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• New customer references for Exadata-based projects

  - by Javier Puerta

  Milletech Systems, Inc. shows a large state university how to improve query response times 15-fold using its grant management solution built on Oracle’s Extreme Performance Infrastructure. Read More. Ação Informática helped Valdecard realize a 15-Fold Improvement in Fleet-Management and Benefit Card Data Processing using Oracle Exadata Machine. Read More. Neusoft deployed Benxi Municipal Human Resources and Social Security Bureau’s cloud-based database platform to process social insurance payments 50-times faster using Oracle Exadata Database Machine. Read More.

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• When designing a job queue, what should determine the scope of a job?

  - by Stuart Pegg

  We've got a job queue system that'll cheerfully process any kind of job given to it. We intend to use it to process jobs that each contain 2 tasks: Job (Pass information from one server to another) Fetch task (get the data, slowly) Send task (send the data, comparatively quickly) The difficulty we're having is that we don't know whether to break the tasks into separate jobs, or process the job in one go. Are there any best practices or useful references on this subject? Is there some obvious benefit to a method that we're missing? So far we can see these benefits for each method: Split Job lease length reflects job length: Rather than total of two Finer granularity on recovery: If we lose outgoing connectivity we can tell them all to retry The starting state of the second task is saved to job history: Helps with debugging (although similar logging could be added in single task method) Single Single job to be scheduled: Less processing overhead Data not stale on recovery: If the outgoing downtime is quite long, the pending Send jobs could be outdated

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• Installed 12.04 from CD problems with compiz-core - wont continue - just

  - by user70886

  Installed 12.04 from CD to clean hard drive but on first boot up says problems with compiz-core. Clicked continue with it not installed. After I sent info for help; it came back with some packages are not up to date. Said I need to update compiz-core and libylib2.0-0 Cancelled the process to send info (after second time) but it wont cancel and it wont load the desktop. What do I do now? Right click will let me create a new folder/document or organise desktop by name etc but I cannot see the usual system bar or left menu items. Is there a way to load the terminal and reload the desktop. If this was windows I'd use cntrl alt delete and run explorer to fix the desktop.

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• Amazon-like ecommerce site

  - by Soule

  Hey there, My idea was to make an e-commerce site alot like Amazon. Not exactly cloning it, but since its for a niche market, i need something like it. I was thinking of using Magento or something like that to use it as a base, but I cant figure out how to allow users to: Sign Up for account, get verified by me. Allowed to add items, so they can be searchable. Product Reviews, What can I use to achieve/make this, and what are some suggestions? I can code in PHP and python, thanks!

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• Manual memory allocation and purity

  - by Eonil

  Language like Haskell have concept of purity. In pure function, I can't mutate any state globally. Anyway Haskell fully abstracts memory management, so memory allocation is not a problem here. But if languages can handle memory directly like C++, it's very ambiguous to me. In these languages, memory allocation makes visible mutation. But if I treat making new object as impure action, actually, almost nothing can be pure. So purity concept becomes almost useless. How should I handle purity in languages have memory as visible global object?

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• Force install apt-get

  - by Web Developer

  I tried installing beanstalkd with sudo apt-get install beanstalkd (also with -f option) and I get the following error: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run `apt-get -f install' to correct these: The following packages have unmet dependencies: beanstalkd: Depends: libevent-1.4-2 (>= 1.4.13-stable) but it is not going to be installed mysql-server-5.1: Depends: mysql-client-5.1 (>= 5.1.62-0ubuntu0.10.04.1) but it is not going to be installed Depends: libmysqlclient16 (>= 5.1.21-1) but it is not going to be installed Depends: mysql-server-core-5.1 (>= 5.1.62-0ubuntu0.10.04.1) but it is not going to be installed PreDepends: mysql-common (>= 5.1.62-0ubuntu0.10.04.1) but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

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• Building a Repository Pattern against an EF 5 EDMX Model - Part 1

  - by Juan

  I am part of a year long plus project that is re-writing an existing application for a client.  We have decided to develop the project using Visual Studio 2012 and .NET 4.5.  The project will be using a number of technologies and patterns to include Entity Framework 5, WCF Services, and WPF for the client UI.This is my attempt at documenting some of the successes and failures that I will be coming across in the development of the application.In building the data access layer we have to access a database that has already been designed by a dedicated dba. The dba insists on using Stored Procedures which has made the use of EF a little more difficult.  He will not allow direct table access but we did manage to get him to allow us to use Views.  Since EF 5 does not have good support to do Code First with Stored Procedures, my option was to create a model (EDMX) against the existing database views.   I then had to go select each entity and map the Insert/Update/Delete functions to their respective stored procedure. The next step after I had completed mapping the stored procedures to the entities in the EDMX model was to figure out how to build a generic repository that would work well with Entity Framework 5.  After reading the blog posts below, I adopted much of their code with some changes to allow for the use of Ninject for dependency injection.http://www.tcscblog.com/2012/06/22/entity-framework-generic-repository/ http://www.tugberkugurlu.com/archive/generic-repository-pattern-entity-framework-asp-net-mvc-and-unit-testing-triangle IRepository.cs public interface IRepository : IDisposable where T : class { void Add(T entity); void Update(T entity, int id); T GetById(object key); IQueryable Query(Expression> predicate); IQueryable GetAll(); int SaveChanges(); int SaveChanges(bool validateEntities); } GenericRepository.cs public abstract class GenericRepository : IRepository where T : class { public abstract void Add(T entity); public abstract void Update(T entity, int id); public abstract T GetById(object key); public abstract IQueryable Query(Expression> predicate); public abstract IQueryable GetAll(); public int SaveChanges() { return SaveChanges(true); } public abstract int SaveChanges(bool validateEntities); public abstract void Dispose(); } One of the issues I ran into was trying to do an update. I kept receiving errors so I posted a question on Stack Overflow http://stackoverflow.com/questions/12585664/an-object-with-the-same-key-already-exists-in-the-objectstatemanager-the-object and came up with the following hack. If someone has a better way, please let me know. DbContextRepository.cs public class DbContextRepository : GenericRepository where T : class { protected DbContext Context; protected DbSet DbSet; public DbContextRepository(DbContext context) { if (context == null) throw new ArgumentException("context"); Context = context; DbSet = Context.Set(); } public override void Add(T entity) { if (entity == null) throw new ArgumentException("Cannot add a null entity."); DbSet.Add(entity); } public override void Update(T entity, int id) { if (entity == null) throw new ArgumentException("Cannot update a null entity."); var entry = Context.Entry(entity); if (entry.State == EntityState.Detached) { var attachedEntity = DbSet.Find(id); // Need to have access to key if (attachedEntity != null) { var attachedEntry = Context.Entry(attachedEntity); attachedEntry.CurrentValues.SetValues(entity); } else { entry.State = EntityState.Modified; // This should attach entity } } } public override T GetById(object key) { return DbSet.Find(key); } public override IQueryable Query(Expression> predicate) { return DbSet.Where(predicate); } public override IQueryable GetAll() { return Context.Set(); } public override int SaveChanges(bool validateEntities) { Context.Configuration.ValidateOnSaveEnabled = validateEntities; return Context.SaveChanges(); } #region IDisposable implementation public override void Dispose() { if (Context != null) { Context.Dispose(); GC.SuppressFinalize(this); } } #endregion IDisposable implementation } At this point I am able to start creating individual repositories that are needed and add a Unit of Work.  Stay tuned for the next installment in my path to creating a Repository Pattern against EF5.

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• Is it wrong to use a boolean parameter to determine behavior?

  - by Ray

  I have seen a practice from time to time that "feels" wrong, but I can't quite articulate what is wrong about it. Or maybe it's just my prejudice. Here goes: A developer defines a method with a boolean as one of its parameters, and that method calls another, and so on, and eventually that boolean is used, solely to determine whether or not to take a certain action. This might be used, for example, to allow the action only if the user has certain rights, or perhaps if we are (or aren't) in test mode or batch mode or live mode, or perhaps only when the system is in a certain state. Well there is always another way to do it, whether by querying when it is time to take the action (rather than passing the parameter), or by having multiple versions of the method, or multiple implementations of the class, etc. My question isn't so much how to improve this, but rather whether or not it really is wrong (as I suspect), and if it is, what is wrong about it.

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• nut (UPS) and SSL certificates

  - by Mausy5043

  Today I installed nut on my Ubuntu server (14.03). $ uname -a Linux boson 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux The UPS is connected to another server (called neutron), so I use nut-client to keep tabs on the UPS state. When I do sudo upsc [email protected] I get: Init SSL without certificate database battery.charge: 15 battery.charge.low: 10 battery.charge.warning: 50 battery.date: not set battery.mfr.date: 2012/11/27 : The first line of the output concerns me. I've not seen this on other installations of nut on Debian-based servers. What can I do to get rid of that line? EDIT: This "Init SSL without certificate database" is extra annoying because it is not part of the output of upsc and therefore I cannot grep it out.

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• What happens between sprints?

  - by Steve Bennett

  I'm working on a project loosely following the scrum model. We're doing two week sprints. Something I'm not clear on (and don't have a book to consult) is exactly what is supposed to happen between sprints: there should be some "wrap" process, where the product gets built and delivered, but: how long does this typically take? should the whole team be involved? does it strictly have to finish before developers start working on the next sprint items? is this when code review and testing take place? There are three developers, adding up to about 1 FTE. So the sprints are indeed very short.

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• Detecting right-click on XAML GridView control item

  - by mbrit

  Leaving aside why you would ever want to do this in a touch-centric world, here's how you tell if the right-mouse button has been clicked on a GridView in XAML/WinRT/Metro-style. You have to retrieve a point relative to the UI element you're in, and then query its properties. void itemGridView_PointerPressed(object sender, PointerRoutedEventArgs e) { if (e.GetCurrentPoint(this).Properties.IsRightButtonPressed) { this.BottomAppBar.IsOpen = true; } } (The reason why you might want to do this can be explained by looking at any of the built-in Win8 apps. You can right-click any of the items on any list to bring up a context-sensitive AppBar.)

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• Setup suspend-on-lid-close/Fn+F4 outside of KDE/Gnome?

  - by maxschlepzig

  On current Ubuntu (10.04) suspend-on-lid/Fn+F4 only works if some powermanagement-applet of KDE/gnome is running. But what about suspend-to-lid if you are working on the console or using a non-bloated window-manager? What is the current mechanism to configure suspend-on-lid system wide? What of hald/udev/acpid/foo-kit/random-thing is the right place to hook this feature in? What is the up-to-date command to suspend from the command line/script? echo -n mem > /sys/power/state pm-suspend pmi or something else? Btw, if it matters, I want to configure it on some Thinkpads.

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• Unable to install Emerald theme manager in Ubuntu 12.04?

  - by kernel_panic

  I learnt how to install ETM from here But when i try to install i get `ubu@sanjay-pc:~$ sudo apt-get install git autoconf libtool libwnck1.0-cil-dev libwnck-dev intltool libdecoration0-dev gawk Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming.code The following information may help to resolve the situation: The following packages have unmet dependencies: libdecoration0-dev : Depends: libdecoration0 (= 1:0.9.7.6-0ubuntu1) but 1:0.9.7.8-0ubuntu1 is to be installed E: Unable to correct problems, you have held broken packages. ` Help Needed

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• Getting the front buffer into a gfx mem surface (Dx9)

  - by lapin

  I'm using DirectX 9 to acquire the frontbuffer. There are a couple of ways I know of to get at the front buffer: GetRenderTargetData() GetFrontBufferData() The MSDN page on both of these API calls state that the data is copied from device memory to system memory. I'd like to copy the front buffer surface directly to another graphics memory surface, as I have other manipulations to perform on the acquired surface before returning it to system memory. I'm creating a D3DUSAGE_DYNAMIC texture (gfx mem texture) and calling GetFrontBufferData() to write the front buffer to my textures surface0. Is this valid? Will the operation remain in gfx memory, or will it need to move to system memory and then back to graphics memory? If this is the case, is what I'm trying to achieve possible?

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• Not able to install nspluginwrapper on 64 bit Ubuntu 12.10

  - by user99305

  This is a brand new installation of 64 bit Ubuntu 12.10. I am not able to install nspluginwrapper. Here is the error message that I get: $ sudo apt-get install nspluginwrapper Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: nspluginwrapper : Depends: nspluginviewer (= 1.4.4-0ubuntu4) but it is not installable E: Unable to correct problems, you have held broken packages. I need nspluginwrapper to get Citrix receiver to work.

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• 12.04 server on home network

  - by dustin mantei

  I need advice to help me with a server install, I'm new to ubuntu and linux in general. I have 6 systems in my house, 5 being windows 7 and this laptop that I am typing on is Linux mint 13 Maya. Question is, my wife will not transition to anything. She is stuck in Gates-land. so, can I make a server with ubuntu 12.04 (burnt disc image last night) so that all systems in my home can access and my mother-in-law in another state can also access with a username? That would be awesome and it may convince the war dept (my wife) to change all the systems in my house to ubuntu/linux. Sorry this is so long winded, but all the questions I have seen on this forum don't answer it completely.

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• How to install g++ in Ubuntu 14.04?

  - by Apoorva sahay

  I have recently installed ubuntu 14.04 in virtual box. Now I want to install g++ 4.7 in it. I am trying this command in terminal but its not working. sudo apt-get install g++-4.7 Reading package list... Done Building dependency tree Reading state information... Done E: Unable to locate package g++-4.7 E: Couldn't find any package by regex 'g++-4.7' But I find gcc was there with Ubuntu 14.04 installation itself. How could I install g++ in ubuntu 14.04 and any version of g++ abouve 4.7.2 is fine with me.

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• How to generate Visa checkout token? [on hold]

  - by Muhammad Junaid

  I am on process of creating a Visa checkout plugin but stuck in generating token Here are the token requirment: Format: Alphanumeric; maximum 100 characters in the form of token: x:UNIX_UTC_Timestamp:SHA256_hash, where UNIX_UTC_Timestamp is a UNIX Epoch timestamp SHA256_hash is an SHA256 hash of the following unseparated items: Your shared secret Timestamp from the transaction; exactly the same as UNIX_UTC_Timestamp Resource path (API name). This HTTPS request's query string Note: The query string includes one or more parameters in name-value pair format, whose names are separated from values by equal signs (=); an empty value may be omitted but the name and equal sign must be present. The initial question mark (?) is not included. Note: All parameters must be present. The parameters must be in lexicographic sort order (UTF-8, uppercase hex characters) with parameters separated from each other by an ampersand (&). Note: The query string must be URL encoded (excepting the following characters, per RFC 3986: hyp You can find on Google "visa checkout developer updating 1 px image"

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• 12.04 sound keeps auto-muting when idle

  - by fali

  I just installed 12.04 on an HP8510W. Everything works fine except for one weird behavior which I have noticed. When ever there is no audio playing, the audio mute indicator on the laptop is on. As soon as I start playing a you tube video the mute indicator turns off and I get sound. Here is my pulse audio output which says that the sink is suspended because it is idle: Welcome to PulseAudio! Use "help" for usage information. list-sinks 1 sink(s) available. index: 0 name: <alsa_output.pci-0000_00_1b.0.analog-stereo> driver: <module-alsa-card.c> flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY state: SUSPENDED suspend cause: IDLE I tried running alsamixer, but I don't see the auto-mute option.

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• Updated copy of the OBIEE Tuning whitepaper

  - by inowodwo

  The Product Assurance team have released an updated copy of the OBIEE Tuning Whitepaper. You can find it on the PA blog https://blogs.oracle.com/pa/entry/test or via Support note OBIEE 11g Infrastructure Performance Tuning Guide (Doc ID 1333049.1) https://support.us.oracle.com/oip/faces/secure/km/DocumentDisplay.jspx?id=1333049.1&recomm=Y This new revised document contains following useful tuning items: 1.    New improved HTTP Server caching algorithm. 2.    Oracle iPlanet Web Server tuning parameters. 3.    New tuning parameters settings / values for OPIS/OBIS components.

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• Best practices for Persona development

  - by user12277104

  Over the years, I have created a lot of Personas, I've co-authored a new method for creating them, and I've given talks about best practices for creating your own, so when I saw a call for participation in the OpenPersonas project, I was intrigued. While Jeremy and Steve were calling for persona content, that wasn't something I could contribute -- most of the personas I've created have been proprietary and specific to particular domains of my employers. However, I felt like there were a few things I could contribute: a process, a list of interview questions, and what information good personas should contain. The first item, my process for creating data-driven personas, I've posted as a list of best practices. My next post will be the list of 15 interview questions I use to guide the conversations with people whose data will become the personas. The last thing I'll share is a list of items that need to be part of any good persona artifact -- and if I have time, I'll mock them up in a template or two. 

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• My computer boots up with Ubuntu: How can I tell what's on my hard disk?

  - by Larry Harson

  I've acquired an old laptop (Acer TravelMate 4050 with an Italian keyboard) that boots up with the following options: Ubuntu, with Linux 3.0.0-12-generic Ubuntu, with Linux 3.0.0-12-generic (recovery mode) Memory test (memtest86+) Memory test (memtest86+, serial console 115200) When I choose the first option, the screen just goes blank with a flashing cursor. But I can go into grub command mode by typing 'c'. Now, I want to know what operating system is installed, and the files stored on my computer, so how do I do this? What can I do to maximise the use of this computer in its current state?

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• VMWare Player pauses often

  - by pascal

  I'm using a 64bit Windows 8 inside vmplayer, with 2 virtual processor cores, virtual hard disk resides on a fast local disc and is not preallocated; host CPU is Intel i7 3770, should be capable of hardware virtualisation but I don't know if VMWare uses it; NAT networking; Sound card connected, USB connected, accelerated 3D graphics (NVidia 313.30 on host) My problem is, that the VM often pauses for a few seconds, and then speeds up for a few seconds to reach real time again. Time in the VM actually moves faster after the pause, for example all animations using timers speed up. When running, the vmware-vmx process shows ~150% CPU usage in top, but 0% when pausing (and D state i.e. waiting for IO). iotop shows normal disk writes from vmware-vmx threads, but during pauses, the flush kernel thread uses 99%. Are there some options to try so that VMWare doesn't wait for IO? I've tried a few things available from the GUI but the issue never went away…

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• Estimating costs in a GOAP system

  - by fullwall

  I'm currently developing a GOAP system in Java. An explanation of GOAP can be found at http://web.media.mit.edu/~jorkin/goap.html. Essentially, it's using A* to plot between Actions that mutate the world state. To provide a fair chance for all Actions and Goals to execute, I'm using a heuristic function to estimate the cost of doing something. What is the best way to estimate this cost so that it is comparable to all the other costs? As an example, estimating the cost of running away from an enemy versus attacking it - how should the cost be calculated to be comparable?

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• Going from webforms, VS 2008, 3.5 framework to the "next level" based on my goals

  - by Caveatrob

  I've got a few choices to make as I develop some business websites that will run for the next two to three years. Currently I run ASP.NET 3.5 with Visual Studio 2008. I do my development rather crudely in WebForms because that's what I learned and am most productive with. I don't use Membership or any other frameworks in my projects. I use a simple class that maintains a few session keys for each user based on basic database tables for users and roles. (I have about 3,000 users). So far I've kept the data simple, using ADO.NET against SQL Server and a data access class (Circa 2000, I know) to build my sites. My questions are as follows: Under what conditions would I be better off moving to MVC? Under what conditions would I find LINQ and ORM a better way to go than standard ADO.NET? Would I benefit, in my current state of development, from going from Studio 2008 to Studio 2010?

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