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• Mouse freezes for User Account but not guest session

  - by Rosie

  this question has been asked before but there wasn't an answer. The mouse on my computer freezes whenever I log in to my User Account, a few seconds after, just before the account opens. The keyboard still works, and programs seem to work as normal. If I log out, the mouse starts to work again. If I log in as a guest, the mouse works fine throughout. I have tried restarting, shutting down, which hasn't resolved the problem. Just after the problem started, I logged in as a guest and tried to open Firefox, but although I haven't logged in as a guest for ages, there was a message saying that Firefox couldn't be opened as it was already running. Could this have been in my main account? Do you know how I can unfreeze the mouse? Is it the same procedure that is recommended on other questions? I am extremely untechnical, and a friend did all the ubuntu installation. So a very detailed step by step would be appreciated if I have to use code to fix this.

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• Discrete Math and Computing Course

  - by ShrimpCrackers

  I was recently admitted into a Computing and Software Systems program (basically software engineering) and one of the first courses I'll be taking is called Mathematical Principles of Computing. The course description: "Integrating mathematical principles with detailed instruction in computer programming. Explores mathematical reasoning and discrete structures through object-oriented programming. Includes algorithm analysis, basic abstract data types, and data structures." I'm not a fan of math, but I've been doing well in all my math classes mostly A's and B's ever since I started two years ago, and I've been doing math every quarter - never took a quarter without math - so I've been doing it all in sequence without gaps. However, I'm worried about this class. I've read briefly on what discrete math is and from what my advisor told me, its connection with computer science is that it has alot to do with proving algorithms. One thing that my instructors briefly touched on and never went into detail was proving algorithms, and when I tried, I just wasn't very good at mathematical induction. It's one of the things that I ignored every time it showed up in a homework problem (usually in Calculus III which I'm finishing up right now). Questions: 1. What can I expect from this class? 2. How can I prepare myself for this class? 3. Other tips? Thank you.

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• How to convert WinXP + Apps on RAID0 to use just one of the two RAID disks?

  - by chris5gd

  I have two 150GB SATA drives in hardware RAID 0, on which I have my C: (Win XP) and D: (installed apps). I'm migrating to Windows 7, but I want to keep my XP system until I've got it all running smoothly. So I want to: break the RAID move C: and D: to one of the drives (there's enough room) use the other drive for Win 7 boot into one or the other Clearly I can't move C: and D: after breaking the RAID, so I'm assuming I need to image the two partitions first, then break the RAID and restore the images to one of the drives. So my questions are: Is this possible? If so, what would be a good (free) imaging/restore tool? How do I ensure that the drive will boot after restoring the images? What sort of gotchas should I look out for? If there's a better solution than this, I'd be grateful for suggestions. Thanks!

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• Transfer disk image to larger/smaller disk

  - by forthrin

  I need to switch the hard drive on a 2006 iMac to a new SSD. I don't have the original installation CDs. I know I can order CDs from Apple, but this costs money. Someone told me it's possible to rip the image of the old drive and transfer to the new drive. If so, does the size of the new drive have to be exactly the same as the old? If not, my questions are: Is it possible to "stretch" the image from 120 MB disk to a 256 MB disk (numbers are examples)? If so, what is the command line for this? Likewise, is it possible to "shrink" an image from a larger disk (eg. 256 MB) to a smaller disk (eg. 120 MB), provided that the actual space used on the disk does not exceed 120 MB? How do you do this on the command line?

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• Has the emerging generation of programmers got the wrong idea about design patterns? [closed]

  - by MattDavey

  Over the years I've noticed a shift in attitude towards design patterns, particularly amongst the emerging generation of developers. There seems to be a notion these days that design patterns are silver bullets that instantly cure any problem, a proliferating idea that advancing as a software engineer simply means learning and applying more and more patterns. When confronted with a problem, developers no longer strive to truly understand the issue and design a solution - instead they simply pick a design pattern which seems to be a close fit, and try to brute-force it. You can see evidence of this by the many, many questions on Stack Overflow that begin with the phrase "what pattern should I use to...". I fall into a slightly more mature category of developers (5-10 years experience) and I have a very different viewpoint on patterns - simply as a communication tool to enhance clarity. I find this perspective of design patterns being lego bricks (collected like pokemon cards) a little disconcerting. Will developers lose this attitude as they gain more experience in software engineering? Or could these notions perhaps steer the direction of our craft in years to come? Did the older generation of developers have any similar concerns about us? (perhaps about OO design or similar...). if so, how did we turn out?

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• How do I know if my disks are being hit with too much IO reads or writes or both?

  - by Mark F

  Hi All, So I know a bit about disk I/O and bottlenecks relating to this especially when relating to databases. But how do I really know what the max IO numbers will be for my disks? What metric might be available to me for working out roughly (but needs to be a good approximation) of how much capacity (if you will) have I got left available in I/O. I've seen it before where things are bubbling along nicely and then all of a sudden, everything screams to a halt, and it ends up being an IO bound problem. Is there a better way to predict when IO is reaching its limits? This article was interesting but not giving the answer I desire. "http://serverfault.com/questions/61510/linux-how-can-i-see-whats-waiting-for-disk-io". So is my best bet surrounding just looking at 'CPU IO WAIT'? There must be a more reactive method for this? Best, M

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• OBIEE Capacity Planning

  - by THE

  I can not even recall how many times I was asked by a customer what size the machine should be bought to run our Software. Unfortunately Tech Support is not even the right address to answer that question, as a purchase decision is closely tied to the answer. Hence, Tech Support has been limited to the answer: "The biggest machine you can afford" . Many Customers were unhappy with that and have tried to get us to be more precise and that causes a lot of explanation and lengthy discussion. In the end no one is wiser or happier.  Therefore I am happy to report that at least for OBIEE the decision has just been made a whole lot easier. Have a look at the note Oracle BI EE 11g Architectural Deployment: Capacity Planning (Doc ID 1323646.1) The document attached to that note gives you a good overview for teh sizing of the machines that Oracle recommends to run OBIEE (be it a small installation or a bigger distributed installation) If you have any more questions about this topic and what machines we recommend, then get in contact with  Oracle Consulting or speak to your sales representative.

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• Tips for Making this Code Testable [migrated]

  - by Jesse Bunch

  So I'm writing an abstraction layer that wraps a telephony RESTful service for sending text messages and making phone calls. I should build this in such a way that the low-level provider, in this case Twilio, can be easily swapped without having to re-code the higher level interactions. I'm using a package that is pre-built for Twilio and so I'm thinking that I need to create a wrapper interface to standardize the interaction between the Twilio service package and my application. Let us pretend that I cannot modify this pre-built package. Here is what I have so far (in PHP): <?php namespace Telephony; class Provider_Twilio implements Provider_Interface { public function send_sms(Provider_Request_SMS $request) { if (!$request->is_valid()) throw new Provider_Exception_InvalidRequest(); $sms = \Twilio\Twilio::request('SmsMessage'); $response = $sms->create(array( 'To' => $request->to, 'From' => $request->from, 'Body' => $request->body )); if ($this->_did_request_fail($response)) { throw new Provider_Exception_RequestFailed($response->message); } $response = new Provider_Response_SMS(TRUE); return $response; } private function _did_request_fail($api_response) { return isset($api_response->status); } } So the idea is that I can write another file like this for any other telephony service provided that it implements Provider_Interface making them swappable. Here are my questions: First off, do you think this is a good design? How could it be improved? Second, I'm having a hard time testing this because I need to mock out the Twilio package so that I'm not actually depending on Twilio's API for my tests to pass or fail. Do you see any strategy for mocking this out? Thanks in advance for any advice!

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• &quot;The protocol 'net.msmq' is not supported.&quot;

  - by John Breakwell

  The “Lessons Learned” blog has an update covering the error message "The protocol 'net.msmq' is not supported." "The protocol 'net.msmq' is not supported." OMG, a new lesson! Will wonders never cease? So I ran into an interesting issue setting up a WCF service to consume an MSMQ queue. I won't bother you with the details of how to actually build a WCF/MSMQ service; there are plenty of tutorials on the subject. I want to share with you an interesting error that I ran into and the surprisingly simple fix. The error occurs when attempting to generate a Service Reference or even simply browsing to the WSDL of your WCF/MSMQ service in the form of a YSOD with the following error: "The protocol 'net.msmq' is not supported." After a lot of Googling on the subject turning up plenty of questions with the same error but no answers. So I went digging into some application level config files on a server that already had a WCF/MSMQ service successfully set up by the network admin, and the answer was amazingly simple: If you are hosting an MSMQ/WCF service in IIS, you have to tell IIS to allow net.msmq protocol. It's in the advanced settings for the application or site in which you are hosting the service. .... aaaand, that's it.

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• several hard drives and partitions

  - by Tim

  If there are two physically separate hard drives, should they be treated as two pre-defined partitions? If yes: should they be treated as two primary partitions (including one or two of them can become extended partition(s) and be further subdivided into logical partitions)? Or they (or one part of each) can be treated as two logical partitions of a extended partition? Thanks! I intended to ask if there can be a primary/logical partition that are partially on both hard drives? And if there can be a logical partition on a hard drive and another logical partition on another hard, and the two logical partitions belong to the same extended partition? I guess the answers to both questions are no?

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• external usb hard drive is not being seen anymore

  - by incrediblehulk

  I think my problem is a little different than several other similar titled questions. Everything started while I was using 10.10. External drive was always recognized and mounted, but the timing of this differed. I mean when I booted, the OS sometimes saw the drive immediately, sometimes after a few minutes, sometimes after hours. Although this was annoying, I tolerated this somehow. Then this problem persisted after I upgraded to 11.04 with a clean install. Afterwards, the drive became totally invisible to the OS. It is not even detected as an usb device anymore. However, there is one thing I can do to make it seen. If I boot to another operating system which can detect the drive, and then boot back to ubuntu, everything is perfect. but this is of course very impractical. To summarize, the usb drive is recognized by ubuntu if and only if another OS in the same computer could recognize it first. I should also say I have not had any problems with the same drive in any other OS or a different computer. My drive is philips with a hitachi hdd inside, has its own power source and any other usb powered drives have never caused this kind of a problem. I've tried almost all recommendations in similar topics but none of them seems to be related to this one. What can I possibly do to fix this?

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• Restoring exchange 2003 from a backup

  - by user64204

  Hi all, I'm restoring an Exchange server from a backup: [1] the backup was created on 19/12/2010 [2] the server kept running until 20/12/2010 [3] we're restoring the server today 21/12/2010 with the backup from [1] My understanding is that when the server comes back: [4] whatever is in users' inbox since [1] will be deleted. [5] whatever is in users' sent box since [2] should be re-sent. [6] As a safety measure we've moved all emails sent/received between [1] and [3] to .PST files. Questions: -are [4] & [5] statements correct? -is there any way to move back emails from the PST file [6] to the current inbox/sent folders so that Exchange takes these emails into account (instead of deleting them)? -what happens to the Calendar items that were added after [1], is there any way to back those up as well if needed? Many thanks

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• Tweaking "Most visited sites" button in Firefox

  - by Mehper C. Palavuzlar

  It is sometimes practical to use "Most Visited" sites which stands on the left hand side of Firefox window. When I click on it, I can see maximum 10 URLs. At that point, I have 2 questions: Is it possible to increase the number of maximum most visited sites (say, 30)? Let's say example.com is one of the most visited domains. In the most visited list, there are other pages from this domain, like example.com/intro, example.com/info, example.com/help etc. So those sub-addresses are also in the list, but I just want to see max 1 (or maybe 2) pages from the same domain in the list. Is it possible to arrange the list this way?

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• Multi-machine backup solutions

  - by Paul

  I have a growing number of PCs and laptops in my home that need a backup solution. My question is 2 fold: Most commercial backup vendors appear to license by the machine, are there any products that give a license that can be used on all your machines, without a per machine cost? An alternative is to have a centrally controlled back up strategy controlled from a single PC with an attached hard drive that can back up other machines on the network. What backup software is suitable for this approach? Will this software be windows/Linux interoperable? I've searched for duplicate questions but don't see anything that addresses the multi machine/cost issue. OSs in network will be Windows (XP, Vista, 7) and Linux variants. Not pattern to when machines will be switched on.

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• Started an application through SSH, command line now gone, what happens next?

  - by Chris Dutrow

  Context: This is a very basic question Using Putty and SSH for the first time to do some serious server setup and run into the situation where I have started a process that I do not want to stop. The process is the gunicorn WSGI HTTP Server (running on Centos 6.3). The command I used to start the process is (as per their Quick Start): gunicorn -w 4 myapp:app At this point in the work session, I have lost the command prompt. This must be such a non-issue that it doesn't even enter into an experienced user's consciousness. But unfortunately at my level of experience, I am left with several fundamental questions: Does the fact that I have lost the command prompt mean that the process is still running? How do I get back to the command prompt without killing the process? How do I come back and monitor the process later? How do I eventually kill the process? Any help is appreciated, thanks so much!

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• In C++ Good reasons for NOT using symmetrical memory management (i.e. new and delete)

  - by Jim G

  I try to learn C++ and programming in general. Currently I am studying open source with help of UML. Learning is my hobby and great one too. My understanding of memory allocation in C++ is that it should be symmetrical. A class is responsible for its resources. If memory is allocated using new it should be returned using delete in the same class. It is like in a library you, the class, are responsibility for the books you have borrowed and you return them then you are done. This, in my mind, makes sense. It makes memory management more manageable so to speak. So far so good. The problem is that this is not how it works in the real world. In Qt for instance, you create QtObjects with new and then hand over the ownership of the object to Qt. In other words you create QtObjects and Qt destroys them for you. Thus unsymmetrical memory management. Obviously the people behind Qt must have a good reason for doing this. It must be beneficial in some kind of way, My questions is: What is the problem with Bjarne Stroustrups idea about a symmetrical memory management contained within a class? What do you gain by splitting new and delete so you create an object and destroy it in different classes like you do in Qt. Is it common to split new and delete and why in such case, in other projects not involving Qt? Thanks for any help shedding light on this mystery!

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• Switching To Ubuntu 14.04 from Windows 8.1

  - by Asangam

  everyone i am newto these linux stuffs. Currently i'm a user of Windows8.1 . When windows 8 was roling out i was like i'm never going to leave and will be always stick to windows8 but now i think it's time to switch linux because being in windows forever i don't think i can do something very good .I wanted to be OpenSource :) . So i really dont have any idea about linux . For me the best distro is Ubuntu and Kubuntu offcourse the latest release . So what i'm afraid of switching to linux is its compability .The compatibility i'm talking about is with the hardware's and driver's . For eg sometime after fresh install of windows we need to install the display,usb and wifi drivers to function . For some computer or brands those driver's are hard to find and i can't even think of linux how hard are they to find if it needs installing drivers. So my main question is that do i need to install the drivers for my wifi adapters display and some other stuffs or the distro i choosed i.e Ubuntu 14.0.4 consists of those dirvers and what about the 64 and 32bit . My machines is 64bit aso do i need to install the 64bit one . I mean i know the advantages of installing the 64 bit one but like windows is it kinda hard to find softwares for the 64 bit one . Or the 32 bit is recommended . And Yes I will be highly appreciated for the answers to my questions . Thank You :)

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• Most efficient hard drive configuration for multitasking system

  - by user99391

  I hope I didn’t screw up the tile. Currently I’m using for my system 2x500g Raid0 system. I’m thinking about an upgrade but I got hold up by few questions. I need at least 100-120 gb for my system and apps and looking for a technological upgrade also. I've end up with 3 choices. Single 120 ssd (sata 6 drive) 2x60 ssd drives, but I've heard it's not possible. PCI ssd drive (~120gb). They all have very similar read/write values and prices but I was wondering if anyone could give some tips on which way to go. I run win7x64 and do a lot of multitasking(especially adobe stuff).

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• How can I have two web roots on one server, so I can point two domains to two different roots?

  - by Daniel F. Dietzel

  I usually ask my n00b questions on Stack Exchange, but now I'm setting up a VPS and have a question. My usual site.com points to my VPS's IP xxx.xxx.xxx.xxx. Now I have a different domain, and I'd like to point that to another location, say xxx.xxx.xxx.xxx/myname. However, when I try to add that as an "A" record in the DNS settings it won't let me. FYI I'm using chicagovps.net with ubuntu 11.10 and Nginx. Thanks!

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• Drive still usable if Seatools reports errors?

  - by Rob

  I have a Seagate 3TB Expansion Desktop drive that was part of a Linux RAID 6 array that failed. I eventually did a zero fill both through Seagate DiscWizard and via Linux dd, neither reported errors. When I ran Seatools now, I got: Short DST - Started 5/31/2014 10:04:36 PM Short DST - Pass 5/31/2014 10:05:37 PM Long Generic - Started 5/31/2014 10:15:19 PM Bad LBA: 518242762 Not Repaired (whole bunch of bad LBAs ommited) Bad LBA: 518715255 Not Repaired Long Generic Aborted 6/1/2014 3:12:18 AM i.e. the short test passed, the long test failed. Unfortunately, the drive is out of warranty, so I can't just RMA it. But I hate tossing a drive that can still be used. So, my questions are: If the zero fill succeeded, and the short test passed, can I still use the whole drive? if not, since I'm using LVM on top of RAID, is there a way to tell either of these to just skip the bad area? If not the above, can I just create partitions before and after the part of the drive with the bad LBAs?

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• Automatic repair software

  - by ADOConnection

  Do anyone knows any kind of apps or services for "taking care of servers"? (besides managed servers) There are hundreds of ways your server or application can stop working properly. Small things are easy to miss but usually easy to fix. Log overgrouth, configuration issues, etc. Of course there are best practice checklists, but its not a human task to check configuration best practices. Im sure it can be automated: some kind of agent can monitor all system settings, say what is right and wrong and give suggestions on how to make it right. I have to admin several servers and I need some kind of overview of overall situation. As well as a tool, that will fix problems automatically. Can you people suggest something? (I know its a little bit out of rules of SF, but I think this particular question is quite specific) It would be great to have something like http://stackoverflow.com/questions/1451319/asp-net-mvc-view-engine-comparison but for automation software.

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• What do you feel are characteristics of a mature programmer?

  - by blparker

  Hey all. As part of ongoing research that I am conducting, I would like to ask a crowd, that I feel is the most qualified, to answer a question. What does the community feel are characteristics of a mature programmer? I'm not asking the question because I'm looking to hire or anything of that nature. A colleague and I repeatedly hear a trend throughout universities and specifically computer science departments. The students generally ask questions of the form: How can I become a mature programmer? How can I become a world class programmer? What steps should a new programmer take to become more skilled? So, with that, we are conducting research to attempt to identify an optimized path that would allow an introductory programmer to advance to that of a skilled/mature programmer. Now, I understand that there are many "it depends" out there depending on what vertical industry one works in, but I feel we can determine many common characteristics irrespective of the industry. Any thing you can offer is greatly appreciated. Thanks.

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• Cannot connect to Internet via Wifi

  - by lvogel

  I have a laptop that's currently configured as a dual-boot. The problem: I cannot connect to the Internet in the home wireless network through Ubuntu in the apartment where I currently live. The strange part: I can connect to it just fine through Windows (as right now), and I can use the Internet through Ubuntu on this computer with all the other wireless networks I have tried. The problem is only with this particular combination. The only possible explanations I can think of are either that this network is WPS, or that it's a driver problem--Vodafone router. The router 'sees' the computer--and it says it's connected; however, I keep getting prompted for a password, and I enter the key that works with Windows, but in Ubuntu it just keeps asking for it repeatedly, and I can't access the Internet. I don't have an ethernet cable at the moment, but if someone would be so kind as to ask me questions I will gladly answer, and if you have suggestions, I will do them--the only thing is, I am subletting this apartment from someone who is away on vacation, so I don't want to screw with the router settings unless I know what I'm doing! - I do not have Wicd - Yes, I have the router's information (key works in Windows) - Feedback of lshw says that the wireless card is Ultimate N Wifi Link 5300, vendor: Intel Corporation, physical id: 0 ,etc. The first two commands I was told to try work OK, but when I typed sudo ifconfig wlan0 essid ..... I got back 'essid: Unknown host' Would my question be better on the Ubuntu forums than here on AU?

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• How to maintain Motivation and enthusiasm once you have figured out the solution needed

  - by Pocket_Pie

  I am currently undertaking a software project on my own time. When I first got the project I put in many hours working out how to do the "tricky" parts of the solution. I spent many hours googling and reading up on classes available on MSDN that I could use for the project. I was madly excited and passionate about doing this work. However once, I got a working samples of how I could get around the "tricky" parts and got to the part where all that I needed to do was "grunt" work to finish the project, I lost all interest and desire to work on he project. Suddenly instead of looking forward to sitting down and working on this project it became a chore and a major hassle to motivate myself. I am now fast approaching the deadline and I am getting the work done now, but it is under very high pressure as I have left it almost too close to the deadline! I will manage to get it done but it will involve several all-nighters. (BTW I completely despise doing these all-nighters and would love to eliminate these by maintaining my motivation and working at the project continuously.) So my questions are is this normal? Does everyone else notice such spikes and troughs in their enthusiasm for projects? Anyone more experienced have any advice on how to keep the motivation going? Or am I just not designed to work on a full project lifecycle, should i and people like me being doing an R&D type role where I can do the fun figuring out part of the projects and leave it for someone else to finish the "les interesting/mundane" coding?

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• Synchronize SQL with information from Active Directory

  - by Priokuli

  Hello, I would like to pass information from Active Directory to a Microsoft SQL Server database any time a change is made in Active Directory. In this way the SQL will always have a reliable copy of the AD. Well, i have been reading some post that deal with similar questions, but I can't find the solution. In this post, for example: Synchronization between c# app and Active directory , a user said: '...Then let AD synchronize with SQL.' That sounds good for me, but how can I do that? Thanks in advance.

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