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2009-04-24 10:54 donnie 阅读(246) |
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2009-04-23 11:25 donnie 阅读(134) |
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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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2009-04-17 15:20 donnie 阅读(132) |
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2009-04-17 11:02 donnie 阅读(350) |
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编辑 收藏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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2009-04-17 10:32 donnie 阅读(123) |
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2009-04-17 10:27 donnie 阅读(161) |
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2009-04-17 10:26 donnie 阅读(145) |
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2009-04-13 21:15 donnie 阅读(126) |
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编辑 收藏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/
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2009-04-06 17:03 donnie 阅读(106) |
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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
出现的是中文的字符日期，如下：星期五 12月 19 13:53:15 2008
是字符集的问题，解决：
alter session set nls_date_language = 'American'
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2009-04-06 16:00 donnie 阅读(1114) |
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