Skip to main content

OOW2006 - Day 1 (Monday) : Worst Practices Day

Image
By
For me this Monday started with an (Developer) Keynote by Thomas Kurian: The next application platform. Thomas pointed out three main trends : SOA, Information Driven Architecture an Grid Computing Architecture. For the developers (about 1200 in the Grand Ballroom of the Hilton) he mentioned the tools Oracle offers for building applications on the 3-tier architecture (of course: JDev, SOA Suite and SQL Developer). The most important announcement was the availabilty of the Oracle Developer Depot, were you can easily download an install Java applications to facilitate code reuse and simplify the development process. Of course you can upload your work to this comunity. You can even win a meet and greet with Larry (or an HD TV) if your software is selected as "the best".

For the next session a headed over to Moscone for The Future of DB Technology by Andy Mendelsohn. He addressed (a.o.) the next interesting new products / features / options :
      Information Lifecycle Management
      How to match storage to the information lifecycle to minimize costs (put data that you need less often - or with less performance - on less expensive storage ) by using partitioning. For decision support Oracle offers the Oracle ILM Assistant, a free downloadable program that shows the gains and migration of implementing ILM.

      Database Vault
      Audit and manage the use of data by other users (even the DBA) under the motto "Keep your DBA out of the database".

      Online Application Upgrade (or Online Hot Patching)
      To assure 24x7 availability in Oracle 11 you can upgrade your database while users are using the application. Currently logged in users continue working in the pre upgrade version of the application, new logins will use the upgraded application. They even showed an impressive live demo of this feature!

      Database Capture (I think that was the name he used)
      A tool to capture SQL statements from one environment (e.g. Production) and run it in another (e.g. Test) and localize the differences in the CBO and/or capture statements in a pre upgrade version (e.g. Oracle 10g) and replay these statements in an upgraded version (e.g. Oracle 11) to spot the differences in execution plans - to facilitate the tuning pre- and post upgrade.

The third session this day was Developing PL/SQL Programs Using Automated Unit Testing by my honourable colleague Andrew Clarke. He used the utPLSQL framework ( http://utplsql.sourceforge.net, http://utplsql.oracledeveloper.nl) to facilitate Test Driven Development - an approach that is also strongly supported by Quests PL/SQL Evangelist Steven Feuerstein.

The fourth session was Database Worst Practices by Thomas Kyte. A very popular session, because although the session was sold out, 200 people stood in line to get in! Luckily for those who missed it, Tom repeated this gig on Thursday. In his own special way, with lots of humour, Tom gave a tongue-in-cheek presentation (which is not - yet - available on the Openworld Presentation Download site, but it is on asktom!).
The most important "worst practices" were:
      Never ever question authority
      You do not need bind variables
      You don't want to expose end users to errors (exception when others then null)
      Generic is better
      You don't need a design
      Create as many instance per server
      Reinvent database features
      No need to test
      Only use varchar
      Commit frequently
      No scalability needed, because nothing ever changes

The fifth and last session (who says that visiting OOW isn't hard work!) was called Unleashing the Power of Oracle Streams by Patricia McElroy. I wasn't familiar with Streams (a little with AQ), but was quite impressed with the capabilities of this feature (option?). Streams facilitates an asynchronous information sharing architecture by capturing, staging and consumption of data. IMHO the functionality is similar to the ESB but on the database tier instead of the middle tier. Because the processes run close to the data I expect that the throughput of Streams will be much higher (compared to using the ESB).

After all this hard work this evening was reserved for the OTN Night in the St Francis (just across the street from our hotel). By accident I first visited a Quest party on the 32nd floor of the hotel, with good food, free drinks and a splendid view of SF. When I came down to the 2nd floor the OTN Jeopardy game was still going on, where the contesters excellerated in giving wrong (or no) answers to difficult Oracle related questions (I did not get one right answer...) and everybody was having good time eating, drinking, talking, dancing and looking and the belly dancers (with snake).

Comments

Post a Comment

Popular posts from this blog

How to create neatly formatted Excel documents using PL/SQL?

By
If there is a requirement to produce output from an application into Excel, you would probably create a CSV (Comma Separated File) with the data and start Excel to show the data - at least that's what I did...until now. The drawback of this solution is that you could only produce data and no nice layout. But Excel is also capable of opening HTML-files and using this you could create Excel files with data and magnificent layout! Let me give an example: 1. Create a procedure to show the data in formatted in an HTML table. CREATE OR REPLACE PROCEDURE display_emp_list IS v_emp_count NUMBER(5); v_empno NUMBER(8); v_ename VARCHAR2(50); v_job emp.job%TYPE; v_sal emp.sal%TYPE; v_bg_color VARCHAR2(10) := ''; CURSOR c_emp IS SELECT empno, initcap(ename), job, sal FROM emp ORDER BY ename; BEGIN SELECT COUNT(*) INTO v_emp_count FROM emp; owa_util.mime_header('application/ms-excel', FALSE); htp.p('Content...
21 comments
Read more

Refresh selected row(s) in an Interactive Grid

By
In my previous post I blogged about pushing changed rows from the dabatase into an Interactive Grid . The use case I'll cover right here is probably more common - and therefore more useful! Until we had the IG, we showed the data in a report (Interactive or Classic). Changes to the data where made by popping up a form page, making changes, saving and refreshing the report upon closing the dialog. Or by clicking an icon / button / link in your report that makes some changes to the data (like changing a status) and ... refresh the report.  That all works fine, but the downsides are: The whole dataset is returned from the server to the client - again and again. And if your pagination size is large, that does lead to more and more network traffic, more interpretation by the browser and more waiting time for the end user. The "current record" might be out of focus after the refresh, especially by larger pagination sizes, as the first rows will be shown. Or (even wors...
Post a Comment
Read more

APEX ReadOnly Pages - The easy way

By
If your Oracle APEX Application requires different types of access - full access or readonly - for different types of users, you can specify a Read Only Condition on Page level (or Region, Item, Button, etc.).  You can set an Authorization Scheme on Application level, so it'll be applied to all pages. So if you have an Authorization Scheme named 'User Can Access Page' defined by a PL/SQL function like this: return apex_authorization.user_can_access_page ( p_app_id  => :APP_ID , p_page_id => :APP_PAGE_ID , p_user    => :APP_USER );  then you can code all the logic in the database using the APEX Repository, your own tables or a combination to define whether a user has access to that page or not. But alas it is not possible to define something similar Application wide for a Read Only condition. You can specify an Authorization Scheme 'User has Read Only Access' using a similar signature as the one above and use that on each and e...
Post a Comment
Read more