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• Deletes that Split Pages and Forwarded Ghosts

  - by Paul White

  Can DELETE operations cause pages to split? Yes. It sounds counter-intuitive on the face of it; deleting rows frees up space on a page, and page splitting occurs when a page needs additional space. Nevertheless, there are circumstances when deleting rows causes them to expand before they can be deleted. The mechanism at work here is row versioning (extract from Books Online below): Isolation Levels The relationship between row-versioning isolation levels (the first bullet point) and page splits is...(read more)

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• Questions About Oracle Solaris 11 ? Join The Expert Live Chat !

  - by Markus Weber

  Our recent Oracle Solaris Online Forum was quite popular, especially in the number of questions that have been asked, and answered.In case you missed it, make sure to watch the replay(s). Considering that the sheer amount of questions we got during this event, we decided to listen to you again, and give you direct access to several senior Oracle Solaris engineers and product managers, by joining our Oracle Solaris 11 TechTarget Live Chat - June 27, 8am - 11am PT Register Today ! Senior engineers confirmed so far are: Bart Smaalders, Dave Miner, Nicolas Droux, David Comay

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• Build a Contractor Website to Boost Your Construction Business

  Almost all kinds of business can get into the internet. Whether your business involves products, sales or services, it can be advertised online for the purpose of gaining more profits.

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• REST API at backend and MVC Javascript framework at client side

  - by Prashere

  I am building an online social network. I have finished writing RESTful API service using Django. This will return only JSON response (No HTML will be generated from server side) so that this JSON response can be used to build native smartphone apps. API service being common to all clients. My question is, since there is no HTML response from server side, can the MV* Javascript Frameworks like Angular / Backbone / Ember take care of complete Front-end, right from generating HTML page with CSS?

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• Költözik a blog

  - by lsarecz

  Kedves Olvasó! A közelmúltban elhatároztuk, hogy az Oracle Hungary jelenleg muködo magyar nyelvu blogjait összevonjuk, és egy közös blogba publikál az összes szakérto kolléga. Ezzel remélhetoleg egy gyakran frissülo, hasznos szakmai tartalommal felöltött online napló születik, ami az eddigi egyébként is nagyszeru blogjainkat is felülmúlja. Az új Oracle Hungary Technology Blog itt található: https://blogs.oracle.com/hunoratech/

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• Javascript - is this a grey area for anyone else?

  - by Anonymous -

  I have a firm understanding of HTML, CSS, PHP, MySQL (and to some extent apache/linux) and find that one of the things missing from my 'web development knowledge base' is javascript - creating richer user interfaces. I'd like to learn Javascript before I look at any frameworks (I've used light javascript/jquery before, but that's besides the point). Can anyone recommend a firm book or online documentation from 'absolute beginner' to 'expert' for javascript? I seem to be finding too many 'display the time' and 'hello world' tutorials...

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• How to find out if my hosting's speed is good enough?

  - by Mert Nuhoglu

  There are lots of different online performance tests: Google PageSpeed Insights iWebTool Speed Test AlertFox Page Load Time WebPageTest Also there are several desktop/client software such as: ping tool YSlow Firebug's Net console Fiddler Http Watch I just want to decide if my hosting provider has a good enough performance or if I need to switch my hosting to another provider. So, which tool should I use to compare my hosting provider with other hosting providers?

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• ZFS for Database Log Files

  - by user12620111

  I've been troubled by drop outs in CPU usage in my application server, characterized by the CPUs suddenly going from close to 90% CPU busy to almost completely CPU idle for a few seconds. Here is an example of a drop out as shown by a snippet of vmstat data taken while the application server is under a heavy workload. # vmstat 1  kthr      memory            page            disk          faults      cpu  r b w   swap  free  re  mf pi po fr de sr s3 s4 s5 s6   in   sy   cs us sy id  1 0 0 130160176 116381952 0 16 0 0 0 0  0  0  0  0  0 207377 117715 203884 70 21 9  12 0 0 130160160 116381936 0 25 0 0 0 0 0  0  0  0  0 200413 117162 197250 70 20 9  11 0 0 130160176 116381920 0 16 0 0 0 0 0  0  1  0  0 203150 119365 200249 72 21 7  8 0 0 130160176 116377808 0 19 0 0 0 0  0  0  0  0  0 169826 96144 165194 56 17 27  0 0 0 130160176 116377800 0 16 0 0 0 0  0  0  0  0  1 10245 9376 9164 2  1 97  0 0 0 130160176 116377792 0 16 0 0 0 0  0  0  0  0  2 15742 12401 14784 4 1 95  0 0 0 130160176 116377776 2 16 0 0 0 0  0  0  1  0  0 19972 17703 19612 6 2 92  14 0 0 130160176 116377696 0 16 0 0 0 0 0  0  0  0  0 202794 116793 199807 71 21 8  9 0 0 130160160 116373584 0 30 0 0 0 0  0  0 18  0  0 203123 117857 198825 69 20 11 This behavior occurred consistently while the application server was processing synthetic transactions: HTTP requests from JMeter running on an external machine. I explored many theories trying to explain the drop outs, including: Unexpected JMeter behavior Network contention Java Garbage Collection Application Server thread pool problems Connection pool problems Database transaction processing Database I/O contention Graphing the CPU %idle led to a breakthrough: Several of the drop outs were 30 seconds apart. With that insight, I went digging through the data again and looking for other outliers that were 30 seconds apart. In the database server statistics, I found spikes in the iostat "asvc_t" (average response time of disk transactions, in milliseconds) for the disk drive that was being used for the database log files. Here is an example:                     extended device statistics     r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 2053.6    0.0 8234.3  0.0  0.2    0.0    0.1   0  24 c3t60080E5...F4F6d0s0     0.0 2162.2    0.0 8652.8  0.0  0.3    0.0    0.1   0  28 c3t60080E5...F4F6d0s0     0.0 1102.5    0.0 10012.8  0.0  4.5    0.0    4.1   0  69 c3t60080E5...F4F6d0s0     0.0   74.0    0.0 7920.6  0.0 10.0    0.0  135.1   0 100 c3t60080E5...F4F6d0s0     0.0  568.7    0.0 6674.0  0.0  6.4    0.0   11.2   0  90 c3t60080E5...F4F6d0s0     0.0 1358.0    0.0 5456.0  0.0  0.6    0.0    0.4   0  55 c3t60080E5...F4F6d0s0     0.0 1314.3    0.0 5285.2  0.0  0.7    0.0    0.5   0  70 c3t60080E5...F4F6d0s0 Here is a little more information about my database configuration: The database and application server were running on two different SPARC servers. Storage for the database was on a storage array connected via 8 gigabit Fibre Channel Data storage and log file were on different physical disk drives Reliable low latency I/O is provided by battery backed NVRAM Highly available: Two Fibre Channel links accessed via MPxIO Two Mirrored cache controllers The log file physical disks were mirrored in the storage device Database log files on a ZFS Filesystem with cutting-edge technologies, such as copy-on-write and end-to-end checksumming Why would I be getting service time spikes in my high-end storage? First, I wanted to verify that the database log disk service time spikes aligned with the application server CPU drop outs, and they did: At first, I guessed that the disk service time spikes might be related to flushing the write through cache on the storage device, but I was unable to validate that theory. After searching the WWW for a while, I decided to try using a separate log device: # zpool add ZFS-db-41 log c3t60080E500017D55C000015C150A9F8A7d0 The ZFS log device is configured in a similar manner as described above: two physical disks mirrored in the storage array. This change to the database storage configuration eliminated the application server CPU drop outs: Here is the zpool configuration: # zpool status ZFS-db-41   pool: ZFS-db-41  state: ONLINE  scan: none requested config:         NAME                                     STATE         ZFS-db-41                                ONLINE           c3t60080E5...F4F6d0  ONLINE         logs           c3t60080E5...F8A7d0  ONLINE Now, the I/O spikes look like this:                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1053.5    0.0 4234.1  0.0  0.8    0.0    0.7   0  75 c3t60080E5...F8A7d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1131.8    0.0 4555.3  0.0  0.8    0.0    0.7   0  76 c3t60080E5...F8A7d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1167.6    0.0 4682.2  0.0  0.7    0.0    0.6   0  74 c3t60080E5...F8A7d0s0     0.0  162.2    0.0 19153.9  0.0  0.7    0.0    4.2   0  12 c3t60080E5...F4F6d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1247.2    0.0 4992.6  0.0  0.7    0.0    0.6   0  71 c3t60080E5...F8A7d0s0     0.0   41.0    0.0   70.0  0.0  0.1    0.0    1.6   0   2 c3t60080E5...F4F6d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1241.3    0.0 4989.3  0.0  0.8    0.0    0.6   0  75 c3t60080E5...F8A7d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1193.2    0.0 4772.9  0.0  0.7    0.0    0.6   0  71 c3t60080E5...F8A7d0s0 We can see the steady flow of 4k writes to the ZIL device from O_SYNC database log file writes. The spikes are from flushing the transaction group. Like almost all problems that I run into, once I thoroughly understand the problem, I find that other people have documented similar experiences. Thanks to all of you who have documented alternative approaches. Saved for another day: now that the problem is obvious, I should try "zfs:zfs_immediate_write_sz" as recommended in the ZFS Evil Tuning Guide. References: The ZFS Intent Log Solaris ZFS, Synchronous Writes and the ZIL Explained ZFS Evil Tuning Guide: Cache Flushes ZFS Evil Tuning Guide: Tuning ZFS for Database Performance

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• Webcast: Oracle Solaris 11 – Innovations for Your Datacenter

  - by Cinzia Mascanzoni

  Invite your partners to view this pre-recorded online event to learn how new advances in Oracle Solaris 11.1 can help them deliver a secure, scalable, mission-critical cloud. These three informative and practical sessions will also present the extended high-availability and disaster recovery capabilities of Oracle Solaris Cluster, Register now for the event and watch the Oracle Solaris 20th Anniversary video.

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• IM and SEO - Why You Need Them Both

  Internet Marketing, Social Marketing, SEO, all encompass the overall effort of online marketing. IM will not be effective without good solid SEO.

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• What's the most useful 10% of UML and is there a quick tutorial on it?

  - by Hanno Fietz

  I want my scribbles of a program's design and behaviour to become more streamlined and have a common language with other developers. I looked at UML and in principle it seems to be what I'm looking for, just way overkill. The information I found online also seems very bloated and academic. Is there a no-bullshit, 15-minutes introduction to the handful of UML symbols I'll need when discussing the architecture of some garden variety software on a whiteboard with my colleagues?

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• JDeveloper and ADF Satisfaction Survey - Need Your Input

  - by Shay Shmeltzer

  The JDeveloper & ADF team is looking to get feedback on your experience using JDeveloper and Oracle ADF. We developed a short online survey that will help us understand your usage patterns as well as locate the areas where we need to improve our product. Your input will be helping us help you. Please take 5 minutes to complete the survey - https://www.oraclesurveys.com/se.ashx?s=705E3EFC4861B8EF Thanks for helping, The JDeveloper team

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• Keyword 101

  Keywords are a vital key to your websites success and will attract you customers. People use keywords to find products or information online. If you use keywords correctly, they can take you to the top of search engines like Google for free giving you free targeted traffic that are interested in what you have to say or sell to them.

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• Square Peg Web: The Best Choice for Creativity and Innovative Designs and E-Commerce.

  A complete E-Service and web development agency is what Square Peg Web is all about. Everyone needs a website these days to showcase their products and sell them online. The days of having a regular ... [Author: Andrew Warren - Web Design and Development - June 18, 2010]

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• Webmarketing : Adobe complète sa solution d'optimisation de l'expérience client avec des modules pour les campagnes mobiles

  Adobe met à jour sa solution d'optimisation de l'expérience client Avec des modules pour les campagnes mobiles et l'intégration avec Adobe Online Marketing Suite Adobe annonce la disponibilité de sa nouvelle solution de gestion de l'expérience web (WEM : Web Experience Management), une avancée qualifié de « majeure » par l'éditeur pour sa plate-forme CEM (gestion de l'expérience client). WEM vise à optimiser la manière dont les entreprises créent des expériences multicanal au profit des ventes, des services et des interactions avec le client. La solution permet aux entreprises de tirer parti des derniers terminaux mobiles et des communautés « pour développer leur potenti...

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• Programming bots in games

  - by Bane

  I'm interested in how bots are usually written. Here's my situation: I plan to make an online 2D mecha game in HTML5, and the server-side will be done with node. It is intended to be multiplayer, but I also want to make bots in case there aren't enough players. How does my game logic see them, as players or as bots? Is there a standard by which I should make them? Also, any general tips and hints will be OK.

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• How to Make a Website For Free

  If you have an idea for a new website, but you don't feel like spending an arm and a leg having one built for you, don't. There are many websites online that you can access that will help you create a website of your own and won't charge you a dime for it. Most of these free website builders are willing to help you create a website for free because they then advertise on your website and generate revenues in that fashion.

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• Sending Free SMS Now Becomes Easy

  Online SMS is the latest buzz word in the town. If you are still spending huge chunks of your money for SMSing your colleagues and friends to wish them on special occasions, think twice. YouMint.com ... [Author: Pooja Singh - Computers and Internet - April 01, 2010]

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• Search Engine Optimization Success - The Best Way to Turn Your SEO Visitors Into Paying Customers

  One of the things that you have to make sure you do if you are trying to get more visitors to your site from the search engines is to make sure you can get them to buy from you. If you can't get your SEO visitors to buy from you, you'll end up wasting all your time and never make any money in your niche market. In this article I want to show you how you can turn your visitors into paying customers online.

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• SEO and new site - visibility best practices

  - by Ispuk

  Since i launched a new web site, i was wondering which are the best practices to let the visibility of the site grow up faster then just leaving the site online? I mean which internet channels are good to speed up visibility of a new site? Can anyone show some tricks he do when launching new site? I'm not talking about spam, advertising and SEO tech tips (the site is well done with all the main SEO tech tricks).

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• How Does a PC Virus Work?

  Surfing the web, using email, and gaming online are things you have probably done at some point. Most do them on a daily basis. Everyone has heard the term "computer virus" but don';t necessarily unde... [Author: Michele Wallace - Computers and Internet - May 21, 2010]

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• Know More About SEO Software

  SEO optimization is very essential to people who are looking for the current means to enhance the popularity of their sites on the internet. The SEO tool is one that delivers the success of your site and at the same time ensures that you get targeted traffic with ease. There is immense competition on the internet and it is for this reason why you should go in for SEO optimization so that you can have a winning edge over the other players in the online market.

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• A Bit Cloudy

  - by Chris Massey

  "Systems Administrators, I come in peace. You have nothing to fear from me" - Office 365 Microsoft Business Productivity Online Suite recently absorbed a few other services and has been rebranded as Office 365, which is currently in private Beta and NDA-d up to the eyeballs. As Microsoft's (slightly delayed) answer to Google Apps Premier Edition, it shows a lot of promise; MS has technical expertise, market penetration, and financial capital all going for it. On the other hand, Google...(read more)

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• What are the essential things one needs to know about UML?

  - by Hanno Fietz

  I want my scribbles of a program's design and behaviour to become more streamlined and have a common language with other developers. I looked at UML and in principle it seems to be what I'm looking for, but it seems to be overkill. The information I found online also seems very bloated and academic. How can I understand UML in plain-English way, enough to be able to explain it to my colleagues? What are the canonical resources for understanding UML at a ground level?

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• 25 Passwords to Avoid to Thwart Hackers

  SplashData, a vendor of smartphone productivity applications for consumers and businesses, recently released a list of the top 25 most commonly used passwords for 2011. The company compiled the list after analyzing files of stolen passwords that hackers posted online to share with their cybercriminal colleagues. Without further adieu, here is the list of passwords that made SplashData's top 25: password, 123456, 12345678, qwerty, abc123, monkey, 1234567, letmein, trustno1, dragon, baseball, 111111, iloveyou, master, sunshine, ashley, bailey, passw0rd, shadow, 123123, 654321, superman, qazwsx...

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