# Master data management

> Keeping one agreed, trusted version of a company's core records across all its systems.

- Level: Advanced
- Topics: Data
- URL: https://tidbit.legios.com.ar/master-data-management/
- In Spanish: [Gestión de datos maestros](https://tidbit.legios.com.ar/es/master-data-management/)

**Master data** is the core information a business runs on and reuses everywhere: customers, products, suppliers, employees, locations. Not the daily transactions, but the things those transactions are about. **Master data management**, or MDM, is the set of processes and tools that keeps one consistent version of each of those records across every system.

The problem it solves is familiar to anyone in a large company. The CRM has "Ana Gómez, ana@mail.com", billing has "A. Gomez" with an old address, and the web shop has her twice under two emails. Reports disagree on how many customers there are, and a letter goes to the wrong house. An MDM tool collects these versions, **matches** records that are probably the same entity, **merges** them using rules about which source to trust for each field, and publishes the result, often called the **golden record**, back to the other systems.

Software is only half of it. Someone has to decide what counts as one customer, which system owns the address, and who fixes conflicts; those people are often called **data stewards**, and the rules are part of data governance. Products such as Informatica MDM and SAP Master Data Governance are common, but many MDM efforts fail for organizational reasons rather than technical ones.

## An analogy

Like a family deciding there is one official contact list on the fridge: whoever learns that a cousin moved updates that list, and everyone copies from it instead of keeping their own scraps of paper.

## Keep in mind

- Master data: core entities like customers, products and suppliers, not transactions.
- MDM matches and merges duplicate records into one golden record.
- Survivorship rules decide which source wins for each field.
- Needs clear ownership and data stewards, not just software.

## Go deeper

- [Master data management on Wikipedia](https://en.wikipedia.org/wiki/Master_data_management)
- [What is master data management? (IBM)](https://www.ibm.com/think/topics/master-data-management)

## Related terms

- [Data governance](https://tidbit.legios.com.ar/data-governance/): The rules and roles that decide who owns data, who can use it and how it is kept right.
- [SAP](https://tidbit.legios.com.ar/sap/): The German company whose software runs the back office of many large businesses.
- [Deduplication](https://tidbit.legios.com.ar/deduplication/): Finding the copies of the same thing and keeping just one.