Quelle est l’importance de l’analyse de la traçabilité des données pour la qualité des données ?

In my experience, most important aspect of data lineage analysis is to track and understand the complete journey of data within an organization, from its source to its destination, including all the transformations and varied processes it undergoes. There can be multiple departments using the same datasets redundantly. So understanding the full landscape is very helpful before digging deep for analytics. This helps ensure data quality, compliance, and provides transparency for decision-making and troubleshooting in data-driven environments. In nutshell, data lineage analysis is understanding the depth of rot before you conduct any surgical procedure.

In my opinion, data lineage analysis is crucial for ensuring data quality. It provides a detailed record of a data's origin, transformations, and movements, allowing organizations to trace errors and inconsistencies. This transparency aids in data validation, troubleshooting, and compliance, ultimately enhancing the reliability and trustworthiness of data, which is vital for making informed decisions and maintaining data integrity.

Often, the same data flows through multiple staging areas on its way to the final destination. With good data lineage practices, you can monitor the data through all steps of its journey, and you can conduct root cause analysis on the ultimate source data.

Data lineage is critical in today's world where self-service and data democratization are inevitable. It helps to handle below major areas: - Analysis of Data Origin through its life - Improved data quality by enabling effective validation strategy - Promotes self-service - Helps in effectively handling change management in SDLC during maintenance and production support activities - Improves Data accuracy and reliability

It has been observed similar data flows across many applications which has been created across years not identifying or knowing the golden sources hence creating opportunities for data leakages. Data Lineage analysis is one of important process for tracing the data flows documenting System of Origin, System of Records and Authoritative data source, while you document metadata, dependencies, data owners and impacts with each data element. This process gives confidence to organisation understanding what data they own, how it is being managed and who owns, ultimately enhancing and ensuring better data quality management.

Data lineage is not just a technical term; it's the backbone of responsible data sharing. Imagine it as a detailed map that guides you through the journey of your data through below enablers, 👉 Provenance Understanding: Data lineage tells you exactly where your data originated and where it's headed. It's like knowing the birthplace and current location of a cherished management report. 👉 Quality Assessment: Provides a lens to assess data quality and consistency, helping you understand not only the data's history but also its present condition 👉 Context Clarity: It's not just about the data; it's also about the story behind it. Data lineage provides essential context for those handling the quality of your data

Data lineage plays a crucial role in maintaining and improving the quality of data in data management. 1. Organizations can trace the origins of data quality issues by using data lineage. 2. When data quality issues arise, data lineage makes it easier to perform root cause analysis. 3. Data lineage helps organizations assess the potential impact of changes in data sources or processes. 4. Data lineage provides a clear audit trail, helping organizations demonstrate compliance with privacy laws by showing how data is sourced, transformed, and used.

Baking a cake is a frequent analogy we employ in our presentations! Here's another one: In the data management world, think of data lineage like the process of baking a cake. When you begin baking, you begin with a recipe (similar to raw data), meticulously noting each ingredient and step. Similarly, data lineage carefully traces the origins (raw data), transformations (mixing, baking), and the ultimate result (processed data). Just as a well-baked cake's outcome is tied to the quality of its ingredients and adherence to the recipe, data quality (DQ) relies on the precision of its source and transformations.

The bain of most data analysts existence is the question: "where does that number come from". Often times you're dealing with data that comes from a source system, goes through a cleansing layer, gets enriched with third party data, gets Staged in a data bridge or data lake, gets converted in some way before making it's way to a data warehouse, gets aggregated into a view or a fact table, and then is blended with other data, that follows a similar path, in order to produce a KPI. Without proper documentation of business rules, or lineage mapped out, a key man leaving your organization can make it impossible to re create a KPI from one report to another. Reverse engineering a KPI is akin to pulling teeth.

Data lineage analysis directly helps the data quality in building Integrity and consistency business rules. The lineage shows the data flowing and connecting of systems. Integrity checks between systems help identify the broken relationships. Consistency business rules checks for inconsistencies and misrepresentations of codes and other key values. Thus data lineage analysis helps the data quality. It can also check for conformity of data elements across systems.

Certain tools like dbt and Apache Spark can generate Directed Acyclic Graphs (DAG) that represents data lineage as a flow diagram of each transformation. Tools like this show how the data is connected and can give insights to help optimize the flow of data. In my own experience with DAGs, I’ve found that they can demonstrate test changes before they are pushed to production, save time when debugging, and they help with onboarding new team members and providing clarity to stakeholders about data requests.

If the data environment is small in size, manual analysis would be applicable. The tools can be handy if the data environment is large. The tools can be used to connect multiple systems to collect metadata and identify lineage. Advantage in using tools is, it can be automated.

Data Linage gives abstract view of data flow end to end. In Multi-system involvement, its most useful to gain full view. In Data Quality context, Data Linage tool provides ability to verify data rules and highlight non-adherence. Data Linage should be done by automation as much as possible if you have right 'Connectors' are available. This leaves manual intervention aside and takes Data Linage more trust worthy. Data Linage analysis must be an on-going effort to validate current position of metadata, end to end flow & Business Rules. Business involvement makes is much useful as SME knowledge can be brought into Data Linage. It helps reduce dependency on few key people who know it end to end.

Business units working in silos, making their own architectural decisions, non-existing data architecture teams and undocumented systems are some of the challenges while doing data lineage analysis. Multiple vendor environment and Missing of established standards will also form great challenges for the analysis of data lineage.

Due to complex Distributed Systems In modern architectures like microservices and cloud computing, data may traverse multiple distributed systems, making lineage analysis more challenging. -Lack of Documentation: Incomplete or outdated documentation can hinder lineage analysis, as it relies on accurate metadata and data source information. -Schema Evolution: Changes in data schemas over time can disrupt lineage tracking, requiring constant updates. Addressing these challenges often requires a combination of technology, process improvements, and skilled personnel to ensure accurate and actionable data lineage insights aligning business models.

One of the biggest challenges we face is scale. As we produce, consume and transform more and more data, our approach to managing data lineage analysis should allow for that. One way to combat that is through decentralisation. Federating the responsibilities and making sure that people on the ground who are producing, consuming and transforming the data 1) Understand the importance of data lineage analysis and 2) Are responsible for ensuring correct and consistent data lineage is captured.

Like most things in data management, data lineage should be done pre-production. If you don't understand your data lineage, how did you effectively test the data before the application went into production? You need to know the movement of the data and any transformations it went through to be able to say that it is accurate and ready for production. Once you have it, it can help in identifying where data quality issues occurred in the data flow.

Data lineage analysis is key to understanding data origins, ensuring data quality, and complying with regulations. By tracking and documenting the flow and transformation of data throughout a system or process, organizations can establish a robust data lineage analysis process that supports data management, enhances data quality, and facilitates compliance with regulatory requirements.

Establishing standards and validation of standards on data elements can be best practices. On-boarding vendor systems should strictly meet organizational standards. If the organization has an established roles like data owners, stewards and custodians should be educated how to monitor the lineage. A regular validation should be done, at the least, by data architecture team would help.

-By identifying redundant or unnecessary data transformations and processes, data lineage can lead to process optimization and cost savings. -Data lineage documentation serves as a valuable reference for data professionals and business stakeholders providing a visual representation of how data moves from source to end. -During data migration or system modernization programs, DL helps ensure a smooth transition by providing insights into how data is currently utilized, mapping data to new systems and validating migration outcomes.

Understanding data lifecycle is crucial for identifying potential security risks and vulnerabilities in data handling processes. It helps any organizations implement appropriate security measures to protect sensitive data, establishing clear accountability for data defining data ownership, stewardship, and access controls, ensuring that data is managed and used responsibly within enterprise.