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  • Improve drawingvisual render's speed

    - by Michael Hao
    I create my own FrameworkElement and override VisualChildrenCount{get;} and GetVisualChild(int index) by returning my own DrawingVisual collection instance.I have override OnRender . I will add 20-50 DrawingVisuals in this FrameworkElement ,every DrawingVisual will have 2000 line segments.The logic value of these points between 0 to 60000.when I zoom into 1:1 the FrameworkElement 's Height will be 60000, the rending time will be 15 minutes!! How do I improve the rending performance ?

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  • T-Sql SPROC - Parse C# Datatable to XML in Database (SQL Server 2005)

    - by Goober
    Scenario I've got an application written in C# that needs to dump some data every minute to a database. Because its not me that has written the spec, I have been told to store the data as XML in the SQL Server database and NOT TO USE the "bulk upload" feature. Essentially I just wanted to have a single stored procedure that would take XML (that I would produce from my datatable) and insert it into the database.....and do this every minute. Current Situation I've heard about the use of "Sp_xml_preparedocument" but I'm struggling to understand most of the examples that I've seen (My XML is far narrower than my C Sharp ability). Question I would really appreciate someone either pointing me in the direction of a worthwhile tutorial or helping explain things. EDIT - Using (SQL Server 2005)

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  • Strategies to use Database Sequences?

    - by Bruno Brant
    Hello all, I have a high-end architecture which receives many requests every second (in fact, it can receive many requests every millisecond). The architecture is designed so that some controls rely on a certain unique id assigned to each request. To create such UID we use a DB2 Sequence. Right now I already understand that this approach is flawed, since using the database is costly, but it makes sense to do so because this value will also be used to log information on the database. My team has just found out an increase of almost 1000% in elapsed time for each transaction, which we are assuming happened because of the sequence. Now I wonder, using sequences will serialize access to my application? Since they have to guarantee that increments works the way they should, they have to, right? So, are there better strategies when using sequences? Please assume that I have no other way of obtaining a unique id other than relying on the database.

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  • Finding the string length of a integer in .NET

    - by James Newton-King
    In .NET what is the best way to find the length of an integer in characters if it was represented as a string? e.g. 1 = 1 character 10 = 2 characters 99 = 2 characters 100 = 3 characters 1000 = 4 characters The obvious answer is to convert the int to a string and get its length but I want the best performance possible without the overhead of creating a new string.

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  • Polymorphism in SQL database tables?

    - by Patrick Daryll Glandien
    I currently have multiple tables in my database which consist of the same 'basic fields' like: name character varying(100), description text, url character varying(255) But I have multiple specializations of that basic table, which is for example that tv_series has the fields season, episode, airing, while the movies table has release_date, budget etc. Now at first this is not a problem, but I want to create a second table, called linkgroups with a Foreign Key to these specialized tables. That means I would somehow have to normalize it within itself. One way of solving this I have heard of is to normalize it with a key-value-pair-table, but I do not like that idea since it is kind of a 'database-within-a-database' scheme, I do not have a way to require certain keys/fields nor require a special type, and it would be a huge pain to fetch and order the data later. So I am looking for a way now to 'share' a Primary Key between multiple tables or even better: a way to normalize it by having a general table and multiple specialized tables.

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  • What is a good Visio Enterprise Architect replacement?

    - by MattValerio
    I've been using Visio 2002/2003 Enterprise Architect to do my database schema design visually and then forward-generate the DDL to create the database. I wanted to switch to Visio 2007, but while it does have database diagramming support, it doesn't have the ability to generate DDL. Bummer. I am really disappointed because it seems like Microsoft has completely abandoned this feature. You can't do it in Visual Studio (that I've found). You can sorta do it with SQL Server Management Studio if you insert database diagrams into your database, but any edits to the schema immediately take effect. Has anyone found a good program to do this? I'm hoping to find one that is free and can generate DDL/SQL for SQL Server.

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  • Efficient code to avoid circular references in c# object model

    - by Kumar
    I have an excel like grid where values can be typed referencing other rows To check for circular references when a new value is entered, i traverse the tree and create a list of values referenced thus far, if the current value is found in this list, i return an error thus avoiding a circular reference. This is infrequent enough where extreme performance is not an issue but... Question - is there a better way ? I'm told it's not the most optimal but no answer was provided so on to the experts @ SO :)

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  • Cycles/byte calculations

    - by matskn
    Hi ! In Crypto communities it is common to measure algorithm performance in cycles/byte. My question is, which parameters in the CPU architecture are affecting this number? Except the clockspeed ofcourse :)

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  • Database Error : Compiling app on iphone device

    - by Amarpreet
    Hi guys I am getting a problem when i compile my iphone database application to device. When i debug the code it says database path "out of scope" on the break point and it does not compile the statement. Below is the code i am using to access the database. databaseName = @"Zen.sqlite"; NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES); NSString *documentsDir=[documentPaths objectAtIndex:0]; databasePath=[documentsDir stringByAppendingPathComponent:databaseName]; It works perfectly fine when i use the same code on simulator. Please help me to get this work on iphone device as well. Thanks.

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  • Setting up MySQL database

    - by mathew
    I do have single database and near about 11 tables. while my web page is opening informations from these 11 tables will be accessed same time. according to my current settings what I did now is for each table database is opening and closing. say I had given username and password to open databse for each table and close after retrieving information from that table. Is this the right way to do it?? I feel because of this the database is opeing and closing 11 times!!!! Am I right?? is this the right way to do that?? Oh well I do have some tables which update date is differ from others... THanks Mathew

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  • Update DataBase on clicking in button, after editing gridview (not automatically saving in DB, but a

    - by gaponte69
    0 vote down star I am using GridView in asp .net and editing data with edit command field property (as we know after updating the edited row, we automatically update the database), and I want to use transactions (with begin to commit statement - including rollback) to commit this update query in database, after clicking in some button (after some events for example), not automatically to insert or update the edited data from grid directly to the DB...so I want to save them somewhere temporary (even many edited rows - not just one row) and then to confirm the transaction - to update the real tables in database... Any suggestions are welcomed... I've used some good links, but very helpful, like: http://www.asp.net/learn/data-access/tutorial-63-cs.aspx http://www.asp.net/learn/data-access/tutorial-66-cs.aspx etc... etc...

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  • Seeting up MySQL database

    - by mathew
    I do have single database and near about 11 tables. while my web page is opening informations from these 11 tables will be accessed same time. according to my current settings what I did now is for each table database is opening and closing. say I had given username and password to open databse for each table and close after retrieving information from that table. Is this the right way to do it?? I feel because of this the database is opeing and closing 11 times!!!! Am I right?? is this the right way to do that?? THanks Mathew

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  • do console apps run faster than windows based app?

    - by omair iqbal
    i am reletivly new to world of programming i have a few performance questions 1. do console apps run faster than windows based app? 2.are languages like c and pascal faster than object oriented languages like c++ and delphi?i know language speed depends more on compiler than on language itself but do compilers for prcedural languages like c and pascal produce faster code than oo ones like delphi,c++(including c++ compilers that can procuce c code) sorry for my bad english

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  • Convert data retrieved from MySQL database into JSON object using Python/Django

    - by rohanbk
    I have a MySQL database called People which contains the following schema <id,name,foodchoice1,foodchoice2>. The database contains a list of people and the two choices of food they wish to have at a party (for example). I want to create some kind of Python web-service that will output a JSON object. An example of output should be like: { "guestlist": [ {"id":1,"name":"Bob","choice1":"chicken","choice2":"pasta"},{"id":2,"name":"Alice","choice1":"pasta","choice2":"chicken"} ], "partyname": "My awesome party", "day": "1", "month": "June", "2010": "null" } Basically every guest is stored into a dictionary 'guestlist' along with their choices of food. At the end of the JSON object is just some additional information that only needs to be mentioned once. The question that I have is regarding the method that I need to utilize to grab the data from my database, and create the JSON object. Do I need to use a standard Model/View structure of Django or can I get away with something that is much simpler since what I need to do is really simple?

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  • Are there any drawbacks to using helper :all in Rails

    - by Rob Jones
    In Rails 'helper :all' makes all your helpers 'available' to all your controllers. This is concise and convenient, but does it have any memory and/or performance implications compared to explicitly calling the helpers that each controller actually needs? It's unclear form the docs whether using it involves 'require'ing all those files, or whether autoload is being used. I can't tell from the source in the Rails framework docs. thanks

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  • Forms authentication for users and Windows for Database?

    - by scyonx
    On our production servers, the admins created a WebUser active directory account which is users for anonymous access to IIS and is also used to authenticate database access with our SQL Server instances using Integrated Security=SSPI in the connection string and identity impersonate="true" in the web.config. I've often come across situations where I would like to or even need to use forms authentication. However, I using forms authentication, Integrated Security seems to use the logged in user's credentials to authenticate against the database. In these cases I have changed the connection string to use the credentials of a SQL Server users instead. I would prefer to not have a hard coded username and password in the connection string or rather worse in code. Is it possible to use forms authentication just for user authentication for users and windows authentication with the IIS user for database access? What would be the best practice in such a situation?

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  • Configuring Multiple ASP.NET MVC Sites To Use a Single Database For Authentication/Membership

    - by Maxim Z.
    Is it possible for two or more ASP.NET MVC sites to use a single SQL Server database for authentication and other things? Here's how I'm thinking of setting it up: I will combine the current database of each site into one single database, prefixing the tables with the name of the site they belong to. I currently have authentication tables generated by the asp.net_regsql.exe utility. How should I combine those tables? I'm guessing that the way to do it is to somehow set the "application_id" column in those tables... Thanks in advance.

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  • Is there an equivalent of "OPTION(RECOMPILE)" or "WITH RECOMPILE" for an entire connection?

    - by kamens
    I'm curious. Is there any way to prevent SQL query execution plans from being cached for an entire connection's duration? Can I run a command that basically says, "use OPTION(RECOMPILE) for all subsequent commands until I tell you to stop doing so?" I'm acutely aware of all the performance trade-offs here, and I know this is not a step to be taken lightly. However, I'm in a unique situation where this behavior may be advantageous.

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  • Oracle Database character set issue with the audit tables on Debian

    - by Leonid Shirmanov
    I've got Oracle XE installed on Debian linux and the character set is configured to AL32UTF8. There are several client applications that connects to a database from Windows with the different locales - French etc, not English. That's ok with all the client data these applications put into database, nothing converted and text data in French represents correctly. But texts in audit tables looks like '??????' if contains any not-english character. I suppose this is because audit records go to database in the different locale and it's not dependent on the client's globalization/locale settings. How this globalization issue can be fixed? thanks!

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  • Do console apps run faster than GUI apps?

    - by omair iqbal
    I am relatively new to world of programming. I have a few performance questions: Do console apps run faster than apps with a graphical user interface? Are languages like C and Pascal faster than object oriented languages like C++ and Delphi? I know language speed depends more on compiler than on language itself, but do compilers for procedural languages produce faster code than OO ones (including C++ compilers that can produce C code)?

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