数据量大的查询导致connection refused。
clickhouselog： /var/log/clickhouse-server/
Setting max_server_memory_usage was set to 28.09 GiB (31.22 GiB available * 0.90 max_server_memory_usage_to_ram_ratio)
服务器配置如下；
CK建议最低内存128G。
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