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  • How to schedule time-of-day upgrades

    - by Richard
    Hello, I'm responsible for about 30 Ubuntu computers at a private K-8 school. We have only a 3Mbps internet connection serving the entire campus, and I would like to ensure that updates are done in the middle of the night - so that daytime tasks are not slowed down. I'm using Ubuntu 10.04, and have set all computers to download and install security updates via the update manager. I have also installed cron-apt, and modified the config file to stagger the start times of the upgrades from about 10pm to 4am local time. HOWEVER - this morning I arrived at the school at 7:30am and all the computers were busy downloading a large security based update. Needless to say, all internet activity was slowed to a crawl (for the next 2 hours), and the computer users were very very upset. This was the event I'm trying so hard to prevent. It seems that my scheme to ensure middle of the night downloads failed, and I'm not sure why. I've also tried some schemes using unattended-upgrades & crontab, but there always seemed to be something scheduling upgrades to occur in addition to the ones I try to force at middle of the night. Is there a sure fire way to absolutely positively guarantee that updates will occur only at one specific time? It would be nice if the update manager just had a drop down menu to specify a designated time. Thanks in advance for any help you can give me.

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  • System that splits passwords across two servers

    - by Burning the Codeigniter
    I stumbled upon this news article on BBC, RSA splits passwords in two to foil hackers' attacks tl;dr - a (randomized) password is split in half and is stored across two separate servers, to foil hackers that gained access to either server upon a security breach. Now the main question is, how would this kind of system would be made... codespeaking, for PHP which I commonly develop on my web applications, the database password is normally stored in a configuration file, i.e. config.php with the username and password, in that case it is understandable that the passwords can be stolen if the security was compromised. However when splitting and sending the other half to the other server, how would this go on when making a communication to the other server (keeping in mind with PHP) since the other server password would be stored in a configuration file, wouldn't it? In terms of security is to keep the other server password away from the main one, just exactly how would the main server communicate, without exposing any other password, apart from the first server. This certainly makes me think...

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  • A fix for the design time error in MVVM Light V4.1

    - by Laurent Bugnion
    For those of you who installed V4.1 of MVVM Light and created a project for Windows Phone 8, you will have noticed an error showing up in the design surface (either in Visual Studio designer, or in Expression Blend). The error says: “Could not load type ‘System.ComponentModel.INotifyPropertyChanging’ from assembly ‘mscorlib.extensions’” with additional information about version numbers. The error is caused by an incompatibility between versions of System.Windows.Interactivity. Because this assembly is strongly named, any version incompatibility is causing the kind of error shown here (for an interesting discussion on the strong naming issue, see this thread on Codeplex). I managed to resolve the issue for Windows Phone 8 and will publish a cleaned up installer next week. In the mean time, in order to allow you to continue development, please follow the steps: Download the new DLLs zip package (MVVMLight_V4_1_25_WP8). Right click on the Zip file and select Properties from the context menu. Press the “Unblock” button (if available) and then OK. Right click again on the zip package and select “Extract all…”. Select a known location for the new DLLs. Open the MVVM Light project with the design time error in Visual Studio 2012. Open the References folder in the Solution Explorer. Select the following DLLs: GalaSoft.MvvmLight.dll, GalaSoft.MvvmLight.Extras.dll, Microsoft.Practices.ServiceLocation.dll and System.Windows.Interactivity.dll. Press “delete” and confirm to remove the DLLs from your project. Right click on References and select Add Reference from the context menu. Browse to the folder with the new DLLs. Select the four new DLLs and press OK. Rebuild your application, and open it again in Blend or in the Visual Studio designer. The error should be gone now. In the next few days, as time allows, I will publish a new MSI containing a fixed version of the DLLs as well as a few other improvements. This quick fix should however allow you to continue working on your Windows Phone 8 projects in design mode too.   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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  • Make a server for a chat

    - by Sebastian
    Hello, I would like to make a server for a chat and I wonder whether a server must, for example, connect to MySQL whenever a client enter to a room to check if he is moderator or banned from this room. Is it necessary that I use MySQL to update the number of connected clients whenever a client go to another room(to display the number of connected clients on a web page)?

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  • Question regarding Readability vs Processing Time

    - by Jordy
    I am creating a flowchart for a program with multiple sequential steps. Every step should be performed if the previous step is succesful. I use a c-based programming language so the lay-out would be something like this: METHOD 1: if(step_one_succeeded()) { if(step_two_succeeded()) { if(step_three_succeeded()) { //etc. etc. } } } If my program would have 15+ steps, the resulting code would be terribly unfriendly to read. So I changed my design and implemented a global errorcode that I keep passing by reference, make everything more readable. The resulting code would be something like this: METHOD 2: int _no_error = 0; step_one(_no_error); if(_no_error == 0) step_two(_no_error); if(_no_error == 0) step_three(_no_error); if(_no_error == 0) step_two(_no_error); The cyclomatic complexibility stays the same. Now let's say there are N number of steps. And let's assume that checking a condition is 1 clock long and performing a step doesn't take up time. The processing speed of Method1 can be anywhere between 1 and N. The processing speed of Method2 however is always equal to N-1. So Method1 will be faster most of the time. Which brings me to my question, is it bad practice to sacrifice time in order to make the code more readable? And why (not)?

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  • MSSQL Server high CPU and I/O activity database tuning

    - by zapping
    Our application tends to be running very slow recently. On debugging and tracing found out that the process is showing high cpu cycles and SQL Server shows high I/O activity. Can you please guide as to how it can be optimised? The application is now about an year old and the database file sizes are not very big or anything. The database is set to auto shrink. Its running on win2003, SQL Server 2005 and the application is a web application coded in c# i.e vs2005

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  • Debugging "Incorrect Syntax" Exception

    - by MattH
    I have recently been working with a COM+ component that processes an input XML file, and makes a number of database updates based on the supplied data. Running SQL Profiler with EventClass Exception, and User Error Message selected, I see: Exception Error: 102, Severity: 15, State: 1 User Error Message Incorrect syntax near '3'. However I really want to see the full SQL that is being supplied by the COM+ component. Is there anyway for me using Profiler, or other, for me to intercept the SQL statement that was sent to the SQL Server? This machine is using SQL Server 2005, and the COM+ object is written in Delphi.

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  • SQL Server 2008 Optimization

    - by hgulyan
    I've learned today, if you append to your query OPTION (MAXDOP 0) your query will run on multiple processors and if it's huge query, query will perform faster. I know general guidelines on query optimizations (using indexes, selecting only needed fields etc.), my question is about SQL Server optimization. Maybe changing some options in configurations or anything else. What guidelines are there for SQL Server Optimization? Thank you.

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  • Network structure --> Server 2k8r2 <--> Livebox <--> Router <--> Other PCs

    - by Yusuf
    I have a Livebox connection to the Internet and I have set up my network as follows: - Livebox <--> Win2k8R2 Server - Livebox <--> Netgear N150 Router - Router <--> Other PCs Therefore, in my LAN, - the Livebox has IP address 192.168.1.1, - the Router 192.168.1.12 (when accessed from the Livebox or the server), - the Router 10.0.0.1 (when accessed from the PCs connected to the Router), - the server 192.168.1.2, - the PCs 10.0.0.x I was using a previous configuration, which was as follows: - Livebox <--> Netgear N150 Router - Router <--> Win2k8R2 Server - Router <--> Other PCs Everything was simple, and I just had to forward all ports for incoming connection on the Livebox to the Router, and then forward the specific ports to the Server as needed (it must be however noted that any server I use is found on the Win2k8R2 server itself). In this previous configuration, the IP addresses were as follows: - Livebox 192.168.1.1 - Router 192.168.1.12 (when seen from Livebox) - Router 10.0.0.1 (when seen from server & PCs connected to it) - Server 10.0.0.2 - PCs 10.0.0.x So now of course, my port-forwarding does not work anymore since the server is not connected (directly) to the Router. What I would like to know is how do I configure the Livebox and Router to still have the features like before? From what I understand of networks (which is very limited, btw), I see these options: Make the router assign IPs like 192.168.1.x (but then I want the forwarding to be done from the router itself, is it possible?) The forwarding on the router to the server uses IP address 10.0.0.2. I could change it to 192.168.1.2 (Is that even possible, does it work?) Forward all ports from the Livebox itself to the server, and then manage them there (Is software-based port-forwarding as secure as hardware-based?)

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  • Time Zone on WebLogic Server

    - by adejuanc
    In order to configure the time zone with WebLogic Server, use the following JVM startup command: -Duser.timezone=<timezone> For example, in the java arguments in the admin console at Environments -> Servers -> Servername -> - Server Start tab, configure the startup settings that Node Manager will use to start the particular server. For example: -Duser.timezone='America/Arizona' There are many different time zones, each with its own code. For a complete list please refer to : http://en.wikipedia.org/wiki/List_of_zoneinfo_time_zones For testing, you can run the following code on WLS with a JSP, servlet, or deploying the class: import java.util.Calendar; import java.util.TimeZone; public class TestTimeZone {  public static void main(String[] args) {    Calendar calendar = Calendar.getInstance();    TimeZone timeZone = calendar.getTimeZone();    System.out.println(" your Current TimeZone is : " + timeZone.getDisplayName());    System.out.println(" Time Zone id : "+ timeZone.getID());  } }

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  • Is there a name for this use of the State design pattern?

    - by Chris C
    I'm looking to see if there is a particular name for this style of programming a certain kind of behavior into a program. Said program runs in real time, in an update loop, and the program uses the State design pattern to do some work, but it's the specific way it does the work that I want to know about. Here's how it's used. - Object Foo constructed, with concrete StateA object in it - First loop runs --- Foo.Run function calls StateA.Bar --- in StateA.Bar replace Foo's state to StateB - Second loop runs --- Foo.Run calls StateB.Bar - Third loop runs --- Foo.Run calls StateB.Bar - Fourth loop --- etc. So in short, Foo doesn't have an explicit Initialize function. It will just have Run, but Run will do something unique in the first frame to initialize something for Foo and then replace it with a different action that will repeat in all the frames following it- thus not needing to check if Foo's already initialized. It's just a "press start and go" action. What would you call implementing this type of behavior?

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  • Keeping DB Table sorted using multi-field formula (Microsoft SQL Server)

    - by user298167
    I have a JOB table, with two interesting columns: Creation Date Importance (high - 3, medium 2, low - 1). A JOB record's priority calculated like this: Priority = Importance * (time passed since creation) The problem is, every time I would like to pick 200 jobs with highest priority, and I don't want to resort the table. Is there a way to keep rows sorted? I was also thinking about having three tables one for High, Medium and Low and then sort those by Creation Date.

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  • Ad-hoc retreival of data from SQL Server varbinary column

    - by Daniel Fortunov
    I would like to retreive some binary data from a varbinary(max) column in a SQL Server database for debugging purposes. What is the easiest way to get this data into a local binary file, preferably without having to write a throw-away console application? I have tried using SQL Server Management Studio but this returns a hex encoded binary string, rather than raw binary data (even with the "results to file" option).

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  • deadlocks in Client Server Application

    - by fakhrad
    hi (excuse me about my english) I'm a dotnet propgrammer. recently i wrote a client-server application that use system.net.sockets for connecting and use .net remoting for comunications. when number of client increased(e. up to 100) sometimes server application freezed and after several minuts comebacks. i use sql2005 with pooling and timeout. Plz Help Me!

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  • Vmware player change dhcp server settings

    - by Tathagata
    I have a Windows Server 2003 running from a Vmware player on Win 7 box. The idea is to test Windows Deployment service in the virtual network. Is it possible to configure the vmware dhcp server with WDS related stuff(option 66, 67)? I found a few references where people were using the vnetlib.exe to start, stop the dhcp serverchange the subnet mask etc - but there's no info on how to get set the dhcp server options. DHCP config from the virtual network editor I do have the Workstation, without the license for it. In the Virtual network Editor, the DHCP settings for the network I'm using, only allows me to set the subnetmask, IP ranges and stuff like that. But not the dhcp options. DHCP server on the WDS server Authorizing the DHCP server in the guest WDS server fails. The VMware player can run its own dhcp server fro the virtual network with out any authorization from the Active directory - can I do the same, with Win dhcp server in the guest Win Server? ~~~~~ Can I authorize W2K8 DHCP server for private network, even when prohibited in enterprise network? says we have to run a third party dhcp server... :/.

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  • Installing databases after installation of server.

    - by claws
    Hello, I my software I need the client to install a database server (MySQL in my case). I'm deploying the setup and making user install it like a pre-requisite. After installing the DBMS server. I need to setup databases (that I created) on the client machine. How to do this automatically (as part of installation.)?

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  • Using ROWLOCK in an INSERT statement (SQL Server)

    - by RPS
    Would it be wise to use ROWLOCK on an insert statement that is copying large amounts of data and inserting it into the same table? Ex) INSERT INTO TABLE with (rowlock) (id, name) SELECT newid, name FROM TABLE with (nolock) WHERE id = 1 Does anybody have recommendations on how to improve this statement, as I see when SQL Server gets busy it will end in Timeout Query returned for SQL Server.

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  • Microsoft SQL Server 2005 Function, passing list of start and end times

    - by Kevin
    I'd like to do had a dynamic number of one start/end time pairs passed to a function as an input parameter. The function would then use the list instead of just one start, and one end time in a select statement. CREATE FUNCTION [dbo].[GetData] ( @StartTime datetime, @EndTime datetime ) RETURNS int AS BEGIN SELECT @EndTime = CASE WHEN @EndTime > CURRENT_TIMESTAMP THEN CURRENT_TIMESTAMP ELSE @EndTime END DECLARE @TempStates TABLE (StartTime datetime NOT NULL , EndTime datetime NOT NULL , StateIdentity int NOT NULL ) INSERT INTO @TempStates SELECT StartTime , EndTime , StateIdentity FROM State WHERE StartTime <= @EndTime AND EndTime >= @StartTime RETURN 0 END

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