查询当前进行中的query
SELECT
query_id,
read_rows,
total_rows_approx,
memory_usage,
initial_user,
initial_address,
elapsed,
query,
client_hostname
FROM system.processes;
查询最后一个状态为"查询完成"的query
SELECT * FROM system.query_log WHERE type = 'QueryFinish' ORDER BY query_start_time DESC LIMIT 1 FORMAT Vertical;
查看是否复制失败
SELECT database, table, is_leader, total_replicas,active_replicas FROM system.replicas WHERE is_readonly OR is_session_expired OR future_parts > 20 OR parts_to_check > 10 OR queue_size > 20 OR inserts_in_queue > 10 OR log_max_index - log_pointer > 10 OR total_replicas < 2 OR active_replicas < total_replicas;