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  • Almost Realtime Data and Web application

    - by Chris G.
    I have a computer that is recording 100 different data points into an OPC server. I've written a simple OPC client that can read all of this data. I have a front-end website on a different network that I would like to consume this data. I could easily set the OPC client to send the data to a SQL server and the website could read from it, but that would be a lot of writes. If I wanted the data to be updated every 10 seconds I'd be writing to the database every 10 seconds. (I could probably just serialize the 100 points to get 1 write / 10 seconds but that would also limit my ability to search the data later). This solution wouldn't scale very well. If I had 100 of these computers the situation would quickly grow out of hand. Obviously I am well out of my league here and I have no experience with working with a large amount of data like this. What are my options and what should I research?

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  • Is realtime validation of username good or bad?

    - by iamserious
    I have a simple form for the user to sign up to my site; with email, username and password fields. We are now trying to implement an ajax validation so the user doesn't have to post the form to find out if the username is already taken. I can do this either on keyup event or on text blur event. My question is, which of these is really the best way to do? Keyup From the user POV, it would be good if the validation is done as and when they are typing, (on key up event) - of course, I am waiting for half a second to see if the user stops typing before firing off the request, and user can make any adjustments immediately. But this means I am sending way more requests than if I validated the username on Blur event. Blur The number of requests will be much lower when the validation is done on blur event, But this means the user has to actually go away from the textbox, look at the validation result, and if necessary go back to it to make any changes and repeat the whole process until he gets it right. I had a quick look at google, tumblr, twitter and no one actually does username validations on keyup events, (heck, tubmlr waits for the form to be posted) but I can swear I have seen keyup validations in a lot of places too. So, coming back to the question, will keyup validations be too many for server, is it an unnecessary overhead? or is it worth taking these hits to give user a better experience? ps: all my regex validations etc are already done on javascript and only when it passes all these other criteria does it send a request to server to check if a username already exists. (And the server is doing a select count(1) from user where username = '' - nothing substantial, but still enough to occupy some resource) pps: I'm on asp.net, MS SQL stack., if that matters.

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  • Prevent Amazon EC2 Time zone from reverting back on yum update

    - by D.Tate
    I use an Amazon EC2 server instance that runs a distro called Amazon Linux AMI. (I've read that it is based on CentOS/Red Hat). My specific version is the 2012.09 release. Anyway, I was able to change the time zone about a week ago from the default UTC to America/New_York (which is EST/EDT). The command I used to change it was: ln -sf /usr/share/zoneinfo/America/New_York /etc/localtime ...thanks to this other Server Fault question. At that point, I was able to run date from the the command line, and it correctly displayed the EDT time. And even after EDT "fell back" to EST this past Sunday, I was pleased to find that running date still produced the correct local time. So that was great. However, after running a yum update yesterday, it seems that my time zone got reverted back to plain 'ol UTC. I even checked the last modified time of /etc/localtime file, and indeed it confirmed that it had been modified around the same time I had updated. Is there any way to prevent this from happening again, or will I be stuck resetting the time zone every time I do a yum update?

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  • Efficient, partial, point-in-time database restores

    - by GavinPayneUK
    This article is about a situation that many of us could describe the theoretical approach to solving, but then struggle to understand why SQL Server wasn’t following that theoretical approach when you tried it for real. Earlier this week, I had a client ask about the best way to perform: a partial database restore, 1 of 1300 filegroups; to a specific point in time; using a differential backup, and therefore; without restoring each transaction log backup taken since the full backup. The last point...(read more)

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  • An "Invoke Update Manager to update everything and shutdown" script after idle for x minutes?

    - by unknownthreat
    I have Ubuntu 10.10 installed on a machine for my parents. The thing is they never request updates from Update Manager even the manager itself prompted them so. Moreover, when they are done with whatever they are doing on Ubuntu, they always leave the computer on. And I always have to come back and shut the machine down. Sometimes, the computer even sit idle for hours. So I want to know whether this is possible in Ubuntu. I am thinking of a script that will be activated after the machine is idle for x minutes. When x minutes have elapsed, Update Manager will automatically update everything listed. (I recall that you need the admin password for this, so is there a workaround?) After all the updates are done, the machine will automatically shutdown. Is this possible?

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  • Time Capsule With Raspberry Pi

    - by Richard Jones
    So I have a Raspberry PI, with an 1TB external USB HD plugged into it. I have Debian Wheezy installed to which I added the NetaTalk package. Following this guide which is on Ubuntu, but was easy enough to understand - http://kremalicious.com/ubuntu-as-mac-file-server-and-time-machine-volume/ I was even able to change the icon to look like an X-Serve :-) Next step to add a second HD that will backup my Windows 8 laptop as well.

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  • Attunity Webcast on Real Time Optimisation For Microsoft BI

    On Wednesday 18th May 1Pm –2PM Eastern Time I am going to be helping Attunity deliver a webcast.  In it I want to highlight some of the challenges we face in getting data around our environments.  I want to highlight the Microsoft products that can help us realise Business Intelligence. It promises to be a good hour.  Hope to see you all there.  Here is the link Attunity Webcast

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  • url changed to www...how much time google take to reindex

    - by user20321
    its been about a week i have changed my url from non www to www version it was done by my host provider .....now i want to ask how much time does google take to remove my sitename.com from indexing and replace it with www.sitename.com (site redirection has been already done by host provider )as it is still showing old ones my new urls are indexed but my main url www.sitename.com is not indexed...or so do i have to remove those old urls personally...its been already about 5-6 days?????

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  • It has been a long time since last post

    - by The Official Microsoft IIS Site
    Wow, just realized that in the last 6 months I’ve only had a chance to post 2 items and I think it is about time to start this going again. So why this much silence? Well, About 8 months ago a couple of big changes happened at my division as described in this link . As part of that transition my responsibilities changed and I transitioned from being the Development Manager for the Web Platform (IIS, WebMatrix, WebDeploy, etc…) to take a new role and start a new team that we called Azure UX team....(read more)

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  • How to make Ubuntu remember forever the password after the first time

    - by Luis Alvarado
    Is it possible to make Ubuntu remember the password for any program after the first time it asks. I get asked for the password for Synaptic, for making a usb bootable, for connecting to the wifi network, for opening gparted and even to go to the bathroom. Is there a way to just tell it to ask once forever or just tell it to not ask (Without going to root account. I want to keep using my own account)

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  • How to reduce bubble-notification time in empathy?

    - by MCan
    empathy shows a bubble notification message on top right corner if a user comes online or goes offline (obviously we can change them from the preferences), but is there any way we can reduce the time for which the bubble notification remains on screen. By default it remains fro 3-4 seconds, is there any way we can change it to 1 or may be 2 seconds (I know the matter is of few seconds only but 4 seconds looks too long and I want to reduce it). Any help is welcome. Cheers.

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  • JCP.next.3: time to get to work

    - by Patrick Curran
    As I've previously reported in this blog, we planned three JSRs to improve the JCP’s processes and to meet our members’ expectations for change. The first - JCP.next.1, or more formally JSR 348: Towards a new version of the Java Community Process - was completed in October 2011. This focused on a small number of simple but important changes to make our process more transparent and to enable broader participation. We're already seeing the benefits of these changes as new and existing JSRs adopt the new requirements. However, because we wanted to complete this JSR quickly we deliberately postponed a number of more complex items, including everything that would require modifying the JSPA (the legal agreement that members sign when they join the organization) to a follow-on JSR. The second JSR (JSR 355: JCP Executive Committee Merge) is in progress now and will complete later this year. This JSR is even simpler than the first, and is focused solely on merging the two Executive Committees into one for greater efficiency and to encourage synergies between the Java ME and Java SE platforms. Continuing the momentum to move Java and the JCP forward we have just filed the third JSR (JCP.next.3) as JSR 358: A major revision of the Java Community Process. This JSR will modify the JSPA as well as the Process Document, and will tackle a large number of complex issues, many of them postponed from JSR 348. For these reasons we expect to spend a considerable amount of time working on it - at least a year, and probably more. The current version of the JSPA was created back in 2002, although some minor changes were introduced in 2005. Since then the organization and the environment in which we operate have changed significantly, and it is now time to revise our processes to ensure that they meet our current needs. We have a long list of topics to be considered, including the role of independent implementations (those not derived from the Reference Implementation), licensing and open source, ensuring that our new transparency requirements are implemented correctly, compatibility policy and TCKs, the role of individual members, patent policy, and IP flow. The Expert Group for JSR 358, as with all process-change JSRs, consists of all members of the Executive Committees. Even though the JSR has just been filed we started discussions on the various topics several months ago (see the EC's meeting minutes for details) and our EC members - including the new members who joined within the last year or two - are actively engaged. Now it's your opportunity to get involved. As required by version 2.8 of our Process (introduced with JSR 348) we will conduct all our business in the open. We have a public java.net project where you can follow and participate in our work. All of our deliberations will be copied to a public Observer mailing list, we'll track our issues on a public Issue Tracker, and all our documents (meeting agendas and minutes, task lists, working drafts) will be published in our Document Archive. We're just getting started, but we do want your input. Please visit us on java.net where you can learn how to participate. Let's get to work...

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  • contractor vs full time employee

    - by Victor
    What is the long term career prospect of a contractor/consultant in IT field vs a full time salaried employee? The usual arguments aside: Stability vs more upfront money;paid leaves vs tax savings;less paperwork vs more freedom;stagnation vs changing job environments etc etc etc Can some one with a long career experience in hopefully both sides of the divide comment on the pros and cons of contracting vs being an employee? This will be beneficial for all if only people with ample experience choose to answer. Comments are always welcome though.

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  • Does tweeting 9 to 5 hurt job applicants?

    - by evadeflow
    If you were looking into a job applicant's background and discovered that he or she has 1200 followers on Twitter and averages 50 tweets per day (more than half of which are during business hours), would it affect your hiring decision? How and why? Personally, I'd be a little worried about the candidate's ability to focus on the job at hand if they're constantly checking in with their 'tweeps' thoughout the day. In non-tech jobs, a lot of companies simply block Twitter as an irrelevant distraction. But it can be a useful resource---to programmers in particular. I just wonder how much is too much. At what point does it become a red flag?

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  • Where does ntpdate get its settings from and what is the "no servers can be used" error about?

    - by wilhil
    When I run ntpdate on its own, I get the following output: 8 Jun 15:47:46 ntpdate[31251]: no servers can be used, exiting If I run it with the -q ntp.ubuntu.com switch, it seems to query just fine. I have been hunting through many files and the most relevant one I have found is /etc/default/ntpdate, however, even with NTPDATE_USE_CONF set to no, I just can't understand/see how this error is occurring Any ideas? Update-- been looking non stop... It appears that ntupdate-debianworks fine and is the actual command that makes use of /etc/default/ntupdate, but, this doesn't answer the main question and I still can't find it...

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  • Storage device manger regarding NTFS automount at boot time

    - by muneesh
    I am using storage device manager to auto-mount NTFS file system at boot time.But repeatedly, I am trying to uncheck the checkbox listed 'read only mode' in assistant option of storage device manager. I am not able to to auto-mount my NTFS partition in read/write mode. Please suggest a solution regarding this problem? Remember I am repeatedly trying to uncheck read only checkbox but not able to do that!

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  • Effective methods for managing work tasks? (documenting/remembering/prioritizing)

    - by Kaleb Brasee
    I'm looking for suggestions on effective methods that I can use to document, remember and prioritize tasks at work. Many of the these tasks belong to a primary project, but they also exist for independent initiatives. The tasks themselves cover everything from development to documentation to discussions, with varying priorities, and deadlines ranging from right away to a few months from now. Historically I have used a notepad to keep track of these tasks, with a star next to an item indicating it needs to be done and a check mark when it's completed. However, as I gain more responsibilities and more things to manage: it becomes harder to make sure I've done everything (because some things get lost 5 pages back) it becomes harder to remember what's most important to do next it becomes harder to keep track of dependencies between tasks Has anyone found methods that have made their tasks easier to manage? I've considered adding some meta-data to keep track of what's most important and dependencies, or possibly switching to an app that could automate this (if such a thing exists). Something that's accessible anywhere would definitely be a plus.

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  • Using Minified Page Specific JS [migrated]

    - by Mike C
    I've been working on a rather large scale project which makes use of a number of different pages with some very specific Javascript for each of them. To lessen load times, I plan to minify it all in to one file before deploying. The problem is this: how should I avoid launching page specific JS on pages which don't require it? So far my best solution has been to wrap each page in some additional container <div id='some_page'> ...everything else... </div> and I extended jQuery so I can do something like this: // If this element exists when the DOM is ready, execute the function $('#some_page').ready(function() { ... }); Which, while kind of cool, just rubs me the wrong way.

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