KISSDB最简单的 key/value 存储

(Keep It) 简单愚蠢的数据库

KISSDB 是一个最简单的 key/value 存储，使用纯 C 开发，只适用标准字符串和 FILE IO 函数。

特性：

• Tiny, compiles to ~4k on an x86_64 Linux system
• Small memory footprint (only caches hash tables)
• Very space-efficient (on disk) if small hash tables are used
• Makes a decent effort to be robust on power loss
• Pretty respectably fast, especially given its simplicity
• 64-bit, file size limit is 2^64 bytes
• Ports to anything with a C compiler and stdlib/stdio
• Public domain

限制：

• Fixed-size keys and values, must recreate and copy to change any init size parameter
• Add/update only, no delete
• Iteration is supported but key order is undefined
• No search for subsets of keys/values
• No indexes
• No transactions
• No special recovery features if a database gets corrupted
• No built-in thread-safety (guard it with a mutex in MT code)
• No built-in caching of data (only hash tables are cached for lookup speed)
• No endian-awareness (currently), so big-endian DBs won't read on little-endian machines