Connect and run a query clickhouse
Execute a one-shot query via clickhouse-client
clickhouse-client --host ch.example.com --user default --password secret -q 'SELECT version()'
more clickhouse
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Check running queries
clickhouse-client -q 'SELECT query_id, elapsed, query FROM system.processes ORDER BY elapsed DESC LIMIT 10'
Kill a running query
clickhouse-client -q "KILL QUERY WHERE query_id = 'abc-123'"
Table disk usage
clickhouse-client -q 'SELECT database, table, formatReadableSize(sum(bytes_on_disk)) AS size FROM system.parts GROUP BY database, table ORDER BY sum(bytes_on_disk) DESC LIMIT 20'
Optimize table (force merge)
clickhouse-client -q 'OPTIMIZE TABLE mydb.mytable FINAL'
Ingest CSV from file
clickhouse-client --query 'INSERT INTO mydb.events FORMAT CSVWithNames' < events.csv