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• python / sqlite - database locked despite large timeouts

  - by Chris Phillips

  Hi, I'm sure I'm missing something pretty obvious, but I can't for the life of me stop my pysqlite scripts crashing out with a database is locked error. I have two scripts, one to load data into the database, and one to read data out, but both will frequently, and instantly, crash depending on what the other is doing with the database at any given time. I've got the timeout on both scripts set to 30 seconds: cx = sqlite.connect("database.sql", timeout=30.0) and think I can see some evidence of the timeouts in that i get what appears to be a timing stamp (e.g 0.12343827e-06 0.1 - and how do I stop that being printed?) dumped occasionally in the middle of my curses formatted output screen, but no delay that ever gets remotely near the 30 second timeout, but still one of the other keeps crashing again and again from this. I'm running RHEL5.4 on a 64 bit 4 cpu HS21 IBM blade, and have heard some mention about issues about multi-threading and am not sure if this might be relevant. Packages in use are sqlite-3.3.6-5 and python-sqlite-1.1.7-1.2.1, and upgrading to newer versions outside of RedHat's official provisions is not a great option for me. Possible, but not desirable due to the environment in general. I have had autocommit=1 on previously on both scripts, but have since disabled on both, and am now cx.commit()ing on the inserting script and not committing on the select script. Ultimately as I only ever have one script actually making any modifications, I don't really see why this locking should ever ever happen. I have noticed that this is significantly worse over time when the database has gotten larger. It was recently at 13mb with 3 equal sized tables, which was about 1 day's worth of data. creating a new file has significantly improved this, which seems understandable, but the timeout ultimately just doesn't seem to be being obeyed. Any pointers very much appreciated. Thanks Chris

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• Oracle Database Information Now Available on the Oracle Mobile Application

  - by jgelhaus

  Oracle Database Information Now Available on the Oracle Mobile Application Now, wherever you are, you can stay connected to the Oracle Database team by downloading the free Oracle mobile application.  It will help you to keep up with the latest Oracle Database news, blog, social media, video, plus much more while you are on the move! News—Track Oracle Database news. Blogs—Participate in an on-going dialog with our Oracle Database bloggers. Social—Keep up with events, webcasts and other announcements via the Oracle Database social channels Video—See clips of Webcasts, executive addresses and keynotes, Oracle Database customers, and much, much more.

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• SO what RDF database do i use?

  - by keisimone

  Hi, i have a similar issue as espoused in http://stackoverflow.com/questions/695752/product-table-many-kinds-of-product-each-product-has-many-parameters i am convinced to use RDF now. but i already have a database in mysql and the code is in php. 1) So what RDF database should I use? 2) do i combine the approach? meaning i have a class table inheritance in the mysql database and just the weird product attributes in the RDF? I dont think i should move everything to a RDF database since it is only just products and the wide array of possible attributes and value that is giving me the problem. 3) what php resources, articles should i look at that will help me better in the creation of this? 4) thank you.

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• Windows Phone 7 DatePicker gotcha

  - by David Turner

  The Silverlight Toolkit for Windows Phone adds some great extra controls for Windows Phone 7, one gotcha that I ran into was that the DatePicker Application Bar icons don’t show up unless you include them in your project. The problem is that your DatePicker ends up looking like this: Tim Heuer mentions this in his blog post about the Silverlight Toolkit for WP7, and as he says, it is documented in the source code: So the problem is that the icons can’t be referenced from the Silverlight Toolkit Assembly, and the solution is that you have to add them to you project in the ‘well known’ / pre-defined location of a top level folder in your project called Toolkit.Content, and you must make sure to mark the icons with a Build Action of  ‘Content’ otherwise it wont work: The result is that your DatePicker will now look like this:

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• My first Windows Phone 7 App: Getting SharePoint Content

  Earlier this week at the Mix10 conference, Microsoft announced the developer story of the Windows Phone 7 Series. As expected, its all about Silverlight! For all the details I highly recommend to watch the recorded keynotes (day 1, day 2). Tonight I could resist trying to build my very first Windows Phone 7 application; the traditional Hello World thingy. Because the developer tools (Visual Studio 2010 and the free Visual Studio 2010 Express) have pretty nice templates, that wasnt much of a challenge....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Resetting or refreshing a database connection

  - by cdonner

  This Android application on Google uses the following method to refresh the database after replacing the database file with a backup: public void resetDbConnection() { this.cleanup(); this.db = SQLiteDatabase.openDatabase( "/data/data/com.totsp.bookworm/databases/bookworm.db", null, SQLiteDatabase.OPEN_READWRITE); } I did not build this app, and I am not sure what happens. I am trying to make this idea work in my own application, but the data appears to be cached by the views, and the app continues to show data from the database that was replaced, even after I call cleanup() and reopen the database. I have to terminate and restart the activity in order to see the new data. I tried to call invalidate on my TabHost view, which pretty much contains everything. I thought that the views would redraw and refresh their underlying data, but this did also not have the expected result. I ended up restarting the activity programmatically, which works, but this seems to be a drastic measure. Is there a better way?

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• SOA Suite 11g Database Growth Management

  - by JuergenKress

  This whitepaper “Oracle SOA Suite 11g Database Growth Management”  has been written to highlight the need to implement an appropriate strategy to manage the growth the of SOA 11g database. The advice presented should facilitate better dialog between SOA and Database administrators when planning database and host requirements Whitepaper Oracle SOA Suite 11g Database Growth Management Advisor Webcast “Oracle SOA Suite 11g Database Growth Management” April 11th 2012 Author: Michael Bousamra Contributing Authors: Deepak Arora Sai Sudarsan Pogaru SOA Partner Community For regular information on Oracle SOA Suite become a member in the SOA Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: SOA Community Forum,SOA Specialization,purging,Michael Bousamra Contributing Authors: Deepak Arora Sai Sudarsan Pogaru,SOA Suite 11g Database Growth Management

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• Phone crash when try to use vibration on Android

  - by Diego Unanue

  Im developing an app that when you click a button the phone has to vibrate, the issue is that the phone just chashes. Saing that I need permitions to vibrate. I've already set this permition in the build.setting (android manifiest). Here is the code build.settings: settings = { orientation = { default = "portrait", supported = { "portrait", } }, iphone = { plist= { CoronaUseIOS7LandscapeOnlyWorkaround = true, CoronaUseIOS7IPadPhotoPickerLandscapeOnlyWorkaround = true, CoronaUseIOS6LandscapeOnlyWorkaround = true, CoronaUseIOS6IPadPhotoPickerLandscapeOnlyWorkaround = true, UIApplicationExitsOnSuspend = false, UIPrerenderedIcon = true, UIStatusBarHidden = false, CFBundleIconFile = "Icon.png", CFBundleIconFiles = { "Icon.png", "[email protected]", "Icon-60.png", "[email protected]", "Icon-72.png", "[email protected]", "Icon-76.png", "[email protected]", "Icon-Small.png", "[email protected]", "Icon-Small-40.png", "[email protected]", "Icon-Small-50.png", "[email protected]", }, }, }, android = { permissions = { { name = ".permission.C2D_MESSAGE", protectionLevel = "signature" }, }, usesPermissions = { "android.permission.INTERNET", "android.permission.VIBRATE", }, }, } the file that uses the vibration is: local onButtonEvent = function (event ) system.vibrate() end I read all post in Corona page without success. Can I see the android manifest to see if the permissions are there. I've read that is a Corona issue not sure.

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• Presenting Windows Phone 8 at Microsoft Store in Orlando, FL

  - by Nikita Polyakov

  Want to see Windows Phone 8 in person yourself? Want see me present a few features live? Want to come chat in person after? Come by Microsoft Store at The Florida Mall in Orlando, FL on Saturday Nov 17th 2012 at 6-7PM. I will be presenting the Windows Phone 8 OS (no developer content) If you come see this presentation and fill out a survey after you get to be in the drawing for Asus VivoTab RT (see official rules) Let me know if you are coming by! Would love to chat :) Event is also posted on Facebook: https://www.facebook.com/events/167104910079987

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• The problem about use the exist sqlite database,

  - by flybirdtt

  I have a sqlite database, and i put this file in "assets" folder. The code like below, Pls help and tell what's wrong in this code, How to use my own sqlite database. public class DataBaseHelper extends SQLiteOpenHelper { private static String DB_PATH = "/data/data/com.SGMalls/databases/"; private static String DB_NAME = "mallMapv2.sqlite"; private SQLiteDatabase myDataBase; private final Context myContext; public DataBaseHelper(Context context) { super(context, DB_NAME, null, 1); this.myContext = context; } public void createDataBase() throws IOException { File dbDir = new File(DB_PATH); if (!dbDir.exists()) { dbDir.mkdir(); } boolean dbExist = checkDataBase(); if (dbExist) { } else { this.getReadableDatabase(); try { copyDataBase(); } catch (IOException e) { throw new Error("Error copying database"); } } close(); } private boolean checkDataBase() { SQLiteDatabase checkDB = null; boolean isnull=false; try { String myPath = DB_PATH + DB_NAME; checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); } catch (SQLiteException e) { // database does't exist yet. } if (checkDB != null) { isnull=true; checkDB.close(); } return isnull; } private void copyDataBase() throws IOException { InputStream myInput = myContext.getAssets().open(DB_NAME); String outFileName = DB_PATH + DB_NAME; OutputStream myOutput = new FileOutputStream(outFileName); byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer)) > 0) { myOutput.write(buffer, 0, length); } // Close the streams myOutput.flush(); myOutput.close(); myInput.close(); } public void openDataBase() throws SQLException { // Open the database String myPath = DB_PATH + DB_NAME; myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); } @Override public synchronized void close() { if (myDataBase != null) myDataBase.close(); super.close(); } @Override public void onCreate(SQLiteDatabase db) { } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } } public class GetData { private static String DB_PATH = "/data/data/com.SGMalls/databases/mallMapv2.sqlite"; // private static String DB_NAME = "mallMapv2.sqlite"; public static ArrayList<Mall> getMalls() { ArrayList<Mall> mallsList = new ArrayList<Mall>(); SQLiteDatabase malldatabase = SQLiteDatabase.openDatabase(DB_PATH, null, SQLiteDatabase.OPEN_READONLY); String queryString="select id,title from malls order by title"; Cursor cursor=malldatabase.rawQuery(queryString, null); if(cursor!=null){ cursor.moveToFirst(); while(!cursor.isLast()){ Mall mall=new Mall(); mall.setMallid(cursor.getInt(0)); mall.setMallname(cursor.getString(0)); mallsList.add(mall); cursor.moveToNext(); } } malldatabase.close(); return mallsList; } } The error message: ERROR/Database(725): sqlite3_open_v2("/data/data/com.SGMalls/databases/ mallMapv2.sqlite", &handle, 1, NULL) failed 03-15 22:34:11.747: ERROR/AndroidRuntime(725): Uncaught handler: thread main exiting due to uncaught exception 03-15 22:34:11.766: ERROR/AndroidRuntime(725): java.lang.Error: Error copying database Thanks very much

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• Windows Phone 7 Developer Tools April 2010 Refresh

  As most of you know at MIX10, we released the first version of the Windows Phone 7 developer tools (which are free) targeting Silverlight and XNA development to the world. This was a community technology preview (CTP) release and targeted Visual Studio 2010 RC at the time (which was the publically available version). Since MIX10, Visual Studio 2010 has released in final form and the phone developer tools team has been working to get a working version finalized. Today is that day weve just made...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Pros and cons of programmatically enforcing foreign key than in database

  - by Jeffrey

  It is causing so much trouble in terms of development just by letting database enforcing foreign key. Especially during unit test I can’t drop table due to foreign key constrains, I need to create table in such an order that foreign key constrain warning won’t get triggered. In reality I don’t see too much point of letting database enforcing the foreign key constrains. If the application has been properly designed there should not be any manual database manipulation other than select queries. I just want to make sure that I am not digging myself into a hole by not having foreign key constrains in database and leaving it solely to the application’s responsibility. Am I missing anything? P.S. my real unit tests (not those that use mocking) will drop existing tables if the structure of underlying domain object has been modified.

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• How to tell the database type checking the file

  - by Click Ok

  My friend have a system to manage customers. The program per si is terrible, and my friend lost contact with the developers. The case is, now my friend lost the access to program (something that the developers say "locked to machine" so when moved to another pc, he lost the access to program and data. I get mission of to try to recover the database, migrating to another database, and create a cool program to my friend. Now I need to discover wich database was used by the developers. I know that the program was made using Visual Basic, because the MSVBVM60.DLL is required. There is some program to read the metadata in the .dat files and discover wich database was used?

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• June Edition - Oracle Database Insider

  - by jgelhaus

  Now available.  The June edition of the Oracle Database Insider includes: NEWS June 10: Oracle CEO Larry Ellison Live on the Future of Database Performance At a live webcast on June 10 at Oracle’s headquarters, Oracle CEO Larry Ellison is expected to announce the upcoming availability of Oracle Database In-Memory, which dramatically accelerates business decision-making by processing analytical queries in memory without requiring any changes to existing applications. Read More New Study Confirms Capital Expenditure Savings with Oracle Multitenant A new study finds that Oracle Multitenant, an option of Oracle Database 12c, drives significant savings in capital expenditures by enabling the consolidation of a large number of databases on the same number or fewer hardware resources. Read More VIDEO Oracle Database 12c: Multitenant Environment with Tom Kyte Tom Kyte discusses Oracle Multitenant, followed by a demo of the multitenant architecture that includes moving a pluggable database (PDB) from one multitenant container database to another, cloning a PDB, and creating a new PDB.  and much more.

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• Why are there so many Database Management Systems?

  - by mr.bio

  Why are there so many Database management systems? I am not an DB expert and I've never thought about using another Database other than mySQL. Programming languages offer different paradigms, so it makes sense to choose a specific language for your purpose. Question What are the factors in choosing a specific Database management system ?

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• Windows Phone 7 Review &ndash; Part 1: LG Quantum

  - by Nikita Polyakov

  As many of my fellow geeks, I ran out and got a retail windows Phone 7 on the first day. Just had to have it :) I’ve had the developer prototypes in my hands for previous 3 months on and off, so I finally wanted to have one I call my own. I’ve rushed the Launch   I’ve checked out both AT&T and T-Mobile offerings on day 1 and decided on a Samsung Focus. Great screen, super light and thin. If you don’t believe me that this phone can compete with the best of the non-Phone 7 offerings - get it in your hand to compare for yourself. I have to say that even though the on-screen keyboard on Windows Phone 7 is one of the best, the amount of text I write on my phone and my expectation of how long that takes for a short reply are very high. Also the phone being so slick and sexy did not feel solid or confident in my hand or pocket. As the dust settled   Arrives the LG Quantum – now on AT&T and worldwide. First impression of the softer plastic, the back battery cover is solid metal - the entire phone feels solid and indestructible! Phone fits just right in my hand, it’s almost too good. It does not feel like it will crack in your jeans. I feel safe holding it and don’t feel like if I or someone were to bump into me walking it’d fly out of my hand. I’ve dropped and had thrown the Focus a few times on accident as it’s weight is negligible. I won’t even dream of lying the first day adjusting to a 3.5’ LCD screen from the Samsung’s blistering bright and poppy AMOLED 4’ was hard. But the colors and sharpness are still very good. I find it almost easier on the eyes actually for day to day use.  I had a chance to lay the phone down in the line with the prototypes and final versions of other phones that had LCD screens – LG makes HTC looks like a budget LCD compared to a high end LCD in the home theatre department. I am consistently complemented by friends that have the HD7 or Surround on how much better my screen looks. The screen just looks like the most color correct phone out of the line up. Even next to Samsung it makes it look oversaturated, but can’t match the true blacks compensating with true white.   Day to Day Usability   What I also noticed that is a huge difference is how much I am not accidently hitting the soft keys at the bottom. I real pain on Focus since holding it in am average size hand already would accidently touch the controls at the bottom. QWERTY keyboard on this phone is great. It’s like the mission for LG is “make it solid!”. Keyboard has a very durable feel.   LG’s has a secret wild card though is the DLNA support. If you seen an ad for it, you should. Imagine this – playing a song from your phone straight to your network connected A/V receiver. Done. Pictures to TV. Done. Video. Done. DLNA works with components that advertise to as well as Windows 7, XBOX 360 and other consoles.  I will write an extensive review of that experience in near future. LG Exclusive apps – from panorama photo taker to voice to text translator and even look-n-type app that works like a backup inverse camera, there is quite a bit there that won’t be found on the other phones. I’ll review those in more detail in another segment. Conclusion So for a quick comparison: If you want a phone that is super thin, light and is core reference of a Windows Phone 7 – Samsung Focus it is. If you want a great phone with solid secure feel, real keyboard, media features - the hands down winner is LG Quantum.   You can pick up the LG Quantum at AT&T in US and worldwide as LG Optimus 7Q.   Final thought: I have not had SmartPhone that I felt was a reliable trusty primary communication device since Samsung BlackJack II, this time the LG got the crown.   [ Disclosure: Phone was provided to me free of charge. That has been the case for all of my phones for years, nothing new - I get them all. ]

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• Pre order Nokia Lumia 900 from AT&T for $99.99 and Walmart for $49.99

  - by Gopinath

  Nokia Lumia 900, the flagship Windows Phone OS smartphone from Nokia is available for pre-order from AT&T Stores. With a two year contract, you can grab the phone by paying $99.99 online and they are expected to ship a day or two earlier than their official launch in AT&T stores across US. Walmart in an aggressive move, is selling Nokia Lumia 900 for just $49.99 with a two year contract. So you save $50 more. Earlier in January of this year, Nokia unveiled its plans of Lumia 900 launch exclusively for American market. Nokia Lumia 900 features a 4.3 inch Clear Black display, sporting a resolution of 800 x 480 pixels, 1.4 GHz Snapdragon processor, Windows Phone 7.5 (Mango) OS, 8 megapixel rear camera with f2.2/28mm Carl Zeiss lens and dual LED flash, auto-focus and HD (720p) video recording, 1 megapixel front-facing camera for video calls, 512 MB RAM, 16 GB internal memory, 14.5 GB user memory and more. Pre-order Nokia Lumia 900 from AT&T and Walmart

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• Database schema for multiple category/product relationship

  - by sree01

  I want to design a database for an e-commerce application with category/subcategory management. Please suggest a database schema where we can create categories and subcategories and add products to those categories. Each product can have multiple categories and we can select products belong to multiple categories using a boolean database query Thanks

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• How to Stress Test the Hard Drives in Your PC or Server

  - by Tim Smith

  You have the latest drives for your server.  You stacked the top-of-the line RAM in the system.  You run effective code for your system.  However, what throughput is your system capable of handling, and can you really trust the capabilities listed by hardware companies? How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• Speaking at Windows Phone 7 Developer Day Sarasota.NET Group - 1/19/2010

  - by Nikita Polyakov

  SarasotaDev January 2011 Meeting Windows Phone 7 Developer Day [note: this meeting starts at 4pm] The meeting date is Wednesday, January 19, 2011 at 4:00pm - 8:00pm. Location: Sarasota Community Foundation, at 2635 Fruitville Rd., Sarasota, FL 34237 (just west of Tuttle on the north side of Fruitville). We will have 3 speakers, including 2 Microsoft MVPs: Kevin Wolf and Nikita Polyakov, and joined by Russ Fustino. They will present various aspects of WinPhone 7 development, from Silverlight UI design, to instrumenting your apps for run-time analytics, through putting your application into the WinPhone Marketplace. There will be plenty of time for questions and discussion, and we're working on a sponsor for pizza. This will be a great session, even if you're not currently developing phone apps.   http://sarasotadev.net

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• database for streets world wide?

  - by fayer

  i use the downloadable geonames database for all countries, states, counties and cities in the world. but i wonder if there is a database for streets? so you could pick: country - state/department/district - (county/region) - city - street in whatever country you like? cause when i do a search for a street in google map i can see all the upper levels (country/region/city). is there a database you could download for mysql for this? there has to be a database for this, cause there are always national companies that provide this kind of information. where did they get it from? thanks in advance!

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• How to access the Picasa (desktop) database?

  - by FerranB

  Is there any way to read the Picasa database? What is the format of the Picasa database? Are there any APIs to access the database?

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• Check how old an Oracle database is?

  - by Jamie

  Hi all, So, we have a mirror of a santized version of the production database. Is there anyway (that you know of) to find out how old the database is? i.e. when the database was put on the Oracle server. Thanks for any help!

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• CREATE mysql database with default InnoDB tables?

  - by memilanuk

  Hello, I've been working on writing a SQL statement to create a MySQL database with several default options, including default character set and default collate. Is it possible to add syntax to make the default engine type for tables in this database to be innodb? I've been looking through the MySQL manual for v.5.1 and I've found the statement 'ENGINE=innodb' which would be appended to a CREATE TABLE statement... but I haven't found anything related to a CREATE DATABASE statement. Is there a normal way to do this as part of the database creation, or does it need to be specified on a table-by-table basis? Thanks, Monte

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• Very long strings as primary keys in a database for caching

  - by Bill Zimmerman

  Hi, I am working on a web app that allows users to create dynamic PDF files based on what they enter into a form (it is not very structured data). The idea is that User 1 enters several words (arbitrary # of words, practically capped of course), for example: A B C D E There is no such string in the database, so I was thinking: Store this string as a primary key in a MySQL database (it could be maybe around 50-100k of text, but usually probably less than 200 words) Generate the PDF file, and create a link to it in the database When the next user requests A B C D E, then I can just serve the file instead of recreating it each time. (simple cache) The PDF is cpu intensive to generate, so I am trying to cache as much as I can... My questions are: Does anyone have any alternative ideas to my approach What will the database performance be like? Is there a better way to design the schema than using the input string as the primary key?

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