In memory computing of sap Hana
The 3 replication method of sap hana
1.Trigger base replication method
2.ETL based replication
3.Log based replication
Using SAP Landscape Transformation (LT) Replication Server is based on capturing database changes at a high level of abstraction in the source ERP systemTrigThis method of replication benefits from being database-independent, and can also parallelize database changes on multiple tables or by segmenting large table changes
ETL-based replication: Employs an Extract, Transform, and Load (ETL) process to extract data from the data source; transform it to meet the business or technical needs, and then load it into the SAP HANA database.
ETL based data replication uses SAP Business Objects Data Services(referred to as Data Services from now on) to load the relevant business data from the source system , SAP ERP, and replicate it to the target, SAP HANA database .
This method enables you to read the required business data on the level of the application layer.
Transaction Log-Based Data Replication Using Sybase Replication is based on capturing table
changes from low-level database log files. This method is database-dependent
Data Flow for Initial Load and Update
Both the initial load of business data from the source system into SAP HANA database as well as
updating the replicated data (delta handling) is done using SAP BusinessObjects Data Services.
The initial load can be set up modeling a simple data flow from source to target.
For the update, in most cases, the data flow is enhanced by a delta handling element, such as Map_CDC_Operation or Table_Comparison Transform