Principles of BASE.

BASE is a set of principles used in distributed systems, especially in NoSQL databases, as an alternative to strict ACID consistency. BASE stands for:

• Basically Available: the system guarantees data availability even if part of the system is unavailable.
• Soft state: the state of the system can change over time, even without new input data, due to asynchronous replication.
• Eventual consistency: the system guarantees that eventually all copies of the data will become consistent.

Example: in a distributed database, a record may be unavailable on one node, but the system still responds, and the data is synchronized later.