Oracle 10g 的 ASM (自动存储管理) 真是一把双刃剑，对于存储的管理给 DBA 带来了不少便利，可也存在无穷多的问题。

ASM_POWER_LIMIT 参数

这个参数 ASM_POWER_LIMIT 参数控制 ASM 后台进程 ARBx 的数量。ARBx 进程用来进行 ASM 磁盘数据重新分布打散。ASM_POWER_LIMIT 取值 从 0 到 11(据说从 10gR2 开始可以设置为 0 ). 当新添加磁盘或者删除磁盘后，ASM 会启动 ARBx 进行 IO 分散操作，这是个非常消耗资源的动作，所以一定要选择系统空闲的时候进行。

关于 ASM 的条带与分配单元

ASM 默认的 Stripe Size 为 128K。 (一般操作系统的一个 IO 最大是 1M，对于 Block Size 为 8K 的系统，一般来说，db_file_multiblock_read_count 设置为 16 即可)。分配单元（ Allocation Unit ） 是 1M，这个 AU 对应 extent 。在一些 DW 环境，随着数据量增大，AU 会非常的多，会产生性能影响。Stripe Size 和 AU 是可以通过 ASM 实例上的两个隐含参数调整的：

• _asm_ausize
• _asm_stripesize(注意最大1M，否则会有负面影响)

磁盘组不能 mount

错误信息类似如下：

ORA-15063: ASM discovered an insufficient number of disks for diskgroup "FOO"

这个问题是因为 设备 PVID 导致的，一般可以通过如下三个方法解决：

• 对磁盘组中的设备进行 dd 操作抹去磁盘 0 块的内容
• 用 FORCE 选项把磁盘添加到其他磁盘组中。
• 用 FORCE 选项用所有这些磁盘创建新的磁盘组。

哪一种方式都有风险，操作需要谨慎。 --EOF--

天文学家现在正在邀请公众共同参与一项旨在对一百万个星系进行分类的计画. 访问 www.galaxyzoo.org 即可在欣赏这些美丽星系照片的同时帮助天文学家对这些星系进行分类. 这些照片中的大部分从未被人眼检视过, 你可能成为第一个看见这些照片的人.

车东 posted a photo:

左边是汽油消耗量对比：2003年数据

文章出处：
www.economist.com/displaystory.cfm?story_id=9430924&C...

如果您看不到以上图片：请用FireFox + Access Flickr 插件
addons.mozilla.org/en-US/firefox/addon/4286

安装说明： www.chedong.com/blog/archives/001355.html

5月底参加的另外一个大会是搜索引擎战略大会。搜索引擎对于目前网站流量来源的重要性可以从以下数字看出： 搜索引擎不直接给用户解决问题，只是提供一个到达目标的转向： 一般来说：带给其他网站的流量相比搜索引擎的搜索流量是要大于1的（用户搜索一次，一定会点击超过一下）。所以搜索引擎有多少流量，带给目标网站的流量可以乘个1.5。中国每天有多少搜索流量？ 3-4亿，带给其他网站的流量是多少？ 5-6亿。中国每天有几千万用户产生的几十亿流量，而搜索引擎就掌握了其中的5%左右的入口流量，对于很少给其他网站带去流量的内容网站来说，这几乎是所有来自非本站流量（referer）的90%以上。 以下是厦门大会上的部分问题摘要： 为什么你的网站被冥王星了？

参加大会之前曾经要求过主办方将单元标题将"为什么你的网站被删了"改成"为什么你的网站被冥王星了", 而从实际的反馈来看, 网站更关心的问题是为什么其他网站作弊而没有被“冥王星”? 直接向搜索引擎服务商举报是目前的一个途径, 以下是几个引擎的spam提交地址： 百度: http://utility.baidu.com/antispam/spamreport.html Google: http://www.google.com/contact/spamreport.html 中国雅虎搜索: http://help.cn.yahoo.com/feedback.html?product=onesearch

如何保护自己的文章(搜索引擎如何保证原创性内容排名靠前):

再推销一下chedong copyright . 这个方法很有效, 为用户正确的标记文章原始出处提供方便, 通过法律途径对于不遵循你声明的版权信息的网站进行反击或者积极推进相关法律的形成和执行，我相信用户还是希望做正确的事情的，如果你为他们提供方便的话

Scott Smith附上了这些广告，他将广告指向Envirolet.com网站： 广告写道：“这是个测试广告——请升级图片广告，一旦他们发送广告的时候。来自dell.ca”。讽刺的是，这些怪异或者幼稚的广告通常最引人注目。比如，下面的广告足够抢眼，我今年初就指出过它： 当然，还有这些种类繁多愚蠢的、半自动的eBay广告，所有这些都是由eBads收集： 这些eBay广告明显是烦人的。但是我想广告中使用很少文字或者使用愚蠢的文字广告确实有可能避免AdSense盲点。还有什么是其他能产生如此效果的策略呢（从广告创作人的观点看）？ [感谢 Scott!] 原文： Stupid AdSense

FeedBurner的官方Blog宣布，Google已经将FeedBurner整合到Google的Blogger.com中，这一举动大家早有预料。这是Google收购FeedBurner后的第二个针对用户的改进，第一个是把FeedBurner的收费服务免费提供用户使用。

现在，你可以直接把你在Blogger.com中Blog的原始RSS Feed地址转向到FeedBurner中的某一个Feed地址。这样一来，原来无论是订阅原始Feed或者是订阅FeedBurner Feed的读者，都可以聚合到一起进行统计，Blog的作者可以更加全面的了解其读者的信息了。而使用方法很简单，只需要进入Blog设置，然后在“供稿”（Site Feed）中设置Feed转向的目标地址即可。这里有详细的设置方法可以作为参照。

其实，Google实现这项功能只是为Blogger.com中Blog的Feed增加了一个自动转向的功能。所以，其实除了FeedBurner以外，你也可以把Feed转向Feedsky等其它的Feed订制服务中去。

需要注意的是，这项服务目前只对host在Blogspot.com上，或者是使用新版Blogger.com中自定义域名的那些Blog有效，而像我这样使用FTP发布到外部空间的Blog暂时还不支持这样的功能。一定要确定自己使用的是Blogger.com的哪种服务再去尝试，否则可能会造成Feed地址出错的严重后果。

Stay foolish As it is usually hard to define which style is better, the developers in the open source community should indeed stay foolish. 不要评论别人的代码风格的原因

an interesting talk by Jonathan Harris, known from impressive information aesthetic works such as universe & love lines & feel fine & ten by ten. (did I forget something?)

[links: ted.com & ted.com]

see also the recent Hans Rosling talk at the TED conference.

a 3D meeting in Second Life space that specifically exploits the unique characteristics of virtual space. the space aim to facilitate discussions where there is a clear agree/disagree continuum, such as funding decisions, community town-hall discussions, or hiring decisions.

avatars are positioned depending on their agreement of a particular topic being discussed. the meeting space provides a visualization of an avatar's complete movement & chat history in the space. as avatars move in the space, their paths are traced out in the sky above the space, showing any change in opinion.

[link: mit.edu & technologyreview.com|thnkx angus]

Posted by randfish

There's lots to cover, and since Seattle's finally cooled down to a bareable 70 degrees (from the high of 93 today), I'm ready to jump in.

• I did a fun little podcast last week with the folks from the Beginning SEO Podcast. Towards the end is a list of some valuable advice for social media and viral marketers.
• I love that John Chow doesn't rank for his own name. It just makes for such a great example to show clients and conference audiences why you shouldn't publicly flaunt Google's policies.
• Andy has a collection of all the Marketing Pilgrim Essays from the contests he's run. Probably not a bad thing to hand out to a journeyman SEO at your company with the instructions - "highlight the best and worst pieces of advice in this."
• I also did an interview about mobile search (and came across as not particularly educated on the subject because I've really only dipped my toes in the space) and now see that there's $22 billion worth of transactions set to take place over mobile devices by 2011. Shoemoney - I hope you still have those ringtones sites going gangbusters. Or maybe it's all Amazon's one click over mobile, which strikes me as a bit dangerous.
• Everyone's linking to Aaron's example of 301'ing a domain, probably because it's a really good piece on the subject.
• 10,000 human evaluators at Google - I think there's more, though it's probably a true "job" for only about 10,000. I seem to recall hearing that Google employees can report spam and bad results as they surf - maybe that's just in the search quality group, though. I'd love to see some screenshots of that :)
• Ask built a datacenter near the Grand Coulee dam. Thank goodness, too. I've been hoping they would ramp up their spidering - the algo is great, but seriously, I still see sites that launched years ago that have yet to be visited by Ask. Hopefully this will help.
• Mr. Enge interviewed Udi Manber from Google's search team. Of course, he says Google has no plans for employees providing "editorial oversight" into the results... I guess no one told him about those 10,000 evaluators (or maybe they just don't use any of the data collected from those employees - they're just a decoy for the algo).
• Loved this post from Russ Jones - Bad Stats are Holding Back Web 2.0. His example of the one Web 2.0 site in the wine space getting ratings right is also incredibly enlightening (and surprisingly intuitive).

As always, feel free to pitch in with your favorites in the comments.

BTW - Has anyone ever gotten to see the quality rating console from Google? With 10,000 reviewers, you'd figure that eventually there'd be some leaked screenshots (more recently than Henk Van Ess). Seriously, how do they keep the secrets so well bottled up?

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Got a shiny new iPhone? Got shiny new MT4 Beta? Well, every listing screen in MT4 has built-in feeds for things like managing your entries and comments, all you've got to do is look for the feed icon on the...

Hot on the heels of last week's much-ballyhooed free FeedBurner for everyone, we are very excited to announce the immediate availability of one-click redirection for Blogger Blogspot blogs (note our fine use of both alliteration and first syllable congruence).

If you host your content on a Blogger blog with a blogspot.com address (or use Blogger's “custom domain” feature), you can now redirect your native Blogger feed to your FeedBurner feed (quite easily, might we add). Gone are the muggy, languorous days of wrestling with "autodiscovery" tags in foreboding corners of your Blogger template code or hacking through this tangled discussion thread for a glimpse of configuration clarity. Starting right now, you just log into your Blogger account, select Settings | Site Feed, enter your FeedBurner feed address and click "Save Settings." Zap! Pow! Kraaakkkk! Now you've got the complete picture of how your content is being consumed out here, out there, out everywhere.

Why is redirecting so important?
We're glad you asked. By redirecting your feed, you can get a true picture of how many subscribers you have. Some of you might even see a few more subscribers magically appear, though results will most certainly vary. Why so? Sometimes, publishers inadvertently fragment their feed audience by offering more than one feed address on the blog itself or within their autodiscovery tags (the method by which feed readers automatically detect the address of your feed for syndication purposes). This results in some subscribers not being counted, and no one wants that in a world where everyone should count for something. By redirecting your feed, you can consolidate any straggler subscribers and greatly improve your ability to effectively measure your audience.

Getting started
Our Blogger QuickStart guide has been updated to include all the necessary info for redirecting your feed. And, since you've made it this far in today's post, now is a good time to let you know we're still accepting Publisher Buzz submissions, so if you have a good story to tell about your newly integrated Blogger feed or your experience using our feed-related services, submit it to buzz@feedburner.com.

Blog on, good peoples.

It's been about two months since we launched the new Google Analytics interface and the response has been overwhelmingly positive. And since then, we've updated the new Google Analytics with the most requested features. We'll continue updating the new Google Analytics going forward, of course, but here's your reminder that the earlier version of Google Analytics will be removed on Wednesday, July 18th. Most of you already know this from the message on your Analytics Settings page and from earlier posts here, but we wanted to give everyone another reminder.

If you haven't yet transitioned, you might check out these resources:

• the animated tour of the new version,
• the Report Finder tool, which maps where data from the previous interface is located within the new version, (also available within your reports in the left navigation menu)
• the FAQs,
• and the features page for the new version.
  

Posted by Christian Yee, Google Analytics Team

日前Google宣布以6.25亿美元的价格，收购了专业的信息安全服务商Postini。Postini主要为用户提供信息安全、存档、加密及安全策略的执行方案。

Google除了搜索以外，应用范围最广、最受欢迎的产品是什么？从我这个用户的角度来看，理所当然的应该是包含了邮件服务Gmail、通讯服务Google Talk等的Google Apps，它们都是免费提供用户使用的。虽然Google Apps也在陆续推出收费产品，但是就目前所提供的这些产品的附加值来说，对中小企业的价值并不是特别大，而对于大型企业和组织来说，就更没有吸引力了。

而Google这在作个方面的努力来改变这种状况。对Google文件的不断改进以及相关的收购活动（1, 2），以及前不久前对于电话转接服务GrandCentral的收购都可以看作是Google为企业应用服务的开发与整合所作的铺垫。而这次的收购，很大一部分也是出于这样的目的。

对于大部分企业或组织来说，除了功能上的多元化外，完善的管理信息管理机制及其信息的安全性保障是他们更为关心的问题。而Google收购Postini，就是要在信息安全性方面加强自己的产品竞争力，让Google Apps向一套优秀的商用产品转变。并最终成为对于企业用户具有商业吸引力的解决方案。

Google可能并不会把真正的大型企业或组织作为Google Apps的目标客户，而是会逐步的建立一套适用性广泛，功能强大并具有高度安全性的标准化企业套件，让众多的中小企业成为它的收费用户。侵占利基市场向来是Google的长项，Adsense最终占到Google总收入的四成，是最有说服力的例证。Google也希望Google Apps的销售有一天可以成为Google赢利模式中的一个重要组成部分。

另外，对Postini的收购也为Google直接获得了Postini的35000个商业用户。Google在抢占渠道的时候，出手总是比较阔绰。

我应该算是个变形金刚的fans了，我的书架上整整齐齐地放着变形金刚大电影、变形金刚三季的正版DVD和头领战士、隐形战士的DVD，电脑里还躺着一套变形金刚塞伯坦传奇（没卖，不然也买了来...