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• OTN Developer Days - Calgary, Alberta March 18 & Atlanta, GA April 1

  - by dana.singleterry

  Discover a Faster Way to Develop Ajax -Enabled Application Based on Java and SOA Standards Get Hands-on with Oracle Jdeveloper, Oracle Application Developer Framework and Oracle Fusion Middleware 11g. You are invited to attend Oracle Technology Network (OTN) Developer Day, a free, hands-on workshop that will give you insight into how to create Ajax-enabled rich Web user interfaces and Java EE-based SOA services with ease. We'll introduce you to the development platform Oracle is using for its Fusion enterprise applications, and show you how to get up to speed with it. The workshop will get you started developing with the latest versions of Oracle JDeveloper and Oracle ADF 11g, including the Ajax-enabled ADF Faces rich client components. Thursday, March 18, 2010 8:00 a.m. - 5:00 p.m. Calgary Marriott hotel 110 9th Avenue, SE Calgary, Alberta T2G 5A6 Wednesday, April 1, 2010 8:00 a.m. - 5:00 p.m. Four Seasons Hotel Atlanta 75 Fourteenth Street Atlanta, Georgia 30309 This workshop is designed for developers, project managers, and architects. Whether you are currently using Java, traditional 4GL tools like Oracle Forms, PeopleTools, and Visual Basic, or just looking for a better development platform - this session is for you. Get explanation from Oracle experts, try your hands at actual development, and get a chance to win an Apple iPod Touch and Oracle prizes. Come see how Oracle can help you deliver cutting edge UIs and standard -based applications faster with the Oracle Fusion Development software stack. At this event you will: * Get to know the Oracle Fusion development architecture and strategy from Oracle's experts. * Learn the easy way to extend your existing development skill sets to incorporate new technologies and architectures that include Service-Oriented Architecture, Java EE, and Web 2.0 * Participate in hands-on labs and experience new technologies in a familiar and productive development environment with Oracle experts guidance. Click on the Register Now Calgary, Alberta to register for the Calgary event and click on the Register Now Atlanta, GA to register for the Atlanta FREE events. Don't miss your exclusive opportunity to network with your peers and discuss today's most vital application development topics with Oracle experts.

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• Best of OTN - Week of August 10th

  - by CassandraClark-OTN

  Brief pubic service announcement before we get into the OTN community best of content for the week.... Four Bands. Three Epic Nights. Join Oracle for three evenings of entertainment and fun, all during Oracle OpenWorld and JavaOne, September 28-October 2, San Francisco. Learn More Architect Community Any discussion of the best of OTN must include the OTN ArchBeat Podcast. Consistently among the top 3 most popular Oracle podcasts, Archbeat focuses on real conversations with community members. Normally I pick the topics and the guest panelists for each program, but now you have a chance to take over that role and become a Guest Producer. In that role you'll pick the discussion topic and the panelists, while I do the all of the grunt work, allowing you to bask in the glory Want to know how to become an OTN ArchBeat Podcast Guest Producer? You'll find the details here: Yes, you can take over the OTN ArchBeat Podcast! And here are two examples of OTN ArchBeat Podcasts produced by community members: Data Warehousing and Oracle Data Integrator, from July 2013, was produced by Oracle ACE Director Gurcan Orhan, and features panelists Uli Bethke , Cameron Lackpour , and Michael Rainey . DevOps, Cloud, and Role Creep, from June 2013, was produced by Oracle ACE Director Ron Batra and features panelists Basheer Khan and Cary Millsap -- OTN Architect Community Manager Bob Rhubart Database Community OTN DBA/DEV Watercooler Blog - Did You Say "JSON Support" in Oracle 12.1.0.2?. -- OTN Database Community Manager Laura Ramsey Java Community The Java Source Blog - walkmod : A Tool to Apply Coding Conventions . Friday Funny: I was worried the #NSA might be spying on me Thanks, @pacohope. -- OTN Java Community Manager Tori Weildt Systems Community The OTN Systems Community HomePage- Find Great Resources for System Admins and Developers. -- OTN Systems Community Manager Rick Ramsey

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• Best of OTN - Week of May 25th

  - by CassandraClark-OTN

  Architect Community Podcast: Going Mobile - Developing Enterprise Mobile Apps This four-part OTN ArchBeat Podcast series is devoted to a discussion about bringing mobility to the enterprise, and how architects and developers can take advantage of the opportunities in the evolution of mobile application development. Video: Data Modeling and Moving Meditation with Kent Graziano Want to learn more about Kent's Kscope 2014 data modeling sessions and how Chi Gung can help you get a great start on your day? Check out this video interview. Video: Oracle ACE Director Stewart Bryson on OBIEE, ODI, GoldenGate In this interview Stewart talks about how OBIEE, ODI, GoldenGate and other technologies fit into his Kscope 2014 sessions, and about the sessions he plans to attend. Friday Funny from OTN Architect Community Manager Bob Rhubart:Even if you're not a person of a certain age, you need read A journey into my colon -- and yours, humorist Dave Barry's wildly funny 2008 account of his colonoscopy. Because one day you will be a person of certain age... Get involved in community conversations on the following OTN channels... OTN TechBlog The Java Source Blog The OTN Garage Blog The OTN ArchBeat Blog @oracleotn @java @OTN_Garage @OTNArchBeat @OracleDBDev OTN I Love Java OTN Garage OTN ArchBeat Oracle DB Dev OTN Java OTN ArchBeat

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• It's Not TV- It's OTN: Top 10 Videos on the OTN YouTube Channel

  - by Bob Rhubart

  It's been a while since we checked in on what people are watching on the Oracle Technology Network YouTube Channel. Here are the Top 10 video for the last 30 days. Tom Kyte: Keeping Up with the Latest in Database Technology Tom Kyte expands on his keynote presentation at the Great Lakes Oracle Conference with tips for developers, DBAs and others who want to make sure they are prepared to work with the latest database technologies. That Jeff Smith: Oracle SQL Developer Oracle SQL Developer product manager Jeff Smith (yeah, that Jeff Smith) talks about his presentations at the Great Lakes Oracle Conference and shares his reaction to keynote speaker C.J. Date's claim that "SQL dropped the ball." Gwen Shapira: Hadoop and Oracle Database Oracle ACE Director Gwen Shapira @gwenshap talks about the fit between Hadoop and Oracle Database and dives into the details of why Oracle Loader for Hadoop is 5x faster. Kai Yu: Virtualization and Cloud Oracle ACE Director Kai Yu talks about the questions he is most frequently asked when he does presentations on cloud computing and virtualization. Mark Sewtz: APEX 4.2 Mobile App Development Application Express developer Marc Sewtz demos the new features he built into APEX4.2 to support Mobile App Development. Jeremy Schneider: RAC Attack Oracle ACE Jeremy Schneider @jer_s describes what you can expect when you come to a RAC (Real Application Cluster) Attack. Frits Hoogland: Exadata Under the Hood Oracle ACE Director Frits Hoogland (@fritshoogland) talks about the secret sauce under Exadata's hood. David Peake: APEX 4.2 New Features David Peake, PM for Oracle Application Express, gives a quick overview of some of the new APEX features. Greg Marsden: Hugepages = Huge Performance on Linux Greg Marsden of Oracle's Linux Kernel Engineering Team talks about some common customer performance questions and making the most of Oracle Linux 6 and Transparent HugePages. John Hurley: NEOOUG and GLOC 2013 Northeast Ohio Oracle User Group president John Hurley talks about the background and success of the 2013 Great Lakes Oracle Conference.

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• dd clone hard drive: Input/Output Error though "chkdsk" says OK

  - by unknown (google)

  Hi, I've used dd to clone hard drives before using 'dd' and a live cd, but have run into a problem. The issue: dd fails with an "Input/Output Error" on /dev/sda3 , even though windows "check disk" (chkdsk) says it's ok. Context: Trying to replace my laptop hard drive w/ a faster one of the same size Laptop has NTFS on a 320gb hard drive Booting into knoppix Knoppix recognizes 'original' drive (/dev/sda) I am using a usb connection for ‘new' drive (irrelevant, but just an fyi) Knoppix recognizes the usb drive as /dev/sdb Using dd, as follows: dd if=/dev/sda of=/dev/sdb "dd" gives the I/O error above at 82Gb (out of 320Gb) I then tried checking each partition as follows and found it failed on /dev/sda3: dd if=/dev/sda1 of=/dev/null dd if=/dev/sda2 of=/dev/null dd if=/dev/sda3 of=/dev/null I have ran windows xp chkdsk on the offending drive in both "find only" and "find and fix" mode and it reports no errors Question How can I find and fix the error on my original hard drive partition (i.e. /dev/sda3) so that dd reads it successfully?

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• Linux DD command partition -to- partition

  - by Ben Jackson

  I just used the DD command to copy the contents of one partition over to another partition on another drive, like this: dd if=/dev/sda2 of=/dev/sdb2 bs=4096 conv=noerror sda2 partition was 66GB and sdb2 was 250GB. I read that by doing this the extra space on the drive I am copying to will be wasted, is this true? I wasn't worried about loosing the extra space for the time being however, I just ran: sudo kill -USR1 (PID) to view the current status of DD and it has written over 66GB of data, will it continue to write data until it gets to 250GB? If so, is there a way to stop the process without corrupting it as waiting for it to write blank space seems like a waste of time.

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• ?????????98!OTN???????????????

  - by atsuko.nishihata

  ???????????????????????????? ??????????????????????????? ????????? ??????????????????????????????·??? ?????????????????? ???? OTN???? ?????? ?????? ?????????????????????????????? ?????????????????????????OTN???? ?????? ?????? ????????????????????????????? ?????3??5???500???????????? ???????????????????????? ???98(????)???Oracle Database?????????!~?????????????Oracle Database?????!~ ???????????????????? ??98??????????????????????98???????????????????????????? ????????????????! ??????????? ????????????????????????(!!)???????????

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• 'dd' access to a drive

  - by John

  I've been working with making custom bootloader and kernel code (not necessarily Linux kernel). I'm putting the images on USB, and was using dd to place them on the sector they needed to be on, and I'm getting tired of burning the image to /dev/sda instead of /dev/sdb (effectively destroying my hard drive). So I was wondering if I could somehow give user access to the 'dd' command, but only to the /dev/sdb drive, so that if I accidentally type /dev/sda it won't let me, because I wouldn't have run the command as sudo or root.

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• OTN Developer Days (Review) - San Juan, PR - April 29, 2010

  - by dana.singleterry

  A quick update on the San Juan, PR event. First off it was a great success with the Keynote audience of 200+. Mickey Ralat, Managing Director Oracle Caribbean, kicked off the event with a quick introduction followed by me delivering the Keynote Message - The Fusion Development Platform which is the first session in the regular OTN DD events that we run in North America. Following this session was a partner, SDT, basically marketing their services which covers the Oracle stack and then following was a very brief presentation on APEX. After this we broke out into the various tracks of Java, (APEX) DB SQL Developer, .NET on Oracle. After the breakout we ran the following sessions in the Java track: Developing with JDBC, UCP, and Java in Database, Rich Internet Applications in Web 2.0, Development Made Simple Without Coding: Developing Reusable Business Components. As expected with the various tracks, we ended up with 50 - 70 in the various sessions within the JAVA track and the audience was very impressed with the power of JDeveloper/ADF 11g and we got a number of questions from licensing cost to upgrading / integrating from Forms. As for the Forms questions, I fielded a number of them and for those I couldn't, I pointed them towards Grants resources which seemed to suffice. They were all, for the most part, unaware of the recent 11.1.1.3 release which occurred only a couple of days prior to the event. The indication was that they were going to download it and use it for the lab that was included on the DVD which we did not have the time for them to even start on. For those of you that attended the event, you can download the updated presentations as follows: Keynote - The Fusion Development Platform Rich Internet Applications in Web 2.0 Development Made Simple Without Coding - Developing Reusable Business Components

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• Possibility of recovering files from a dd zero-filled hard disk

  - by unknownthreat

  I have "zero filled" (complete wiped) an external hard disk using dd, and from what I have heard: people said you should at least "zero fill" 3 times to be sure that the data are really wiped and no one can recover anything. So I decided to scan the disk once again after I've zero filled the disk. I was expecting the disk to still have some random binary left. It turned out that it has only a few sequential bytes in the very beginning. This is probably the file structure type and other headers stuff. Other than that, it's all zeros and nothing else. So if we have to recover any file from a zero filled disk, ...how? From what I've heard, even you zero fill the disk, you should still have some data left. ...or could dd really completely annihilate all data?

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• The Loneliest Road in America and the OTN Garage

  - by rickramsey

  Source I never told anyone how the image of the OTN Garage on Facebook came to be. I took the Facebook picture on Route 50 in Nevada, USA, in October of 2010. I was riding from Colorado to Oracle OpenWorld in San Francisco, so it was probably October. Route 50 is known as "The Loneliest Road in America." There are roads across Nevada that have even LESS traffic, but Route 50 still one. desolate. road. Although I have seen stranger things while riding along Nevada's Extraterrestrial Highway, I still run across notable oddities every time I ride Route 50. Like the old man with a bandolero of water bottles jogging along the side of the highway in the middle of the day, 50 miles from the closest town. First ultra-marathoner I'd seen in action. He waved at me. Or the dozen Corvettes with California license plates driving toward me, all doing the speed limit in the middle of nowhere because they were being tailed by half a dozen Nevada state troopers. #fail. I don't remember which town I was in, but I noticed the building when I stopped at the gas station. While standing there pouring fuel into the Harley, the store caught my eye. So I pulled the bike in front and walked inside. The owner is a little old lady, about 100 years old. Most of the goods she had on the shelves looked like they had been placed there during WWII. She was itty bitty and could barely see over the counter, but she was so happy when I bought a bar of Hershey's chocolate that she gave me a five cent discount. I took a few pictures and, when I got back, Kemer Thomson, who sometimes blogs here, photoshopped the OTN Garage and Oil Change signs onto it. The bike is a 2009 Road King Classic with a Bob Dron fairing and a Corbin heated seat. The seat came in handy when I rode home over Tioga Pass. The Road King is a very comfy touring bike with a great Harley rumble. I'm kinda sorry I sold it. When I stopped for fuel about 75 miles down the road at the next town, I peeled back the chocolate bar. I had turned into powder. Probably 50 years ago. - Rick Website Newsletter Facebook Twitter

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• Hot: Pre-built Developer VMs from OTN

  - by Justin Kestelyn

  For those of you who haven't already played with it, Oracle VM VirtualBox is an awfully cool desktop virtualization tool. Even better, it's free. We OTN-ers like it even more than you will though because it allows us to freeze-dry entire software stacks into VM images. Developers can simply download a few files, assemble them with a script we provide, and then import and run the resulting pre-built VM in VirtualBox. Voila, instant (insert name here) stack. These VMs are particularly handy in support of in-person workshops, but there's no reason we can't make them available for everyone. Which we have done, in Java, database, and SOA/BPM flavors. (All "ingredients" are listed at the referenced link, and they are extensive.) Now that we have the kinks worked out, other flavors are sure to become available in 2011. Now go get 'em!

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• PPTP VPN connection with dd-wrt terminates

  - by StalkerNOVA

  I have problems with connection to DD-WRT router with PPTP server installed. Win7 has no problems with connection to it. But in Ubuntu I'm getting all the time: Dec 28 21:52:14 IT-nb pppd[4209]: Plugin /usr/lib/pppd/2.4.5//nm-pptp-pppd-plugin.so loaded. Dec 28 21:52:14 IT-nb pppd[4209]: pppd 2.4.5 started by root, uid 0 Dec 28 21:52:14 IT-nb pppd[4209]: Using interface ppp0 Dec 28 21:52:14 IT-nb pppd[4209]: Connect: ppp0 <--> /dev/pts/2 Dec 28 21:52:18 IT-nb pppd[4209]: Connection terminated. Dec 28 21:52:18 IT-nb pppd[4209]: Exit.

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• OTN Newsletter 12????????????????????????!

  - by OTN-J Master

  OTN Newsletter 12????????????? OTN Newsletter????????????????????????????????????????????????????? ????Newsletter??????????????????????????????????????????????????????????????Candy???????????????????????????????????????”????”???????? OTN Newsletter?????????????????????????????????????????????????????????????????????????????????????????????????????????????????! >> OTN Newsletter???·????????

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• cannot ssh to computer behind a dd-wrt bridge

  - by Jayaraman

  In my home network , i have dd-wrt router in another room , which bridges wifi from main home router (linksys) to the computers wired behind dd-wrt router. Now I cannot ssh from my laptop ( connected to linksys wifi) to the computers behind dd-wrt wifi bridge. I am able to ping the individual computers behind the dd-wrt bridge. When it comes to ssh or telnet to the computers , it is blocked. What can I do to make dd-wrt bridge to open up all ports in the dd-wrt bridge ?

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• OTN Developer Day: Oracle Database 11g Application Development

  - by stephen.garth

  When and Where: Tuesday June 15, 2010 from 8:00 am - 5:30 pm Hyatt Regency Reston, Reston VA This full-day FREE event offers a great learning and networking opportunity. With support from Oracle database application development experts, you'll get valuable hands-on experience developing database-backed apps with the latest Oracle tools and frameworks. Oh yeah, you get to use your own notebook and download some cool and very useful materials. Find out more and register here. var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• Best of OTN - Week of Oct 21st

  - by CassandraClark-OTN

  This week's Best of OTN, for you, the best devs, dba's, sysadmins and architects out there!  In these weekly posts the OTN team will highlight the top content from each community; Architect, Database, Systems and Java.  Since we'll be publishing this on Fridays, we'll also mix in a little fun! Architect Community Top Content- The Road Ahead for WebLogic 12c | Edwin BiemondOracle ACE Edwin Biemond shares his thoughts on announced new features in Oracle WebLogic 12.1.3 & 12.1.4 and compares those upcoming releases to Oracle WebLogic 12.1.2. A Roadmap for SOA Development and Delivery | Mark NelsonDo you know the way to S-O-A? Mark Nelson does. His latest blog post, part of an ongoing series, will help to keep you from getting lost along the way. Updated ODI Statement of Direction | Robert SchweighardtHeads up Oracle Data Integrator fans! A new statement of product direction document is available, offering an overview of the strategic product plans for Oracle’s data integration products for bulk data movement and transformation, specifically Oracle Data Integrator (ODI) and Oracle Warehouse Builder (OWB). Bob Rhubart, Architect Community Manager Friday Funny - "Some people approach every problem with an open mouth." — Adlai E. Stevenson (October 23, 1835 – June 14, 1914) 23rd Vice President of the United States Database Community Top Content - Pre-Built Developer VMs (for Oracle VM VirtualBox)Heard all the chatter about Oracle VirtualBox? Over 1 million downloads per week and look: pre-built virtual appliances designed specifically for developers. Video: Big Data, or BIG DATA?Oracle Ace Director Ben Prusinski explains the differences.?? Webcast Series - Developing Applications in Oracle's Public CloudTime to get started on developing and deploying cloud applications by moving to the cloud. Good friend Gene Eun from Oracle's Cloud team posted this two-part Webcast series that has an overview and demonstration of the Oracle Database Cloud Service. Check out the demos on how to migrate your data to the cloud, extend your application with interactive reporting, and create and access RESTful Web services. Registration required, but so worth it! Laura Ramsey, Database Community Manager Friday Funny - Systems Community Top Content - Video: What Kind of Scalability is Better, Horizontal or Vertical?Rick Ramsey asks the question "Is Oracle's approach to large vertically scaled servers at odds with today's trend of combining lots and lots of small, low-cost servers systems with networking to build a cloud, or is it a better approach?" Michael Palmeter, Director of Solaris Product Management, and Renato Ribeiro, Director Product Management for SPARC Servers, discuss.Video: An Engineer Takes a Minute to Explain CloudBart Smaalders, long-time Oracle Solaris core engineer, takes a minute to explain cloud from a sysadmin point of view. ?Hands-On Lab: How to Deploy and Manage a Private IaaS Cloud Soup to nuts. This lab shows you how to set up and manage a private cloud with Oracle Enterprise Manager Cloud Control 12c in an Infrastructure as a service (IaaS) model. You will first configure the IaaS cloud as the cloud administrator and then deploy guest virtual machines (VMs) as a self-service user. Rick Ramsey, Systems Community Manager Friday Funny - Video: Drunk Airline Pilot - Dean Martin - Foster Brooks Java Community Top Content - Video: NightHacking Interview with James GoslingJames Gosling, the Father of Java, discusses robotics, Java and how to keep his autonomous WaveGliders in the ocean for weeks at a time. Live from Hawaii.  Video: Raspberry Pi Developer Challenge: Remote Controller A developer who knew nothing about Java Embedded or Raspberry Pi shows how he can now control a robot with his phone. The project was built during the Java Embedded Challenge for Raspberry Pi at JavaOne 2013.Java EE 7 Certification Survey - Participants NeededHelp us define how to server your training and certification needs for Java EE 7. Tori Wieldt, Java Community Manager Friday Funny - Programmers have a strong sensitivity to Yak's pheromone. Causes irresistible desire to shave said Yak. Thanks, @rickasaurus! To follow and take part in the conversation follow/like etc. at one or all of the resources below -  OTN TechBlog The Java Source Blog The OTN Garage Blog The OTN ArchBeat Blog @oracletechnet @java @OTN_Garage @OTNArchBeat @OracleDBDev OTN I Love Java OTN Garage OTN ArchBeat Oracle DB Dev OTN Java

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• Unable to configure DD-WRT SNMP monitoring with Zabbix

  - by Jien Wai

  Installed Zabbix on Ubuntu but not sure what setting I missed. Base on my concept, I would like to using SNMP to monitoring DD-WRT router which it using SNMP service. I did enable to SNMP service at DD-WRT router page. And also created a host at Zabbix with included DD-WRT template. After I done it I still unable to get any connection/information at Zabbix which mean the router doesn't communicate with Zabbix. The above picture is my DD-WRT's SNMP configuration. http://img13.imageshack.us/img13/2228/rhj2.png Also this is the Zabbix configuration which I have created the service to monitoring my DD-WRT router. http://imageshack.us/a/img853/7311/hlpr.png

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• DD-WRT with native IPv6

  - by Matt

  My ISP provides native IPv6 support (ie. I can plug in my computer straight into the WAN and get an IPv6 address). However I can not get this working on DD-WRT. When I enable IPv6 and radvd in DD-WRT, the router gets in IPv6 address, but the devices on my LAN do not. I tried looking at the DD-WRT wiki, but this only displayed instructions for tunneling or other methods where native support isn't available. I found a small amount of sites thorough searching, but none of the methods these sites described gave my computers each a global IPv6 address. In addition, SSHing into the router using ping6 on sites such as ipv6.google.com causes "host unreachable" errors. Has anyone using DD-WRT configured a successful setup with native IPv6? I am using a Netgear WNDR3700 v2, with DD-WRT build 17201

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• Using DD for disk cloning

  - by roe

  There's been a number of questions regarding disk cloning tools (yes, I did search for it) :) and dd has been suggested at least once. I've already considered using dd myself, mainly because ease of use, and that it's readily available on pretty much all run of the mill bootable linux distributions. To my question, what is the best way to use dd for cloning a disk. I don't have much time to go around, and no test-hardware to play with, so I need to be prepared, and it's pretty much a one-shoot chance to get it done. I did a quick google search, and the first result was an apparent failed attempt. Is there anything I need to do after using dd, i.e. is there anything that CAN'T be read using dd? Thanks!

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• Unable to configure DD-WRT SNMP monitoring with Zabbix

  - by Jien Wai

  Installed Zabbix on Ubuntu but not sure what setting I missed. Base on my concept, I would like to using SNMP to monitoring DD-WRT router which it using SNMP service. I did enable to SNMP service at DD-WRT router page. And also created a host at Zabbix with included DD-WRT template. After I done it I still unable to get any connection/information at Zabbix which mean the router doesn't communicate with Zabbix. The above picture is my DD-WRT's SNMP configuration. http://img13.imageshack.us/img13/2228/rhj2.png Also this is the Zabbix configuration which I have created the service to monitoring my DD-WRT router. http://imageshack.us/a/img853/7311/hlpr.png

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• Why dd finishes instantly when pipelining to cat?

  - by agsamek

  I start bash on Cygwin and type: dd if=/dev/zero | cat /dev/null It finishes instantly. When I type: dd if=/dev/zero > /dev/null it runs as expected and I can issue killall -USR1 dd to see the progress. Why does the former invocation finishes instantly? Is it the same on a Linux box? * Explanation why I asked such stupid question and possibly not so stupid question I was compressing hdd images and some were compressed incorrectly. I ended up with the following script showing the problem: while sleep 1 ; do killall -v -USR1 dd ; done & dd if=/dev/zero bs=5000000 count=200 | gzip -c | gzip -cd | wc -c Wc should write 1000000000 at the end. The problem is that it does not on my machine: bash-3.2$ dd if=/dev/zero bs=5000000 count=200 | gzip -c | gzip -cd | wc -c 13+0 records in 12+0 records out 60000000 bytes (60 MB) copied, 0.834 s, 71.9 MB/s 27+0 records in 26+0 records out 130000000 bytes (130 MB) copied, 1.822 s, 71.4 MB/s 200+0 records in 200+0 records out 1000000000 bytes (1.0 GB) copied, 13.231 s, 75.6 MB/s 1005856128 Is it a bug or am I doing something wrong once again?

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• Best of OTN - Week of August 17th

  - by CassandraClark-OTN

  Architect CommunityThe Top 3 most popular OTN ArchBeat video interviews of all time: Oracle Coherence Community on Java.net | Brian Oliver and Randy Stafford [October 24, 2013] Brian Oliver (Senior Principal Solutions Architect, Oracle Coherence) and Randy Stafford (Architect At-Large, Oracle Coherence Product Development) discuss the evolution of the Oracle Coherence Community on Java.net and how developers can actively participate in product development through Coherence Community open projects. Visit the Coherence Community at: https://java.net/projects/coherence. The Raspberry Pi Java Carputer and Other Wonders | Simon Ritter [February 13, 2014] Oracle lead Java evangelist Simon Ritter talks about his Raspberry Pi-based Java Carputer IoT project and other topics he presented at QCon London 2014. Hot Features in Oracle APEX 5.0 | Joel Kallman [May 14, 2014] Joel Kallman (Director, Software Development, Oracle) shares key points from his Great Lakes Oracle Conference 2014 session on new features in Oracle APEX 5.0. Friday Funny from OTN Architect Community Manager Bob Rhubart: Comedy legend Steve Martin entertains dogs in this 1976 clip from the Carol Burnette show. Database Community OTN Database Community Home Page - See all tech articles, downloads etc. related to Oracle Database for DBA's and Developers. Java Community JavaOne Blog - JRuby and JVM Languages at JavaOne!  In this video interview, Charles shared the JRuby features he presented at the JVM Language Summit. He'll be at JavaOne read the blog to see all the sessions. Java Source Blog - IoT: Wearables! Wearables are a subset of the Internet of Things that has gained a lot of attention. Learn More. I love Java FaceBook - Java Advanced Management Console demo - Watch as Jim Weaver, Java Technology Ambassador at Oracle, walks through a demonstration of the new Java Advanced Management Console (AMC) tool. Systems Community OTN Garage Blog - Why Wouldn't Root Be Able to Change a Zone's IP Address in Oracle Solaris 11? - Read and learn the answer. OTN Garage FaceBook - Securing Your Cloud-Based Data Center with Oracle Solaris 11 - Overview of the security precautions a sysadmin needs to take to secure data in a cloud infrastructure, and how to implement them with the security features in Oracle Solaris 11.

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• dd oflag=direct 5x fast

  - by César

  I have Centos 6.2 in server with this specs: 2xCPU 16 Core AMD Opteron 6282 SE 64GB RAM Raid controller H700 1GB cache NV - 2HD 74GB SAS 15Krpm RAID1 stripe 16k (OS Centos 6.2) sda - 4HD 146GB SAS 15Krpm RAID10 stripe 16k (ext4 bs 4096, no barriers) sdb -> /vol01 Raid controller H800 1GB cache nv - MD1200 12HD 300GB SAS 15Krpm RAID10 stripe 256k (For DB Postgres 8.3.18) (ext4 bs 4096, stride 64, stripe-width 384, no barriers) sdc -> /vol02 I'm benchmarking IO speed with dd, and view thah if in RAID10 12 disk exec: dd if=/dev/zero of=DD bs=8M count=10000 oflag=direct 10000+0 records in 10000+0 records out 83886080000 bytes (84 GB) copied, 126,03 s, 666 MB/s but if I remove "oflag=direct" option obtain about 80 MB/s. In read benchmark, results are similar: dd of=/dev/null if=DD bs=8M count=10000 iflag=direct 10000+0 records in 10000+0 records out 83886080000 bytes (84 GB) copied, 79,5918 s, 1,1 GB/s If remove iflag=direct obtain 150MB/s... I don't understand this huge differences, on other machines y don't have this behavior. Can I have some kernel parameter misconfigured? Thanks!

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• What does dd conv=sync,noerror do?

  - by dding

  So what is the case when adding conv=sync,noerror makes a difference when backing up an entire hard disk onto an image file? Is conv=sync,noerror a requirement when doing forensic stuff? If so, why is it the case with reference to linux fedora? Edit: OK, so if I do dd without conv=sync,noerror, and dd encounters read error when reading the block (let's size 100M), does dd just skip 100M block and reads the next block without writing something (dd conv=sync,noerror writes zeros to 100M of output - so what about this case?)? And if is hash of original hard disk and output file different if done without conv=sync,noerror? Or is this only when read error occurred?

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