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天津Ｂ公司：虛擬股份制 
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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/
http://cn.hadoop.org/      摘要:   閱讀全文

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(xiàn)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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目錄

一、       前言... 4

二、       思路... 4

三、       vmstat腳本及步驟... 4

1.       安裝statspack. 4

2.       創(chuàng)建stats$vmstat表... 4

3.       創(chuàng)建vmstat目錄... 6

4.       創(chuàng)建get_vmstat.ksh腳本... 6

5.       創(chuàng)建run_vmstat.ksh腳本... 8

6.       創(chuàng)建crontab作業(yè)，定時執(zhí)行run_vmstat.ksh腳本... 9

7.       分析數(shù)據(jù)... 9

1)    異常報告... 9

2)    每小時趨勢報告... 13

3)    周趨勢報告... 14

4)    長期趨勢報告... 14

四、       使用Excel生成趨勢圖... 15

五、       參考資料... 15
 改用傳統(tǒng)的pfile方式啟動，具體pfile的內(nèi)容可從spfile文件中copy，或者從數(shù)據(jù)庫的警告日志文件中獲取。

在oracle中，NULL與NULL既不相等，也不完全不相等。SQL Server與Sybase中，NULL等于NULL.
--REF: oracle expert....