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• Microsoft Sql Server 2008 R2 System Databases

  For a majority of software developers little time is spent understanding the inner workings of the database management systems (DBMS) they use to store data for their applications.  I personally place myself in this grouping. In my case, I have used various versions of Microsoft’s SQL Server (2000, 2005, and 2008 R2) and just recently learned how valuable they really are when I was preparing to deliver a lecture on "SQL Server 2008 R2, System Databases". Microsoft Sql Server 2008 R2 System DatabasesSo what are system databases in MS SQL Server, and why should I know them? Microsoft uses system databases to support the SQL Server DBMS, much like a developer uses config files or database tables to support an application. These system databases individually provide specific functionality that allows MS SQL Server to function. Name Database File Log File Master master.mdf mastlog.ldf Resource mssqlsystemresource.mdf mssqlsystemresource.ldf Model model.mdf modellog.ldf MSDB msdbdata.mdf msdblog.ldf Distribution distmdl.mdf distmdl.ldf TempDB tempdb.mdf templog.ldf Master DatabaseIf you have used MS SQL Server then you should recognize the Master database especially if you used the SQL Server Management Studio (SSMS) to connect to a user created database. MS SQL Server requires the Master database in order for DBMS to start due to the information that it stores. Examples of data stored in the Master database User Logins Linked Servers Configuration information Information on User Databases Resource DatabaseHonestly, until recently I never knew this database even existed until I started to research SQL Server system databases. The reason for this is due largely to the fact that the resource database is hidden to users. In fact, the database files are stored within the Binn folder instead of the standard MS SQL Server database folder path. This database contains all system objects that can be accessed by all other databases.  In short, this database contains all system views and store procedures that appear in all other user databases regarding system information. One of the many benefits to storing system views and store procedures in a single hidden database is the fact it improves upgrading a SQL Server database; not to mention that maintenance is decreased since only one code base has to be mainlined for all of the system views and procedures. Model DatabaseThe Model database as the name implies is the model for all new databases created by users. This allows for predefining default database objects for all new databases within a MS SQL Server instance. For example, if every database created by a user needs to have an “Audit” table when it is  created then defining the “Audit” table in the model will guarantees that the table will be located in every new database create after the model is altered. MSDB DatabaseThe MSDBdatabase is used by SQL Server Agent, SQL Server Database Mail, SQL Server Service Broker, along with SQL Server. The SQL Server Agent uses this database to store job configurations and SQL job schedules along with SQL Alerts, and Operators. In addition, this database also stores all SQL job parameters along with each job’s execution history.  Finally, this database is also used to store database backup and maintenance plans as well as details pertaining to SQL Log shipping if it is being used. Distribution DatabaseThe Distribution database is only used during replication and stores meta data and history information pertaining to the act of replication data. Furthermore, when transactional replication is used this database also stores information regarding each transaction. It is important to note that replication is not turned on by default in MS SQL Server and that the distribution database is hidden from SSMS. Tempdb DatabaseThe Tempdb as the name implies is used to store temporary data and data objects. Examples of this include temp tables and temp store procedures. It is important to note that when using this database all data and data objects are cleared from this database when SQL Server restarts. This database is also used by SQL Server when it is performing some internal operations. Typically, SQL Server uses this database for the purpose of large sort and index operations. Finally, this database is used to store row versions if row versioning or snapsot isolation transactions are being used by SQL Server. Additionally, I would love to hear from others about their experiences using system databases, tables, and objects in a real world environments.

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• What is the traditional way to maintain extensibility in a database-driven application like this?

  - by Jsess

  I'm working on a simple application for a game in Java that allows a user to record whether they have collected a given item and how much experience it contains. This will work for multiple item types (weapons, armor) and each will have its own tab with a list of all items that qualify under it. Making changes as new types are added is not such a big deal (if a clothing slot is added, for instance), but new items are added to the game all the time in biweekly patches, and I'm not sure what the traditional/customary way to make sure the application is user-extensible without requiring me to would be. Whether that would be adding a configuration menu that allows users to add news items (new rows to the local SQLite database) or a text file with something similar, but I'm certain there's a well-accepted way to do this that I'm not aware of. I'm new to databases and ignorant of the solution, so what's the professional/futureproof way to do this?

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• How to export a C++ class library to C# using a dll?

  - by SICGames2013

  In my previous revision game engine I deported major functions for the game editor for C#. Now, I'm beginning to revise the game engine with a static library. There's a already dynamic library created in C++ to use DLLEXPORT for C#. Just now I want to test out the newer functions and created a DLL file from C++. Because the DLL contains classes I was wondering how would I be able to use DLL Export. Would I do this: [DLLEXPORT("GameEngine.dll", EntryPoint="SomeClass", Conventional=_stdcall)] static extern void functionFromClass(); I have a feeling it's probably DLLImport and not DLLExport. I was wondering how would I go about this? Another way I was thinking was because I already have the DLL in C++ prepared already to go the C# Class Library. I could just keep the new engine as a lib, and link the lib with the old DLL C++ file. Wouldn't the EntryPoint be able to point to the class the function is in?

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• Scan-Line Z-Buffering Dilemma

  - by Belgin

  I have a set of vertices in 3D space, and for each I retain the following information: Its 3D coordinates (x, y, z). A list of pointers to some of the other vertices with which it's connected by edges. Right now, I'm doing perspective projection with the projecting plane being XY and the eye placed somewhere at (0, 0, d), with d < 0. By doing Z-Buffering, I need to find the depth of the point of a polygon (they're all planar) which corresponds to a certain pixel on the screen so I can hide the surfaces that are not visible. My questions are the following: How do I determine to which polygon does a pixel belong to so I could use the formula of the plane which contains the polygon to find the Z-coordinate? Are my data structures correct? Do I need to store something else entirely in order for this to work? I'm just projecting the vertices onto the projection plane and joining them with lines based on the pointer lists.

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• I've changed my URL schema. How do I tell Google to index the new schema and forget the old one?

  - by growse

  I had a site where the urls were constructed like this /index.php/Topic /index.php/AnotherTopic These were indexed in google, and search results returned that pointed to these. However, I've recently replatformed that site, and reconfigured it so the above urls would be: /index.php?title=Topic /index.php?title=AnotherTopic The original urls are returning 404s. The site is linking to the correct URL schema internally, but Google is retaining the original schema in its search results. I've updated and resubmitted the sitemap which only contains the new schema. Also, Google's webmasters tool is going slightly bananas at the fact there's now a spike in 404 errors in its crawl results. What would be the best approach to get Google to 'forget' about the old schema, and instead index the new schema? Should I try blocking /index.php/ in robots.txt? Should I be returning 301 codes instead of 404 for the original urls?

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• Why are UUID / GUID's in the format they are?

  - by Xeoncross

  Globally Unique Identifiers (GUID) are a grouped string with a specific format which I assume has a security reason. A GUID is most commonly written in text as a sequence of hexadecimal digits separated into five groups, such as: 3F2504E0-4F89-11D3-9A0C-0305E82C3301 Why aren't GUID/UUID strings just random bytes encoded using hexadecimal of X length? This text notation contains the following fields, separated by hyphens: | Hex digits | Description |------------------------- | 8 | Data1 | 4 | Data2 | 4 | Data3 | 4 | Initial two bytes from Data4 | 12 | Remaining six bytes from Data4 There are also several versions of the UUID standards. Version 4 UUIDs are generally internally stored as a raw array of 128 bits, and typically displayed in a format something like: uuid:xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

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• Build & Deployment Guide for Service Bus Relay Project

  - by Michael Stephenson

  Ive recently published a sample guide based on a real-world project where we implemented an on-premise WCF routing solution to connect SAAS applications to our on premise line of business applications. The guide will discuss: How we configured and setup the infrastructure How we setup the on-premise server to listen to the service bus What software we used How we configured Windows Azure This contains some useful contextual information around the reference scenario and hopefull this will be very useful to others undertaking similar projects. Ive also included this on the technet wiki page for Windows Azure Service Bus resources: http://social.technet.microsoft.com/wiki/contents/articles/13825.windows-azure-service-bus-resources.aspx

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• fast java2d translucency

  - by mdriesen

  I'm trying to draw a bunch of translucent circles on a Swing JComponent. This isn't exactly fast, and I was wondering if there is a way to speed it up. My custom JComponent has the following paintComponent method: public void paintComponent(Graphics g) { Rectangle view = g.getClipBounds(); VolatileImage image = createVolatileImage(view.width, view.height); Graphics2D buffer = image.createGraphics(); // translate to camera location buffer.translate(-cx, -cy); // renderables contains all currently visible objects for(Renderable r : renderables) { r.paint(buffer); } g.drawImage(image.getSnapshot(), view.x, view.y, this); } The paint method of my circles is as follows: public void paint(Graphics2D graphics) { graphics.setPaint(paint); graphics.fillOval(x, y, radius, radius); } The paint is just an rgba color with a < 255: Color(int r, int g, int b, int a) It works fast enough for opaque objects, but is there a simple way to speed this up for translucent ones?

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• Trick Ubuntu into resolving a domain name locally

  - by Matthew Brown

  I have an Ubuntu box that I use for all sorts of things. One thing I really want to do is redirect a sub domain to a local script. For example thisbit.example.com should actually show the content from localhost/~USER/FAKE.thisbit.example.com/ which is a folder that Apache is running for me which contains a very simple PHP script which implements an offline version of a server script that I am testing against. But example.com should continue to behave normally as should notthisbit.example.com etc. Ideally I need to be able to switch from testing to live with minimal fuss when the time comes.

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• Amazon Kindle - Whispersync implementation?

  - by Bala

  For those who are not aware of Kindle's whispersync, here is how it works (from amazon.com): "...Whispersync synchronizes the bookmarks and furthest page read among devices registered to the same account. Whispersync is on by default to ensure a seamless reading experience for a book read across multiple Kindles." Can anyone give some details on how the Whispersync feature is implemented in Kindle and in the Backend of Amazon? I am guessing this implementation involves a very simple hashmap for each user account. Each hashmap maps Books with satellite information about the book. Satellite information contains bookmarks, furthest page read, device on which it was read, etc.. Thanks!

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• What library should I use for 2D Geometry? [closed]

  - by Luka

  I've been working on a 2D game in java, but found that java just didn't cut it for me and had forced me to a lot of bad design choices, so I've decided to port all my work to c++. The main reason I've decided change to c++ is that i had reached a point where i had 3 geometry libraries (the native, one from the game engine and one to handle "complex" polygons), none of witch worked very well together and i couldn't keep track of them. I'm new to c++, but i know all the basics. My question is, what would be a good geometry library to use, ideally it should be able to handle integer and decimal data types, have point, line, and polygon classes witch are able to check for intersection and contains. Thanks in advance, Luka

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• What's a good open source cloud computing software? [closed]

  - by boy

  In particular, the "cloud" computing that I'm referring to is: I'm going to get some Linux servers. Then I have pretty big computing tasks to do every day. So my goal is to be able to run some shell command to request an "instance" (ie, if a server has 4 CPU, then the computing software will configure that server to have 4 instances, assuming all my tasks are single thread). Ideally, then I can run the following command: ./addjobs somebatchfile where somebatch file contains one command per line ./removejobs all ./listalljobs (ie, everything is done in shell. And the "computing software" can return me the hostname that's available in some environment variable, etc) And that's all I needed. I run into OpenStack.. but it seems too complicated for this purpose (ie, it does all the Imagine sharing stuff, etc).. All I want, is something SIMPLE that manages the Linux boxes for me and I'm just going to run shell commands on them... Is there such open source software? Thanks,

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• Launchpad fails to build a package for my PPA

  - by AZorin

  I'm trying to build a package on Launchpad's Debian build system for PPAs but I'm having some issues with a certain package. The package I'm trying to build (zorin-xwinwrap) contains a source C file which I'm trying to get to compile and build on Launchpad's server so that it would install and work on 32 bit (i386) and 64 bit (amd64) systems. Unfortunately I keep on getting an Error code 2 with the debian/rules file and I have no clue how to fix this issue. The following link is the source package of the software I'm trying to add to my PPA: http://goo.gl/GjZvd The following link is the buildlog for the failed package on Launchpad: http://goo.gl/6A2rQ I would greatly appreciate any suggestions if anyone may have any. Thank you for your time.

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• Dropdowns revisited

  For my DIBI presentationI need a dropdown menu (in order to compare it on desktop and mobile), so I wrote one.Point is, it took me thirty lines of JavaScript, nine of which only contain a closing },and three of which deal with the fact that bloody Firefox still doesn’t support contains().Net amount of lines: 18. Can somebody please remind me why we all used to think dropdownsare so extremely complicated? I can’t for the life of me figure it out.window.onload = function () { document.getElementById('dropdown').onmouseover...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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• Mobile My Oracle Support 6.3 Release is live!

  - by JanSyss

  We have released Mobile My Oracle Support 6.3 last Saturday (13-Oct-2012), including 10 enhancements and almost 40 bug fixes. Mobile My Oracle Support is My Oracle Support's webapplication optimized for mobile devices to manage your Service Requests, your On Demand Requests for Change (RFCs), search over Support's Knowledge Base, Bug database or Sun System Handbook, and to manage your pending user requests (CUA). You can find the application at http://support.oracle.mobi  or get redirected from http://support.oracle.com when using a mobile device. Overall Several UI optimizations in different screens. Service Request Area Show the platinum icon for Platinum SRs and the restore status for Platinum Sev 1s. Email send with Share functionality now contains links to Mobile MOS and Full Site. Knowledge Management Area Ability in Advanced Search to search the Sun System Handbook (cfr. screenshot below) Better rendering of the KB documents to avoid where possible horizontal scrolling. Don't hesitate to share your feedback and comments or even requests.

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• tty1 prompt before lightdm

  - by David Weldon

  After upgrading to 13.10, every time I boot I'm shown a login prompt (tty1) for ~30 seconds before lightdm automatically starts. Everything works fine after that. Any ideas on what I could try to fix/debug this? My /var/log/lightdm/x-0-greeter.log contains lines like the following: ** (at-spi2-registryd:1381): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files ** (at-spi2-registryd:1381): WARNING **: Unable to register client with session manager WARNING: Failed to open sessions directory: Error opening directory '/usr/share/lightdm/sessions': No such file or directory ** Message: PID 1534 (we are 1534) sent signal 15, shutting down... ** (gnome-settings-daemon:1401): WARNING **: Name taken or bus went away - shutting down Searching for these errors results in a variety of bugs filed over the years. Maybe a clean install will fix this.

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• Control external monitor brightness

  - by remi

  Hello Ubuntu community, I can control the brightness of my DELL U2713HM connected with DisplayPort via the command: ddccontrol -p -r 0x10 -w 53 where in this example the number 53 represents the brightness level (range 0 to 100). But I don't know how to link the command to my brightness keys on my keyboard. I searched already, but just found answers to integrated laptop screens. In /sys/class/backlight is the folder acpi_video0 with some subfolders and files. The file actual_brightness contains a number from 0 to 20, which is changing when I press the brightness keys. How do I get my external monitor listed as a device in /sys/class/backlight ? PS: I am running a fresh Ubuntu 12.10 install with integrated graphics Intel HD4000.

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• Term for Production Rollback

  - by trainer

  The firm I work at keeps a copy of the compiled source code on production. So basically on our Production server, we have two folders: ProductionServer\SourceCode\ ProductionServer\SourceCodeRollback\ The Rollback folder always contains one version older code. This is done so that on deployment nights, if something is wrong with the new code, the deployer(who is not familiar with source control software) has the older version to revert back to. My question is: Is there an official computer science term/nomenclature for the Rollback folder? Or is "Rollback" itself the official term?

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• why is it a risk to clone a LUKS container?

  - by laramichaels

  I recently installed Ubuntu onto an encrypted partition using the LUKS+LVM combination that the 'alternate' installer offers. Now I want to create backups of my HD. From the LUKS FAQ: 6.15 Can I clone a LUKS container? You can, but it breaks security, because the cloned container has the same header and hence the same master key. You cannot change the master key on a LUKS container, even if you change the passphrase(s), the master key stays the same. That means whoever has access to one of the clones can decrypt them all, completely bypassing the passphrases. How can the existence of a perfect clone of my encrypted HD break security if it contains the exact same information as my live encrypted HD? In which sense does keeping updated clones of my LUKS-encrypted HD around "break security"?

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• Latest Exadata Quarterly Full Stack Patch

  - by Bethany Lapaglia

  The latest Quarterly Full Stack patch was released on October 17th for Exadata.  This patch contains all of the latest recommended patches for the Exadata Database Machine.  For more details, refer to My Oracle Support Note titled Database Machine and Exadata Storage Server 11g Release 2 (11.2) Supported Versions [888828.1].  Note that the information in the note applies only to Exadata Storage Server Software 11.2.  This note is maintained on a regular basis so bookmark it and use it as reference for the latest Exadata Database Machine patching recommendations.

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• My coworker created a 96 columns SQL table

  - by Eric

  Here we are in 2010, software engineers with 4 or 5 years or experience, still designing tables with 96 fracking columns. I told him it's gonna be a nightmare. I showed him that we have to use ordinals to interface MySQL with C#. I explained that tables with more columns than rows are a huge smell. Still, I get the "It's going to be simpler this way". What should I do? EDIT * This table contains data from sensors. We have sensor 1 with Dynamic_D1X Dynamic_D1Y [...] Dynamic_D6X Dynamic_D6Y [...]

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• Removing surrounding noises from voice recording

  - by Peak Reconstruction Wavelength

  I have a wave file whose frequency spectrum looks like this. http://i.stack.imgur.com/2rRaS.png It contains audio, which I want to keep while removing the rest. The problem is that the surround noise changes, just those distinct voice patterns remain. I marked the voice patterns for clarity: http://i.stack.imgur.com/eLkBl.png What could an algorithm look like / a workflow in adobe audition look like that removes everything but the voice patterns? I think that the main characteristic is the line-shaped form over time. Loudness alone is not enough as the noise is loud aswell.

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• Is it really a security problem to have non secure assets on an ssl page?

  - by blockhead

  My understanding is that this is just an example of being overly cautious, but if my checkout form contains an unsecure asset on it, that doesn't endanger anybody's credit card numbers from being caught by a man-in-the-middle. I'm asking this because every once in while, maybe because of cached content or whatnot, somebody writes in saying that they are seeing this "error" (even though there are no unsecure assets on my page), but they want an explanation. So yes, I can tell all about encryption and certificates and trust and men-in-the-middle. But what do I tell them about this. How do I convince them that the site is 100% safe (and if it isn't let me know that I'm mistaken!)

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• How should I model an economy-based game in code?

  - by Matthew G.

  I'd like to create an economy game based on an ancient civilization. I'm not sure how to design it. If I were working on a smaller game, like a copy of "Space Invaders," I'd have no problem structuring it like this: Main Control Class Graphics Class Player Class Enemy class I don't understand how I'd do this for larger projects like my economy game. Do I create a country class that contains a bunch of towns? Do the towns contain a lot building class, most contain classes of people? Do I make a path finding class that the player can access to get around?

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• Useful design patterns for working with FragmentManager on Android

  - by antman8969

  When working with fragments, I have been using a class composed of static methods that define actions on fragments. For any given project, I might have a class called FragmentActions, which contains methods similar to the following: public static void showDeviceFragment(FragmentManager man){ String tag = AllDevicesFragment.getFragmentTag(); AllDevicesFragment fragment = (AllDevicesFragment)man.findFragmentByTag(tag); if(fragment == null){ fragment = new AllDevicesFragment(); } FragmentTransaction t = man.beginTransaction(); t.add(R.id.main_frame, fragment, tag); t.commit(); } I'll usually have one method per application screen. I do something like this when I work with small local databases (usually SQLite) so I applied it to fragments, which seem to have a similar workflow; I'm not married to it though. How have you organized your applications to interface with the Fragments API, and what (if any) design patterns do you think apply do this?

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