嵌入式K/V数据处理库-LevelDB
2013-05-24 15:53:27 
阿炯
LevelDB 是一个由Google公司所研发的键/值对(Key/Value Pair)嵌入式数据库管理系统编程库，采用C++开发并在BSD许可协议下授权使用。
LevelDB is a fast key-value storage engine written at Google that provides an ordered mapping from string keys to string values. We are pleased to announce that we are open sourcing LevelDB under a BSD-style license.
We structured LevelDB to have very few dependencies and it can be easily ported to new systems; it has already been ported to a variety of Unix based systems, Mac OS X, Windows, and Android.
特点
高性能
简单的体系结构：只支持API调用，不支持SQL语言
自由软件和开放源代码软件
数据支持被Snappy函式库压缩，以减少Disk I/O提升效能
Features
Keys and values are arbitrary byte arrays.
Data is stored sorted by key.
Callers can provide a custom comparison function to override the sort order.
The basic operations are Put(key,value), Get(key), Delete(key).
Multiple changes can be made in one atomic batch.
Users can create a transient snapshot to get a consistent view of data.
Forward and backward iteration is supported over the data.
Data is automatically compressed using the Snappy compression library.
External activity (file system operations etc.) is relayed through a virtual interface so users can customize the operating system interactions.
Detailed documentation about how to use the library is included with the source code.
其文档里有其与SQLite3、Kyoto Cabinet相对比的详细结果。
注意：
This is not a SQL database. It does not have a relational data model, it does not support SQL queries, and it has no support for indexes.
Only a single process (possibly multi-threaded) can access a particular database at a time.
There is no client-server support builtin to the library. An application that needs such support will have to wrap their own server around the library.
最新版本：1.10
项目主页：https://code.google.com/p/leveldb/
LevelDB is a fast key-value storage engine written at Google that provides an ordered mapping from string keys to string values. We are pleased to announce that we are open sourcing LevelDB under a BSD-style license.
We structured LevelDB to have very few dependencies and it can be easily ported to new systems; it has already been ported to a variety of Unix based systems, Mac OS X, Windows, and Android.
特点
高性能
简单的体系结构：只支持API调用，不支持SQL语言
自由软件和开放源代码软件
数据支持被Snappy函式库压缩，以减少Disk I/O提升效能
Features
Keys and values are arbitrary byte arrays.
Data is stored sorted by key.
Callers can provide a custom comparison function to override the sort order.
The basic operations are Put(key,value), Get(key), Delete(key).
Multiple changes can be made in one atomic batch.
Users can create a transient snapshot to get a consistent view of data.
Forward and backward iteration is supported over the data.
Data is automatically compressed using the Snappy compression library.
External activity (file system operations etc.) is relayed through a virtual interface so users can customize the operating system interactions.
Detailed documentation about how to use the library is included with the source code.
其文档里有其与SQLite3、Kyoto Cabinet相对比的详细结果。
注意：
This is not a SQL database. It does not have a relational data model, it does not support SQL queries, and it has no support for indexes.
Only a single process (possibly multi-threaded) can access a particular database at a time.
There is no client-server support builtin to the library. An application that needs such support will have to wrap their own server around the library.
最新版本：1.10
项目主页：https://code.google.com/p/leveldb/