This document presents step by step procedure for Trigger-Based Data Replication from ECC to HANA system using SAP Landscape Transformation (SLT) based on capturing database changes at a high level of abstraction in the source ERP system.
Initial Load and Simultaneous Delta Replication
The initial load of business data is initiated using the SAP HANA studio. The initial load message is sent from the SAP HANA system to the SLT system (based on SAP NetWeaver 7.02 with kernel 7.20 EXT), which in turn passes the initialization message to the ERP system. The ERP system begins by setting up database transaction log tables for each table to be replicated. After the transaction tables are completed, the SLT system begins a multi-threaded replication of data to the target system, which enables high speed data transfer.
The initial load of data can be executed while the source system is active. The system load that this process causes can be controlled by adjusting the number of worker threads performing the initial replication.
In parallel to the initial load, by means of database-specific triggers, the SLT system begins detecting any data changes that occur while the initial load process is running. These changes are logged to the transaction tables, and are propagated to the target SAP HANA system.
Continuous Delta Replication after Initial Load
After the initial load process has completed, the SLT system continues to monitor the transaction tables in the ERP system, and replicates data changes in the source system to the SAP HANA system in near real time.
Step by Step Procedure for Replication:
- Logon to SAP LT system and create a new configuration.
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Enter a distinct configuration name (A schema of same name would be created in HANA system), Initial load mode as resource optimized, appropriate RFC Connection (ECC <--> LT), Data Transfer and calculation jobs. Replication would be Real time. Also mention the target HANA system credentials and click on Ok.
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2. Logon to HANA Studio with the appropriate credentials . Here a schema of same name as configuration would be created.
Click on Data Provisioning through Quick Launch.
This will take take us to SLT Based Table Data Provisioning. Here we can see 3 tables are already being replicated without user replicating them. These tables basically provide HANA system with information of all the tables in source system.
Now for loading any table click on “Load” and select the table from the list of tables available in the source system and click finish.
Lets first take an example of loading Material master table - MARA
The loading is scheduled and once completed status is set as executed.
With this, table “MARA” get loaded from Source ECC system to SAP HANA system.
For replication purpose lets take example of application table –VBAP (Sales Document line item data).
Click on “Replication” button and select VBAP table.
This will load the VBAP table and then set the status “In process” for replicating changes in the VBAP table in source system.
To show the replication process lets create one more record on the ECC side (with reference) which gets replicated to the HANA system as shown below:
Now a Sales Document with Document number (VBELN) – 13553 is created.
The same document would be replicated to HANA system in real time.
This completes our basic objective of replicating data from SAP ECC system to SAP HANA system in real time using SLT.