MongoDB学习
1. MongoDB在32位操作系统上，单个数据库不能超过2GB。 会有16M、32M、64M、128M、256M、512M、512M这几个数据库文件。再多了就不行了。最大 1536MB。 2. MongoDB拥有地理位置索引，很好的支持LBS功能。 3. 传言MongoDB对内存的占用比较大，数据都是先到内存
1. MongoDB在32位操作系统上，香港服务器，单个数据库不能超过2GB。
会有16M、32M、64M、128M、256M、512M、512M这几个数据库文件。再多了就不行了。最大1536MB。
2. MongoDB拥有地理位置索引，很好的支持LBS功能。
3. 传言MongoDB对内存的占用比较大，数据都是先到内存，再到磁盘。
对于MongoDB的选用，毕竟是新技术，保守还是使用MySQL，MongoDB的适用场合:
1. 数据对象的形态经常发生变化，常有增减字段的可能，网站空间，此时可以利用mongo schema-free特性.也就是MongoDB集合中的文档，是可以没有表结构的，每个集合的各个文档之间，结构可以完全不同。，香港空间
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