altinity/altinity-expert-clickhouse-dictionaries
altinity-expert-clickhouse/skills/altinity-expert-clickhouse-dictionaries/SKILL.md
Analyze ClickHouse external dictionaries including configuration, memory usage, reload status, and performance. Use for dictionary issues and load failures.
$ install --global
skillsauthnpx skillsauth add altinity/skills altinity-expert-clickhouse-dictionariesInstall 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.
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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%
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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, 2:07 AM210.5s1 file scanned
SKILL.md
- name:
- altinity-expert-clickhouse-dictionaries
- description:
- Analyze ClickHouse external dictionaries including configuration, memory usage, reload status, and performance. Use for dictionary issues and load failures.
- license:
- Apache-2.0
Dictionary Diagnostics
Analyze external dictionaries: configuration, memory usage, reload status, and performance.
Diagnostics
Run all queries from checks.sql in this skill's directory and analyze the results.
Dictionary Reload Operations
Force Reload (syntax reference)
-- SYSTEM RELOAD DICTIONARY {database}.{name}
-- SYSTEM RELOAD DICTIONARIES
Check Reload Result for Specific Dictionary
-- Check reload result
select
name,
status,
loading_start_time,
loading_duration,
last_exception
from system.dictionaries
where name = '{dictionary_name}'
Best Practices
Dictionary Sizing Guidelines
| Elements | Recommended Type | |----------|-----------------| | < 100K | Flat (if sequential keys) | | 100K - 10M | Hashed | | > 10M | Consider partitioning or cache | | Complex keys | ComplexKeyHashed | | Sparse access | Cache with SSD |
Common Issues
| Symptom | Cause | Solution | |---------|-------|----------| | High memory | Too many elements | Use cache type, filter data | | Slow reload | Large source table | Add filters, use delta updates | | Stale data | Source unreachable | Check connectivity, add retry | | Failed status | Source query fails | Check source table/query |
Cross-Module Triggers
| Finding | Load Module | Reason |
|---------|-------------|--------|
| High memory usage | altinity-expert-clickhouse-memory | Overall memory analysis |
| Load failures | altinity-expert-clickhouse-overview | Error summary + routing |
| Source connectivity | altinity-expert-clickhouse-logs | Log investigation |
| Slow lookups | altinity-expert-clickhouse-reporting | Query optimization |
Settings Reference
| Setting | Notes |
|---------|-------|
| dictionaries_lazy_load | Load on first access vs startup |
| dictionary_load_wait_timeout_ms | Wait time for lazy load |
| max_dictionary_num_to_warn | Warning threshold |
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