Data quality problem and solution

1. Data quality problem and
solution

2. META DATABASE
• Meta database is a database model for
• (1) metadata management,
• (2) global query of independent databases, and
• (3) distributed data processing.
The word meta database is an addition to the dictionary.
https://en.wikipedia.org/wiki/Metadatabase

3. META DATABASE

4. META DATABASE

5. Federated database
• A federated database system is a type of meta-database
management system
• transparently maps multiple autonomous database systems into a
single federated database
https://en.wikipedia.org/wiki/Federated_database_system

6. .
https://www.google.com/search?q=federated+database+system&biw=1366&bih=662&tbm=isch&source=lnms&
sa=X&ved=0ahUKEwi-vfb9xebRAhUHgI8KHe7mA-QQ_AUIBigB#imgrc=hc6HGPBn16MkEM%3A

7. DATA QUALITY PROBLEMS

8. SINGLE-SOURCE PROBLES AT SCHEMA LEVEL

9. SINGLE-SOURCE PROBLEMS AT INSTANCE LEVEL

10. MULTI-SOURCE PROBLEMS AT SCHEMA AND INSTANCE LEVEL

11. METADATA DETECING DATA QUALITY PROBLEM

12. DEFINING DATA TRANSFORMATION

13. ETL PROCESS