英文:
What is the difference between materialized view in clickhouse and postgres
问题
我是新手使用ClickHouse,并尝试使用它的物化视图功能。然而,看起来ClickHouse的物化视图与PostgreSQL的物化视图存在显著差异。
英文:
I'm new to Clickhouse, and I was trying to use its materialized view feature. However, it seems that there are significant differences between Clickhouse's and Postgres' materialized views.
答案1
得分: 1
是的,ClickHouse和Postgres的物化视图之间存在一些差异。
一个显著的差异是,ClickHouse的物化视图是增量刷新的,而Postgres的物化视图是完全刷新的。在ClickHouse中,当创建物化视图时,它从空数据集开始,并随着新数据插入源表时逐渐添加数据。相比之下,Postgres的物化视图在刷新时总是使用源表在刷新时刻的整个数据集。
另一个差异是,ClickHouse的物化视图可以使用任意查询创建,而Postgres的物化视图必须使用SELECT语句创建。这意味着ClickHouse的物化视图可以包括子查询、连接和其他更复杂的结构,而Postgres的物化视图在功能上更有限。
最后,ClickHouse的物化视图可以用于分布式处理,这有助于提高大规模系统的性能。Postgres的物化视图在处理分布式数据时功能较为有限。
总的来说,虽然ClickHouse的物化视图和Postgres的物化视图之间存在一些相似之处,但在功能和用法方面也存在显著差异。在选择使用哪个系统时,需要仔细考虑您特定用例的要求。
英文:
Yes, there are some differences between ClickHouse's and Postgres' materialized views.
One significant difference is that ClickHouse's materialized views are refreshed incrementally, while Postgres' materialized views are refreshed completely. In ClickHouse, when a materialized view is created, it starts with an empty dataset, and data is incrementally added to it as new data is inserted into the source table. In contrast, Postgres' materialized views are always populated with the entire data set of the source table at the time of the refresh.
Another difference is that ClickHouse's materialized views can be created with an arbitrary query, while Postgres' materialized views must be created with a SELECT statement. This means that ClickHouse's materialized views can include subqueries, joins, and other more complex constructs, while Postgres' materialized views are more limited in their functionality.
Finally, ClickHouse's materialized views can be used for distributed processing, which can help to improve performance in large-scale systems. Postgres' materialized views are more limited in their ability to handle distributed data processing.
Overall, while there are some similarities between ClickHouse's and Postgres' materialized views, there are also significant differences in their functionality and usage. It's important to carefully consider the requirements of your particular use case when choosing which system to use.
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