Table disk usage clickhouse
Top 20 tables by on-disk size
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'
more clickhouse
all 17 commands →
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
Check replication status
clickhouse-client -q 'SELECT database, table, is_leader, queue_size, absolute_delay FROM system.replicas WHERE absolute_delay > 0'
Slowest recent queries
clickhouse-client -q "SELECT query_duration_ms, formatReadableSize(memory_usage) mem, substring(query,1,80) FROM system.query_log WHERE type=2 AND event_time>now()-3600 ORDER BY query_duration_ms DESC LIMIT 10"
Pending mutations
clickhouse-client -q "SELECT database, table, mutation_id, latest_fail_reason FROM system.mutations WHERE is_done=0"