Append Only Databases
Append only databases are a type of database system where data is never modified or deleted once written; instead, new data is appended as immutable records. This design ensures data integrity, provides a complete audit trail, and simplifies replication and backup processes. They are commonly used in scenarios requiring high reliability, such as financial transactions, logging systems, and event sourcing architectures.
Developers should learn and use append only databases when building applications that require strong data consistency, auditability, and fault tolerance, such as in banking systems, blockchain implementations, or compliance-heavy industries. They are ideal for use cases like event sourcing, where maintaining a full history of changes is critical, or in distributed systems where immutable data simplifies synchronization and reduces conflicts.