数据仓库建模对比： 比较表格和多维解决方案 (Comparing tabular and multidimensional solutions)

笔记记下来，划重点:

https://docs.microsoft.com/zh-cn/sql/analysis-services/comparing-tabular-and-multidimensional-solutions-ssas?view=sql-server-2017

Model Features

	Multidimensional	Tabular
Actions	Yes	No
Aggregations	Yes	No
Calculated Column	No	Yes
Calculated Measures	Yes	Yes
Calculated Tables	No	Yes1
Custom Assemblies	Yes	No
Custom Rollups	Yes	No
Default Member	Yes	No
Display folders	Yes	Yes1
Distinct Count	Yes	Yes (via DAX)
Drillthrough	Yes	Yes (depends on client application)
Hierarchies	Yes	Yes
KPIs	Yes	Yes
Linked objects	Yes	Yes (linked tables)
M expressions	No	Yes1
Many-to-many relationships	Yes	No (but there is bi-directional cross filters at 1200 and higher compatibility levels)
Named sets	Yes	No
Ragged Hierarchies	Yes	Yes1
Parent-child Hierarchies	Yes	Yes (via DAX)
Partitions	Yes	Yes
Perspectives	Yes	Yes
Row-level Security	Yes	Yes
Object-level Security	Yes	Yes1
Semi-additive Measures	Yes	Yes
Translations	Yes	Yes
User-defined Hierarchies	Yes	Yes
Writeback	Yes	No

Data Considerations

Compression

...multidimensional database will be about one third size of the original data. Tabular databases can sometimes get greater amounts of compression, about one tenth the size, especially if most of the data is imported from fact tables.

Size of the model and resource bias (in-memory or disk)

Historically, the largest databases in production are multidimensional, with processing and query workloads running independently on dedicated hardware, each one optimized for its respective use. Tabular databases are catching up quickly, and new advancements in DirectQuery will help close the gap even further.

Security Features

• Tabular model databases can use row-level security, using role-based permissions.

• Multidimensional model databases can use dimension and cell-level security, using role-based permissions.

多说一句，总的来说：

多维（multidimensional) ：强大，功能多一些，难用，开发周期长，需要开发人员的技能高些（建模、MDX），靠近程序猿；

表格(tabular)：易用，适合快速开发，靠近Excel 用户，适合微软现在的发展思路，line up with PowerBI等产品线

Tabular