Asked by: Feliciana El Haddaoui
asked in category: General Last Updated: 9th January, 2020

What is SCD in hive?

Impala or Hive Slowly Changing Dimension – SCD Type 2 Implementation. Last Updated on August 28, 2018 by Vithal S. Slowly changing dimensions in Data warehouse are commonly known as SCD, usually captures the data that changes slowly but unpredictably, rather than regular bases.

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Then, what is CDC in hive?

Striim's MySQL CDC to Hive solution delivers that data in real time directly to Apache Hive to allow users to take advantage of Hive's data query and analysis capabilities on Hadoop. There is an alternative: change data capture (CDC).

Also, what is SCD in data warehouse? A Slowly Changing Dimension (SCD) is a dimension that stores and manages both current and historical data over time in a data warehouse. It is considered and implemented as one of the most critical ETL tasks in tracking the history of dimension records. In a Type 1 SCD the new data overwrites the existing data.

Moreover, how do you handle slowly changing dimensions in Hadoop?

In data warehousing, slowly-changing dimensions (SCDs) capture data that changes at irregular and unpredictable intervals.

Managing Slowly Changing Dimensions

  1. Type 1: Overwrite old data with new data.
  2. Type 2: Add new rows with version history.
  3. Type 3: Add new rows and manage limited version history.

What is CDC tool?

In databases, change data capture (CDC) is a set of software design patterns used to determine (and track) the data that has changed so that action can be taken using the changed data.

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