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  • Doing a large number of upserts as fast as possible

    - by Jason Swett
    My app (which uses MySQL) is doing a large number of subsequent upserts. Right now my SQL looks like this: INSERT IGNORE INTO customer (name,customer_number,social_security_number,phone) VALUES ('VICTOR H KINDELL','123','123','123') INSERT IGNORE INTO customer (name,customer_number,social_security_number,phone) VALUES ('VICTOR H KINDELL','123','123','123') INSERT IGNORE INTO customer (name,customer_number,social_security_number,phone) VALUES ('VICTOR H KINDELL OR','123','123','123') INSERT IGNORE INTO customer (name,customer_number,social_security_number,phone) VALUES ('TRACY L WALTER PERSONAL REP FOR','123','123','123') INSERT IGNORE INTO customer (name,customer_number,social_security_number,phone) VALUES ('TRACY L WALTER PERSONAL REP FOR','123','123','123') So far I've found INSERT IGNORE to be the fastest way to achieve upserts. Selecting a record to see if it exists and then either updating it or inserting a new one is too slow. Even this is not as fast as I'd like because I need to do a separate statement for each record. Sometimes I'll have around 50,000 of these statements in a row. Is there a way to take care of all of these in just one statement, without deleting any existing records?

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  • Jquery show function issue - not animating or showing the hidden paragraph, why

    - by dave
    Here is the html: $( document ).ready( function( ) { $( "#testing" ).click ( function( ) { $( "#testing2" ).show( "slow" ); } ); } ); Link lksjflksjdlkflskdjflksjdflkjslkjdflk lsdkflksjgliowtjlskdfjlskdfjlskgs lksjlk,.x,cmlkvjlkjlwkeoltklfnjsklkj lksjf.m,.jlkjoliwekjtlkjgkjjlkjlkjll llvalkiwujoitjlkgskjdkgjlsd,fjlsllll Here is the css: testing { width: 100px; height: 50px; border: 1px solid; font-size: 22px; display: block; text-align: center; padding: 25px 0px 0px 0px; } testing2 { display: none; width: 270px; height: 300px; background: yellow; border: 1px solid; } For some reason, when i click the link, it does not show the paragraph #testing2, why?

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  • How to avoid this very heavy query that slows down the application?

    - by Juan Paredes
    Hi, We have a web application running in a production enviroment and at some point the client complained about how slow the application got. When we checked what was going on with the application and the database we discover this "precious" query that was being executed by several users at the same time (thus inflicting an extremely high load on the database server): SELECT NULL AS table_cat, o.owner AS table_schem, o.object_name AS table_name, o.object_type AS table_type, NULL AS remarks FROM all_objects o WHERE o.owner LIKE :1 ESCAPE :"SYS_B_0" AND o.object_name LIKE :2 ESCAPE :"SYS_B_1" AND o.object_type IN(:"SYS_B_2", :"SYS_B_3") ORDER BY table_type, table_schem, table_name Our application does not execute this query, I believe it is an Hibernate internal query. I've found little information on why Hibernate does this extremely heavy query, so any help in how to avoid it very much appreciated! The production enviroment information: Red Hat Enterprise Linux 5.3 (Tikanga), JDK 1.5, web container OC4J (whitin Oracle Application Server), Oracle Database 10.1.0.4, JDBC Driver for JDK 1.2 and 1.3, Hibernate version 3.2.6.ga, connection pool library C3P0 version 0.9.1. Thank you.

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  • bundle .NET dlls to run application in .NET-less machine?

    - by Camilo Martin
    AFAIK, ngen turns MSIL into native code (also reffered to as pre-JIT), however I never payed too much attention at it's startup performance impact. Ngen'd applications still require the .NET base class libraries (the runtime). Since the base class libraries have everything our .NET assemblies need (correct?) would it be possible to ship the framework's DLLs with my ngen'd application so that it does not require the runtime to be installed? (e.g., the scenario for most Windows XP machines) Oh, and please don't bother mentioning Remotesoft's Salamander Linker or Xenocode's Postbuild. They are not for my (and many's) current budget (and they seem to simply bundle the framework in a virtualized enviroinment, which means big download sizes and slow startup times I believe) EDIT: I know now, ngen doesn't do what I thought it did. But is it possible to bundle the .NET files with an application, without using a VM?

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  • Project planning, Note taking tool for developers

    - by iceangel89
    i am looking for a project planning tool that include features like a organizer, todo list, target * deadlines of projects. since i am a developer, it will be good to have a tool that can also do modelling like UML/ERD etc. i am also looking for something that can do note taking. something like a blog with code snipplets - so with syntax highlighting. OneNote etc all does not have code highlighting - the best i can do is use an online syntax highlighter to generate HTML then paste in which is slow. of course its good to have a free/open source tool that has all the features i listed. but its fine to know what paid options are there

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  • RSS parsing last build Date. Fastest way to do so please.

    - by Paul
    Dim myRequest As System.Net.WebRequest = System.Net.WebRequest.Create(url) Dim myResponse As System.Net.WebResponse = myRequest.GetResponse() Dim rssStream As System.IO.Stream = myResponse.GetResponseStream() Dim rssDoc As New System.Xml.XmlDocument() Try rssDoc.Load(rssStream) Catch nosupport As NotSupportedException Throw nosupport End Try Dim rssItems As System.Xml.XmlNodeList = rssDoc.SelectNodes("rss/channel") 'For i As Integer = 0 To rssItems.Count - 1 Dim rssDetail As System.Xml.XmlNode rssDetail = rssItems.Item(0).SelectSingleNode("lastBuildDate") Folks this is what I'm using to parse an RSS feed for the last updated time. Is there a quicker way? Speed seems to be a bit slow on it as it pulls down the entire feed before parsing.

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  • Kink detection in drawn polylines

    - by David Rutten
    Users can sketch in my app using a very simple tool (move mouse while holding LMB). This results in a series of mousemove events and I record the cursor location at each event. The resulting polyline curve tends to be rather dense, with recorded points almost every other pixel. I'd like to smooth this pixelated polyline, but I don't want to smooth intended kinks. So how do I figure out where the kinks are? The image shows the recorded trail (red pixels) and the 'implied' shape as a human would understand it. People tend to slow down near corners, so there is usually even more noise here than on the straight bits.

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  • Using Kate with Simple Build Tool (SBT)

    - by Stefan
    Hello I am working with the Kate editor based on the lack of other good tools for Scala development, I am also using IntelliJ however it still has some bugs, and are slow enough to make me impatient. I have just startet using both Kate and SBT, and in that regard I have a little challenge I hope there is an answer for out there on "The Internet". I am using the standard "Build plugin" in Kate and has changed the commands from make to sbt. This works fine, and I am also getting a error report when the sbt fails during compile time. However I really wish to know if it is possible to integrate the compile errors into Kate such that it would be shown under "Errors and Warnings" instead of just in the output tab, where I have to do a manual search for the compile errors. Im guessing that it has something to do with the format of the output, if that is the case maybe it is "just" a smaller adjustment I need to make to the parsing language.

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  • adding to json property that may or may not exist yet

    - by mmcgrail
    let say i want to do this var dasboard = {}; $('.check').click(function(){ $(this).toggleClass("active").siblings().slideToggle('slow', function() { dashboard['pages']['pagename'][$(this).closest('li').attr("id")]['show'] = $(this).is(":hidden") ? 'collapsed' : 'expanded'; }); } i get an error saying 'dashboard.pages is undefined' is there away to dynamically add 'pages' and the children that follow without having to do the work of checking to see if it is defined first then if its not doing dashboard['pages'] = {}; because sometimes they may already exist and I don't want to have to inspect the tree first i just want to build the branches as needed

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  • Filtering in E4X

    - by FB55
    This is just a simple question. I'm currently using Mozilla's Rhino to develop a little webapp. As one step, I need to get a webpage and filter all of it's nodes. For doing that, I use E4X. I thought I could do this like that: var pnodes = doc..*(p); But that produces an error. How is it done right? (BTW: this is just a step for increasing performance. The code already does well, it's just a bit slow.)

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  • Efficient Map Overlays in and drawing Lines on Android Google Map...

    - by Ahsan
    Hi Friends, I want to do the following and am kind of stuck on these for a few days.... 1) I have used helloItemizedOverlay to add about 150 markers and it gets very very slow.....any idea what to do ? I was thinking about threads....(handler) ... 2) I was trying to draw poly lines ( I have encoded polylines, but have managed to decoded those) that move when I move the map..... 3) I was looking for some sort of a timer class that executes, say, every 1 minute or so.... 4) I was also looking for ways to clear the Google map from all the markers/lines etc.... Thanks a lot... :) - ahsan

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  • Huge EAR deployment

    - by bozo
    Hello all, I'm trying to figure out how to deploy a huge (40-50 MB) EAR file to the server through a rather slow VPN connection. The EAR contains EJB and WAR projects created in Glassfish, and 90% of the file size is from external dependency libraries used. Has anyone came up with a strategy for elegant deployment to production system from Netbeans, where the deployment (over the network) is done only for what is really needed (i.e. just one WAR, not the entire EAR, or just one lib, not the entire libraries subproject). Related to the first point, how to separate external dependency libs from project in Netbeans, so that the project compiles on development machine, but when the EAR/WAR/EJB is created it does not contain all the dependency JARs, which are making it huge. Perhaps we need to write custom ant script? Start using maven? Thank you all for kind answers, Bozo

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  • Scrolling with CSS

    - by Jordan Trulen
    I have 4 tables that need to scroll, they are set up as follows: Table1(static) Table2(Horizontal Scrolling) Table3(Vertical Scrolling) Table4(Horizontal and Vertical Scrolling) Table1 Table2 Table3 Table4 The tricky part of this is that Table 3 and 4 need to keep in sync as this is a listing of data broken out into two tables. Table 2 and 4 are in the same situation. Any ideas? No Javascript please as we have a script that works, but it is far too slow to work. Thanks.

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  • Webservice or WCF for compactframework.

    - by Tan
    Hi iam making a Windows mobile application thats connects to an WCF service with basic httpbinding. The mobile device talks directly to the WCF service by tcp. But the performace is really slow. So i tried to switch the mobile device talking to a Webservice (ASMX) then the webservice talks to WCF service. The respone and performace is much faster. Why is it so. Isnt WCF suppose to be faster and have greater performance then the old webservice. please advice and help.

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  • Simplex noise vs Perlin noise

    - by raRaRa
    I would like to know why Perlin noise is still so popular today after Simplex came out. Simplex noise was made by Ken Perlin himself and it was suppose to take over his old algorithm which was slow for higher dimensions and with better quality (no visible artifacts). Simplex noise came out in 2001 and over those 10 years I've only seen people talk of Perlin noise when it comes to generating heightmaps for terrains, creating procedural textures, et cetera. Could anyone help me out, is there some downside of Simplex noise? I heard rumors that Perlin noise is faster when it comes to 1D and 2D noise, but I don't know if it's true or not. Thanks!

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  • Efficient Map Overlays in on Android Google Map...

    - by Ahsan
    Hi Friends, I want to do the following and am kind of stuck on these for a few days.... 1) I have used helloItemizedOverlay to add about 150 markers and it gets very very slow.....any idea what to do ? I was thinking about threads....(handler) ... 2) I was trying to draw poly lines ( I have encoded polylines, but have managed to decoded those) that move when I move the map.....(the only solution that I found was for Geopoints to be transformed into screen co-ordinates...which wont move if I move the map !) 3) I was looking for some sort of a timer function that executes a given function, say, every 1 minute or so.... 4) I was also looking for ways to clear the Google map from all the markers/lines etc.... Thanks a lot... :) - ahsan

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  • JQUERY Prepending an LI to an UL with Animation

    - by nobosh
    Hello, I have a UL and I'm working to dynamically add a new LI to the top of the UL with some animation. I have the following so far which works ok: $("#container").prepend('<li id="newhere"><input type="checkbox" /><span class="listTitle">Im new here</span><ul></ul></li>').hide().slideDown("slow"); #container is the UL The problem with the above is that is hides the entire UL and then slides the entire UL down and I just want the NEW LI that was prepended to animate. Ideas? thxs

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  • Restful authentication between two GAE apps.

    - by user259349
    Hello everyone, i am trying to write a restful google app engine application (python) that accepts requests only from another GAE that i wrote. I dont like any of the ways that i thought of to get this done, please advice if you know of something better than: Get SSL setup, and simply add the credentials on the request that my consuming app will send. I dont like it cause SSL will slow things down. Security by obsecurity. Add a random number in my request that is in Xmod0, where X is a secret number that both applications know. I just,,,, dont like this. Check the HTTP header to see where is the request coming from. This option is the one that i hate the least, not alot of processing, and spoofing an HTTP request is not really worth it, for my application's data. Is there any other clean solution for this?

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  • use ngen and bundle .NET dlls to run application in .NET-less machine?

    - by Camilo Martin
    AFAIK, ngen turns MSIL into native code (also reffered to as pre-JIT), however I never payed too much attention at it's startup performance impact. Ngen'd applications still require the .NET base class libraries (the runtime). Since the base class libraries have everything our .NET assemblies need (correct?) would it be possible to ship the framework's DLLs with my ngen'd application so that it does not require the runtime to be installed? (e.g., the scenario for most Windows XP machines) Oh, and please don't bother mentioning Remotesoft's Salamander Linker or Xenocode's Postbuild. They are not for my (and many's) current budget (and they seem to simply bundle the framework in a virtualized enviroinment, which means big download sizes and slow startup times I believe)

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  • The advantages and disadvantages of using ORM

    - by JHarley1
    Good Morning, I would like to discuss today the advantages and disadvantages of using ORM (such as ADO.NET). Advantages: Speeds-up Development - eliminates the need for repetitive SQL code. Reduces Development Time. Reduces Development Costs. Overcomes vendor specific SQL differences - the ORM knows how to write vendor specific SQL so you don't have to. Disadvantages: Loss in developer productivity whilst they learn to program with ORM. Developers loose understanding of what the code is actually doing - the developer is more in control using SQL. ORM has a tendency to be slow. ORM fail to compete against SQL queries for complex queries. In summary, I believe that the disadvantages of using an ORM (mainly the reduced time taken to perform repetitive tasks) is far outweighed by the disadvantages of ORM e.g. its difficulty to get to grips with. Can people point out were I am going wrong and suggest any further advantages/disadvantages. Many Thanks, J

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  • Troubleshooting source of heavy resource-usage on a server 2008 running multiple sites

    - by batman_man
    Hi, I am running about 10 asp.net websites on a hosted virtual server. The server runs Server 2008 - each website is backed by its own database running on SQL server 2008 on the same box. Lately the box has seemed really slow. The only kind of discovery i could think of doing was looking in the task manager, where i can see w3wp and sqlserver.exe jumping to 40% cpu usage every 5-10 seconds. What are the steps i can take to determine which of my websites is taking these resources and or what database is getting hit the most? I have of course ssms installed on the machine as well. As you can tell, my sysadmin skills are very very limited - any help would be much appreciated.

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  • Asynchronous email processing in Java web application

    - by Denise
    Hi everyone, I would like to implement asynchronous email sending in my web application when users register for a new account. This is so that if there is a problem or delay in sending the email message (e.g. the mail server is down or the network connection to the mail server is slow) the user won't be kept waiting for the sending to complete. My web app is built using Spring and Hibernate's implementation of JPA. What would be the best and most reliable way for me to implement asynchronous email processing in this web application? I am thinking about persisting the email information in a database table which is then regularly polled by a Quartz (http://www.opensymphony.com/quartz/) scheduled job for updates and when it finds new unsent emails, it attempts to send them. Is this a reasonable way of implementing what I want? Thanks.

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  • How to limit / throttle bandwidth with *multiple* connections

    - by Led
    I'm writing an app in C# that downloads concurrently (in different threads) using multiple connections to multiple servers, and I'd like to be able to limit the used bandwidth. For a single connection the solution would be simple; I'd use the solution posted here : http://www.codeproject.com/KB/IP/Bandwidth_throttling.aspx which calculates a sleep-time for the single connection. I'd like to know what the best way is to do this for multiple connections. Using the ThrottledStream posted above and dividing the bandwidth (say 2MB/sec) evenly among the connections isn't right, if I'd have 3 very slow connections and 1 very fast one they'd all be capped to 512kb/sec, so the fast one won't go above 512kb/sec and the other 3 wouldn't even make that. The preferred solution I think is to cap only the fastest connection(s) so the slower connections are used optimally. Does anyone have any experience with this, example code or any advice ?

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  • How long does a reverse DNS lookup take?

    - by HansA
    How long should I expect a reverse lookup take? 100 milliseconds? 1 second? 10 second? 30 seconds? What's your experience? Why? We're debating adding a feature to our server software which would require a reverse DNS lookup each time a client connects. The lookup would be done synchronously, so I'm worried that it could slow connection-times down a lot. I just wanted to hear other people's experience regarding reverse DNS lookup times.

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  • How to make a secure game in javascript ?

    - by rnaud
    Hello, I'm working on games using javascript some html and css, and I was wondering if there was any way to secure the game so that the user can't just call game.php?result=victory to finish the game and earn some point. As of right now here are the solution I have. For a chance game, start the page with the result already in place, win or loose, then just do some animations to show it, but all the score and win/loose stuff is done server-side. For a battle game, just get the action from the javascript call, and do the damage calculation, reaction of the oponent on the server and just send back the data. but the last solution imply that I will have to send actions each time the user do anything. This might work for a turn by turn battle game, but I think it would be to slow for any other kind of game. So my question is, is there some kind of secure way I can prep my javascript to secure the infomation sent.

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