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http://www.hadoop.org/
The Apache Hadoop project develops open-source software for reliable, scalable, distributed computing, including:

• Hadoop Core, our flagship sub-project, provides a distributed filesystem (HDFS) and support for the MapReduce distributed computing metaphor.
• HBase builds on Hadoop Core to provide a scalable, distributed database.
• Pig is a high-level data-flow language and execution framework for parallel computation. It is built on top of Hadoop Core.
• ZooKeeper is a highly available and reliable coordination system. Distributed applications use ZooKeeper to store and mediate updates for critical shared state.
• Hive is a data warehouse infrastructure built on Hadoop Core that provides data summarization, adhoc querying and analysis of datasets.

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http://www.hadoop.org/
The Apache Hadoop project develops open-source software for reliable, scalable, distributed computing, including:

• Hadoop Core, our flagship sub-project, provides a distributed filesystem (HDFS) and support for the MapReduce distributed computing metaphor.
• HBase builds on Hadoop Core to provide a scalable, distributed database.
• Pig is a high-level data-flow language and execution framework for parallel computation. It is built on top of Hadoop Core.
• ZooKeeper is a highly available and reliable coordination system. Distributed applications use ZooKeeper to store and mediate updates for critical shared state.
• Hive is a data warehouse infrastructure built on Hadoop Core that provides data summarization, adhoc querying and analysis of datasets.

http://rdc.taobao.com/blog/dw/archives/286 http://www.hadoop.org/
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A SQL query walks into a bar and sees two tables. He walks up to them and says 'Can I join you?'

from:  http://tkyte.blogspot.com/

select to_date('Mon Jan 21 13:25:47 2008', 'dy mon dd hh24:mi:ss yyyy') from dual
Ora-01846: not a valid day of the week
出現的是中文的字符日期，如下：星期五 12月 19 13:53:15 2008
 是字符集的問題，解決：
alter session set nls_date_language = 'American'
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