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  • Linux System Programming

    - by AJ
    I wanted to get into systems programming for linux and wanted to know how to approach that and where to begin. I come from a web development background (Python, PHP) but I also know some C and C++. Essentially, I would like to know: Which language(s) to learn and pursue (I think mainly C and C++)? How/Where to learn those languages specific to Systems Programming? Books, websites, blogs, tutorials etc. Any other good places where I can start this from basics? Any good libraries to begin with? What environment setup (or approx.) do I need? Assuming linux has to be there but I have a linux box which I rarely log into using GUI (always use SSH). Is GUI a lot more helpful or VI editor is enough? (Please let me know if this part of the question should go to serverfault.com) PS: Just to clarify, by systems programming I mean things like writing device drivers, System tools, write native applications which are not present on Linux platform but are on others, play with linux kernel etc.

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  • Correct Interactive Website System Design Concepts / Methods?

    - by Xandel
    Hi all, I hope this question isn't too open ended, but a nudge in the right direction is all I need! I am currently building an online accounting system - the idea is that users can register, log in, and then create customers, generate invoices and other documents and eventually print / email those documents out. I am a Java programmer but unfortunately haven't had too much experience in web projects and their design concepts... This is what I have got thus far - A Tomcat web server which loads Spring. Spring handles my DAO's and required classes for the business logic. Tomcat serves JSP's containing the pages which make up the website. To make it interactive I have used JavaScript in the pages (jQuery and its AJAX calls) to send and receive JSON data (this is done by posting to a page which calls a handleAction() method in one of my classes). My question is, am I tackling this project in the right way? Am I using the right tools and methods? I understand there are literally countless ways of tackling any project but I would really love to get feedback with regards to tried and tested methods, general practices etc. Thanks in advance! Xandel

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  • Range partition skip check

    - by user289429
    We have large amount of data partitioned on year value using range partition in oracle. We have used range partition but each partition contains data only for one year. When we write a query targeting a specific year, oracle fetches the information from that partition but still checks if the year is what we have specified. Since this year column is not part of the index it fetches the year from table and compares it. We have seen that any time the query goes to fetch table data it is getting too slow. Can we somehow avoid oracle comparing the year values since we for sure know that the partition contains information for only one year.

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  • Profile System: User share the same id

    - by Malcolm Frexner
    I have a strange effect on my site when it is under heavy load. I randomly get the properties of other users settings. I have my own implementation of the profile system so I guess I can not blame the profile system itself. I just need a point to start debugging from. I guess there is a cookie-value that maps to an Profile entry somewhere. Is there any chance to see how this mapping works? Here is my profile provider: using System; using System.Text; using System.Configuration; using System.Web; using System.Web.Profile; using System.Collections; using System.Collections.Specialized; using B2CShop.Model; using log4net; using System.Collections.Generic; using System.Diagnostics; using B2CShop.DAL; using B2CShop.Model.RepositoryInterfaces; [assembly: log4net.Config.XmlConfigurator()] namespace B2CShop.Profile { public class B2CShopProfileProvider : ProfileProvider { private static readonly ILog _log = LogManager.GetLogger(typeof(B2CShopProfileProvider)); // Get an instance of the Profile DAL using the ProfileDALFactory private static readonly B2CShop.DAL.UserRepository dal = new B2CShop.DAL.UserRepository(); // Private members private const string ERR_INVALID_PARAMETER = "Invalid Profile parameter:"; private const string PROFILE_USER = "User"; private static string applicationName = B2CShop.Model.Configuration.ApplicationConfiguration.MembershipApplicationName; /// <summary> /// The name of the application using the custom profile provider. /// </summary> public override string ApplicationName { get { return applicationName; } set { applicationName = value; } } /// <summary> /// Initializes the provider. /// </summary> /// <param name="name">The friendly name of the provider.</param> /// <param name="config">A collection of the name/value pairs representing the provider-specific attributes specified in the configuration for this provider.</param> public override void Initialize(string name, NameValueCollection config) { if (config == null) throw new ArgumentNullException("config"); if (string.IsNullOrEmpty(config["description"])) { config.Remove("description"); config.Add("description", "B2C Shop Custom Provider"); } if (string.IsNullOrEmpty(name)) name = "b2c_shop"; if (config["applicationName"] != null && !string.IsNullOrEmpty(config["applicationName"].Trim())) applicationName = config["applicationName"]; base.Initialize(name, config); } /// <summary> /// Returns the collection of settings property values for the specified application instance and settings property group. /// </summary> /// <param name="context">A System.Configuration.SettingsContext describing the current application use.</param> /// <param name="collection">A System.Configuration.SettingsPropertyCollection containing the settings property group whose values are to be retrieved.</param> /// <returns>A System.Configuration.SettingsPropertyValueCollection containing the values for the specified settings property group.</returns> public override SettingsPropertyValueCollection GetPropertyValues(SettingsContext context, SettingsPropertyCollection collection) { string username = (string)context["UserName"]; bool isAuthenticated = (bool)context["IsAuthenticated"]; //if (!isAuthenticated) return null; int uniqueID = dal.GetUniqueID(username, isAuthenticated, false, ApplicationName); SettingsPropertyValueCollection svc = new SettingsPropertyValueCollection(); foreach (SettingsProperty prop in collection) { SettingsPropertyValue pv = new SettingsPropertyValue(prop); switch (pv.Property.Name) { case PROFILE_USER: if (!String.IsNullOrEmpty(username)) { pv.PropertyValue = GetUser(uniqueID); } break; default: throw new ApplicationException(ERR_INVALID_PARAMETER + " name."); } svc.Add(pv); } return svc; } /// <summary> /// Sets the values of the specified group of property settings. /// </summary> /// <param name="context">A System.Configuration.SettingsContext describing the current application usage.</param> /// <param name="collection">A System.Configuration.SettingsPropertyValueCollection representing the group of property settings to set.</param> public override void SetPropertyValues(SettingsContext context, SettingsPropertyValueCollection collection) { string username = (string)context["UserName"]; CheckUserName(username); bool isAuthenticated = (bool)context["IsAuthenticated"]; int uniqueID = dal.GetUniqueID(username, isAuthenticated, false, ApplicationName); if (uniqueID == 0) { uniqueID = dal.CreateProfileForUser(username, isAuthenticated, ApplicationName); } foreach (SettingsPropertyValue pv in collection) { if (pv.PropertyValue != null) { switch (pv.Property.Name) { case PROFILE_USER: SetUser(uniqueID, (UserInfo)pv.PropertyValue); break; default: throw new ApplicationException(ERR_INVALID_PARAMETER + " name."); } } } UpdateActivityDates(username, false); } // Profile gettters // Retrieve UserInfo private static UserInfo GetUser(int userID) { return dal.GetUser(userID); } // Update account info private static void SetUser(int uniqueID, UserInfo user) { user.UserID = uniqueID; dal.SetUser(user); } // UpdateActivityDates // Updates the LastActivityDate and LastUpdatedDate values // when profile properties are accessed by the // GetPropertyValues and SetPropertyValues methods. // Passing true as the activityOnly parameter will update // only the LastActivityDate. private static void UpdateActivityDates(string username, bool activityOnly) { dal.UpdateActivityDates(username, activityOnly, applicationName); } /// <summary> /// Deletes profile properties and information for the supplied list of profiles. /// </summary> /// <param name="profiles">A System.Web.Profile.ProfileInfoCollection of information about profiles that are to be deleted.</param> /// <returns>The number of profiles deleted from the data source.</returns> public override int DeleteProfiles(ProfileInfoCollection profiles) { int deleteCount = 0; foreach (ProfileInfo p in profiles) if (DeleteProfile(p.UserName)) deleteCount++; return deleteCount; } /// <summary> /// Deletes profile properties and information for profiles that match the supplied list of user names. /// </summary> /// <param name="usernames">A string array of user names for profiles to be deleted.</param> /// <returns>The number of profiles deleted from the data source.</returns> public override int DeleteProfiles(string[] usernames) { int deleteCount = 0; foreach (string user in usernames) if (DeleteProfile(user)) deleteCount++; return deleteCount; } // DeleteProfile // Deletes profile data from the database for the specified user name. private static bool DeleteProfile(string username) { CheckUserName(username); return dal.DeleteAnonymousProfile(username, applicationName); } // Verifies user name for sise and comma private static void CheckUserName(string userName) { if (string.IsNullOrEmpty(userName) || userName.Length > 256 || userName.IndexOf(",") > 0) throw new ApplicationException(ERR_INVALID_PARAMETER + " user name."); } /// <summary> /// Deletes all user-profile data for profiles in which the last activity date occurred before the specified date. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are deleted.</param> /// <param name="userInactiveSinceDate">A System.DateTime that identifies which user profiles are considered inactive. If the System.Web.Profile.ProfileInfo.LastActivityDate value of a user profile occurs on or before this date and time, the profile is considered inactive.</param> /// <returns>The number of profiles deleted from the data source.</returns> public override int DeleteInactiveProfiles(ProfileAuthenticationOption authenticationOption, DateTime userInactiveSinceDate) { string[] userArray = new string[0]; dal.GetInactiveProfiles((int)authenticationOption, userInactiveSinceDate, ApplicationName).CopyTo(userArray, 0); return DeleteProfiles(userArray); } /// <summary> /// Retrieves profile information for profiles in which the user name matches the specified user names. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="usernameToMatch">The user name to search for.</param> /// <param name="pageIndex">The index of the page of results to return.</param> /// <param name="pageSize">The size of the page of results to return.</param> /// <param name="totalRecords">When this method returns, contains the total number of profiles.</param> /// <returns>A System.Web.Profile.ProfileInfoCollection containing user-profile information // for profiles where the user name matches the supplied usernameToMatch parameter.</returns> public override ProfileInfoCollection FindProfilesByUserName(ProfileAuthenticationOption authenticationOption, string usernameToMatch, int pageIndex, int pageSize, out int totalRecords) { CheckParameters(pageIndex, pageSize); return GetProfileInfo(authenticationOption, usernameToMatch, null, pageIndex, pageSize, out totalRecords); } /// <summary> /// Retrieves profile information for profiles in which the last activity date occurred on or before the specified date and the user name matches the specified user name. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="usernameToMatch">The user name to search for.</param> /// <param name="userInactiveSinceDate">A System.DateTime that identifies which user profiles are considered inactive. If the System.Web.Profile.ProfileInfo.LastActivityDate value of a user profile occurs on or before this date and time, the profile is considered inactive.</param> /// <param name="pageIndex">The index of the page of results to return.</param> /// <param name="pageSize">The size of the page of results to return.</param> /// <param name="totalRecords">When this method returns, contains the total number of profiles.</param> /// <returns>A System.Web.Profile.ProfileInfoCollection containing user profile information for inactive profiles where the user name matches the supplied usernameToMatch parameter.</returns> public override ProfileInfoCollection FindInactiveProfilesByUserName(ProfileAuthenticationOption authenticationOption, string usernameToMatch, DateTime userInactiveSinceDate, int pageIndex, int pageSize, out int totalRecords) { CheckParameters(pageIndex, pageSize); return GetProfileInfo(authenticationOption, usernameToMatch, userInactiveSinceDate, pageIndex, pageSize, out totalRecords); } /// <summary> /// Retrieves user profile data for all profiles in the data source. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="pageIndex">The index of the page of results to return.</param> /// <param name="pageSize">The size of the page of results to return.</param> /// <param name="totalRecords">When this method returns, contains the total number of profiles.</param> /// <returns>A System.Web.Profile.ProfileInfoCollection containing user-profile information for all profiles in the data source.</returns> public override ProfileInfoCollection GetAllProfiles(ProfileAuthenticationOption authenticationOption, int pageIndex, int pageSize, out int totalRecords) { CheckParameters(pageIndex, pageSize); return GetProfileInfo(authenticationOption, null, null, pageIndex, pageSize, out totalRecords); } /// <summary> /// Retrieves user-profile data from the data source for profiles in which the last activity date occurred on or before the specified date. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="userInactiveSinceDate">A System.DateTime that identifies which user profiles are considered inactive. If the System.Web.Profile.ProfileInfo.LastActivityDate of a user profile occurs on or before this date and time, the profile is considered inactive.</param> /// <param name="pageIndex">The index of the page of results to return.</param> /// <param name="pageSize">The size of the page of results to return.</param> /// <param name="totalRecords">When this method returns, contains the total number of profiles.</param> /// <returns>A System.Web.Profile.ProfileInfoCollection containing user-profile information about the inactive profiles.</returns> public override ProfileInfoCollection GetAllInactiveProfiles(ProfileAuthenticationOption authenticationOption, DateTime userInactiveSinceDate, int pageIndex, int pageSize, out int totalRecords) { CheckParameters(pageIndex, pageSize); return GetProfileInfo(authenticationOption, null, userInactiveSinceDate, pageIndex, pageSize, out totalRecords); } /// <summary> /// Returns the number of profiles in which the last activity date occurred on or before the specified date. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="userInactiveSinceDate">A System.DateTime that identifies which user profiles are considered inactive. If the System.Web.Profile.ProfileInfo.LastActivityDate of a user profile occurs on or before this date and time, the profile is considered inactive.</param> /// <returns>The number of profiles in which the last activity date occurred on or before the specified date.</returns> public override int GetNumberOfInactiveProfiles(ProfileAuthenticationOption authenticationOption, DateTime userInactiveSinceDate) { int inactiveProfiles = 0; ProfileInfoCollection profiles = GetProfileInfo(authenticationOption, null, userInactiveSinceDate, 0, 0, out inactiveProfiles); return inactiveProfiles; } //Verifies input parameters for page size and page index. private static void CheckParameters(int pageIndex, int pageSize) { if (pageIndex < 1 || pageSize < 1) throw new ApplicationException(ERR_INVALID_PARAMETER + " page index."); } //GetProfileInfo //Retrieves a count of profiles and creates a //ProfileInfoCollection from the profile data in the //database. Called by GetAllProfiles, GetAllInactiveProfiles, //FindProfilesByUserName, FindInactiveProfilesByUserName, //and GetNumberOfInactiveProfiles. //Specifying a pageIndex of 0 retrieves a count of the results only. private static ProfileInfoCollection GetProfileInfo(ProfileAuthenticationOption authenticationOption, string usernameToMatch, object userInactiveSinceDate, int pageIndex, int pageSize, out int totalRecords) { ProfileInfoCollection profiles = new ProfileInfoCollection(); totalRecords = 0; // Count profiles only. if (pageSize == 0) return profiles; int counter = 0; int startIndex = pageSize * (pageIndex - 1); int endIndex = startIndex + pageSize - 1; DateTime dt = new DateTime(1900, 1, 1); if (userInactiveSinceDate != null) dt = (DateTime)userInactiveSinceDate; /* foreach(CustomProfileInfo profile in dal.GetProfileInfo((int)authenticationOption, usernameToMatch, dt, applicationName, out totalRecords)) { if(counter >= startIndex) { ProfileInfo p = new ProfileInfo(profile.UserName, profile.IsAnonymous, profile.LastActivityDate, profile.LastUpdatedDate, 0); profiles.Add(p); } if(counter >= endIndex) { break; } counter++; } */ return profiles; } } } This is how I use it in the controller: public ActionResult AddTyreToCart(CartViewModel model) { string profile = Request.IsAuthenticated ? Request.AnonymousID : User.Identity.Name; } I would like to debug: How can 2 users who provide different cookies get the same profileid? EDIT Here is the code for getuniqueid public int GetUniqueID(string userName, bool isAuthenticated, bool ignoreAuthenticationType, string appName) { SqlParameter[] parms = { new SqlParameter("@Username", SqlDbType.VarChar, 256), new SqlParameter("@ApplicationName", SqlDbType.VarChar, 256)}; parms[0].Value = userName; parms[1].Value = appName; if (!ignoreAuthenticationType) { Array.Resize(ref parms, parms.Length + 1); parms[2] = new SqlParameter("@IsAnonymous", SqlDbType.Bit) { Value = !isAuthenticated }; } int userID; object retVal = null; retVal = SqlHelper.ExecuteScalar(ConfigurationManager.ConnectionStrings["SQLOrderB2CConnString"].ConnectionString, CommandType.StoredProcedure, "getProfileUniqueID", parms); if (retVal == null) userID = CreateProfileForUser(userName, isAuthenticated, appName); else userID = Convert.ToInt32(retVal); return userID; } And this is the SP: CREATE PROCEDURE [dbo].[getProfileUniqueID] @Username VarChar( 256), @ApplicationName VarChar( 256), @IsAnonymous bit = null AS BEGIN SET NOCOUNT ON; /* [getProfileUniqueID] created 08.07.2009 mf Retrive unique id for current user */ SELECT UniqueID FROM dbo.Profiles WHERE Username = @Username AND ApplicationName = @ApplicationName AND IsAnonymous = @IsAnonymous or @IsAnonymous = null END

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  • Error installing scipy on Mountain Lion with Xcode 4.5.1

    - by Xster
    Environment: Mountain Lion 10.8.2, Xcode 4.5.1 command line tools, Python 2.7.3, virtualenv 1.8.2 and numpy 1.6.2 When installing scipy with pip install -e "git+https://github.com/scipy/scipy#egg=scipy-dev" on a fresh virtualenv. llvm-gcc: scipy/sparse/linalg/eigen/arpack/ARPACK/FWRAPPERS/veclib_cabi_c.c In file included from /System/Library/Frameworks/vecLib.framework/Headers/vecLib.h:43, from /System/Library/Frameworks/Accelerate.framework/Headers/Accelerate.h:20, from scipy/sparse/linalg/eigen/arpack/ARPACK/FWRAPPERS/veclib_cabi_c.c:2: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:51:23: error: immintrin.h: No such file or directory In file included from /System/Library/Frameworks/vecLib.framework/Headers/vecLib.h:43, from /System/Library/Frameworks/Accelerate.framework/Headers/Accelerate.h:20, from scipy/sparse/linalg/eigen/arpack/ARPACK/FWRAPPERS/veclib_cabi_c.c:2: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h: In function ‘vceilf’: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:53: error: incompatible types in return /System/Library/Frameworks/vecLib.framework/Headers/vfp.h: In function ‘vfloorf’: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:54: error: incompatible types in return /System/Library/Frameworks/vecLib.framework/Headers/vfp.h: In function ‘vintf’: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:55: error: ‘_MM_FROUND_TRUNC’ undeclared (first use in this function) /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:55: error: (Each undeclared identifier is reported only once /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:55: error: for each function it appears in.) /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:55: error: incompatible types in return /System/Library/Frameworks/vecLib.framework/Headers/vfp.h: In function ‘vnintf’: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:56: error: ‘_MM_FROUND_NINT’ undeclared (first use in this function) /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:56: error: incompatible types in return In file included from /System/Library/Frameworks/vecLib.framework/Headers/vecLib.h:43, from /System/Library/Frameworks/Accelerate.framework/Headers/Accelerate.h:20, from scipy/sparse/linalg/eigen/arpack/ARPACK/FWRAPPERS/veclib_cabi_c.c:2: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:51:23: error: immintrin.h: No such file or directory In file included from /System/Library/Frameworks/vecLib.framework/Headers/vecLib.h:43, from /System/Library/Frameworks/Accelerate.framework/Headers/Accelerate.h:20, from scipy/sparse/linalg/eigen/arpack/ARPACK/FWRAPPERS/veclib_cabi_c.c:2: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h: In function ‘vceilf’: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:53: error: incompatible types in return /System/Library/Frameworks/vecLib.framework/Headers/vfp.h: In function ‘vfloorf’: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:54: error: incompatible types in return /System/Library/Frameworks/vecLib.framework/Headers/vfp.h: In function ‘vintf’: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:55: error: ‘_MM_FROUND_TRUNC’ undeclared (first use in this function) /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:55: error: (Each undeclared identifier is reported only once /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:55: error: for each function it appears in.) /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:55: error: incompatible types in return /System/Library/Frameworks/vecLib.framework/Headers/vfp.h: In function ‘vnintf’: /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:56: error: ‘_MM_FROUND_NINT’ undeclared (first use in this function) /System/Library/Frameworks/vecLib.framework/Headers/vfp.h:56: error: incompatible types in return error: Command "/usr/bin/llvm-gcc -fno-strict-aliasing -Os -w -pipe -march=core2 -msse4 -fwrapv -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -Iscipy/sparse/linalg/eigen/arpack/ARPACK/SRC -I/Users/xiao/.virtualenv/lib/python2.7/site-packages/numpy/core/include -c scipy/sparse/linalg/eigen/arpack/ARPACK/FWRAPPERS/veclib_cabi_c.c -o build/temp.macosx-10.4-x86_64-2.7/scipy/sparse/linalg/eigen/arpack/ARPACK/FWRAPPERS/veclib_cabi_c.o" failed with exit status 1 Is it supposed to be looking for headers from my system frameworks? Is the development version of scipy no longer good for the latest version of Mountain Lion/Xcode?

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  • Is there any way that an export-to-Excel function can be scalable?

    - by MusiGenesis
    Summary: ASP.Net website with a couple hundred users. Data is exported to Excel files which can be relatively large (~5 MB). In the pilot phase (just a few users), we are already seeing occasional errors on the server in the exporting method. Here's the stack trace: System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. --- System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown. at System.IO.MemoryStream.set_Capacity(Int32 value) at System.IO.MemoryStream.EnsureCapacity(Int32 value) at System.IO.MemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Packaging.TrackingMemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Packaging.SparseMemoryStream.WriteAndCollapseBlocks(Byte[ ] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Packaging.SparseMemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Packaging.CompressEmulationStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Packaging.CompressStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Zip.ProgressiveCrcCalculatingStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Zip.ZipIOModeEnforcingStream.Write(Byte[] buffer, Int32 offset, Int32 count) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.IO.StreamWriter.Write(String value) at System.Xml.XmlTextEncoder.Write(String text) at System.Xml.XmlTextWriter.WriteString(String text) at System.Xml.XmlText.WriteTo(XmlWriter w) at System.Xml.XmlAttribute.WriteContentTo(XmlWriter w) at System.Xml.XmlAttribute.WriteTo(XmlWriter w) at System.Xml.XmlElement.WriteTo(XmlWriter w) at System.Xml.XmlElement.WriteContentTo(XmlWriter w) at System.Xml.XmlElement.WriteTo(XmlWriter w) at System.Xml.XmlElement.WriteContentTo(XmlWriter w) at System.Xml.XmlElement.WriteTo(XmlWriter w) at System.Xml.XmlElement.WriteContentTo(XmlWriter w) at System.Xml.XmlElement.WriteTo(XmlWriter w) at System.Xml.XmlDocument.WriteContentTo(XmlWriter xw) at System.Xml.XmlDocument.WriteTo(XmlWriter w) at System.Xml.XmlDocument.Save(Stream outStream) at OfficeOpenXml.ExcelWorksheet.Save() in C:\temp\XXXXXXXXXX\ExcelPackage\ExcelWorksheet.cs:line 605 at OfficeOpenXml.ExcelWorkbook.Save() in C:\temp\XXXXXXXXXX\ExcelPackage\ExcelWorkbook.cs:line 439 at OfficeOpenXml.ExcelPackage.Save() in C:\temp\XXXXXXXXXX\ExcelPackage\ExcelPackage.cs:line 348 at Framework.Exporting.Business.ExcelExport.BuildReport(HttpContext context) at WebUserControl.BtnXLS_Click(Object sender, EventArgs e) in C:\TEMP\XXXXXXXXXX\XXXXXXXXXX\OneList\UserControls\TicketReportExporter. ascx.cs:line 108 at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.Rai sePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace --- at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.XXXXXXXXXXX_aspx.ProcessRequest(HttpContext context) in c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\XXXX\cdf32a52\d1a5eabd\App_Web_enxdwlks.1.cs:line 0 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpAppli cation.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) Even aside from this particular problem, in general exporting to Excel requires the instantiation of huge Excel objects on the server for each request, which I've always assumed to mean disqualifies Excel for "serious" work on a highly-loaded server. Is there any general way to export to Excel in a "light-weight" manner? Would simply streaming the data into a CSV file work for this?

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  • What Does an OS Actually Do?

    - by Ell
    What exactly does an operating system do? I know that operating systems can be programmed, in, for example, C++, but I previously believed that C++ programs must be run under an operating system? Can somebody please explain and give links? thanks in advance, ell

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  • Book review: Microsoft System Center Enterprise Suite Unleashed

    - by BuckWoody
    I know, I know – what’s a database guy doing reading a book on System Center? Well, I need it from time to time. System Center is actually a collection of about 7 different products that you can use to manage and monitor your software and hardware, from drive space through Microsoft Office, UNIX systems, and yes, SQL Server. It’s that last part I care about the most, and so I’ve dealt with Data Protection Manager and System Center Operations Manager (I call it SCOM) in SQL Server. But I wasn’t familiar with the rest of the suite nor was I as familiar as I needed to be with the “Essentials” release – a separate product that groups together the main features of System Center into a single offering for smaller organizations. These companies usually run with a smaller IT shop, so they sometimes opt for this product to help them monitor everything, including SQL Server. So I picked up “Microsoft System Center Enterprise Suite Unleashed” by Chris Amaris and a cast of others. I don’t normally like to get a technical book by multiple authors – I just find that most of the time it’s quite jarring to switch from author to author, but I think this group did pretty well here.  The first chapter on introducing System Center has helped me talk with others about what the product does, and which pieces fit well together with SQL Server. The writing is well done, and I didn’t find a jump from author to author as I went along. The information is sequential, meaning that they lead you from install to configuration and then use. It’s very much a concepts-and-how-to book, and a big one at that – over 950 pages of learning! It was a pretty quick read, though, since I skipped the installation parts and there are lots of screenshots. While I’m not sure you’d be an expert on the product when you finish reading this book, but I would say you’re more than halfway there. I would say it suits someone that learns through examples the best, since they have a lot of step-by-step examples I do recommend that you take a look if you have to interact with this product, or even if you are a smaller shop and you’re the primary IT resource. The last few chapters deal with System Center Essentials, and honestly it was the best part of the book for me. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Need HP recovery partition info

    - by ggambett
    I'm configuring a new HP Pavillion DV4 with a 320 GB disk. I made the recovery DVDs, then did a couple other things (including deleting the recovery partition), and finally decided to restore the system. Unfortunately, the recovery process fails; the three DVDs are read (the recovery program says "Reformatting the Windows partition" and "Copying files required to restore the hard drive") but after it finishes reading the 3rd, and the progress bar reaches 100%, it fails with error 0xe0f00013 - Googling it didn't return anything at all. I'm afraid this may be because I deleted the partitions. So, I'm kindly asking for one of the following, in order of preference, from a HP Pavillion DV4 with a 320 GB hard disk or a similar enough one : 1) A dump of the MBR 2) The type and size of all the partitions in a "new" system so I can try to make a partition table resembling the original one. BTW, I thought the recovery DVDs were supposed to work even if the entire disk was wiped - isn't that the case? Thanks!

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  • Trouble upgrading OSX, because HD doesn't use GUID Partition Table Scheme

    - by Erik Vold
    So I have a intel-based macbook with osx 10.5 and I'm trying to upgrade to 10.6, but when I run the upgrade 'install' I quickly get to a page where I am supposed to 'Select the disk where you want to install Mac OS X' and there is only the one hard drive, so it is auto selected, and below that I see a warning message and the only button available is the 'Go Back' button. The warning message says: "Macintosh HD" can't be used because it doesn't use the GUID Partition Table scheme. Use Disk Utility to change the partition scheme. Select the disk, choose the Partition tab, select the Volume Scheme and then click Options. So I followed the above instructions, and I got to the last step, where I'm supposed to click the 'Options' button, the problem is that I cannot click that button, it is disabled.. So what am I supposed to do?

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  • osx split external hard drive partition

    - by Bart
    Hi, I currently have a 640GB external HD that has 1 partition formatted as HSF+ Now I want to split some of the free space into a new FAT32 partition, without having to reformat the whole HD and losing all my data. I read that I'm supposed to be able to add new partitions in the Hard Disc Utility by clicking the "+" sign, without any loss of data. But in my case the "+" is not clickable and it says that this partition cannot be altered. Can anyone tell me how to proceed. Or is it impossible without reformatting the whole disc? Thanks ps: I'm running osx snow leopard 10.6.6

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  • read and write permission for FAT32 partition in Ubuntu

    - by Dean
    This is a strange problem. I have the following partition table Device Boot Start End Blocks Id System /dev/sda1 * 1 13 102400 7 HPFS/NTFS Partition 1 does not end on cylinder boundary. /dev/sda2 13 5737 45978624 7 HPFS/NTFS /dev/sda3 5738 10600 39062047+ 83 Linux /dev/sda4 10601 19457 71143852+ 5 Extended /dev/sda5 10601 11208 4883728+ 82 Linux swap / Solaris /dev/sda6 11209 15033 30720000 b W95 FAT32 /dev/sda7 15033 19457 35537920 7 HPFS/NTFS I dual boot Win7 (sda2) and Ubuntu (sda3) and wanted to use the FAT23 partition to share files across two OS's. I followed some online tutorial and have done these: sudo mkdir /media/FAT32 sudo chmod 777 /media/FAT32 sudo mount /dev/sda6/ /media/FAT32 after I mounted the file, I can only read but not be able to write to it. I checked the file permission, it becomes: drwxr-xr-x but after I unmounted the it then becomes drwxrwxrwx and I can read and write to it. very strange. I don't know where I've down wrong. Cheers.

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  • many partitions on a single filegroup?¿ does it make sense?

    - by river0
    Hi, I'm designing a datawarehouse solution and I'm a newbie in disk configuration issues, let me explain you. Our storage is spread over 6 storage enlosures having each of them 5 raid-1 disk arrays, and having 2 LUNS defined per each disk array, which makes a total 48 LUNS (this is following Microsoft fast track recommendations for datawarehouse architectures). I would like to partition my data, on other projects I have worked before, we always followed a 1 partition - 1 filegroup rule. On the microsoft fast track recomendations it is advised to create a filegroup and then for that filegroup a data file per each lun... but I pretend to have a week level partitioning... if I apply that rule I think that I'll get too many files and a complex layout. I'm thinking of just creating just one filegroup (with the 48 lun data files), but still create the partitions since I want to keep soem of the benefits of partitions like partition switching... Is this scenario not recommended? What would you suggest?

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  • Unable to see External HDD in Windows Explorer

    - by Jamie Keeling
    I have bought a 320GB External HDD which I want to use with my Playstation3. I know it will only work with a Fat32 file system so using some free HP software it formatted it, unbeknown to me it will only work up to 32GB. After seeing this I panicked, downloaded Partition Wizard Home Edition and deleted the partition. As I was about to create a new partition to put it back to NTFS (I'd just wanted to be able to use it in the first place at this point) I accidently knocked the cable out of my computer for the HDD and after replacing it the External HDD is no longer recognised by the My Computer option, Disk Management asks me to initialise the disc using MBR but it fails saying "Copy protected". Even the partitioning software I previously mentioned can't do anything about it, all it says is "Bad Condition" and I can't perform any operations on it. Would anybody be able to guide me in getting this sorted? I'm terrified i've wasted a perfectly good 320GB HDD.

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  • Exchange 2007 CCR: Logs not replicating to passive node partition

    - by yum_tacos4u
    In my environment I have setup Exchange 2007 in an CCR cluster, mirroring our main servers to a set of servers in passive mode. One of the partitions on the passive node that I have setup for the logs for Exchange 2007 has faulted, causing the partition to be unreadable. I have replaced the partition on the passive node, and setup the drive to mirror the one in active mode, but the logs are not replicating since the change. Is there anyway to force the replication of the new drive for the logs to the new partition? Any idea why the logs are not replicating? Any help or comments is appreciated, and thanks in advance.

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  • Eee PC - Create USB Recovery Drive w/ Files Copied From Recovery Partition

    - by nedm
    I have an Eee PC 1005HAB whose hard disk has failed. I have no recovery CD/DVD, but I did previously back up the contents of the recovery partition, and would like to use them to create a bootable USB to reinstall the factory settings on the new hard drive. Since I simply copied all the files in the recovery partition, rather than hitting F9 during boot and running through the process to create a recovery disk or drive, how do I now use the files to create a bootable USB drive that will do the recovery? In the BIOS I have disabled boot booster and set external drives to the top of the boot priority, but simply copying all the recovery partion files to a usb doesn't allow it to be booted from. I've downloaded the HP utility for creating bootable USB drives and have tried using it to make the USB drive bootable, but I'm not sure what to do with the ghost image and utilities from the recovery partition to get the process to start properly. Thanks in advance for any help.

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  • mini linux to use dd and access HD and/or USB

    - by acidzombie24
    I was thinking about something. I want to install a 7gb partition and store 2 compress disk image and install linux to it. I want it to be light. What i would like to do is hide the grub loader (or anything) and if i want to reformat my PC press a certain key on startup. Which will then load the linux OS and then i can use dd to restore the partition i want I plan to use windows XP and windows 7 as my main OS and virtualize anything else i need (vista, dummy XP for testing, multiple linux distos, etc). Bonus points if you can tell me how to hide the partition in windows so XP and 7 cant touch it

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  • Possible to restore Windows Partition disk image?

    - by kd7iwp
    I have a machine that was dual-booting Windows 7 and Ubuntu 12.04. I used the Disks program in Ubuntu to make a disk image of my windows partition which I saved on an external disk. I then reformatted the main drive and installed Ubuntu 12.10. I created a spare partition and restored that Windows disk image to that partition. Is it possible to boot Windows? I have run boot-repair and Grub now gives me both Ubuntu and Windows options but when I select Windows I get only a black screen with blinking cursor. I ran a Windows recovery disk and ran startup repair but still no luck. I also tried running lilo inside Ubuntu but still can't boot Windows. Any other ideas? PS, I'm on a Netbook with no DVD drive so I can't just reinstall Windows though if that is my only option I can borrow a DVD eventually.

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  • Pysdm has disabled my ability to write to my storage partition

    - by Atlas
    I have a dual boot setup with Windows 7 and Mint 13 Cinnamon. As well as their respective partitions I also have a large one (NTFS) for storing all my music, videos, documents etc. I downloaded pysdm as I was told it would enable me to configure Linux to auto-mount my storage partition. It has indeed been helpful in auto-mounting my storage. However, since installing it I can no longer write to the partition which makes 500GB of my hard drive utterly useless! I've tried to unselect the "Mount file system in read only mode" option, but the program keeps re-checking it after I close that window (and even when I click apply). Why is it doing this and how can I get it to recognise that I need to read AND write on that partition?

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  • linux refused to mount a valid partition

    - by greg
    My setup is a linux box with 1 partition used thought LVM - has been working for years. I add a freeze and after the reboot the partition cannot be mounted: mount -r -t ext3 /dev/pve/data /mnt/pve-data mount: wrong fs type, bad option, bad superblock on /dev/mapper/pve-data, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so However fsck doesn't see any problem with it: fsck.ext3 -fp /dev/pve/data /dev/pve/data: 3024076/60366848 files (0.6% non-contiguous), 156921642/241435648 blocks There's nothing in dmegs nor the syslog. I'm puzzled, what's wrong with my partition? Thanks in advance greg debian 5.0.10 LVM 2.02.39

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  • How to Recover HDD Formatted by "Create a Recovery Drive" Tool of Windows 8.1?

    - by ide
    I have 2 TB USB HDD which had these drives F: about 1 TB with 750 GB data H: about 120 GB with 60 GB data I: about 780 GB with 250 GB data (For TV: It was raw in Windows but visible in the Smart TV) I took 521 MB from last part of H to get new G drive. Then I run "Create a Recovery Drive" tool of Windows 8.1 and chose G drive. It said all data in the drive will be deleted. I thought it is just G drive but it deleted my whole HDD. It created 32 GB new F drive with writing 337 MB on it and rest of HDD is unallocated. I tried these programs to get my first 3 drives but non of them helped for getting 1st partition. TestDisk MiniTool Partition Wizard Home Edition EaseUS Partition Master 9.2.2 (I deleted new F drive volume because it scans only unallocated part) Recuva PC Inspector File Recovery

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  • Different output by df and du

    - by user1263746
    I have an old RHEL 5.5 Box, When I fire df -kh I see that /var is of 49 GB with 100 % usage. But then I go inside the /var cd /var and I fire du -kh I see that only total 300 MBs are used. I am not able to get it. Is is possible that this partition is shared with different partition? I see that /opt is also of 49 GB. I think that they are same partition. I need to free /var to start mysql but there is hardly anything to be deleted. Any pointers?

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  • Recover from a recover partition when F11 doesn't work and windows is corrupt

    - by jherlitz
    I have someones presario V3000 laptop. It has a D drive which is the recovery partition. The user brought it to me and windows would no longer even boot up. I could only reload XP and try to find a way to recover from the recovery partition. However haven't been able to. I read, hold F11 down when booting up, but that didn't do anything, and the other item I read is to create the CDs from the software installed in the OS from the factory. Well that is the OS that went corrupt and is no longer there. A new reloaded version of XP is there now. Is there still a way I can either create recover CD's/DVD's or boot from the recovery partition?

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  • Accidentally replaced the partition table using GParted in UBUNTU

    - by claws
    Hello, This machine has UBUNTU & wINDOWS XP. I'm currently logged into UBUNTU. I was just checking the features of GParted and accidentally clicked Device > Create Partition Table. A default MS-DOS partition table is created. Now if I re-start the Gparted there is nothing. Its showing entire disk as UNALLOCATED space. Lucky thing is All the drives (C:, D:, E:) are currently mounted and I'm in UBUNTU. I guess its possible to re-create the partition table using current status. But I don't know how? Can any one kindly tell me how to do this. This is a lab computer. If its not recoverable. I'm completely screwed!!

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  • Unable to use NTFS partition for Dropbox in Linux

    - by Cristian
    Dropbox won't let me choose the sync folder inside a NTFS partition. First thought I had was mounting and its permissions (the Dropbox installer does let me choose my linux home as the Dropbox home). After searching and trying several other lines, the partition is mounted via fstab with these settings: /dev/sda5 /mnt/documents ntfs-3g uid=1000,gid=100,dmask=027,fmask=137 0 0 I can read and write in the partition, here is a ls output: 24 drwxr-x--- 1 tuxcayc users 24576 Sep 2 06:42 documents I'm using an Arch-based distro (Manjaro) and Dropbox installed via yaourt. I guess it's still some issue with mounting permissions. Any help is appreciated, Thanks.

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