Access to DataStage Universe
2007/02/28
Although DataStage is going to abandon Universe as its repository, it is still useful if you have not yet migrate to version 8. You may also found some useful utilities in the universe admin interface. Here is the details :
(1) To retrieve job information …
$DSHOME/bin/uvsh “select * from DS_JOBS;”
(2) To list and unlock all present lock ….
LIST.READU EVERY
UNLOCK ALL
(3) Invoke admin tool …
DS.TOOLS
(4) To delete and recreate a log file …
DELETE.FILE DATA RT_LOG182
CREATE.FILE DATA RT_LOG182 30
the number in “RT_LOGxxx” can be found using (1) …
IBM DB2 Tech Library
2007/02/26
A few articles for DB2 usser, particular for those who use Viper or DWE …..
香港電子地圖的發展
2007/02/24
隨着 Google 於 2005 年推出 Google Maps 服務，電子地圖的發展變得一日千里。當然，內地的幾個互聯網大龍頭，百度、新浪、搜狐等都推出了近似的服務，但 Google Maps 提供了開放式 API 的配套，令美國本土的電子地圖應用一時間百花齊放，好不熱閙。
而香港在互聯網提供的電子地圖服務，一直都被中原壟斷。中原地圖提供了完整的地圖資料及相關的搜尋工具，但亦同時限制了更廣泛的應用。當中除了基本商業因素的考慮之外，政府的政策始是作俑者。
中原地圖的資料其實大部份由香港地政總署測繪處提供。而這些資料亦可經地政總署公開購買的。不過，若應用到互聯網上，就必須得到地政總署的批准，登記成為 “互聯網地圖認可用戶”，並根據網頁瀏覽的資數 (page view) 支付費用。
其實政府是有意為大眾提供更方便的電子地圖服務，但選擇了一貫官商聯手的方式，與電盈合作推出黃頁地圖，不過效果就 . . . 若果政府可以用更開放的政策， 去除煩鎖的收費，降低入場的門檻，定必能提供更大的發展空間。
相關資料
地政總署 -「衣食住行網上圖」計劃
地政總署 – 「互聯網地圖認可用戶」服務
Update
Google 不知從何時開始提供了香港衛星圖像以外的地圖資料，現已有道路名稱、駕車方向、鐵路、政府機構、大型商場的資訊。如果有更詳盡的大厦資料及搜查工具，在不久的將來可能會取代中原，成為香港主要的電子地圖提供者。
Job Index in Recruit.net
2007/02/10
Recruit.net offers a new feature : Job index. Somethings like Google Trend, but this time focus on keywords found in job ad. In view of the success of the company in the already developed market, there is still space for niche searchengine, e.g. property, bid, restaurant …etc. Given that the searchengine provide excellent searching power, friendly user interface, and RSS feed that alert user for any update …
New Era of User Interface
2007/02/05
A great innovation, mutli-touch driven computer screen was launched. And the new era of user experience is redefined !!! Watch the following videos to get the brief idea :
http://ted.com/tedtalks/tedtalksplayer.cfm?key=j_han
http://dwerf.wordpress.com/2007/02/04/perceptive-pixel/
or read :
SSH Security Cautions
2007/02/04
Although SSH is designed to be more secure, there is still risk using it in enterprise :
Since SSH-1 has inherent design flaws which make it vulnerable to, e.g., man in the middle attacks, it is now generally considered obsolete and should be avoided by explicitly disabling fallback to SSH-1. While most modern servers and clients support SSH-2, some organizations still use software with no support for SSH-2 making it hard to avoid the use of SSH-1.
In all versions of SSH, it is important to verify unknown public keys before accepting them as valid. Accepting an attacker’s public key as a valid public key has the effect of disclosing the transmitted password and allowing man in the middle attacks.
As with any encrypted protocol SSH can be considered a security risk by companies or governments who do not trust their users. Furthermore SSH has built in tunneling features which make it easier for users to achieve passage of large volumes of information or to establish an entry point for unauthorized inward access over a SSH link than with other protocols.
Moving Data Between Machines In a Secure Way
2007/02/04
Just learn about some new options moving files between machines using ssh / sftp /scp.
For example, creating an archive, copying it to remote destination, and extracting it in a single command :
$ (cd ~/stuff; tar --create --gzip --file - *) | \ ssh destination tar --extract --gunzip --file --verbose -C stuff
or :
$ ssh destination cat archive.tgz | \ (cd ~/stuff; tar --extract --gunzip --file -)
or
$ scp -pr ~/doc destination:/path/to/doc/
or
$ rsync -e ssh --times *.txt destination:
With ssh setup properly, these options are secure. However, I am still uncertain about any performance issue, as compare to other enterprise class product, e.g. Connect:Direct.
