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• Alerts are good, aren't they?

  - by fatherjack

  It is accepted best practise to set some alerts on every SQL instance you install. They aren't particularly well publicised but I have never seen any one not recommend setting up alerts for Error 823, 824 and 825. These alerts are focussed on successful access(IO) to the hard drives that SQL Server is using. If there are  any errors when reading or writing to the drives then one of these errors will be returned. Having the alerts on these errors means that any IO issues will be brought to the...(read more)

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• Phantom activity on MySQL

  - by LoveMeSomeCode

  This is probably just my total lack of MySQL expertise, but is it typical to see lots of phantom activity on a MySQL instance via phpMyAdmin? I have a shared hosting plan through Lithium, and when I log in through the phpMyAdmin console and click on the 'Status' tab, it's showing crazy high numbers for queries. Within an hour of activating my account I had 1 million queries. At first I thought this was them setting things up, but the number is climbing constantly, averaging 170/second. I've got a support ticket in with Lithium, but I thought I'd ask here if this were a MySQL/shared host thing, because I had the same thing happen with a shared hosting plan through Joyent.

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• Can we grant sudo to an already opened application?

  - by james

  So, can we grant sudo to an already opened application ? I wish to first open an application as normal user and incase if i need root permissions on it i wish to grant su without restarting the application.. I tried opening an application and then type "sudo appname" in terminal, but that opens a new app window retaining normal user permissions on old app window. Say, i want to check and edit /etc/apt/sources.list . I open a filemanager and go to the path and click on sources.list which opens a text editor with that file in view. If i feel i need to edit that, then i want to grant sudo to that instance of text editor rather than opening a new root text editor and browsing the entire path.

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• Apache suddenly very slow on http and faster on https

  - by hsnm

  Background: I have Apache 2 running on ubuntu. There is a low usage on it and mostly being accessed for a web service URL from mobile apps. It was working fine until I installed SSL certificates. I now have both http and https. When I access the server using https, I get a fairly quick response (but probably not as fast as before). When I use http, it's so slow. What I tried: From this post: I curl localhost from the host and it takes some time, meaning there is no routing issue. The server runs on Amazon EC2 instance and is managed by me only. Also: I see that Apache once running, creates the maximum number of processes it is allowed to, which was not the case before. I lowered the MaxClients to 20 and I think I'm getting faster responses but it still takes over a minute and I always have MaxClients Apache processes. dmesg returns many [ 1953.655703] TCP: Possible SYN flooding on port 80. Sending cookies. When I netstat I get many entries with SYN_RECV. Possibly a DDoS attack? From EC2's monitoring diagrams I see a pattern of high "Maximum Network In (Bytes)" since 2 days ago. By the way the server is still being tested, the actual traffic is very low and not consistent. I tried to go with this solution to limit incoming connections using iptables, still no luck, but I'm trying. Question: What could be the problem? Is this a DDoS attack?

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• How do you explain commented-out code to a non-programmer? [closed]

  - by whirlwin

  What is the quickest and most comprehensible way to explain to a non-programmer what commented-out code is? When I mentioned it in a conversation to non-programmers, they seemed lost. Such people could for instance be graphical designers, when working on the same team to make an application. Typically I would need to mention what I will be/currently am working with during an update meeting. At first I thought about substituting commented-out with unused code. While it is true to some degree, it is also very ambiguous. If you are wondering, I am working with legacy code with commented-out code. This leads to my question: "how do you explain commented-out code to a non-programmer?"

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• New Development Snapshot

  More bug fixing and rounding out IKVM.Reflection. Changes: Fixed resolution of generic type instance names with "fake" type as type argument. Fixed bug in Finalize/finalize special casing for .NET types that caused exception when reflecting on them. Fixed Finalize/finalize special casing for .NET types to also work for java.lang.Throwable derived types. Removed fake core class library types from ikvmstub and added a -bootstrap...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• ASP.NET Combo Box and List Box Performance Improvements - v2010 vol 1

  Check out this great new performance feature of our ASP.NET combo box and list box controls for the DXperience v2010.1 release. You can now manually populate lists with items based on the currently applied filter criteria. This means that you can significantly decrease web server workload by loading only a subset of all items when working with large datasets. For instance, when using a large data source, you can only request a few records to be visible on the screen. The rest of the items can...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to create reproducible probability in map generation?

  - by nickbadal

  So for my game, I'm using perlin noise to generate regions of my map (water/land, forest/grass) but I'd also like to create some probability based generation too. For instance: if(nextInt(10) > 2 && tile.adjacentTo(Type.WATER)) tile.setType(Type.SAND); This works fine, and is even reproduceable (based on a common seed) if the nextInt() calls are always in the same order. The issue is that in my game, the world is generated on demand, based on the player's location. This means, that if I explore the map differently, and the chunks of the map are generated in a different order, the randomness is no longer consistent. How can I get this sort of randomness to be consistent, independent of call order? Thanks in advance :)

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• hotkeys do not work sometimes in ubuntu 12.04

  - by stepank

  I use Ubuntu 12.04 with Unity 2D and I've stumbled upon this issue: sometimes shortcut keys stop working in some windows. For instance, I have these windows opened usually: Google Chrome, Terminal, Skype, Pidgin. Sometimes everything is OK and shortcuts work no matter what window I hit them from, however, hotkeys hit from Skype (more often) or Pidgin (less often) do not work, but they still work from Terminal or Google Chrome. Moreover, not all hotkeys are affected, the problem holds only for locking the computer (Ctrl + Alt + L) and other custom shortcuts like executing some command or launching a program (I used zenity --entry with [Super | Ctrl] + [some letter: K, N, etc] for testing). Does anyone have a clue what is causing the problem and how to fix it?

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• Windows 2008 Server can't connect to FTP

  - by stivlo

  I have Windows 2008 Server R2, and I am trying to install FTP services. My problem is I can't connect from outside, FileZilla complains with: Error: Connection timed out Error: Could not connect to server Here is what I did. With the Server Manager, I've installed the Roles FTP Server, FTP Service and FTP Extensibility. In Internet Information Services version 7.5, I've chosen Add FTP Site, enabled Basic Authentication, Allow a user to connect Read and Write. In FTP Firewall support on the main server, just after start page, I've set Data Channel Port Range to 49100-49250 and set the external IP Address as the one I see from outside. If I click on FTP IPv4 Address and Domain Restrictions, and click on Edit Feature Settings, I see that access for unspecified clients is set to Allow, so I click OK without changing those defaults. In FTP SSL Policy, I've set to Require SSL connection, certificate is self signed. I tried to connect with FileZilla from the same host and it works, however it doesn't work remotely, as I said above. I've enabled pfirewall.log, but apparently nothing gets logged. The server is in Amazon EC2, and on the security group inbound firewall rules, I've set that ports 21 and ports 49100-49250 accepts connections from everywhere. What else should I be checking to solve the problem?

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• DHCP won't start / subnetting

  - by user114371

  I recently changed the IP address on an Ubuntu 12.04 server I have in my lab, which is running isc-dhcp-server. After doing so and modifying the dhcpd.conf file, my dhcp service would not start. I basically used the same configuration, except I modified everything to use /25 scopes rather than /24. When I try to start / restart the service, I see the following: MY@ubuntuserver:~$ sudo service isc-dhcp-server restart stop: Unknown instance: isc-dhcp-server start/running, process 20918 It looks like it starts, but it isn't actually running and Webmin states that the DHCP service is not running. So my question is, does isc-dhcp-server support subnetting (CIDR) style scopes, or must they be class A / B / C scopes (doesn't seem likely)? I've double checked the interface reference (this is a VM with only one defined eth0 interface) and everything else I can thing of.

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• What are some ways to texture map a terrain?

  - by ApocKalipsS

  I'm working with XNA on a 3D Game, and I'm trying to have a proper and nice environnement. I actually followed a tutorial to create a terrain from a heightmap. To texture it, I just apply a grass texture on it and tile it a number of times. But what I want to do is to have a really realistic texturing, but also generate it automatically (for example if I want to use Perlin noise to generate a terrain and then texture it). I already learned about multi-texturing, loading a map file with different colors for different textures, but I don't think this is really efficient, for instance for cliffs or very steep areas it will tile a texture badly as it's a view from the top. (Also, I don't know how I'll draw roads or dirt paths with that.) I'm looking for an efficient solution to realistically texture mapping procedurally-generated terrain.

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• Should I Learn C/C++ Even If I Just Want To Do Web Programming?

  - by Daniel

  My goal is to be able to create online apps and dynamic, database driven websites. For instance, if in the future I get the idea for the next Digg or Facebook, I want to be able to code it myself. To arrive there I think I have basically two paths: Path 1 Start at a basic level, learning C, then C++ for OOP, then algorithms and data structures, with the goal of getting a solid grasp of computer programming. Only then move to PHP/MySQL/HTTP and start working on practical programming projects. Path 2 Start directly with PHP/MySQL/HTTP and getting my hands dirty with practical projects right away. What would you guys recommend?

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• Avoid overwriting of logs

  - by Koppar

  What usually happens is, the logs get filled up and begin getting overwritten, which makes them useless. To avoid it, use these 2 properties in the logging.properties file to suit your requirement: java.util.logging.FileHandler.count  = x (it is 1 by default, increase it to a bigger value) This number specifies the number of log files that can be created before overwriting starts. For instance, if you set it to 5, java0.log, java1.log ... java5.log will be created to log details so more information can be captured Likewise, java.util.logging.FileHandler.limit  would specify the size of each log.

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• How to get the Time Difference in C# .net

  - by Aamir Hasan

  A DateTime instance stores both date and time information. The DateTime class can be found in the System namespace.In order to retrieve the current system time, we can use the static property Now of the DateTime class.In this Example i have shown, how to calculate the difference between two DateTime objects using C# syntax. DateTime startTime; DateTime endTime;            startTime = Convert.ToDateTime("12:12 AM");            endTime = Convert.ToDateTime("1:12 AM");            var timeDifference = new TimeSpan(endTime.Ticks - startTime.Ticks);Response.Write("Time difference in hours is " + timeDifference.Hours);Link:http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

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• Syncing WM6 <-> Evolution.... opensync-module-python missing?

  - by luri

  I'm trying to install opensync-plugin-synce to sync my wm6 phone with Evolution, but when I try (from synaptic, also with ap-get), is: Depende: opensync-module-python but it is not installable In fact, I haven't found opensync-module-python in repositories. Any hint? Is there any way to sync WM6 and Evolution (preferably without intermediate online syncs as Gmail, for instance)? Update: opensync-module-python exists in the repositories for previous versions of Ubuntu (mine is 10.10).... could I install it from there or would I ruin something? Update: should I mark this as impossible? Seems to be no way to sync WM6 phone with Evolution right now....

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• How do I make a subdomain of a subdomain?

  - by joe

  I have a server that hosts mydomain.com. Then I have a server that hosts subdomain1.mydomain.com. On the subdomain1.mydomain.com server, how do I make subdomains? For instance I want to create subdomain2.subdomain1.mydomain.com I have my subdomain1.mydomain.com site in /home/USER/public_html and it is working just fine. But When I try to create subdomain2.subdomain1.mydomain.com, it says Server not found in the browser. I have tried so many configurations in my /etc/hosts and /etc/apache2/sites-available/subdomain2.subdomain1.mydomain.com, without any luck Can I get some detailed instructions maybe? I have looked everywhere and every place tells you different, with no luck. Ubuntu Server 11.10 w/ the Lamp Stack option

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• XNA GameTime TotalGameTime slower than real time

  - by robasaurus

  I have set-up an empty test project consisting of a System.Diagnostics.Stopwatch and this in the draw method: spriteBatch.DrawString(font, gameTime.TotalGameTime.TotalSeconds.ToString(), new Vector2(100, 100), Color.White); spriteBatch.DrawString(font, stopwatch.Elapsed.TotalSeconds.ToString(), new Vector2(100, 200), Color.White); The GameTime.TotalGameTime displayed is slower than the stop watch (by about 5 seconds per minute) even though GameTime.IsRunningSlowly is always false, why is this? The reason this is an issue is because I have a server which uses stopwatch and it is faster than my client game. For instance my client notifies the server it has dropped a mine which explodes in one minute. Because the stopwatch is faster the server state explodes the mine before the client and they are out of sync. I don't want to have to notify the client when the server explodes it as this would use unnecessary bandwidth.

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• Are ZFS snapshots + S3 a viable backup system for several VMs and general fileserver storage?

  - by AllanA

  I've been tasked with setting up a backup system for my small office (around 12 people). Most of our production stuff is on the AWS cloud, so what I need to back up are some small office/development files (under 100G right now), plus our operational VMs and development, which round out to a bit under 1T. I just need something reliable, convenient, and straightforward. I'm comfortable with Linux, FreeBSD, and to some extent Solaris 10, so I'm leaning toward a full server rather than an appliance system ala Openfiler or FreeNAS. What I'm contemplating is a small fileserver for general storage and nightly backups of the virtual machines, followed up by an offsite backup to Amazon's S3 storage service. It'd be the usual incremental backups nightly and full backup weekly. My question is if using ZFS snapshots, both locally and dumped to S3 via 'zfs send [-i]', is a viable backup tool? Or should I stick to using Duplicity, or some other method entirely? ZFS snapshots on the internal fileserver/backup machine sound like a perfect way to provide quick and convenient data recovery, so I'm likely to go with that for local redundancy. (If you folks see scenarios where relying on ZFS snapshots would be worse than a more traditional archiving backup, feel free to convince me.) But are snapshots flexible enough to lean on for recovery from the loss of my backup server? Or am I better off with something more traditional? (feel free to recommend free or commercial backup solutions you favor.)

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• How often do you use google, to answer programming relatated questions? [closed]

  - by Mercfh

  I hope this isn't too subjective, but it is programming related and Im curious. Alot of times I feel.......dumb for lack of a better word when I have to look something up. Alot of times I forget all the specificity of a language and have to look up something like "Doing XXX in C++" for instance, or something along the lines of that. How often do you guys as Programmers both Professionally and On your own have to use google to look up something. Or do most people just kind of remember these things. I guess what Im really asking is, do you often have to use google or other web-search sites to remember how to do what is seemingly "simple" things with languages but you've just forgotten? Please tell me im not the ONLY one.

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• schema.org specification for generic pages or posts on a CMS

  - by NateWr

  I'm trying to determine the best possible schema.org type to declare for the content section in the template of a content management system, which will handle regular news posts for small, local hospitality businesses. The type should represent the content of that page, which is likely to be a wide range of things. The description for Article pretty strongly encourages its use to be limited to the articles of a publication. For purely semantic reasons, I'm not sure if Blog is appropriate in this case -- businesses won't be creating typical "blog" content but are more likely to be writing about upcoming events, special deals, awards, etc. Would Webpage be appropriate in this instance? Although I'm a fan of the schema.org concept, I frequently find myself unsure how broadly or narrowly I'm meant to infer the meaning of a type. In such cases, is it safe to use a high-level element, such as CreativeWork, or does this blunt the usefulness of the markup?

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• Formatting Google Search Result [closed]

  - by user5775

  Possible Duplicate: What are the most important things I need to do to encourage Google Sitelinks? Hello, I am new to search engine optimization. I am working on customizing how my results appear in Google as best as possible. I have learned about the meta tags to customize the text summary. However, I have some hierarchical parts to my website. When a result appears related to the "tip-of-the-iceberg", I would like to show links related to the "child" pages. For instance, if you Google "Walmart" you will see the following links listed with the result: Electronics TV & Video Departments Furniture Toys Girls Living Room Computers Is there any way that I can help Google determine which links to show and the text to display for these child links on my site? Or is this something that Google automatically generates? thanks!

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• Need an engine for MMO mockup

  - by Kayle

  What I don't need is an MMORPG engine, at the moment. What I do need is a flexible easy-to-use engine that I can make a mock-up with. I don't need support for more than 10 players in an instance, so any multiplayer platform is probably fine. I need an engine with which I can create the following core features: Waves of simple AI enemies that have specific objectives (move to point A, destroy target, move to point B). The units present can be between 50-200 in number. An over-the-shoulder view and the ability to control a team of 3 (like Mass Effect or the latest Dragon Age) Functioning inventory system Right now, all I can really think of is Unreal or Source. Any other suggestions? Again, this is a proving mock-up, not an actual MMO. I'm not terribly worried about the visual aspects as we just want to test mechanics. Note: Can write some scripts in Python, Ruby, or Lua, if necessary.

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• Programming language for simple program?

  - by jamherst

  I am wondering about which programming languages people see fit to create a program idea that I had. I am looking to create a fairly simple program whose main functions are adding to, managing, and searching through a database of people, all through a polished GUI. It will be for use in the business world, so I think Windows would be the priority, but Mac and Linux support wouldn't be bad. Also, eventually I would like to add the ability for an instance of one program on a computer to interact with other instances on the same network, mainly through the sharing of a database. Most of my experience is in Java, but I don't particularly like the appearance of Java GUIs, so I'm looking for an alternative. I noticed that a lot of people have suggested C++ or C# in similar posts, so what are some of the advantages/disadvantages of one or both if that is your suggestion. Thanks for any help in advance.

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• Could you give me an example of how to attach an object in Deleted state – I keep getting an exception [migrated]

  - by carewithl

  From MSDN : An object in the Deleted state can only be attached when the ObjectStateManager is already tracking the relationship instance. Could you give me an example of how to attach an object in the Deleted state. I tried the following and got "System.InvalidOperationException: The object being attached is in an added or deleted state. Relationships cannot be created for objects in this state". var contact = context.Contacts.First(); Console.WriteLine(contact.Addresses.Count()); // 2 var address = contact.Addresses.First(); context.Addresses.DeleteObject(address); contact.Addresses.Attach(address); // InvalidOperationException thank you

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