Consistency (Data)

Definition: The state in which all instances of data across different databases or within a distributed system are identical at any given time. Data consistency ensures that data is accurate and up-to-date everywhere.

Key Features:

  • Integrity: Data remains unchanged unless a change is required.

  • Reliability: Data always reflects the current and correct state.

  • Synchronicity: In distributed systems, data updates are carried out simultaneously across all parts of the system.

Common Challenges:

  • Network Failures: Can lead to inconsistencies in distributed databases.

  • Concurrent Access: Multiple users or processes accessing and modifying data at the same time can cause inconsistencies.

  • System Failures: Unforeseen errors can compromise data integrity.

Applications: Database management systems, distributed systems, cloud computing, and any application where data is stored and retrieved.