altinity-expert-clickhouse-storage
Diagnose ClickHouse disk usage, compression efficiency, part sizes, and storage bottlenecks. Use for disk space issues and slow IO.
Full skill instructions
Diagnose disk usage, compression efficiency, part sizes, and storage bottlenecks.
Run all queries from the file checks.sql 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) |
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