Key Generation Transform In Sap Data Services Inc
Sap Data Services
Key Generation Transform In Sap Data Services Training

Jun 21, 2016 Got attracted towards the “KeyGeneration” transform and was fascinated at its features.Now it was time for me to fuse and adapt myself into its world. THE KEYGENERATION TRANSFORM:-This transform is categorized under the “Data Integrator Transforms”.
Jun 04, 2012 In this tutorial we will demonstrate how to implement Slowly Changing Dimension in SAP BusinessObjects Data Services using Table Comparison Transform. 006: TableComparison in Data Services.

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Keygeneration transform is creating negative key values Negative integers are being assigned via the keygeneration transform The largest keygeneration value is 2,147,483,647 SAP Knowledge Base Article - Preview.

Although the Key Generation Transform actually does execute a SQL I put it into the Streamline category because it executes one and only one SQL at the start of the transform and this is a 'select max(key) from table'. In almost all cases this key will be the primary key column which is indexed. So to find a max() the database has to walk to the last element in the key which is an operation done in no-time. Based on this starting value, the transform increases the value by one for each row with OP code Insert or Normal and puts the value into the 'Generated Key Column'.

Throughput	237'000 rows/sec
CPU	100%
Memory	none
Disk	none
DoP	singularization point

Transform Usage

Transform Settings

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To test it, we had to rename the column from DI_ROW_ID to KEY_ID which is the primary key name of another table.

The execution time for above flow without the key generation was 84 secs, so the overhead for the query is about 20 secs. The execution time with Key Generation Transform added as well was 422 seconds which is quite surprising.

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Anyway, no memory is consumed, only CPU and the throughput is still at excellent 237'000 rows per second.

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Job_Key_Generation_Transform.zip (4.98 KB)

Key generation transform in sap data services designer

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To delta load a table which has a surrogate key as primary key you simply combine Table Comparison with Key Generation Transform. Behind the scenes, some not so obvious things go on.

The flow itself is simple.

The secret is the Table Comparison Transform, that perform the lookup on the target table to get the current status. With this lookup, it can read and will output all the columns, even if they are not part of the input schema. An example is the surrogate key of the target table. The Table Comparison does get the logical primary key as input, tries to find the matching row in the comparison (target) table and if found, will get all the missing column values as well like the corresponding KEY_ID.

The only thing to watchout is, if using the row-by-row setting of the Transform, the compare table has to have an index on the logical(!!) primary key - CUSTOMER_ID in this example.

Now the Key Generation Transform gets insert and update rows but will overwrite the KEY_ID column only for rows with OP code of insert - rows that do not have a KEY_ID yet.

Key Generation Transform In Sap Data Services Inc

And at then end, the target table loader does execute the insert or the update statement. For the update statement, it needs to know what the physical primary key is, so make sure the target table got imported with primary key column(s) into the DI repo.

Transform Usage

Transform Settings

Key Generation Transform In Sap Data Services Inc

Sap Data Services

Key Generation Transform In Sap Data Services Training