zdbm is a persistent, scalable, distributed, consistent key/value store.
Features:
Unlimited database size via automatic partitioning Fast, always-available primary-key lookups Efficient
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prefix-based iteration or lookups Consistent single-item writes using two-phase commits Safe writes using compare-and-set Global cluster consistency across all partitions Asynchronous replication to read-only replicas Persistent writes across entire cluster crashes No single points of failure [Less]