Data granularity refers to which of the following? a. The primary key in the dimension table in the data warehouse. b. The foreign key in the dimension table in the data warehouse. c. The level of det You are c
Information systems are created for holding and moving data and information in every department of a business organization. These refer to a series of programs that can efficiently help in carrying daily business activities, controlling inventory operations, and making basic and even complex decisions ...
SETTINGS:index_granularity:索引粒度,默认值8192。也就是说,默认情况下每隔8192行数据才生成一条索引; SETTINGS:index_granularity_bytes:在19.11版本之前,ClickHouse只支持固定大小的索引间隔(index_granularity)。在新版本中增加了自适应间隔大小的特性,即根据每一批次写入数据的体量大小,动态划分间隔大小。而数据的体量大...
ClickHouse将数据划分为多个partition,每个partition再进一步划分为多个index granularity(索引粒度),然后通过多个CPU核心分别处理其中的一部分来实现并行数据处理。在这种设计下,单条Query就能利用整机所有CPU。极致的并行处理能力,极大的降低了查询延时 所以,ClickHouse即使对于大量数据的查询也能够化整为零平行处理。但是有一个...