expert-clickhouse-part-log/github.svg)](https://agentmods.dev/skills/altinity/altinity-skills/altinity-expert-clickhouse-part-log)

Your own site

<a href="https://agentmods.dev/skills/altinity/altinity-skills/altinity-expert-clickhouse-part-log"><img src="https://agentmods.dev/badge/skills/altinity/altinity-skills/altinity-expert-clickhouse-part-log/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/altinity/altinity-skills/altinity-expert-clickhouse-part-log"><img src="https://agentmods.dev/badge/skills/altinity/altinity-skills/altinity-expert-clickhouse-part-log.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 352 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00083	$0.00352
Opus 5	$0.00042	$0.00176
Sonnet 5	$0.00017	$0.00070
Haiku 4.5	$0.00008	$0.00035

Measured 10d ago against content hash 41dde62edefe, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

altinity-expert-clickhouse-part-log scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

altinity-expert-clickhouse/skills/altinity-expert-clickhouse-part-log/SKILL.md · 22 lines

What it actually says

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 use LIMIT.
If a query fails due to schema differences, run DESCRIBE TABLE system.part_log and drop only missing fields.

Cross-module triggers:

High NewPart rate / micro-batches → load altinity-expert-clickhouse-ingestion + altinity-expert-clickhouse-merges
High MutatePart rate → load altinity-expert-clickhouse-mutations
Many DownloadPart → load altinity-expert-clickhouse-replication
Merge saturation / slow merges → load altinity-expert-clickhouse-merges + altinity-expert-clickhouse-storage

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

checks.sql 5.7 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 22 lines · 83 tokens per session scan A 41dde62edefe

Subscribe to this mod's changes

altinity-expert-clickhouse-part-log is a skill published in the GitHub repository Altinity/altinity-skills (16 stars, last pushed yesterday), licensed Apache-2.0. It adds 83 tokens to every session and 352 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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