How do you implement SCD Type 2 in ETL?

Next, we’ll want to create the tasks below to perform the SCD Type 2 ETL process:

  1. Create a stream on the landing table to capture the changed data.
  2. Create a task to truncate the source table before every load.
  3. Create a task to load the file to the source table.

How do you implement SCD Type 2 in informatica without lookup?

We can use SCD without using lookup.

  1. Mahendra Rajpoot. Answered On : Sep 17th, 2014.
  2. Yes it is possible. Use left outer join query between source and target table in SQ to achieve look up functionality. Send this output to EXPR and then RTR for condition check SCD 2. Then insert and update Target based on RTR conditions.

What are the different types of type2 dimension mapping?

There are three types of Type 2 Slowly Changing Dimensions:

  • Version Data Mapping. . The Type 2 Dimension/Version Data mapping filters source rows based on user-defined comparisons and inserts both new and changed dimensions into the target.
  • Flag Current Mapping. .
  • Effective Date Range Mapping. .

How would you implement SCD Type 2 in SQL query?

Merge statement to perform SCD Type 2

  1. Inserts the new address with its current set to true, and.
  2. Updates the previous current row to set current to false, and update the endDate from null to the effectiveDate from the source.

How do you validate SCD Type 2 in ETL Testing?

Testing Type 2 Slowly Changing Dimensions using ETL Validator

  1. Testing SCD Type 2 Dimensions.
  2. Test 1: Verifying the Current Data.
  3. Test 2: Verifying the uniqueness of the key columns in the SCD.
  4. Test 3: Verifying that historical data is preserved and new records are getting created.

What is SCD transformation in informatica?

The SCD type 1 method overwrites the old data with the new data in the dimension table. The process involved in the implementation of SCD Type 1 in informatica is. Identifying the new record and inserting it in to the dimension table. Identifying the changed record and updating the dimension table.

What is Type 2 mapping in Informatica?

The Type 2 Dimension/Version Data mapping filters source rows based on user-defined comparisons and inserts both new and changed dimensions into the target. Changes are tracked in the target table by versioning the primary key and creating a version number for each dimension in the table.

What is SCD type2?

Type 2 SCDs – Creating another dimension record. A Type 2 SCD retains the full history of values. When the value of a chosen attribute changes, the current record is closed. A new record is created with the changed data values and this new record becomes the current record.

What is the difference between connected and UnConnected lookup in informatica?

Connected lookup receives input values directly from mapping pipeline, whereas UnConnected lookup receives values from the lookup expression from another transformation. A mapping in Informatica may contain Source, Transformations and Targets connected together are considered as a pipeline.

What is dynamic lookup informatica?

Use a dynamic lookup cache to keep the lookup cache synchronized with the target. When you enable lookup caching, a. mapping. task builds the lookup cache when it processes the first lookup request.