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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.

posted @ 2009-04-17 15:20 donnie 閱讀(152) | 評論 (0) | 編輯收藏

DKT DBSync

摘要: 閱讀全文

posted @ 2009-04-17 11:02 donnie 閱讀(363) | 評論 (0) | 編輯收藏

Hadoop Introduction

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.

posted @ 2009-04-17 10:32 donnie 閱讀(148) | 評論 (0) | 編輯收藏

CloudBase 1.2 ,Hadoop 0.19.1 綜合配置功能測試 (淘寶)

http://rdc.taobao.com/blog/dw/archives/286

posted @ 2009-04-17 10:27 donnie 閱讀(184) | 評論 (0) | 編輯收藏

hadoop

http://www.hadoop.org/
http://cn.hadoop.org/

posted @ 2009-04-17 10:26 donnie 閱讀(167) | 評論 (0) | 編輯收藏

辦公室接吻 flash游戲

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posted @ 2009-04-13 21:15 donnie 閱讀(142) | 評論 (0) | 編輯收藏

A SQL Joke

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/

posted @ 2009-04-06 17:03 donnie 閱讀(128) | 評論 (0) | 編輯收藏

Ora-01846: not a valid day of the week

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'

posted @ 2009-04-06 16:00 donnie 閱讀(1151) | 評論 (0) | 編輯收藏

trace session

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posted @ 2009-04-06 11:50 donnie 閱讀(168) | 評論 (0) | 編輯收藏

羽毛球教學視頻

http://v.youku.com/v_playlist/f2076316o1p28.html

posted @ 2009-04-04 18:26 donnie 閱讀(119) | 評論 (0) | 編輯收藏

利用Oracle數據庫存儲和分析Unix操作系統的性能

http://edu.136z.com/DataBase/32042.html

目錄

一、       前言... 4

二、       思路... 4

三、       vmstat腳本及步驟... 4

1.       安裝statspack. 4

2.       創建stats$vmstat表... 4

3.       創建vmstat目錄... 6

4.       創建get_vmstat.ksh腳本... 6

5.       創建run_vmstat.ksh腳本... 8

6.       創建crontab作業，定時執行run_vmstat.ksh腳本... 9

7.       分析數據... 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

posted @ 2009-04-02 10:46 donnie 閱讀(146) | 評論 (0) | 編輯收藏

oracle spfile損壞，如何啟動

改用傳統的pfile方式啟動，具體pfile的內容可從spfile文件中copy，或者從數據庫的警告日志文件中獲取。

posted @ 2009-03-30 22:32 donnie 閱讀(231) | 評論 (0) | 編輯收藏

oracle的NULL

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....

scott@ORCL> select * from dual where null=null;

未選定行

scott@ORCL> select * from dual where null <> null;

未選定行

scott@ORCL> select * from dual where null is null;

posted @ 2009-03-27 22:47 donnie 閱讀(126) | 評論 (0) | 編輯收藏

oracle 多版本一個簡單的例子（在其他數據庫結果可能不同）

scott@ORCL> select count(*) from t;

COUNT(*)

----------

scott@ORCL> begin

2 for x in (select * from t)

3 loop

4 insert into t values (x.username,x.user_id,x.created);

5 end loop;

6 end;

7 /

PL/SQL 過程已成功完成。

scott@ORCL> select count(*) from t;

COUNT(*)

----------

posted @ 2009-03-26 23:18 donnie 閱讀(131) | 評論 (0) | 編輯收藏

plsql error handling

SET SERVEROUTPUT ON;

DECLARE

stock_price NUMBER := 9.73;

net_earnings NUMBER := 0;

pe_ratio NUMBER;

BEGIN

-- Calculation might cause division-by-zero error.

pe_ratio := stock_price / net_earnings;

dbms_output.put_line('Price/earnings ratio = ' || pe_ratio);

EXCEPTION -- exception handlers begin

-- Only one of the WHEN blocks is executed.

WHEN ZERO_DIVIDE THEN -- handles 'division by zero' error

dbms_output.put_line('Company must have had zero earnings.');

pe_ratio := null;

WHEN OTHERS THEN -- handles all other errors

dbms_output.put_line('Some other kind of error occurred.');

pe_ratio := null;

END; -- exception handlers and block end here

ref : http://www.sc.ehu.es/siwebso/KZCC/Oracle_10g_Documentacion/appdev.101/b10807/07_errs.htm

posted @ 2009-03-25 10:52 donnie 閱讀(108) | 評論 (0) | 編輯收藏

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