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ClickHouse

有没有熟悉 clickhouse 的? clickhouse 对于分布式支持的如何? ClickHouse 的 MaterializedMySQL 引擎 - V2EX 两条数据库创建语句产生了同样的效果 CREATE DATABASE hello1; 与 CREATE DATABASE hello ON CLUSTER 'xxxxx'; 大佬们,我又来了!群晖装 clickhouse,撑得住吗? 究竟是什么在占用着内存 求大佬优化一下 3000 万数据的 NOT IN 查询 求大佬优化 3000w 数据多 UNION 请教各位大佬关于 clickhouse 的问题 - V2EX 我这个场景, clickhouse 适用吗? - V2EX
clickhouse 文档里的划分冷热多盘存储配置真的是按时间划分冷热数据的吗? - V2EX
meso5533 · 2022-10-09 · via ClickHouse

这是一个创建于 1344 天前的主题,其中的信息可能已经有所发展或是发生改变。

https://clickhouse.com/docs/en/engines/table-engines/mergetree-family/mergetree/#table_engine-mergetree-multiple-volumes

move_factor:when the amount of available space gets lower than this factor, data automatically starts to move on the next volume if any (by default, 0.1). ClickHouse sorts existing parts by size from largest to smallest (in descending order) and selects parts with the total size that is sufficient to meet the move_factor condition. If the total size of all parts is insufficient, all parts will be moved.

看文档的解释,应该是按 part 的大小优先把大的 part 移到下一个盘

但是什么样的数据会被合并成一个 part 的呢?

大的 part 一定就是时间久远的数据吗?