altinity-expert-clickhouse-connection
Should be used when doing clickhouse analysis and diagnostics review before any altinity-expert-clickhouse skill to test clickhouse connection and set general rules
Full skill instructions
Decide connection mode first and verify connectivity then:
select
hostName() as hostname,
version() as version,
getMacro('cluster') as cluster_name,
formatReadableTimeDelta(uptime()) as uptime_human,
getSetting('max_memory_usage') as max_memory_usage,
(select value from system.asynchronous_metrics where metric = 'OSMemoryTotal') as os_memory_total
Try to use MCP server with clickhouse in the name. If multiple ClickHouse MCP servers are available, ask the user which one to use. When executing queries by the MCP server, push a single SQL statement to the MCP server (no multy query!)
clickhouse-client. Don't rely on env vars. On failure, ask how to run it properly..sql file with --queries-file and forcing JSON output (-f JSON) when capturing results to files.clusterAllReplicas('{cluster}', ...)SELECT DISTINCT cluster FROM system.clusters where not is_local and replace '{cluster}' placeholders in the queries in all .sql files.clusterAllReplicas('{cluster}', system.<table>) → system.<table> before execution.-- Use this pattern for system.*_log tables and system.errors time filters:
-- WHERE event_time >= now() - INTERVAL 24 HOUR
UNKNOWN_IDENTIFIER, run DESCRIBE TABLE system.<table> and drop/adjust only the missing columns.UNKNOWN_TABLE, skip that query and note the table is disabled or unavailable (e.g., system.part_log, system.detached_parts).In all reports, always provide a header with information:
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