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• Will I be abled to access 2nd HDD from dual-boot

  - by Ruben

  I'm planning to have a dual-boot on my computer. I have 2 physical hard drives, one 500GB and one 2TB. What I want to do, is have a dual-boot setup (2 partitions, both 50 GB) for Windows 8 and Windows 7. But will I be able to access the 3rd partition on the disk, or the other disk from both OSs? In this case, it would be really useful to access files and install programs, because I could use them on both OSs, as long as I have the same registry keys.

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• Unable to drag and drop / select multiple with mouse

  - by J. Scott Elblein

  I'm running into a perplexing issue with Windows 8 Pro x64, where randomly I'm unable to drag to select multiple files (i.e. in Explorer or Directory Opus). I've also noticed that a similar issue happens when I'm running for example Photoshop or Illustrator and can't drag to select multiple layers, or drag to do some other things in them. it happens randomly and have found no way to reliably reproduce it, but it happens VERY frequently. I have read some tips saying pressing the ESC button usually fixes the issue, but it doesn't in my case. From what I understand, it's probably due to some other process locking the drag feature somehow, but I've not found a way to tell which process is the perp; I've even tried using unlock software on files when I'm suddenly unable to drag and I'm told by it that nothing is locking it. Anyone have any ideas?

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• Got that Friday feeling?

  - by Rebecca Amos

  Saturday is just around the corner, and we’re all starting to wrap up for the weekend. If you’re the DBA that ‘Friday feeling’ might be as much about checking and preparing your SQL Servers for the next two days, as about looking forward to spending time with friends and family. Whether you’re double-checking your disaster recovery strategy, or know that it’s your turn to be on-call this weekend, it’s likely you’re preparing for the worst, just in case. The fact that you’re making these checks, and caring about both your servers and your users, means that you might be an exceptional DBA. You’re already putting in that extra effort to make other people’s lives easier. So why not take some time for your professional development and enter the Exceptional DBA Awards? If you’re looking for some inspiration for your entry, download our Judges’ Top Tips poster for advice on what the judges are looking for from this year’s entrants. Not only will you be boosting your professional development, but you could win full conference registration for the 2011 PASS Summit in Seattle (where the awards ceremony will take place), four nights' hotel accommodation, and a copy of Red Gate’s SQL DBA Bundle. So take some time out for yourself this weekend and get started on your entry: www.exceptionaldba.com

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• Ubuntu: Take actions when system temperature gets too high

  - by Josh

  One of the CPU fans on my Compaq Presario laptop running Ubuntu 9.10 seems to have bit the dust. The fan is deep within the case and I intend to replace the laptop in the next 6 months so it's not worth replacing it. I have the laptop on a cooling pad and most of the time the system is fine, CPU temps around 90°-110°F. Occasionally, however, I'm seeing random lockups which I believe is due to the system overheating. How can I configure the system to: Lower the CPU speed when the temperature reaches a certain level? (I.E. 110°F) Shutdown the system when the tempature reaches a critical level? (And what would that be? 130°?)

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• Software design of a browser-based strategic MMO game

  - by Mehran

  I wonder if there are any known tested software designs for Travian-like browser-based strategic MMO games? I mean how would they implement the server of such games or what is stored in database and what is stored in RAM? Is the state of the world stored in one piece or is it distributed among a number of storage? Does anyone know a resource to study the problems and solutions of creating such games? [UPDATE] Suggested in comments, I'm going to give an example how would I design such a project. Even though I'm not sure if I'm proposing the right one. Having stored the world state in a MongoDB, I would implement an event collection in which all the changes to the world will register. Changes that are meant to happen in the future will come with an action date set to the future and those that are to be carried out immediately will be set to now. Having this datastore as the central point of the system, players will issue their actions as events inserted in datastore. At the other end of the system, I'll have a constant-running software taking out events out of the datastore which are due to be carried out and not done yet. Executing an event means apply some update on the world's state and thus the datastore. As scalable as this design sounds, I'm not sure if it will be worth implementing. For one, it is pointless to cache the datastore as most of updates happen once without any follow ups. For instance if you have the growth of resources in your game, you'll be updating the whole world state periodically in which case, having incorporated a cache, you are keeping the whole world in RAM (which most likely is impossible). So can someone come up with a better design?

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• Paranoid Encryption

  - by Lord Jaguar

  Call me paranoid, but I really like to keep my stuff secret, but readily available on the cloud. So, asking this question. How safe and reliable is encryption software (e.g., truecrypt)? The reason I ask is that, what is I encrypt my data today with this software and after a couple of years, the software is gone ! What happens to my encrypted data? Is it equally safe to AES encrypt using 7-zip? Will it provide the same level or equivalent level of encryption as truecrypt or other encryption software? (I agree truecrypt will be better because of the container encryption it gives.) And what happens if 7-zip shuts down after 5 years? I am sorry if I am sounding paranoid, but I am coming back to my original question... Is there any application/software independent encryption? Meaning, can I encrypt with one software and decrypt with another so that I will not be dependent on just one vendor? I want my encryption to depend ONLY on the password and NOT on the encryption program/software? The next question, can I write my own program that does AES/stronger encryption when I give it a passphrase, so that I don't need to depend on third party software for encryption? If yes, which language supports the same? Can someone give me a heads up as to where to look for in case of writing my own encryption program?

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• How to proceed on the waypoint path?

  - by Alpha Carinae

  I'm using Dijkstra algorithm to find shortest path and I'm drawing this path on the screen. As the character object moves on, path updates itself(shortens as the object approaches the target and gets longer as the object moves away from it.) I tried to visualize my problem. This is the beginning state. 'A' node is the target, path is the blue and the object is the green one. I draw this path, from object to the closest node. In this case my problem occurs. Because 'D' node is more closer to the object than 'C' node, something like this happens: So, how can i decide that the object passed the 'D' node? Path should be look like this: One thing comes to my mind is that I use some distance variables between the two closest nodes in the route path. (In this example these are 'C' and 'D' nodes.) As the object approaches 'C' and moves away from the 'D' node at the same time, this means character passed the 'D'. However, I think there are some standardized and easy ways to solve this. What approach should I take?

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• Shared FC LVM VG with LVs for each KVM VM. Clvm required?

  - by Cocoabean

  I have 2 virtual machine hosts running Ubuntu 12.04 and KVM managed with libvirt. They are both connected to the same VG which is a LUN on my SAN over FC. I provision LVs on this shared VG for each VM. I don't think I need HA or failover, but I do want live migration between the hosts. Do I need clvm in this case? As long as I don't try to start the same VM on each host should this work? Clvm requires lots of overhead with clustering tools that I don't think I need. I can deal with manually restarting VMs on other hosts in the event of a hardware failure.

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• Is micro-optimisation important when coding?

  - by BozKay

  I recently asked a question on stackoverflow.com to find out why isset() was faster than strlen() in php. This raised questions around the importance of readable code and whether performance improvements of micro-seconds in code were worth even considering. My father is a retired programmer, I showed him the responses and he was absolutely certain that if a coder does not consider performance in their code even at the micro level, they are not good programmers. I'm not so sure - perhaps the increase in computing power means we no longer have to consider these kind of micro-performance improvements? Perhaps this kind of considering is up to the people who write the actual language code? (of php in the above case). The environmental factors could be important - the internet consumes 10% of the worlds energy, I wonder how wasteful a few micro-seconds of code is when replicated trillions of times on millions of websites? I'd like to know answers preferably based on facts about programming. Is micro-optimisation important when coding? EDIT : My personal summary of 25 answers, thanks to all. Sometimes we need to really worry about micro-optimisations, but only in very rare circumstances. Reliability and readability are far more important in the majority of cases. However, considering micro-optimisation from time to time doesn't hurt. A basic understanding can help us not to make obvious bad choices when coding such as if (expensiveFunction() && counter < X) Should be if (counter < X && expensiveFunction()) (example from @zidarsk8) This could be an inexpensive function and therefore changing the code would be micro-optimisation. But, with a basic understanding, you would not have to because you would write it correctly in the first place.

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• Application Launcher for Hyper-V Server

  - by peterchen

  We are currently in the process of setting up a HyperV R2 Server machine. Though there's not a lot we need to do wihtin the HyperV Server itself, the command line is sure minimalistic. There are a few administrative / Hardware Monitoring tools that we want to run on he machine itself (accessed through remote desktop). I am looking for a simple program/application launcher where we can hook up these maintenance tools (and one to open a new cmd.exe window in case I habitually close the one I'm working in!) However, all tools I tried by now more or less assume explorer is present, and fail in different ways. Before I go and write a simple one myself, any recommendations?

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• iSCSI: LUNs per target?

  - by badnews

  My question relates specifically to ZFS/COMSTAR but I assume is generally applicable to any iSCSI system: Should one prefer to create a target for every LUN that you want to expose? Or is it good practise to have a single target with multiple LUNs? Does either approach have a performance impact? And is there some crossover point where the other approach makes sense? The use case is for VM disks, where each disk (zvol) is a LUN. So far we have created a a separate target for each VM; but a single target that contains all the LUNs would probably greatly simplify management... but we may need hundreds of LUNs per a single target. (And then possibly tens of initiator connections to that target)

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• 2012 Oracle Fusion Middleware Innovation Awards Announced

  - by Tanu Sood

  Guest Contributor: Margaret Harrist. Originally posted on Oracle NewsCentral Companies from around the world were honored Tuesday for their innovative solutions using Oracle Fusion Middleware. This year’s 27 award winners, representing 11 countries and a wide span of industries, wowed the judges with a range of projects across eight product categories. A panel of judges scored each entry across multiple categories, including the uniqueness of their business case, business benefits, level of impact relative to the size of the organization, complexity and magnitude of implementation, and the architecture’s originality. In a general session just before the award presentation, Oracle Executive Vice President Hasan Rizvi highlighted a few of the winners’ original implementations, including Nike, Los Angeles Department of Water and Power, and Nintendo of America. Congratulations to the 2012 winners: Oracle Exalogic: Netshoes, Claro, UL, and Ingersoll Rand Oracle Cloud Application Foundation: Mazda Motor Corporation, HOTELBEDS Technology, Globalia, Nike, and Comcast Corporation Oracle SOA and Oracle BPM: NTT Docomo, Schneider National, Amadeus, and Motability Oracle WebCenter: News Limited, University of Louisville, China Mobile Jiangsu, Life Technologies Oracle Identity Management: Education Testing Service and Avea Oracle Data Integration: Raymond James and William Morrison Supermarkets Oracle Application Development Framework and Oracle Fusion Development: Qualcomm, Micros Systems, and Marfin Egnatia Bank Business Analytics (Oracle BI, Oracle EPM, Oracle Exalytics): INC Research, Experian, and Hologic

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• Ubuntu 12.04.3 64 bit with Nemo 2.0.x no thumbnails

  - by Dr. Szrapnel

  I have strange problem with thumbnails in my Ubuntu machine. I was using Ubuntu with Cinnamon 1.8 from stable ppa and it was good but then Cinnamon 2.0 came out with some broken packages uploaded to stable ppa nad things gone wrong... Anyway after few updates Cinnamon started to work normaly except Nemo - there are no thumbnails at all, only icons. I heve tried purging /.cache/thumbnails and .thumbnails folders but this doesn't work. Next I have changed permissions for those folders - that didn't helped either. Then I've set Nemo as default file manager and desktop handler but with no result. What is weird - when I start Nautilus and open some folder with images then close it and open same folder with Nemo thumbnails appears but when I clean thumbnails directories there are no thumbnails again. It would be great if someone have some solution for this annoying Nemo behavior because I really don't want to resign from Cinnamon. p.s. I have set preview options in Nemo for Always and no bigger files than 4GB so that is not the case.

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• GPL - what is distribution?

  - by Martin Beckett

  An interesting point came up on another thread about alleged misappropriation of a GPL project. In this case the enterprise software was used by some large companies who essentially took the code, changed the name, removed the GPL notices and used the result. The point was - if the company did this and only used the software internally then there isn't any distribution and that's perfectly legal under GPL. Modifications by their own employees for internal use would also be allowed. So At what point does it become a distribution? Presumably if they brought in outside contractors under 'work for hire' their modifications would also be internal and so not a distribution. If they hired an external software outfit to do modifications and those changes were only used internally by the company - would those changes be distributed? Does the GPL apply to the client or to the external developers? If the company then give the result to another department, another business unit, another company? What if the other company is a wholly owned subsidiary? ps. yes I know the answer is ask a lawyer. But all the discussion I have seen over GPL2/GPL3 distribution has been about webservices - not about internal use.

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• Configuring SMB shares in OS X

  - by Craig Walker

  I'm at my wit's end trying to control SMB file sharing on my Mac. (OS X 10.5 Leopard). I want to do something fairly simple: share a particular (non-home, non-Public) folder over my my SMB/Windows network with two users (accounts are local to my Mac), and share no other folders with anyone. The instructions on the internet are fairly straightforward: add the folders to be shared to the File Sharing panel of the Sharing System Preferences pane: ..and ensure that I'm sharing through SMB: However, when I actually try to connect via a SMB client (Windows XP in this case), the share does not appear. I see my home directory, "Macintosh HD", and my printers, but not the folder I just shared. I ensured that the underlying directory had the proper permissions (since this seems to affect share visibility) and that the "Shared Folder" checkbox was checked: ...but this didn't have any effect. I checked /etc/smb.conf but there was nothing obviously out of place there. I've also restarted smbd and rebooted. What else should I be looking for?

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• Can I list file names (or their parent directories) that were recently deleted using rm in OS X?

  - by Andrew Grimm

  Is it possible to find out which files and directories have recently been deleted by rm in OS X? Or failing that, is it possible to find which parent directories have had files or directories within it deleted? The OS version is Snow Leopard. Background: Last night, rvm (ruby version manager) did rm -rf of the ~/ruby directory from the home directory. (This bug has since been fixed) Ideally, I'd like to know what files within the ~/ruby directory were deleted, but failing that, I'd like to know if rvm deleted anything outside of ~/ruby . In case anyone's wondering about backups...: Just about everything within ~/ruby is a git project that has a remote repo, and I have a fairly recent Time Machine backup (only 20 days old).

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• upgrading my computer system for office use

  - by denise ellul

  Presently I have the under-mentioned computer system. What should be changed and upgraded with the following products that I own presently? I am interested in performance issues related to cache memory, bus speed, RAM, CAS latency as well as other considerations. Thanks for your help. Processor (CPU): Intel Celeron Dual Core E3300 2.5 GHz Motherboard: Asus P5QPL-AM G41 Main Memory (RAM): 2 GB Team Elite DDR2 PC8000 Case: Coolermaster RC330 Power Supply Unit: 500W EZ-Cool Standard Storage Device (Hard Drive): 500GB Samsung Video Card: Intel GMA X4500 (On-board) Optical Drive: LG GH22NS50 Sound Card: AC 97 (On – board) Card Reader: Akasa Black TFT Monitor: 19” View Sonic Speakers: Logitech S120 2.0

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• SQL Server Transaction Log RAID

  - by Eric Maibach

  We have three SQL Server servers, and each server has a about five or six databases on it. We are in the process of moving these servers to a new SAN and I am working on the best RAID configuration. Currently all of the log files for all of the databases share a RAID array, there is nothing else on this RAID array except for the log files, but all of the databases use this same array for their log files. I have read that it is best to have log files on separate disks. But in our case I am not sure whether it would be best to have one big array with about 8 drives that all the log files are on. Or would it be better to create four two disk arrays and give some of the larger databases their own dedicated disks for their log files?

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• What equipment do real ISP's use?

  - by Allanrbo

  In a dormitory of 550 residents, people often mistakenly set up DHCP servers for the whole network by plugging in their private Wi-Fi routers wrongly. Also recently, someone mistakenly configured their PC to a static IP being the same as that of the default gateway. We use cheap 3Com switches at the moment. I know that Cisco switches support DHCP snooping to solve the DHCP problem, but that still does not solve the default gateway IP takeover problem. What sort of switch equipment do real ISP's use so their customers cannot break the network for the other customers? What we ended up doing In case anyone are courious, we ended up doing seperate VLANs for each user. And as a matter of fact, not just the 550 users, but for 2500 users (11 dorms). Here's a page describing the setup: http://k-net.dk/technicalsetup/ (the section "Transparent firewall using VLANs"). There was no significant load on the router server as I feared in one of the comments below. Even at 800Mpbs.

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• Ubuntu won't suspend anymore, but it did upon install.

  - by Bruce Connor

  I fresh installed Ubuntu 10.10 back when it came out, and my laptop was suspending fine. All of a sudden, I can't get my laptop to suspend anymore. It's an HP Pavilion dv2-1110, but I don't think it's a hardware issue, here's why: It suspended fine upon first install. I haven't installed any new kernels since then, but I have installed tons of packages, so it's probably a package. The suspend and hibernate options disappeared from the shutdown menu. If I press my keyboard's suspend button (or if I close the lid) I get the following message: If I try the command pmi action suspend, I get the error message: Error org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Hal was not provided by any .service files. If I try the command echo -n mem > sudo /sys/power/state I get absolutely no output and no visible effect. What might be causing this behavior? I thought a list of installed packages might be useful, but it's huge and I don't know how to post it here in collapse/expand mode or something. EDIT:Just in case someone asks, none of the installed packages are kdm or anything like that (which would justify the lack of options in gnome's shutdown menu).

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• How can I prevent seams from showing up on objects using lower mipmap levels?

  - by Shivan Dragon

  Disclaimer: kindly right click on the images and open them separately so that they're at full size, as there are fine details which don't show up otherwise. Thank you. I made a simple Blender model, it's a cylinder with the top cap removed: I've exported the UVs: Then imported them into Photoshop, and painted the inner area in yellow and the outer area in red. I made sure I cover well the UV lines: I then save the image and load it as texture on the model in Blender. Actually, I just reload it as the image where the UVs are exported, and change the viewport view mode to textured. When I look at the mesh up-close, there's yellow everywhere, everything seems fine: However, if I start zooming out, I start seeing red (literally and metaphorically) where the texture edges are: And the more I zoom, the more I see it: Same thing happends in Unity, though the effect seems less pronounced. Up close is fine and yellow: Zoom out and you see red at the seams: Now, obviously, for this simple example a workaround is to spread the yellow well outside the UV margins, and its fine from all distances. However this is an issue when you try making a complex texture that should tile seamlessly at the edges. In this situation I either make a few lines of pixels overlap (in which case it looks bad from upclose and ok from far away), or I leave them seamless and then I have those seams when seeing it from far away. So my question is, is there something I'm missing, or some extra thing I must do to have my texture look seamless from all distances?

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• Extracting the layer transparency into an editable layer mask in Photoshop

  - by last-child

  Is there any simple way to extract the "baked in" transparency in a layer and turn it into a layer mask in Photoshop? To take a simple example: Let's say that I paint a few strokes with a semi-transparent brush, or paste in a .png-file with an alpha channel. The rgb color values and the alpha value for each pixel are now all contained in the layer-image itself. I would like to be able to edit the alpha values as a layer mask, so that the layer image is solid and contains only the RGB values for each pixel. Is this possible, and in that case how? Thanks. EDIT: To clarify - I'm not really after the transparency values in themselves, but in the separation of rgb values and alpha values. That means that the layer must become a solid, opaque image with a mask.

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• Suggested HTTP REST status code for 'request limit reached'

  - by Andras Zoltan

  I'm putting together a spec for a REST service, part of which will incorporate the ability to throttle users service-wide and on groups of, or on individual, resources. Equally, time-outs for these would be configurable per resource/group/service. I'm just looking through the HTTP 1.1 spec and trying to decide how I will communicate to a client that a request will not be fulfilled because they've reached their limit. Initially I figured that client code 403 - Forbidden was the one, but this, from the spec: Authorization will not help and the request SHOULD NOT be repeated bothered me. It actually appears that 503 - Service Unavailable is a better one to use - since it allows for the communication of a retry time through the use of the Retry-After header. It's possible that in the future I might look to support 'purchasing' more requests via eCommerce (in which case it would be nice if client code 402 - Payment Required had been finalized!) - but I figure that this could equally be squeezed into a 503 response too. Which do you think I should use? Or is there another I've not considered?

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• Snow Leopard, PHP, and MySQL

  - by Peter

  I have just installed Snow Leopard and now my PHP/MySQL program ends in a "Segmentation fault". I have been searching the web for a solution, I realize that there are some issues with SL/PHP/MySQL, but I have not found anything that works yet. I downloaded the binary MySQL package mysql-5.1.42-osx10.6-x86_64. I have updated the php.ini file as suggested at various posts. When I run PHP and connect to the MySQL server the behavior is a bit random. In many cases it works fine to connect and read data. In my specific case the PHP program constructs a LOAD DATA LOCAL INFILE ... statement to load data from a text file. It should do several such queries after each other in a loop. It works one time but the halts in a "Segmentation fault". The program worked fine in Leopard, but not now. My versions are: OS 10.6.2, PHP 5.3.0, MySQL 5.1.42

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• bluetooth daemon not running at startup

  - by ffaxer

  I'm trying to connect a bluetooth mouse to my Xubuntu system using Blueman (v. 1.21) Problem seems to be bluetoothd not running at startup, so blueman refuses to start, only a dialog appears: "Bluez daemon is not running, blueman-manager cannot continue." On my system, bluetoothd will run only as root (sudo), so my current workaround is simply to sudo bluetoothd manually, which works fine but id like to have it run at startup so that my mouse is just working without any interaction from me, if possible. If i try to start bluetoothd as non-root it reports: Bluetooth deamon 4.91 Unable to get on D-Bus In the startup scripts i found the same bluetoothd script in all runlevels and init.d: DAEMON=/usr/sbin/bluetoothd test -f /usr/sbin/bluetoothd || exit 0 # bluetoothd normally starts up by udev rules. it needs dbus to function, log_progress_msg "bluetoothd" pkill -TERM bluetoothd || true log_progress_msg "bluetoothd" I looked in /etc/udev/rules.d/ but no reference to bluetoothd. Further i have already tried with no luck: Editing /etc/dbus-1/system.d/bluetooth.conf to include my user (essentially copying the part that was for root): I tried it while both keeping the root policy and without, still, no luck! Editing /etc/pam.d/common-session and /etc/pam.d/gdm to include the line: session optional pam_ck_connector.so In the case of common-session it was already there but with a "nox11" which i tried removing. No luck no luck. Btw, I'm confused as to which session manager I'm using, since i have both xfce4-session and gdm-session-worker running. Anyways, hope someone is savvy enough to figure it out or bring some hints, otherwise i sincerely apologize for wasting your time! I'll sign off with uname -a: Linux [mycompname] 3.0.0-9-lowlatency #12ppa1~natty1-Ubuntu SMP PREEMPT Mon Aug 22 06:52:15 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux Peace B)

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