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  • Database for Large number of 1kB data chunks (MySQL?)

    - by The Unknown
    I have a very large dataset, each item in the dataset being roughly 1kB in size. The data needs to be queried rapidly by many applications distributed over a network. The dataset has more than a million items (so 500 million+ 1kB data chunks). What would be the best method to storing this dataset (need to allow adding more items, and reading them rapidly, but never modifying already added data)? Would using a MySQL DB using the binary blob format be appropriate? Or should each of these be stored as files on a file system? edit: the number is 1 million items now, but needs to be able to scale to well over 500 million items easily.

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  • Are indexes good or bad for a large database?

    - by gmemon
    Hello All, I read on MySQL Performance Blog that when tables are large, it is better to scan full tables, instead of using indexes. I have a table with tens of millions of rows. When conducting queries, if I use no indexes, then queries are 24 times slower than with indexes. I know lot of things may cause this (e.g., are rows stored sequentially), but can you please give me some hints what might be happening? Or how I should start examining this issue? I want to understand when use of indexes is preferred and when it's not Thanks

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  • What are the best practices for importing large datasets into MongoDB?

    - by snl
    We are just giving MongoDB a test run and have set up a Rails 3 app with Mongoid. What are the best practices for inserting large datasets into MongoDB? To flesh out a scenario: Say, I have a book model and want to import several million records from a CSV file. I suppose this needs to be done in the console, so this may possibly not be a Ruby-specific question. Edited to add: I assume it makes a huge difference whether the imported data includes associations or is supposed to go into one model only. Any comments on either scenario welcome.

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  • iPhone SDK: Downloading large files from a server into the app's documents.

    - by Jessica
    Hi, I am building an app that plays multiple video files, But I would like to know How do you download a video file (100mb - 300mb) from a server into the application's documents so it can later be locally referred to in code? The reason I want this type of a set up in my app is that I don't want the app binary to be made unnecessarily large due to including videos some users may not want. Also does this violate any of apple's terms? Also would it be simple to implement a progress view with this kind of set up and if so how? Any help is appreciated.

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  • Good way to send a large file over a network in C#?

    - by BFreeman
    I am trying to build an application that can request files from a service running on another machine in the network. These files can be fairly large (500mb + at times). I was looking into sending it via TCP but I'm worried that it may require that the entire file be stored in memory. There will probably only be one client. Copying to a shared directory isn't acceptable either. The only communication required is for the client to say "gimme xyz" and the server to send it (and whatever it takes to ensure this happens correctly). Any suggestions?

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  • C++ - Efficient container for large amounts of searchable data?

    - by Francisco P.
    Hello, everybody! I am implementing a text-based version of Scrabble for a College project. My dictionary is quite large, weighing in at around 400.000 words (std::string). Searching for a valid word will suck, big time, in terms of efficiency if I go for a vector<string> ( O(n) ). Are there any good alternatives? Keep in mind, I'm enrolled in freshman year. Nothing TOO complex! Thanks for your time! Francisco

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  • What's the most efficient way to manage large datasets with Javascript/jQuery in IE?

    - by RenderIn
    I have a search that returns JSON, which I then transform into a HTML table in Javascript. It repeatedly calls the jQuery.append() method, once for each row. I have a modern machine, and the Firefox response time is acceptable. But in IE 8 it is unbearably slow. I decided to move the transformation from data to HTML into the server-side PHP, changing the return type from JSON to HTML. Now, rather than calling the jQuery.append() time repeatedly, I call the jQuery.html() method once with the entire table. I noticed Firefox got faster, but IE got slower. These results are anecdotal and I have not done any benchmarking, but the IE performance is very disappointing. Is there something I can do to speed up the manipulation of large amounts of data in IE or is it simply a bad idea to process very much data at once with AJAX/Javascript?

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  • PHP: How to begin testing large, existing codebase, and test for regression on production site?

    - by anonymous coward
    I'm in charge of at least one large body of existing PHP code, that desperately needs tests, and as well I need some method of checking the production site for errors. I've been working with PHP for many years, but am unfortunately new to testing. (Sorry!). While writing tests for code that has predictable outcomes seems easy enough, I'm having trouble wrapping my head around just how I can test the live site, to ensure proper output. I know that in a test environment, I could set up the database in a known state... but are there proper methods or techniques for testing a live site? Where should I begin? [I am aware of PHPUnit and SimpleTest, but haven't chosen one over the other yet]

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  • How to transfer large file (File size > Heap Size) over the network?

    - by neo
    How to transfer large file (File size Heap/RAM Size) over the network ? Lets say I have file (size 10GB) I want to transfer it machine a (RAM 512mb) to machine b (RAM 512mb). Want achieve this using java code. First, is it possible ? Any recommendation on framework. If possible, can we speed this up using threading ? Important criteria: file's data sequence needs to be maintained during transfer. Any example will be great help.

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  • How to manage memory for ios with large csv files?

    - by Pell000
    I'm new to ios development, and I'm running into issues relating to memory management and my approaches to dealing with large datasets. Right now, I am loading the csv files and storing the relevant data as objects in memory at app initialization. Some of the csv files are larger than 1MB, and in total, my app uses about 180MB of memory. This is obviously way too high of a number (unless the info I found is wrong and this is an acceptable number, then please let me know). I feel as though there is a fundamental flaw in my approach: is there a way I can avoid storing the csv files in the project itself? Or, is there a kind of "lazy" loading I can do so that I can simply look up info in the csv file, as opposed to loading all of the data from it at once? Any help would do. I think that I need a new perspective in how to manage this more efficiently.

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  • Insert random <script> for using $(document).ready(function()}); in Joomla

    - by Anriëtte Combrink
    Hi I have an article in which I use PHP code inside the text editor in Joomla, in the backend. I can see jQuery already called when the page loads, here is my code inside the Article edit textbox: <?php $username="XXX"; $password="XXX"; $database="XXX"; mysql_connect('localhost',$username,$password) or die(mysql_error()); mysql_select_db($database) or die("Unable to select database"); $result=mysql_query("SELECT * FROM birthdays ORDER BY name") or die(mysql_error()); echo "<table width='100%' cellspacing='10' cellpadding='0' border='0'>"; echo "<tr valign='top'><th align='left'></th><th align='left'>Name</th><th align='left'>Email</th><th align='left'>Day</th><th align='left'>Month</th></tr><tr><td>&nbsp;</td></tr>"; while ($row = mysql_fetch_array($result)) { echo "<tr>"; echo '<td valign="top"><a href="#" id="'.$row['id'].'" class="delete_birthday"><img src="administrator/components/com_media/images/remove.png" alt="Delete user" /></a><input type="hidden" name="id[]" value="'.$row['id'].'" /></td>'; echo "<td valign='top' style='border-bottom:1px dotted #333333; padding:2px;'>"; echo $row['name']; echo "</td>"; echo "<td valign='top' style='border-bottom:1px dotted #333333; padding:2px;'>"; echo $row['email']; echo "</td>"; echo "<td align='center' valign='top' style='border-bottom:1px dotted #333333; padding:2px;'>"; echo $row['birthday']; echo "</td>"; echo "<td align='center' valign='top' style='border-bottom:1px dotted #333333; padding:2px;'>"; echo $row['birthmonth']; echo "</td>"; echo "</tr>"; } echo "</table>"; ?> <script type="text/javascript"> $(document).ready(function() { alert("hello"); }); </script> At the moment, nothing alerts (just alerting for testing if jQuery gets recognised, I am obviously going to put in click handlers), so I assume the $(document).ready() never gets triggered. I can see the code in the source, but it just never gets called. Anybody have any advice? BTW. the SC jQuery plugin is installed already to prevent library conflicts.

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  • LibreOffice UNO Java API: how to open a document, execute a macro and close it?

    - by MarcoS
    I'm working on LibreOffice server-side: on the server I run soffice --accept=... Then I use Java LibreOffice client API's to apply a macro on a document (calc or writer). The java execution does not give any error, but I do not get the job done (macro code is executed, but it's effects are not in the output file). More, after macro script is invoked, the Basic debugger window appears, apparently stopped on the first line of my macro; F5 does not restart it... This is the relevant code I'm using: try { XComponentContext xLocalContext = Bootstrap.createInitialComponentContext(null); System.out.println("xLocalContext"); XMultiComponentFactory xLocalServiceManager = xLocalContext.getServiceManager(); System.out.println("xLocalServiceManager"); Object urlResolver = xLocalServiceManager.createInstanceWithContext( "com.sun.star.bridge.UnoUrlResolver", xLocalContext); System.out.println("urlResolver"); XUnoUrlResolver xUrlResolver = (XUnoUrlResolver) UnoRuntime.queryInterface(XUnoUrlResolver.class, urlResolver); System.out.println("xUrlResolve"); try { String uno = "uno:" + unoMode + ",host=" + unoHost + ",port=" + unoPort + ";" + unoProtocol + ";" + unoObjectName; Object rInitialObject = xUrlResolver.resolve(uno); System.out.println("rInitialObject"); if (null != rInitialObject) { XMultiComponentFactory xOfficeFactory = (XMultiComponentFactory) UnoRuntime.queryInterface( XMultiComponentFactory.class, rInitialObject); System.out.println("xOfficeFactory"); Object desktop = xOfficeFactory.createInstanceWithContext("com.sun.star.frame.Desktop", xLocalContext); System.out.println("desktop"); XComponentLoader xComponentLoader = (XComponentLoader)UnoRuntime.queryInterface( XComponentLoader.class, desktop); System.out.println("xComponentLoader"); PropertyValue[] loadProps = new PropertyValue[3]; loadProps[0] = new PropertyValue(); loadProps[0].Name = "Hidden"; loadProps[0].Value = Boolean.TRUE; loadProps[1] = new PropertyValue(); loadProps[1].Name = "ReadOnly"; loadProps[1].Value = Boolean.FALSE; loadProps[2] = new PropertyValue(); loadProps[2].Name = "MacroExecutionMode"; loadProps[2].Value = new Short(com.sun.star.document.MacroExecMode.ALWAYS_EXECUTE_NO_WARN); try { XComponent xComponent = xComponentLoader.loadComponentFromURL("file:///" + inputFile, "_blank", 0, loadProps); System.out.println("xComponent from " + inputFile); String macroName = "Standard.Module1.MYMACRONAME?language=Basic&location=application"; Object[] aParams = null; XScriptProviderSupplier xScriptPS = (XScriptProviderSupplier) UnoRuntime.queryInterface(XScriptProviderSupplier.class, xComponent); XScriptProvider xScriptProvider = xScriptPS.getScriptProvider(); XScript xScript = xScriptProvider.getScript("vnd.sun.star.script:"+macroName); short[][] aOutParamIndex = new short[1][1]; Object[][] aOutParam = new Object[1][1]; @SuppressWarnings("unused") Object result = xScript.invoke(aParams, aOutParamIndex, aOutParam); System.out.println("xScript invoke macro" + macroName); XStorable xStore = (XStorable)UnoRuntime.queryInterface(XStorable.class, xComponent); System.out.println("xStore"); if (outputFileType.equalsIgnoreCase("pdf")) { System.out.println("writer_pdf_Export"); loadProps[0].Name = "FilterName"; loadProps[0].Value = "writer_pdf_Export"; } xStore.storeToURL("file:///" + outputFile, loadProps); System.out.println("storeToURL to file " + outputFile); xComponent.dispose(); xComponentLoader = null; rInitialObject = null; System.out.println("done."); System.exit(0); } catch(IllegalArgumentException e) { System.err.println("Error: Can't load component from url " + inputFile); } } else { System.err.println("Error: Unknown initial object name at server side"); } } catch(NoConnectException e) { System.err.println("Error: Server Connection refused: check server is listening..."); } } catch(java.lang.Exception e) { System.err.println("Error: Java exception:"); e.printStackTrace(); }

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  • How get an Android ListPreference defined in Xml whose values are integers?

    - by Rob Kent
    Is it possible to define a ListPreference in Xml and retrieve the value from SharedPreferences using getInt? Here is my Xml: <ListPreference android:key="@string/prefGestureAccuracyKey" android:title="@string/prefGestureAccuracyTitle" android:summary="@string/prefGestureAccuracyDesc" android:entries="@array/prefNumberAccuracyLabels" android:entryValues="@array/prefNumberAccuracyValues" android:dialogTitle="@string/prefGestureAccuracyDialog" android:persistent="true" android:defaultValue="2" android:shouldDisableView="false" /> And I want to get the value with something like: int val = sharedPrefs.getInt(key, defaultValue). At the moment I have to use getString and parse the result.

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  • Any tools out there that will EXECUTE BPMN 2.0 xml code yet?

    - by processimprover
    Business Process Modeling Notation with version 2.0, an international standard formally approved by OMG, creates XML code that is generated when a person creates a process model in a process modeling tool...like Visio with ITP-Commerce BPM 2.0 add-in. I would like to know if any of you gurus out there have or can create a tool that will take the XML code and EXECUTE it. Anyone? Thanks very much, Randy

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  • Should I use office open xml or rdlc reports?

    - by Si Keep
    I need to provide the facility for a user to download Word and Excel reports from my web site. I was intending to use the Office Open Xml SDK but have just stumbled across RDLC. My question is should I consider RDLC? Does it give me the same flexability that the Office Open Xml SDK does? What are the pro's and cons?

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  • Is it possible to use SQL XML to insert, and get output from each record?

    - by nbolton
    I would like to perform a SQL XML insert (on MSSQL), and in this case I need to insert a list of files into the DB (this is simple enough). However, there's an auto generated PK column (ID), and I need the ID for each newly created filename without performing a 2nd query. Is this possible? I guess it doesn't matter if the result is/isn't XML, but the input certainly has to be.

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