Welcome to the 102^nd edition of Log Buffer, the weekly review of database blogs.

Since it was DB2’s 25^th birthday this week, as Anant Jhingran reports, let’s start with it.

From ZDNet this week came a story that IBM was considering the open-sourcing of DB2 — big news, naturally, whether true or not. Matthew Aslett of 451 CAOS Theory says, Open source DB2? I don’t think so, suggesting that it was merely theorizing on the part of one IBM executive, and hype on the part of ZDNet. “Then of course,” Matthew continues, “there is the issue of why IBM would open source DB2. Where is the business driver? Despite solid competition from Oracle and Microsoft, the company is doing pretty well with DB2 as it stands, thanks very much, and open source databases have had minimal impact on the established vendors.”

Matt Asay of The Open Road likewise comes down on the uh-uh side of this. “It was . . . no surprise to see IBM quickly follow up ZDNet’s article with a blunt statement: ‘IBM has no plans to open source DB2.’ Of course it doesn’t.  . . . The day that it needs DB2 to undermine Oracle’s database, however, we may see IBM making a similarly bald statement…in the other direction.”

On An Expert’s Guide to DB2 Technology, Chris Eaton offers some news on DB2 videos, including ChannelDB2’s video tutorials, IDUG’s video competition, and a funny video from IBM on the making of a “viral” industrial video. Such as itself.

On to MySQL now. Keith Murphy made his debut on the Pythian blog this week, with a link to some video tutelage of his own — his presentation to the Boston MySQL Users Group on backups. Jay Pipes also offers the slides for his address on Join-Fu: The Art of SQL (I and II). (I rarely cover presentation materials when I do Log Buffer, but these ones of Jay’s looks fantastic.)

Mark Schoonover reports that Keith’s and his 2008 MySQL Magazine survey is officially closed, adding, “Now the fun begins compiling all the data and pretty charts made. We’ve had 432 responses!”

Baron Schwartz of xaprb describes how to write a lazy UNION in MySQL. No, it doesn’t deal with posting a complaint about undefended job benefits. Baron explains: “Something occurred to me a couple of weeks ago: why not write a UNION that stops executing as soon as one part of it finds a row? Then you can UNION to your heart’s content and not incur the overhead of that second lookup unless you need it. For lack of a better term, I’m calling this a lazy UNION.”

(more…)

偶尔看到这篇文章，感觉对自己对单位里的同事都很有作用，就转载过来让大家共勉。

对于在公众场合演讲，我想大部分人都会面临一个最大的问题，那就是紧张。一旦紧张，就会导致不自信，很多问题就会出现，心跳加速，呼吸沉重，结巴，忘词，语速过快等等。对于如何克服紧张我也经过了一个过程，最早的时候每当当众发言就会紧张，刚才提到的演讲中的问题都会出现，但现在不管是在公司内部会议上，客户报告讲演，还是给别人提供培训，我已经能做不错的演讲了。

我是如何克服紧张的呢？实际上即使是最好的演讲者都会紧张的，问题是你如何控制紧张。如果你不能控制你的紧张，那糟糕的演讲不可避免，颤抖的声音甚至会让你的听众都觉得非常费劲。如果控制得好，紧张可以让你更加集中注意力，思维更清晰，眼见更流利。所以，记住了，面对紧张不要害怕，因为每个人都会紧张，关键是你如何控制它。以下是我控制紧张的小窍门：

1. 不停的告诉自己，你准备的很好，一切尽在掌握中，完全不必要紧张
2. 上台前深呼吸
3. 上台前紧握自己的拳头然后松开，这样重复几次可以转移你的注意力

另外，从我自己的经验来说，要做一个好的演讲，还要注意以下几点：

1. 注意仪表着装，好的仪表给你自信，如果现场灯光较暗，最好选择亮色衣服，这样可以吸引听众注意力
2. 用眼光和你的听众交流
3. 语速要适中，不能过慢，也不能过快，过快和过慢都是不自信的表现
4. 正面面对你的听众，不要侧身或者背身
5. 加一些手势或身体语言能让你的演讲更有感染力

记住，只要你准备充分，完全可以做一次出色的演讲，你所要做的就是要控制你的紧张，记住是控制而非消除。

转载地址：http://www.ideatalks.cn

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