database - 是否有类似 Redis DB 的东西，但不受 RAM 大小的限制？

Question

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Answer 1

是的，有两种 Redis 的替代方案，它们不受 RAM 大小的限制，同时保持与 Redis 协议(protocol)兼容:

Ardb (C++)，复制(主-从/主-主):https://github.com/yinqiwen/ardb

A redis-protocol compatible persistent storage server, support LevelDB/KyotoCabinet/LMDB as storage engine.

Edis(二郎):https://github.com/cbd/edis

Edis is a protocol-compatible Server replacement for Redis, written in Erlang. Edis's goal is to be a drop-in replacement for Redis when persistence is more important than holding the dataset in-memory. Edis (currently) uses Google's leveldb as a backend.

为了完整起见，这里还有另一个数据结构数据库:

Hyperdex(字符串、整数、 float 、列表、集合、映射):http://hyperdex.org/doc/latest/DataTypes/#chap:data-types

HyperDex is:

• Fast: HyperDex has lower latency, higher throughput, and lower variance than other key-value stores.
• Scalable: HyperDex scales as more machines are added to the system.
• Consistent: HyperDex guarantees linearizability for key-based operations. Thus, a read always returns the latest value inserted into the system. Not just “eventually,” but immediately and always.
• Fault Tolerant: HyperDex automatically replicates data on multiple machines so that concurrent failures, up to an application-determined limit, will not cause data loss. Searchable:
• HyperDex enables efficient lookups of secondary data attributes.
• Easy-to-Use: HyperDex provides APIs for a variety of scripting and native languages.
• Self-Maintaining: A HyperDex is self-maintaining and requires little user maintenance.