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  • What is the preferred pattern when attaching a 'runtime object'?

    - by sebf
    In my application I have the following: public class NeatObject { /* lots of static data, and configuration flags */ } public class NeatObjectConsumer { void DoCleverStuffWithObjectOnGPU(NeatObject obj); } Where NeatObject and its consumer are used to control the GPU. The idea being that, the configuration of an instance of NeatObject and its members, define how the consumer instance behaves. The object can be passed around, edited, and most importantly serialised/deserialised by the application, with and without knowledge of NeatObjectConsumer, then provided back to the consumer to do something else. The purpose of this seperation is: The consumer manages hardware resources, which change depending on the computer, and even on the execution of the application, making preserving the state of an object which does everything difficult. Avoids circular references if the assembly that contains the consumer needs to reference one that only needs to know about NeatObject. However, there is a complication in that the consumer creates hardware resources and needs to associate them with NeatObject. These don't need to be preserved, but still need to be retrieved. DoCleverStuffWithObjectOnGPU() will be called many, many times during execution and so any bottleneck is a concern, therefore I would like to avoid dictionary lookups. What is the preferred method of attaching this information to NeatObject? By preferred, I mean intuitive - other coders can see immediately what is going on - and robust - method doesn't invite playing with the resources or present them in such a way as to make them easily corruptible. Essentially, I want to add my own metadata - how should I do it? Try to use 'actual metadata' functionality like Reflection? A member of the type of an abstract class? Unmanaged pointers? If you took on a project that used this pattern, what would you have liked the previous developer to do?

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  • Where does Skype save its chat history & contacts?

    - by user4796
    I'm aware that there is a main.db file that is stored in a Windows directory. On XP: C:\Documents and Settings\<windows user>\Application Data\Skype\<username> But I just downloaded Skype onto my Android and noticed that all chats are sync'd. So to me, this suggests that the main.db file is not the only storage being used (because it is obviously not on my phone). Are contacts and chat history stored in my online Skype account? Does anyone know where I can find more information about this? I read this thread: Does skype automatically save chat history to the cloud? And how do you explain the sync'd chats?

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  • Unexpected "waiting for localhost"?

    - by Tenaar
    So I ran into something that kind of worried me today. Lately my computer has been kind of slow and I'm dealing with that, but today when I opened Facebook in Google Chrome, I noticed a message in the bottom left corner while it was loading the site that said "Waiting for localhost". It was brief and I managed to notice it because my computer is slower than it used to & it caused Chrome to hang briefly, long enough for me to read it. As I'm quite confident in that Facebook isn't running on my localhost, I'm wondering what could potentially make Chrome wait for localhost while I'm loading webpages from external servers. Is there a malware of some kind that I should be worrying about? Unfortunately I have no other information than this to go on, and I have no idea how to further investigate this, if it generated any logs or whatever. I'd appreciate any help in figuring out this matter!

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  • Windows xp keeps rebooting itself every morning at 8am?

    - by mark
    Hi, I've got windows xp sp3. It seems to restart itself every morning at 8am (judging by the windows logs, I can see all apps log a startup at 8am every day). Whenever I get to the machine in the morning (around 9 am) I see it's rebooted. I've checked that automatic updates are off, and that the power management settings are set to "always on". I'm not sure what else could be causing the machine to reboot, not sure where to start looking. Any ideas? Thanks ---------- update ---------------- Just looking at the Event Viewer, I see a log message at 8:00:47am every day, which looks like a reboot log statement: Microsoft (R) Windows (R) 5.01.2600 Service Pack 3 Multiprocessor Free. For more information, see Help and Support Center at ...

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  • Lightweight alternative to R for RHEL?

    - by Eric Rath
    I want to use R for some statistical analysis of logfile information, but found that even the "limited" R-core RPM has a lot of dependencies not already installed. I don't want to install so many packages for a peripheral need. Are there lightweight alternatives for simple statistical analysis on RHEL 6? I have an R script that accepts on stdin a large set of values -- one value per line -- and prints out the min, max, mean, median, 95th percentile, and standard deviation. For more context, I'm using grep and awk to find GET requests for a particular path in our webserver log files, get the response times, and calculate the metrics listed above in order to measure the impact on performance of changes to a web application. I don't need any graphing capabilities, just simple computation. Is there something I've overlooked?

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  • Auth failed running command from shell script

    - by CSchulz
    I try to run following command from shell script: svn checkout http://url/ --username user --password password --non-interactive --no-auth-cache . It fails always with following error: svn: OPTIONS of 'http://url/': authorization failed: Could not authenticate to server: rejected Basic challenge (http://url) Here the call out of my script: $(svn $command $url $auth --non-interactive --no-auth-cache .) Running the same command from the terminal works fine. What is the difference between running from shell script and terminal? EDIT: Here some version information: OS: Porteus 1.0 based on Slackware 13.3 Subversion: subversion-1.6.16-i486-1

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  • how to fight back attacks on my web service

    - by user12145
    My apache webservice is getting a large quantity of requests over the days, each one with somewhat random login to gain access. I identified about 60 such ips(a few sample below), all belong to google. is there a way to find more information about the origin of the attacker? or should I just block these ips. secondly, should I attempt to block the identified ips subnets(74.125.46.*) as a preventive measure? 72.14.194.65 64.233.172.20 74.125.75.19 72.14.194.33 74.125.46.87 74.125.44.91 74.125.46.91

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  • Windows failover cluster - virtual node with multiple Client Access Names

    - by mclaassen
    I recently encountered a customer environment in which they had failover cluster where one of the virtual nodes had more than one 'Client Access Name' (i.e. more than one IP address and DNS name for the single virtual node). Long story short we had to modify our software to deal with this situation, but we want to recreate the situation in house to test it before releasing. I have been unable to locate any information about how or why you would end up with a virtual node that has more than one access name. Does anyone know how I can set up a Windows failover cluster where a virtual node has more than one access name/IP?

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  • What is the best approach for deploying apps to companies

    - by Supercell
    What is the best approach for the following scenario: 1) A publicly available app (available in app stores) which is used by end users to make use of services offered by multiple companies. 2) These companies maintain their services also using a mobile app. I'm not sure on how to solve the second part. Having one app for both enduser and admin functionality, secured by username/password doesn't sound like a good idea. This would leave the only option of developing a separate admin application for the companies. What is the best approach to deploy "admin" like mobile apps to companies only, for Android, iOS and Windows Phone? Some additional information: Public App ---- Servers ----- Multiple Company Apps The public app shows all companies offering their services. An end user uses the public app to order something from a specific company. The order is sent to our servers. Our servers send the order to the associated company. This order is displayed on the company's admin app and given the option to accept the order.

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  • Question about server usage, big community platform [closed]

    - by Json
    Possible Duplicate: How do you do Load Testing and Capacity Planning for Web Sites I’m working on a community platform writen in PHP, MySQL. I have some questions about the server usage maybe someone can help me out. The community is based on JQuery with many ajax requests to update content. It makes 5 - 10 AJAX(Json, GET, POST) requests every 5 seconds, the requests fetch user data like user notifications and messages by doing mySQL queries. I wonder how a server will handle this when there are for more than 5000 users online. Then it will be 50.000 requests every 5 seconds, what kind of server you need to handle this? Or maybe even more, when there are 15.000 users online, 150.000 requests every 5 seconds. My webserver have the following specs. Xeon Quad 2048MB 5000GB traffic Will it be good enough, and for how many users? Anyone can help me out or know where to find such information, like make a calculation?

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  • Rescue data from damaged hard disk

    - by Lexsys
    Hello. I have a 500 GB hard drive with one NTFS-partition on it. I can mount it with Ubuntu and view the contents. But when I try to copy something, I get an I/O error. Ok, I tried to make its image with dd. I/O error as soon as it starts. I have installed ddrescue, but its manual page says not to use it with drives, failing on I/O. Can I manage to get some information from this drive and how to do this?

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  • Installing CURL on Ubuntu Karmic

    - by Racertim
    Trying to get this up and running: https://github.com/cloudnull/massupload I have everything except CURL installed and when I attempt to, it fails with the following: Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: curl 0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded. Need to get 196kB of archives. After this operation, 311kB of additional disk space will be used. WARNING: The following packages cannot be authenticated! curl Install these packages without verification [y/N]? y Err http://us.archive.ubuntu.com karmic/main curl 7.19.5-1ubuntu2 404 Not Found [IP: 91.189.91.13 80] Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/c/curl/curl_7.19.5-1ubuntu2_i386.deb 404 Not Found [IP: 91.189.91.13 80] Thank you!

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  • How does Google Chrome know my Firefox history if I never imported it?

    - by fdisk
    I have Firefox and Google Chrome installed in the same machine (Linux). It happens when I type something in Chrome Omnibox it suggests pages I have already visited in Firefox. I have never connected the accounts of both browsers I have never imported information from one browser to other I have never visited the suggested pages in Chrome The keyword I type in the omnibox is vague and there is no way it could guess the suggestion without having access to the Firefox history. i.e.: i type "ir" in Chrome and it suggests me the same Iron Maiden lyrics page I have browse before in Firefox. Thanks

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  • What happened to WinFS?

    - by Console
    The most interesting feature that was ever connected to what eventually became Vista was WinFS, a revolutionary (so it seemed, at least back then) new way of storing and accessing information on a computer. This feature was cut despite actually reaching a closed alpha/technical preview release. There was a smoke and mirrors blog post from MS about the technology living on in an upcoming SQL server release, but to me it just felt like it was axed, hard. Does anyone have any idea what happened to it? Is it killed, or just on the backburner? Was it just impossible to implement, too expensive, or did someone think of a better idea? Are there any projects (From MS or anyone else) that have similar goals?

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  • Wireless does not work 12.10

    - by superkoop
    My primary issue is that my wireless does not work after I installed 12.10. The output to rfkill list all: 5: hci0: Bluetooth Soft blocked: no Hard blocked: no The output to lshw -class network is: *-network description: Ethernet interface product: 88E8040 PCI-E Fast Ethernet Controller vendor: Marvell Technology Group Ltd. physical id: 0 bus info: pci@0000:09:00.0 logical name: eth0 version: 12 serial: 00:21:9b:d6:46:51 size: 100Mbit/s capacity: 100Mbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=sky2 driverversion=1.30 duplex=full ip=192.168.1.102 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:44 memory:fe8fc000-fe8fffff ioport:de00(size=256) *-network description: Network controller product: BCM4312 802.11b/g LP-PHY vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:0b:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=b43-pci-bridge latency=0 resources: irq:17 memory:fe7fc000-fe7fffff The output to lspci -nn for the pertinent information is: 0b:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01) Thus, it seems the solution would be to run: sudo apt-get install linux-headers-generic sudo apt-get install --reinstall bcmwl-kernel-source sudo modprobe wl However, I do not currently have access to an ethernet connection, as I am currently only able to use verizon wireless 3g internet. Thus, is there a way to set up ICS with a Vista machine so that I can access the internet by using the Vista machine as the host? Or, is it possible to fix this by downloading the important packages in vista and moving them to ubuntu via USB drive?

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  • BPM 11g Hands on Training

    - by mseika
    BPM 11g Hands on Training11-14 December 2012, Birmingham (UK) DescriptionThis free hands-on workshop covers the life cycle of a business process from analysis, modeling, simulation, process customization and monitoring using Oracle BPM Suite 11g. The process modeled in the workshop includes integrating with web services, creating complex human workflows with user interfaces for task forms and incorporating rule engine-based decision services. After taking this course on Oracle BPM Suite 11g, you can go onto build industry-focused solutions, customer-facing demos, proof-of-concepts (POCs), pilot implementations and reference architectures. REGISTER NOW Partner Registration Guide Price: FREE Address:Hockley Suite - Oracle OfficesBlythe Valley Business ParkShirley, SolihullWest Midlands B90 8ADUnited Kingdom 11 - 14 December 2012 You will also be able to extend your current SOA implementations with BPMN based business processes.You will have the opportunity to sit the BPM 11g Implementation Specialization exam at the end of the boot camp. The training will finish at 3pm on Friday 14th to allow time for the on-line exam to take place. AgendaThis workshop is 4 days long. 08:30 am: Arrival and sign-in09:00 am: Workshop begins 17:30 pm: Workshop ends (more detail to be provided) Workstation RequirementsAttendees must use their own laptops and it is essential they have the following:           · Minimum 8GB RAM. 40GB free disk space           · VirtualBox (latest version)           ·7zip (required for extracting the VirtualBox image) For more information please contact [email protected].

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  • Security Newsletter – September Edition is Out Now

    - by Tanu Sood
      The September issue of Security Inside Out Newsletter is out now. This month’s edition offers a preview of Identity Management and Security events and activities scheduled for Oracle OpenWorld. Oracle OpenWorld (OOW) 2012 will be held in San Francisco from September 30-October 4. Identity Management will have a significant presence at Oracle OpenWorld this year, complete with sessions featuring technology experts, customer panels, implementation specialists, product demonstrations and more. In addition, latest technologies will be on display at OOW demogrounds. Hands-on-Labs sessions will allow attendees to do a technology deep dive and train with technology experts. Executive Edge @ OpenWorld also features the very successful Oracle Chief Security Officer (CSO) Summit. This year’s summit promises to be a great educational and networking forum complete with a contextual agenda and attendance from well known security executives from organizations around the globe. This month’s edition also does a deep dive on the recently announced Oracle Privileged Account Manager (OPAM). Learn more about the product’s key capabilities, business issues the solution addresses and information on key resources. OPAM is part of Oracle’s complete and integrated Oracle Identity Governance solution set. And if you haven’t done so yet, we recommend you subscribe to the Security Newsletter to keep up to date on Security news, events and resources. As always, we look forward to receiving your feedback on the newsletter and what you’d like us to cover in the upcoming editions.

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  • Static vs. dynamic memory allocation - lots of constant objects, only small part of them used at runtime

    - by k29
    Here are two options: Option 1: enum QuizCategory { CATEGORY_1(new MyCollection<Question>() .add(Question.QUESTION_A) .add(Question.QUESTION_B) .add...), CATEGORY_2(new MyCollection<Question>() .add(Question.QUESTION_B) .add(Question.QUESTION_C) .add...), ... ; public MyCollection<Question> collection; private QuizCategory(MyCollection<Question> collection) { this.collection = collection; } public Question getRandom() { return collection.getRandomQuestion(); } } Option 2: enum QuizCategory2 { CATEGORY_1 { @Override protected MyCollection<Question> populateWithQuestions() { return new MyCollection<Question>() .add(Question.QUESTION_A) .add(Question.QUESTION_B) .add...; } }, CATEGORY_2 { @Override protected MyCollection<Question> populateWithQuestions() { return new MyCollection<Question>() .add(Question.QUESTION_B) .add(Question.QUESTION_C) .add...; } }; public Question getRandom() { MyCollection<Question> collection = populateWithQuestions(); return collection.getRandomQuestion(); } protected abstract MyCollection<Question> populateWithQuestions(); } There will be around 1000 categories, each containing 10 - 300 questions (100 on average). At runtime typically only 10 categories and 30 questions will be used. Each question is itself an enum constant (with its fields and methods). I'm trying to decide between those two options in the mobile application context. I haven't done any measurements since I have yet to write the questions and would like to gather more information before committing to one or another option. As far as I understand: (a) Option 1 will perform better since there will be no need to populate the collection and then garbage-collect the questions; (b) Option 1 will require extra memory: 1000 categories x 100 questions x 4 bytes for each reference = 400 Kb, which is not significant. So I'm leaning to Option 1, but just wondered if I'm correct in my assumptions and not missing something important? Perhaps someone has faced a similar dilemma? Or perhaps it doesn't actually matter that much?

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  • OpeVPN log connecting client IPs

    - by TossUser
    I looking for the best solution to log all connecting client's ip to either a text file or a database who logs into my VPN server. Under the IP I mean the public WAN IP on the internet where they are connecting from. A hack could definitely be to make the openvpn server log to a separate logfile and run logtail periodically to extract the necessary information. So the database I want to build would look like: Client_Name | Client_IP | Connection_date roadwarr1 | 72.84.99.11 | 03/04/14 - 22:44:00 Sat Please don't recommend me to use the commercial Openvpn Access Server. That's not a real solution here. If the disconnection date could be determined that would be even better so I could see how long a client was connected and from where! Thank you

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  • Can't delete folder in Windows 7

    - by user18526
    I'm trying to delete a folder in Windows 7 and get a perplexing error message: "Could not find this item: This is no longer located in G:\Graphics. Verify the item's location and try again. I can see the folder -- I can find it. I just can't delete it. I also get a second error message (sometimes) when I click on the folder: G:\Graphics 2009-11-17 refers to a location that is unavailable...this information might have been moved to a different location. I'm using Windows 7; this folder is on an external hard drive. I've emptied the folder (there were items in it); I've scanned that external hard drive for errors. Trying to rename the folder yields the same enigmatic error message. Is there a way to delete this folder?

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  • Why does my system slow down or freeze when there is heavy disk activity?

    - by user72270
    Im a first-time user to Ubuntu-12.04 with WUBI installation. My NoteBook Information : Dell vostro 3450 : i5 2410m, 3 gb ram, intel hd3000, amd 6630m hybrid. Surfing and playing games works flawlessly, however, I'm having huge problems when installing applications and generally copying and moving files. When doing so, system is significantly slower and freezes quite often (Firefox gets bluish, sometimes even black n white). I would say that Ubuntu allocates too much resources on file transfers and installing, but even these tasks are very slow. Here is very specific example : today, i tried to move 6 GB file from win 7 installation. It was good at first, i jumped to firefox but after a while firefox started to randomly turn bluish and mouse was randomly stopping working. It was gradually worse and worse and it got to a point when firefox black n whited and mouse wasn't working at all. I raged and went for some meal, when i got back screen was black. It probably unlogged me due to inactivity, when i pushed random button to bring screen to life i had to wait few minutes to let it show me only my screen background. No log in screen, just background and working mouse. NoteBook fan was working at 100 % so I assumed that file transfer was going on and I left it to work. Nothing then changed for a full hour so I hard rebooted it. File transfer unsuccessful, It transfered hardly 2 gigs. Is this normal ? What to do in these situations ? It didn't let me load system manager and not even terminal. Thanks.

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  • Check "Id3 Tag" integrity from mp3 (almost a "debug"). Is it possible?

    - by Somebody still uses you MS-DOS
    I'm using Mp3Tag do edit Id3 tags in my mp3 files. In the editor everything looks ok, but in my iTunes, some of them just ge messed up. The artist isn't read, Album Artist doesn't show up, this kind of thing. It's just random, some are messed up, some aren't. How do I "debug" this problem? How can I check what is written in my mp3 metadata, if possible, running all my mp3 in a batch (since I have 100gb)? How do I know if there are "garbage" in the metadata section along with information I correctly edited?

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  • designing solution to dynamically load class

    - by dot
    Background Information I have a web app that allows end users to connect to ssh-enabled devices and manipulate them. Right now, i only support one version of firmware. The logic is something like this: user clicks on a button to run some command on device. web application looks up the class name containing the correct ssh interface for the device, using the device's model name. (because the number of hardware models is so small, i have a list that's hardcoded in my web app) web app creates a new ssh object using the class loaded in step 2. ssh command is run and session closed. command results displayed on web page. This all works fine. Now the end user wants me to be able to support multiple versions of firmware. But the catch is, they don't want to have to document the firmware version anywhere becuase the amount of overhead this will create in maintaining the system database. In other words, I can't look up the firmware version based on the device. The good news is that it sounds like at most, I'll have to support two different versions of firmware per device. One option is to name the the classes like this: deviceX.1.php deviceX.2.php deviceY.1.php deviceY.2.php where "X" and "Y" represent the model names, and 1 and 2 represent the firmware versions. When a user runs a command, I will first try it with one of the class files, if it fails, i can try with the second. I think always try the newer version of firmware first... so let's say in the above example, I would load deviceX.2.php before deviceX.1.php. This will work, but it's not very efficient. But I can't think of another way around this. Any suggestions?

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  • Could 11.5 Million 401's be causing bottlenecks?

    - by roviuser
    I'm going to preface this with a warning: My knowledge about servers and networking is VERY limited, and if you provide me with technical answers, I probably won't understand much until I research your answer further. I'm trying to expand my knowledge and learn about it, though. If the information that I am able to provide in this question is insufficient to answer the question, I understand, and it can be closed. We have a SharePoint 2007 system that is extremely slow, mostly from huge amounts of use. We've been told that the main speed bottleneck is the access to the sql databases. However, they do provide a statistics dashboard, so I did some poking around, and noticed that we have 11.5 million or more 401 - access denied errors every month. Could this be causing major speed/performance decreases? Authentication for sharepoint uses active directory.

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  • Network(ing) to the Limit

    - by Oracle OpenWorld Blog Team
     By Karen Shamban While Oracle OpenWorld attendees are networking, there's an Oracle Global IT team that builds and maintains the massive networks that help run the show. The objective? To keep things running as seamlessly and smoothly as possible, constantly evaluate priorities, mitigate risk, and be ready for whatever might happen -- because things do happen when there are 50,000 plus attendees, tens of thousands of devices, unexpected requirements, and a constant flow of up-to-the-minute information. Here's just some of what it takes to keep the conference going, network style: 100 Oracle network, voice, and desktop engineers; security, risk management, and other IT experts, who come in from 17 countries  1000+ network switches 300+ miles of copper and fiber 485 wireless access points 2,500 wired laptops 300 VoIP phones And just where are all these networks and devices deployed? This is what the team had to build and manage: Moscone North, South, and West, including: The keynote hall Oracle DEMOgrounds in the Exhibition Halls Hundreds of session rooms Connection Centers, Social Avenue, Lounges Registration The Howard Street Tent and Taylor Street Cafe tented venues Oracle Square (Union Square) Yerba Buena Gardens Masonic Auditorium Sessions and demos at 8 hotel venues That's a whole lot of networking going on. And here's the kicker: the team has only 4 days to bring get it all up and running across these many venues, and exactly 12 hours to take it all down once the show ends. The Global IT team puts in the equivalent of 152 24-hour days for set-up, 227 24-hour days of support during the conferences, and then tears it all down in about 20 24-hour days. And in case you were wondering, the planning for next year's Oracle OpenWorld starts ... next week. No rest for the weary.  Now THAT's networking!  So hats off to the Global IT team -- the job ain't easy, but somebody's got to do it, and they do it remarkably well.

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