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Diagnose ClickHouse disk usage, compression efficiency, part sizes, and storage bottlenecks. Use for disk space issues and slow IO.
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SOC 職業分類に基づく
Read-only ClickHouse security audit expert for live or exported systems. Use when assessing ClickHouse security posture, reviewing users, roles, grants, settings profiles, row policies, table functions, external sources, table engines, executable UDFs, audit logs, named collections, password hash hygiene, SQL SECURITY DEFINER, impersonation, TLS/network exposure, Keeper/interserver security, encryption at rest, backups, the HTTP interface surface, cluster security, or version-specific ClickHouse security behavior. Diagnoses from SQL/system tables, supplied configuration files, query logs, access metadata, and ClickHouse/Altinity documentation.
Diagnose and resolve ClickHouse grant and authentication errors, especially after upgrades. Use when queries fail with ACCESS_DENIED/NOT_ENOUGH_PRIVILEGES, AUTHENTICATION_FAILED/WRONG_PASSWORD/REQUIRED_PASSWORD, or ON CLUSTER privilege errors; when system.* or INFORMATION_SCHEMA access is denied; or when grant behavior changes after version upgrades.
Analyze ClickHouse cache systems including mark cache, uncompressed cache, and query cache. Use for cache hit ratio issues and cache tuning.
Establishes the ClickHouse connection mode, cluster macro, and default log timeframe for diagnostics. Use first, before any other altinity-expert-clickhouse skill, to verify connectivity and set shared analysis rules.
Analyze ClickHouse external dictionaries including configuration, memory usage, reload status, and performance. Use for dictionary issues and load failures.
Analyze whether ClickHouse indexes (PRIMARY KEY, ORDER BY, skipping indexes, projections) are being used effectively for actual query patterns. Use when investigating index effectiveness, ORDER BY key design, query-to-index alignment, or when queries scan more data than expected.
| 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 |
Diagnose disk usage, compression efficiency, part sizes, and storage bottlenecks.
Run all queries from checks.sql in this skill's directory and analyze the results.
-- Always limit results
limit 100
-- For part_log
where event_date >= today() - 1
system.disks - Disk configurationsystem.parts - Part storage detailssystem.columns - Column compressionsystem.storage_policies - Tiered storagesystem.detached_parts - Orphaned parts| 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 |
| 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) |