# schema migration

> management of incremental, reversible changes to database schemas

**Wikidata**: [Q7431119](https://www.wikidata.org/wiki/Q7431119)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Schema_migration)  
**Source**: https://4ort.xyz/entity/schema-migration

## Summary
Schema migration is the management of incremental, reversible changes to database schemas. This process is focused on evolving the structure of a database over time in a controlled manner.

## Key Facts
*   Schema migration manages incremental, reversible changes to database schemas.
*   It is also known by the aliases database migration and database change management.
*   Schema migration is a subclass of change management, data management, modification, and database administration.
*   It is explicitly different from data migration.
*   The primary use of schema migration is for schema evolution.
*   It is a facet of the database schema itself.
*   The class of objects of occurrence for schema migration is the database schema.
*   It is considered a part of data management, database administration, and modding.
*   A Wikipedia article exists under the title "Schema migration" in English, Farsi, and Ukrainian.

## FAQs
### Q: What is schema migration?
A: Schema migration involves the management of incremental, reversible changes applied to database schemas. Its primary purpose is to facilitate the evolution of a database's structure over time.

### Q: What are other names for schema migration?
A: Schema migration is also known by the aliases database migration and database change management.

### Q: How does schema migration differ from data migration?
A: Schema migration is distinct from data migration. While schema migration focuses on changes to the database structure, data migration typically refers to moving actual data.

### Q: What broader categories does schema migration belong to?
A: Schema migration is classified as a subclass of change management, data management, modification, and database administration. It is also considered a facet of database schema.

### Q: What is the primary use of schema migration?
A: The primary use of schema migration is for schema evolution, enabling the structured and controlled development of database designs.

## Why It Matters
Schema migration is critical for the lifecycle management of databases in modern software development. It provides a structured and controlled approach to evolving database schemas, which are the foundational blueprints for data storage. By managing incremental and reversible changes, schema migration ensures that database structures can adapt to new requirements without causing data loss or application downtime. This systematic management prevents chaotic, error-prone, or irreversible modifications, thereby safeguarding data integrity and system stability. It is an essential practice within data management and database administration, enabling continuous development and deployment of applications that rely on dynamic data models. Its focus on controlled evolution allows organizations to maintain robust and adaptable data resources.

## Notable For
*   Its specific focus on the *management of incremental, reversible changes* to database schemas, rather than the data itself.
*   Being explicitly `different_from` data migration, which typically involves moving actual data.
*   Its application in facilitating `schema evolution`, allowing database structures to adapt over time.
*   Its classification as a `subclass_of` change management, highlighting its structured approach to modifications.

## Body

### Definition and Scope
Schema migration is defined as the management of incremental, reversible changes to database schemas. This process is central to the evolution of database structures. The class of objects of occurrence for schema migration is the database schema.

### Terminology
Schema migration is also known by the aliases "database migration" and "database change management."

### Classification and Relationships
Schema migration is classified as a subclass of change management, data management, modification, and database administration. It is considered a facet of the database schema itself. It is also identified as a part of data management, database administration, and modding.

### Distinctions
Schema migration is distinct from data migration. While schema migration focuses on altering the structure of a database, data migration typically involves the movement of data content.

### External References and Identifiers
*   Wikipedia Title: Schema migration
*   Wikipedia Languages: English (en), Farsi (fa), Ukrainian (uk)
*   Stack Exchange Tag: https://stackoverflow.com/tags/database-migration
*   Freebase ID: /m/0j3gs4m
*   Microsoft Academic ID (discontinued): 153440673
*   Sitelink Count: 3
*   Wikidata Description: management of incremental, reversible changes to database schemas

## References

1. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)