�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20122;&#27954;&#19968;&#21306;&#20108;&#21306;&#19977;&#21306;&#29245;&#29245;&#29245;&#29245;&#29245;&#44;&#20013;&#25991;&#23383;&#24149;&#20813;&#36153;&#19968;&#21306;&#44;&#20037;&#20037;&#25104;&#20154;&#31934;&#21697;&#35270;&#39057;</title><link>http://www.aygfsteel.com/waterjava/category/48084.html</link><description>闻道有先后，术业有专攻！</description><language>zh-cn</language><lastBuildDate>Thu, 17 Mar 2011 02:51:10 GMT</lastBuildDate><pubDate>Thu, 17 Mar 2011 02:51:10 GMT</pubDate><ttl>60</ttl><item><title>2010�q?0大热门的开源NoSQL服务器��Y�?/title><link>http://www.aygfsteel.com/waterjava/archive/2011/03/17/346450.html</link><dc:creator>狼爱上狸</dc:creator><author>狼爱上狸</author><pubDate>Thu, 17 Mar 2011 02:07:00 GMT</pubDate><guid>http://www.aygfsteel.com/waterjava/archive/2011/03/17/346450.html</guid><wfw:comment>http://www.aygfsteel.com/waterjava/comments/346450.html</wfw:comment><comments>http://www.aygfsteel.com/waterjava/archive/2011/03/17/346450.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/waterjava/comments/commentRss/346450.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/waterjava/services/trackbacks/346450.html</trackback:ping><description><![CDATA[<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">NoSQL�Q�就是反SQL�Q�是一��全新的数据库革新运动，特别是在 2010 �q�得以迅猛发展。而各�U�开源的 NoSQL 软�g�H�然间涌现在你面前。目前似乎没有对 NoSQL �l�出一个标准的定义�Q�也没有相应的规范，但从�q�些软�g可以看出 NoSQL 软�g的共同点�Q�独立运行、K/V存储�l�构�Q�这之前有�h�U�C��为集中式�~�存服务�Q�其实你可以把二者等同�v来�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">那么多的 NoSQL 软�g�Q�到底哪些更受欢�q�呢�Q��ؓ此，开源中国社��Zؓ你评选出10��?010�q�最受关注的 NoSQL 软�g�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">1. Cassandra</strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Cassandra</a>&nbsp;�?2010 �q�出���风��_��但最�l�都以失败告�l�，包括 Twitter 以及 Digg 的案例��我们不得不对 NoSQL 技术是否成熟，是否能在大规模系�l�中应用产生了怀疑。但�q��ƈ不媄�?Cassandra 拔得头筹�Q�因������?Facebook 的支持�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Apache Cassandra&nbsp;</strong>是一�?strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">开源分布式Key-Value存储�pȝ��</strong>。它最初由Facebook开发，用于储存特别大的数据�?strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Facebook目前在��用此�pȝ��</strong>�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">主要�Ҏ��：</p>
<ul style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 20px; margin-right: 20px; margin-bottom: 20px; margin-left: 20px; list-style-type: disc; list-style-position: inside; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">分布�?/li>
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">��Z��column的结构化</li>
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">高��展�?/li>
</ul>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">Cassandra 采用 Java 开发，Apache 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">2. memcached</strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">memcached</a>&nbsp;是老牌的独立缓存服务的领头���，目前国内使用该系�l�的�|�站非常的多�Q�在�q�基���上还有国内开发的&nbsp;<a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">memcachedb</a>&nbsp;�?memcached 支持持久化存储�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">memcached</strong>&nbsp;是一套分布式的快取系�l�，当初是Danga Interactive��Z��LiveJournal所发展的，但目前被许多软�g�Q�如MediaWiki�Q�所使用。不�q�，memcached �~�Z��认证以及安全���制</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">memcached 采用 C 语言开发，可在 Linux �pȝ��下��用，采用 BSD 授权�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">3. Membase</strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Membase</a>&nbsp;�?NoSQL 家族的一个新的重量��的成员，其完全兼�?memcached 的方式，有望�W�络 memcached 的用��L��。Membase 的可伸羃性、集���、复制以及管理方便等�Ҏ��又�?memcached 无法�Ҏ��的�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; font-family: Verdana, Simsun, sans-serif; font-size: 14px; line-height: 24px; ">
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">Membase 同样采用 C 语言开发，支持 Windows �?Linux �pȝ���Q����?Apache 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">接下来介�l�两�Ƒ֛�产的 NoSQL 软�g�Q?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">4. Tair</strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Tair</a>&nbsp;是由淘宝�|�自��d��发的分布式Key/Value�l�构数据存储�pȝ���Q�在淘宝�|�有着大规模的应用。您在登录淘宝、查看商品详情页面或者在淘江湖和好友&#8220;捣浆�p?#8221;的时候，都在直接或间接地和Tair交互�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">Tair 采用 C 语言开发，支持 Linux �pȝ���Q����?GPLv2 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">5. BeansDB</strong></p>
<div   id="wmqeeuq"   class="detail" style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">BeansDB</a>&nbsp;是豆瓣网开发的一个主要针对大数据量、高可用性的分布式Key Value存储�pȝ���Q�采用HashTree和简化的版本��h��快速同步保证最�l�一致性（弱）�Q�一个简化版�?nbsp;<a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Dynamo</a>�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">它采用类�?a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">memcached</a>的去中心化结构，在客��L��实现数据路由。目前只提供�?Python版本的客��L���Q�其它语�a�的客��L��可以由memcached的客��L���E�加攚w��得到�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">主要�Ҏ��包括：</p>
<ul style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 20px; margin-right: 20px; margin-bottom: 20px; margin-left: 20px; list-style-type: disc; list-style-position: inside; ">
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">高可用：通过多个可读写的用于备䆾实现高可用；</li>
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">最�l�一致性：通过哈希树实现快速完整数据同步（短时间内数据可能不一��_���Q?/li>
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">�Ҏ��扩展�Q�可以在不中断服务的情况下进行容量扩展；</li>
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">高性能�Q�异步IO和高性能的Key Value数据<a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Tokyo Cabinet</a>�Q?/li>
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">可配�|�的可用性和一致性：通过N,W,R�q�行配置�Q?/li>
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">���单协议：<a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Memcached</a>兼容协议�Q�大量可用客��L���?/li>
</ul>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">BeansDB 采用 Python 语言开发，支持 Linux �pȝ���Q����?BSD 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">6.&nbsp;<span id="wmqeeuq"    class="hilite1" style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Redis</span></strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><span id="wmqeeuq"    class="hilite1" style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Redis</a>&nbsp;�?/span>一个高性能的key-value数据库�?nbsp;<span id="wmqeeuq"    class="hilite1" style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">redis</span>�?出现�Q�很大程度补偿了<a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">memcached</a>�q�类keyvalue存储的不���I��在部分场合可以对关系数据库�v到很好的补充作用。它提供了Python�Q�Ruby�Q�Erlang�Q�PHP客户端，使用很方�ѝ�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">Redis 的短板：</p>
<ul style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 20px; margin-right: 20px; margin-bottom: 20px; margin-left: 20px; list-style-type: disc; list-style-position: inside; ">
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">�q�个��目�q�很斎ͼ�可能�q�不���_���E�_���Q�而且没有在实际的一些大型系�l�应用的实例�?/li>
    <li style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">�~�Z��mc中批量get也是比较大的问题�Q�始�l�批量获取跟多次获取的网�l�开销是不一��L���?/li>
</ul>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">Redis 采用 C 语言开发，支持 Linux �pȝ���Q����?BSD 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">7.&nbsp; CouchDB</strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Apache CouchDB</a>&nbsp;是一个面向文���的数据库管理系�l�。它提供�?JSON 作�ؓ数据格式�?REST 接口来对其进行操作，�q�可以通过视图来操�U�|�����的�l�织和呈现�?CouchDB �?Apache 基金会的����开源项目�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">CouchDB落实到最底层的数据结构就是两�c�B+Tree �?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">不过最�q�有消息�?CouchDB ���走一条不同于 NoSQL 的�\子，具体情况如何我们只能拭目以待�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">CouchDB 是用&nbsp;<a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">ErLang</a>&nbsp;开发的哦，跨��^台支持，Apache 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">8. Tokyo Cabinet</strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><span  style="font-weight: normal; ">
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Tokyo Cabinet</a>&nbsp;是一个DBM的实现。这里的数据库由一�p�d��key-value对的记录构成。key和value都可以是��L��长度的字节序�?既可以是二进制也可以是字�W�串。这里没有数据类型和数据表的概念�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">当做为Hash表数据库使用�Ӟ��每个key必须是不同的,因此无法存储两个key相同的倹{��提供了以下讉K���Ҏ��:提供key,value参数来存储，�?key删除记录�Q�按key来读取记录，另外�Q�遍历key也被支持�Q�虽焉���序是��L��的不能被保证。这些方法跟Unix标准的DBM,例如GDBM,NDBM �{�等是相同的�Q�但是比它们的性能要好得多�Q�因此可以替代它�?</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">当按B+树来存储�Ӟ��拥用相同key的记录也能被存储。像hash表一 ��L����d���Q�存储，删除函数也都有提供。记录按照用��h��供的比较函数来存储。可以采用顺序或倒序的游标来��d��每一条记录。依照这个原理，向前的字�W�串匚w���?索和整数区间搜烦也实��C��。另外，B�Q�树的事务也是可用的�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">Tokyo Cabinet 采用 C 语言开发，支持 Linux �pȝ���Q����?LGPL 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">9. OrientDB</strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">Orient DB 是一个可伸羃的文档数据库�Q�支�?ACID 事务处理。���?Java 5 实现。OrientDB 最强的一个地�Ҏ��可以使用 �c?SQL 的查询语句进行数据查询�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">OrientDB 采用 Java 语言开发，跨��^台支持，使用 Apache 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">&nbsp;</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><strong style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">10. Hibari</strong></p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><span style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a  style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; color: #3e62a6; outline-width: 0px; outline-style: initial; outline-color: initial; ">Hibari</a>&nbsp;</span>�Q�在日语中意思�ؓ&#8220;云雀&#8221;�Q?span style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">是一个专为高可靠性和大数据存储的数据库引擎，可用于云计算环境中，例如 webmail、SNS 和其他要求T/P�U�数据存储的环境中�?/span>Hibari 支持 Java, C/C++, Python, Ruby, �?Erlang 语言的客��L���?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">Hibari �q�不是一个关�p�L��据库�Q�主要是通过 key-value 的方法进行数据存储�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">Hibari 使用 ErLang 语言开发，支持 Linux/BSD �pȝ���Q�Apache 授权协议�?/p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; "><br />
</p>
<p style="padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; margin-top: 5px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; text-indent: 0em; ">来自�Q?a >http://www.oschina.net/news/14209/2010-top-10-nosql-projects</a></p>
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