So all the data from the left one exist in the right one with lower granularity. Although in theory Inner Join is faster than Left Outer Join, in this scenario it seems that Left Outer Join is faster after my performance analysis in both RSRT and Visualize plan in HANA Studio.
Keeping this in consideration, what is optimize join in Hana?
Relevance of optimize join columns flag In situations with many join partners on different join fields and in which queries typically only select fields from a small subset of join partners using the optimize join columns flag allows omitting various join fields from the aggregation.
Furthermore, how do you improve performance in calculating views? as do not know your data model in detail, here are some basic tips: Filter the data at the base models and try to reduce the data set to what is really needed. push the custom calculation to the top most nodes as possible. Apply optimize join and cardinality in each join.
Additionally, how does Hana views improve performance?
Always follow – HANA Development Points
- Use left outer joins maximum.
- Specify cardinality in joins (n:1 or 1:1) – only if sure.
- Set optimize join = true (only if cardinality is set like above)
- Use table functions instead of scripted calculation views.
- Execute in SQL-engine (for HANA live)
What is join pruning in Hana?
Join pruning is a process where SAP HANA eliminates both tables and joins from its execution plan based how the joins are defined in the information view and how data is queried from the information view.
12 Related Question Answers Found
What is text join in Hana?
TEXT JOIN in SAP HANA. Text Join is used in order to get language-specific data. Text Join is used to fetch the description based on user’s session language. Once we implement the text join in SAP HANA, it automatically finds out user’s language and gives a description in that language.
What is dynamic join in Hana?
Dynamic Joins. Send feedback. After creating a join between two data sources, you can define the join property as dynamic. Dynamic joins helps improve the join execution process by reducing the number of records processed by the join view node at runtime. Dynamic joins are special type of joins.
What is referential join in SAP HANA?
Referential joins in SAP HANA are used whenever there is a primary key and foreign key association between two tables. And, referential integrity is when for every value in the foreign key column, there is a reference value in the primary key column of the master data table.
What is cardinality in SAP HANA?
SAP HANA features like Calculation Views and CDS allow to specify the cardinality for joins to improve the performance of the execution. The cardinality specifies the number of rows which are matching another table if these tables are joined. With SPS04, this feature is also possible in plain SQL.
What is temporal join in SAP HANA?
A temporal join lets you set time intervals for which you want to fetch records. It indicates the time interval mapping between the master data and the transaction data. The temporal join is based on the date field from the fact table and the time interval (to and from fields) from the master data view.
What is star join in Hana?
Star joins are a new option in your SAP HANA modeling tool chest. They overcome the constraints that limit your options when modeling complex analytical views with measures from more than one table.
What is Information View in SAP HANA?
SAP HANA Modelling is an activity by which we create information view. Information View is similar to dimension, cube or information provider of BW. This information view is used for creating the multi-dimensional data model.
What is a Hana calculation view?
SAP HANA Calculation view is a powerful information view. Calculation view supports complex calculation. The data foundation of the calculation view can include tables, column views, analytic views and calculation views. We can create Joins, Unions, Aggregation, and Projections on data sources.
How do you consume a model in Hana?
Consuming SAP HANA Models in SAP BW – Virtual Provider. To create a virtual provider based on HANA Model, run the transaction RSA1, and then In Modeling select InfoProvider and then Create Virtual InfoProvider-> select based on HANA Model as shown below. Now select package and HANA Model that we want to consume in BW.
What is aggregation in SAP HANA?
Aggregation node in SAP HANA Calculation View. An aggregation node is usually attached to the semantics node by default if you are building a transaction calculation view(This means that the data category CUBE was selected when initially creating the view). Additional aggregation nodes can be added if required.
What is the use of calculation view in SAP HANA?
Calculation Views are used to consume Analytic, Attribute and other Calculation Views. They are used to perform complex calculations, which are not possible with other Views. There are two ways to create Calculation Views- SQL Editor or Graphical Editor. Built-in Union, Join, Projection & Aggregation nodes.
How do I copy a formula view in SAP HANA?
v Choose the Copy From option when there is a need to create a new calculation view that is a copy of an existing calculation view. v Select the Browse button to select an existing calculation view. All content from the source calculation view is copied into the new view.