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• SQL SERVER – Sharing your ETL Resources Across Applications with Ease

  - by pinaldave

  Frequently an organization will find that the same resources are used in multiple ETL applications, for example, the same database, general purpose processing logic, or file system locations.  Creating an easy way to reuse these resources across multiple applications would increase efficiency and reduce errors.  Moreover, not every ETL developer has the same skill set, and it is likely that one developer will be more adept at writing code while another is more comfortable configuring database connections.  Real productivity gains will come when these developers are able to work independently while still making their work available to others assigned to the same project.  These are the benefits of a centralized version control system. Of course, most version control systems could be used to store and serve files, but the real need is to store and serve entire ETL applications so that each developer’s ongoing work can immediately benefit from another developer’s completed work.  In other words, the version control system needs to be tightly integrated with the tools used to develop the ETL application. The following screen shot shows such a tool. Desktop ETL tool that tightly integrates with a central version control system Developers can checkout or commit entire projects or just a single artifact.  Each artifact may be managed independently so if you need to go back to an earlier version of one artifact, changes you may have made to other artifacts are not lost.  By being tightly integrated into the graphical environment used to create and edit the project artifacts, it is extremely easy and straight-forward to move your files to and from the version control system and there is no dependency on another vendor’s version control system.  The built in version control system is optimized for managing the artifacts of ETL applications. It is equally important that the version control system supports all of the actions one typically performs such as rollbacks, locking and unlocking of files, and the ability to resolve conflicts.  Note that this particular ETL tool also has the capability to switch back and forth between multiple version control systems. It also needs to be easy to determine the status of an artifact.  Not just that it has been committed or modified, but when and by whom.  Generally you must query the version control system for this information, but having it displayed within the development environment is more desirable. Who’s ETL tool works in this fashion?  Last month I mentioned the data integration solution offered by expressor software.  The version control features I described in this post are all available in their just released expressor 3.1 Standard Edition through the integration of their expressor Studio development environment with a centralized metadata repository and version control system. You can download their Studio application, which is free, or evaluate the full Standard Edition on your own hardware.  It may be worth your time. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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• Fluid VS Responsive Website Development Questions

  - by Aditya P

  As I understand these form the basis for targeting a wide array of devices based on the browser size, given it would be a time consuming to generate different layouts targeting different/specific devices and their resolutions. Questions: Firstly right to the jargon, is there any actual difference between the two or do they mean the same? Is it safe to classify the current development mainly a html5/css3 based one? What popular frameworks are available to easily implement this? What testing methods used in this regard? What are the most common compatibility issues in terms of different browser types? I understand there are methods like this http://css-tricks.com/resolution-specific-stylesheets/ which does this come under?. Are there any external browser detection methods besides the API calls specific to the browser that are employed in this regard? Points of interest [Prior Research before asking these questions] Why shouldn't "responsive" web design be a consideration? Responsive Web Design Tips, Best Practices and Dynamic Image Scaling Techniques A recent list of tutorials 30 Responsive Web Design and Development Tutorials by Eric Shafer on May 14, 2012 Update Ive been reading that the basic point of designing content for different layouts to facilitate a responsive web design is to present the most relevant information. now obviously between the smallest screen width and the highest we are missing out on design elements. I gather from here http://flashsolver.com/2012/03/24/5-top-commercial-responsive-web-designs/ The top of the line design layouts (widths) are desktop layout (980px) tablet layout (768px) smartphone layout – landscape (480px) smartphone layout – portrait (320px) Also we have a popular responsive website testing site http://resizemybrowser.com/ which lists different screen resolutions. I've also come across this while trying to find out the optimal highest layout size to account for http://stackoverflow.com/questions/10538599/default-web-page-width-1024px-or-980px which brings to light seemingly that 1366x768 is a popular web resolution. Is it safe to assume that just accounting for proper scaling from width 980px onwards to the maximum size would be sufficient to accommodate this? given we aren't presenting any new information for the new size. Does it make sense to have additional information ( which conflicts with purpose of responsive web design) to utilize the top size and beyond?

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• Keyboard Shortcuts in Oracle SQL Developer

  - by thatjeffsmith

  The CTRL key, which stands for ConTRoL…aw, the good ole days What keyboard shortcuts should EVERY Oracle SQL Developer user know? How do you find new shortcuts to master, and how do you change them to match ones you’ve already learned in other tools? These are the driving questions for today’s post. While some of us may be keyboard ninjas, and others are more driven to use the mouse – everyone has probably picked up a few strategic keyboard shortcuts over the years. For example, I’ve personally JUST memorized the Cmd-Shift-4 ‘trick’ in Mac OS X. And of course we all know what F1 does, right? Right?!? Here are a few more keyboard shortcuts to commit to memory. My Favorite SQL Developer Shortcuts ctrl-enter : executes the current statement(s) F5 : executes the current code as a script (think SQL*Plus) ctrl-space : invokes code insight on demand Code Editor – Completion Insight – Enable Completion Auto-Popup (Keyword being Auto) ctrl-Up/Dn : replaces worksheet with previous/next SQL from SQL History ctrl-shift+Up/Dn : same as above but appends instead of replaces shift+F4 : opens a Describe window for current object at cursor ctrl+F7 : format SQL ctrl+/ : toggles line commenting ctrl+e : incremental search Configuring Keyboard Shortcuts in SQL Developer Tools Preferences Shortcut Keys Search by command name OR the keystroke itself Some tips… Sort by category Pay special attention to the ‘Code Editor’ and ‘Other’ categories Mind the conflicts when you change the defaults Be nice – share! You can save your new mappings with your co-workers using the Export and Import buttons Click on ‘More Actions’ to expose the Import and Export buttons When I get ‘bored’ or if I think I might be missing something, I peruse the Code Editor and Other categories, again! I’ve picked up quite a few cool editor tricks here. Then I blog about them, like they’re ‘magic.’ #EvilLaugh But the main tip is this – don’t let your previously memorized keyboard shortcuts SHORTCUT your usage of SQL Developer. If your fingers have already memorized some keystrokes, just re-program SQL Developer to match! What’s your favorite shortcut? I’ll use the most popular shortcut mentioned in the comments to round out my Top 10 list above!

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• How to wire finite state machine into component-based architecture?

  - by Pup

  State machines seem to cause harmful dependencies in component-based architectures. How, specifically, is communication handled between a state machine and the components that carry out state-related behavior? Where I'm at: I'm new to component-based architectures. I'm making a fighting game, although I don't think that should matter. I envision my state machine being used to toggle states like "crouching", "dashing", "blocking", etc. I've found this state-management technique to be the most natural system for a component-based architecture, but it conflicts with techniques I've read about: Dynamic Game Object Component System for Mutable Behavior Characters It suggests that all components activate/deactivate themselves by continually checking a condition for activation. I think that actions like "running" or "walking" make sense as states, which is in disagreement with the accepted response here: finite state machine used in mario like platform game I've found this useful, but ambiguous: How to implement behavior in a component-based game architecture? It suggests having a separate component that contains nothing but a state machine. But, this necessitates some kind of coupling between the state machine component and nearly all the other components. I don't understand how this coupling should be handled. These are some guesses: A. Components depend on state machine: Components receive reference to state machine component's getState(), which returns an enumeration constant. Components update themselves regularly and check this as needed. B. State machine depends on components: The state machine component receives references to all the components it's monitoring. It queries their getState() methods to see where they're at. C. Some abstraction between them Use an event hub? Command pattern? D. Separate state objects that reference components State Pattern is used. Separate state objects are created, which activate/deactivate a set of components. State machine switches between state objects. I'm looking at components as implementations of aspects. They do everything that's needed internally to make that aspect happen. It seems like components should function on their own, without relying on other components. I know some dependencies are necessary, but state machines seem to want to control all of my components.

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• Handling Coding Standards at Work (I'm not the boss)

  - by Josh Johnson

  I work on a small team, around 10 devs. We have no coding standards at all. There are certain things that have become the norm but some ways of doing things are completely disparate. My big one is indentation. Some use tabs, some use spaces, some use a different number of spaces, which creates a huge problem. I often end up with conflicts when I merge because someone used their IDE to auto format and they use a different character to indent than I do. I don't care which we use I just want us all to use the same one. Or else I'll open a file and some lines have curly brackets on the same line as the condition while others have them on the next line. Again, I don't mind which one so long as they are all the same. I've brought up the issue of standards to my direct manager, one on one and in group meetings, and he is not overly concerned about it (there are several others who share the same view as myself). I brought up my specific concern about indentation characters and he thought a better solution would be to, "create some kind of script that could convert all that when we push/pull from the repo." I suspect that he doesn't want to change and this solution seems overly complicated and prone to maintenance issues down the road (also, this addresses only one manifestation of a larger issue). Have any of you run into a similar situation at work? If so, how did you handle it? What would be some good points to help sell my boss on standards? Would starting a grass roots movement to create coding standards, among those of us who are interested, be a good idea? Am I being too particular, should I just let it go? Thank you all for your time. Note: Thanks everyone for the great feedback so far! To be clear, I don't want to dictate One Style To Rule Them All. I'm willing to concede my preferred way of doing something in favor of what suits everyone the best. I want consistency and I want this to be a democracy. I want it to be a group decision that everyone agrees on. True, not everyone will get their way, but I'm hoping that everyone will be mature enough to compromise for the betterment of the group. Note 2: Some people are getting caught up in the two examples I gave above. I'm more after the heart of the matter. It manifests itself with many examples: naming conventions, huge functions that should be broken up, should something go in a util or service, should something be a constant or injected, should we all use different versions of a dependency or the same, should an interface be used for this case, how should unit tests be set up, what should be unit tested, (Java specific) should we use annotations or external config. I could go on.

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• Manage and Monitor Identity Ranges in SQL Server Transactional Replication

  - by Yaniv Etrogi

  Problem When using transactional replication to replicate data in a one way topology from a publisher to a read-only subscriber(s) there is no need to manage identity ranges. However, when using  transactional replication to replicate data in a two way replication topology - between two or more servers there is a need to manage identity ranges in order to prevent a situation where an INSERT commands fails on a PRIMARY KEY violation error  due to the replicated row being inserted having a value for the identity column which already exists at the destination database. Solution There are two ways to address this situation: Assign a range of identity values per each server. Work with parallel identity values. The first method requires some maintenance while the second method does not and so the scripts provided with this article are very useful for anyone using the first method. I will explore this in more detail later in the article. In the first solution set server1 to work in the range of 1 to 1,000,000,000 and server2 to work in the range of 1,000,000,001 to 2,000,000,000.  The ranges are set and defined using the DBCC CHECKIDENT command and when the ranges in this example are well maintained you meet the goal of preventing the INSERT commands to fall due to a PRIMARY KEY violation. The first insert at server1 will get the identity value of 1, the second insert will get the value of 2 and so on while on server2 the first insert will get the identity value of 1000000001, the second insert 1000000002 and so on thus avoiding a conflict. Be aware that when a row is inserted the identity value (seed) is generated as part of the insert command at each server and the inserted row is replicated. The replicated row includes the identity column’s value so the data remains consistent across all servers but you will be able to tell on what server the original insert took place due the range that  the identity value belongs to. In the second solution you do not manage ranges but enforce a situation in which identity values can never get overlapped by setting the first identity value (seed) and the increment property one time only during the CREATE TABLE command of each table. So a table on server1 looks like this: CREATE TABLE T1 (  c1 int NOT NULL IDENTITY(1, 5) PRIMARY KEY CLUSTERED ,c2 int NOT NULL ); And a table on server2 looks like this: CREATE TABLE T1(  c1 int NOT NULL IDENTITY(2, 5) PRIMARY KEY CLUSTERED ,c2 int NOT NULL ); When these two tables are inserted the results of the identity values look like this: Server1:  1, 6, 11, 16, 21, 26… Server2:  2, 7, 12, 17, 22, 27… This assures no identity values conflicts while leaving a room for 3 additional servers to participate in this same environment. You can go up to 9 servers using this method by setting an increment value of 9 instead of 5 as I used in this example. Continues…

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• Why does aptitude want to remove a bunch of files?

  - by Mediterran81

  Recently I encountered dependencies resolve issues when using APTITUDE (it is my favorite). Nevertheless, I started to feel that APTITUDE does not behave as it is supposed to be in 64 bits systems while apt-get works fine. Can someone confirm that APTITUDE is buggy in Ubuntu 11.10 amd64? Edit: For example, when tried to install ntfs-config using APTITUDE, it asked me to remove over 100 packages (skype for example), while using apt-get worked fine. han@L502X:~$ sudo aptitude install ntfs-config [sudo] password for han: The following NEW packages will be installed: ntfs-3g{ab} ntfs-config 0 packages upgraded, 2 newly installed, 0 to remove and 0 not upgraded. Need to get 0 B/640 kB of archives. After unpacking 2,466 kB will be used. The following packages have unmet dependencies: ntfs-3g: Conflicts: ntfsprogs but 2.0.0-1ubuntu4 is installed. The following actions will resolve these dependencies: Remove the following packages: 1) flashplugin-downloader 2) flashplugin-installer 3) libasound2 4) libasound2-plugins 5) libasyncns0 6) libatk1.0-0 7) libaudio2 8) libavahi-client3 9) libavahi-common3 10) libc6 11) libcairo2 12) libcomerr2 13) libcups2 14) libcurl3 15) libdatrie1 16) libdb5.1 17) libdbus-1-3 18) libdbusmenu-qt2 19) libexpat1 20) libffi6 21) libflac8 22) libfontconfig1 23) libfreetype6 24) libgcc1 25) libgcrypt11 26) libgdk-pixbuf2.0-0 27) libglib2.0-0 28) libgnutls26 29) libgpg-error0 30) libgssapi-krb5-2 31) libgtk2.0-0 32) libice6 33) libidn11 34) libjack-jackd2-0 35) libjasper1 36) libjpeg62 37) libjson0 38) libk5crypto3 39) libkeyutils1 40) libkrb5-3 41) libkrb5support0 42) liblcms1 43) libldap-2.4-2 44) libmng1 45) libnspr4 46) libnspr4-0d 47) libnss3 48) libnss3-1d 49) libogg0 50) libpango1.0-0 51) libpcre3 52) libpixman-1-0 53) libpng12-0 54) libpulse0 55) libqt4-dbus 56) libqt4-declarative 57) libqt4-network 58) libqt4-script 59) libqt4-sql 60) libqt4-xml 61) libqt4-xmlpatterns 62) libqtcore4 63) libqtgui4 64) librtmp0 65) libsamplerate0 66) libsasl2-2 67) libsasl2-modules 68) libselinux1 69) libsm6 70) libsndfile1 71) libspeexdsp1 72) libsqlite3-0 73) libssl1.0.0 74) libstdc++6 75) libtasn1-3 76) libthai0 77) libtiff4 78) libuuid1 79) libvorbis0a 80) libvorbisenc2 81) libwrap0 82) libx11-6 83) libxau6 84) libxcb-render0 85) libxcb-shm0 86) libxcb1 87) libxcomposite1 88) libxcursor1 89) libxdamage1 90) libxdmcp6 91) libxext6 92) libxfixes3 93) libxft2 94) libxi6 95) libxinerama1 96) libxrandr2 97) libxrender1 98) libxss1 99) libxt6 100) libxv1 101) nspluginviewer 102) nspluginwrapper 103) ntfsprogs 104) skype 105) sni-qt 106) zlib1g Leave the following dependencies unresolved: 107) flashplugin-downloader recommends libasound2-plugins (>= 1.0.16) Accept this solution? [Y/n/q/?]

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• Design pattern for an ASP.NET project using Entity Framework

  - by MPelletier

  I'm building a website in ASP.NET (Web Forms) on top of an engine with business rules (which basically resides in a separate DLL), connected to a database mapped with Entity Framework (in a 3rd, separate project). I designed the Engine first, which has an Entity Framework context, and then went on to work on the website, which presents various reports. I believe I made a terrible design mistake in that the website has its own context (which sounded normal at first). I present this mockup of the engine and a report page's code behind: Engine (in separate DLL): public Engine { DatabaseEntities _engineContext; public Engine() { // Connection string and procedure managed in DB layer _engineContext = DatabaseEntities.Connect(); } public ChangeSomeEntity(SomeEntity someEntity, int newValue) { //Suppose there's some validation too, non trivial stuff SomeEntity.Value = newValue; _engineContext.SaveChanges(); } } And report: public partial class MyReport : Page { Engine _engine; DatabaseEntities _webpageContext; public MyReport() { _engine = new Engine(); _databaseContext = DatabaseEntities.Connect(); } public void ChangeSomeEntityButton_Clicked(object sender, EventArgs e) { SomeEntity someEntity; //Wrong way: //Get the entity from the webpage context someEntity = _webpageContext.SomeEntities.Single(s => s.Id == SomeEntityId); //Send the entity from _webpageContext to the engine _engine.ChangeSomeEntity(someEntity, SomeEntityNewValue); // <- oops, conflict of context //Right(?) way: //Get the entity from the engine context someEntity = _engine.GetSomeEntity(SomeEntityId); //undefined above //Send the entity from the engine's context to the engine _engine.ChangeSomeEntity(someEntity, SomeEntityNewValue); // <- oops, conflict of context } } Because the webpage has its own context, giving the Engine an entity from a different context will cause an error. I happen to know not to do that, to only give the Engine entities from its own context. But this is a very error-prone design. I see the error of my ways now. I just don't know the right path. I'm considering: Creating the connection in the Engine and passing it off to the webpage. Always instantiate an Engine, make its context accessible from a property, sharing it. Possible problems: other conflicts? Slow? Concurrency issues if I want to expand to AJAX? Creating the connection from the webpage and passing it off to the Engine (I believe that's dependency injection?) Only talking through ID's. Creates redundancy, not always practical, sounds archaic. But at the same time, I already recuperate stuff from the page as ID's that I need to fetch anyways. What would be best compromise here for safety, ease-of-use and understanding, stability, and speed?

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• My program at #MIX10

  - by Laurent Bugnion

  Getting ready to fly to Vegas and MIX10 is really an exciting time! It is also a very busy time, because we are working on a few projects that will be shown on stage, I have my presentation to prepare, and of course as always the book… though these days it has been a bit on the back burner to be honest ;) I arrive in Vegas on Sunday evening around 10PM, so I won’t be able to make it to the traditional IdentityMine dinner this year. I am sure it will be fun nonetheless! My session: Understanding the MVVM pattern http://live.visitmix.com/MIX10/Sessions/EX14 My session is scheduled on the first day, which is awesome, so I am crossing my fingers and hoping that the MIX team doesn’t change it at the last minute… The session will take place on Monday, the 15th of March, 2PM, Room Lagoon F Important: remember that the USA are moving to Summer time on Sunday, so don’t forget to adjust your watches!! Ask the Experts On Monday evening, I will attend the Ask the Experts event, which is taking place between 5Pm and 6:30PM in the main meal hall. This will be a great occasion to grab a beer and talk about code. The Commons MIX has a great place called the Commons, a great location to chill between sessions, and meet tons of interesting people. I love the Commons and plan to spend a lot of time there to meet as many people as I can. Parties I was invited to a few parties, and will do my best to avoid conflicts :) I plan to be at the following events: Silverlight Mixers on Monday evening Insiders MIX party on Tuesday Silverlight partner happy hour on Tuesday too This is a lot of fun, but at the same time we all know that the best value of a conference is to meet people face to face. This is just the right occasion.  And on Thursday… On Thursday I will be attending a Silverlight event at the Luxor. It will be a very busy day, perfect way to end the conference. I fly back home on Friday morning, but due to a long stop in Washington DC (where I intend to go downtown and take pictures… except if the weather is bad, in which case I will probably go to the museum of flight), I will reach home only on Sunday. Getting hold of me The best way to reach me during MIX is to send me a message on Twitter. I will regularly tweet my location at the conference, so make sure to come and meet me. I am eager to make new friends, to talk about the fantastic jobs we did in WPF and Silverlight over the past year and hear your war stories! http://www.twitter.com/lbugnion   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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• Shelving &ndash; What is it &ndash; and more importantly, can it help me?

  - by Chris Skardon

  Since we shifted to TFS we’ve had the ability to perform what is known as ‘shelving’. Shelving (whilst not a wholly new topic in the world of SCC) is new to us, and didn’t exist in our previous SCC solution – SVN. Soo… what is it? What? Shelving is a way to check-in but not check-in your code. By shelving you submit a copy of your ‘pending changes’ to the SCC server, (which maintains a list of the shelvesets) and once that is done you can either continue working, or undo your changes, safe in the knowledge that a backup copy exists on the server. You can unshelve your code at any time and get back to the state you were when you shelved. Yer, that is great but why not just check it in?? Shelvesets don’t have to build. The shelveset you put in there could be entirely broken, or it might solve every bug in the system – shelves aren’t continuously integrated so you can shelve anything. Hmmmm… What else? Shelving allows us to do some pretty cool stuff that beforehand was quite frankly a pain. For instance – Gated Check-ins are implemented via the shelving mechanism, when code is checked-in, what you’re actually doing is shelving it, the Build Controller will build the shelveset with the original code and if it succeeds, the code will be committed, if it fails – well – it’s only you that has to fix the code :) Other nice features are things like the ability to share code you are working on… For example, if I was having trouble with a particular piece of code, I could shelve it, and then you (yes you) could then get that shelveset and check out the problem for yourself, and if you fix it?? Well – you could check-it in! Nice, but day-to-day shizzle? Let’s say you’ve been working on your project and your project manager comes over to you and says: “Hey, errr, bad times, there is an urgent bug we need you to fix, it needs to go out now!” (also for this to play out – we’ll need to assume you’re currently working in the 'release’ branch for another bug fix (maybe))… You could undo all your current changes (obviously you’ll probably backup your code using zip or something I imagine) fix the bug, then re-copy your backup over the top, or you could shelve and unshelve. Perhaps some other uses will awaken the shelver in you… :) Before each checkin – if you shelve, you no longer need to worry (if indeed you do) about resolving conflicts and mysteriously losing your code… Going home at night? Not checking in straight away? Why not shelve, this way – should the worst come to the worst and your local pc gives up, you can just get the shelveset onto another machine and be up and running in literally seconds minutes…

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• How to use TFS as a query tracking system?

  - by deostroll

  We already use tfs for managing defects in code etc, etc. We additionally need a way to "understand the domain & requirements of the products". Normally, without tfs we exchange emails with the consultants and have the questions/queries answered. If it is a feature implementation we sometimes "find" conflicts in the implementation itself. And when that happens the userstory is modified and the enhancement/bug as per that is raised in TFS. Sometimes it is critical we come back to decisions we made or questions we wanted answers to. Hence we need to be able to track how that "requirement idea" or that "query in concern" evolved. Hence how is it that we can use TFS to track all of this? Do we raise an "issue" item for this? Or do we raise a "bug" item? The main things we'd ideally look in a query tracking system are as follows: Area: Can be a module, submodule, domain. Sometimes this may be "General" - to address domain related stuff, or, event more granular to address modules, sub-modules. Take the case for the latter, if we were tracking this in excel sheets, we'd just write module1,submodule2; i.e. in a comma separated fashion. The things I would like here is to be able search for all queries relating to submodule2 sometime in the future. Responses: This is a record of conversations between the consultant and any other stakeholder. For a simple case, it would just be paragraphs. Each para would start with a name and date enclosed in brackets and the response following that...each para would be like a thread - much like a forum thread Action taken: We'd want to know how the query was closed, what was the input given, what were the changes that took place because of that, etc etc. These are fields I think I would need in such a system apart from some obvious ones like status, address to, resovled by, etc. I am open for any other fields which are sort of important. To summarise my question: how can we manage "queries" in the system? Where should we ideally store data pertaining to those three fields I have mentioned above (for e.g. is it wise to store responses in the history tag assuming we are opening a bug for the query)?

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• How granular should a command be in a CQ[R]S model?

  - by Aaronaught

  I'm considering a project to migrate part of our WCF-based SOA over to a service bus model (probably nServiceBus) and using some basic pub-sub to achieve Command-Query Separation. I'm not new to SOA, or even to service bus models, but I confess that until recently my concept of "separation" was limited to run-of-the-mill database mirroring and replication. Still, I'm attracted to the idea because it seems to provide all the benefits of an eventually-consistent system while sidestepping many of the obvious drawbacks (most notably the lack of proper transactional support). I've read a lot on the subject from Udi Dahan who is basically the guru on ESB architectures (at least in the Microsoft world), but one thing he says really puzzles me: As we get larger entities with more fields on them, we also get more actors working with those same entities, and the higher the likelihood that something will touch some attribute of them at any given time, increasing the number of concurrency conflicts. [...] A core element of CQRS is rethinking the design of the user interface to enable us to capture our users’ intent such that making a customer preferred is a different unit of work for the user than indicating that the customer has moved or that they’ve gotten married. Using an Excel-like UI for data changes doesn’t capture intent, as we saw above. -- Udi Dahan, Clarified CQRS From the perspective described in the quotation, it's hard to argue with that logic. But it seems to go against the grain with respect to SOAs. An SOA (and really services in general) are supposed to deal with coarse-grained messages so as to minimize network chatter - among many other benefits. I realize that network chatter is less of an issue when you've got highly-distributed systems with good message queuing and none of the baggage of RPC, but it doesn't seem wise to dismiss the issue entirely. Udi almost seems to be saying that every attribute change (i.e. field update) ought to be its own command, which is hard to imagine in the context of one user potentially updating hundreds or thousands of combined entities and attributes as it often is with a traditional web service. One batch update in SQL Server may take a fraction of a second given a good highly-parameterized query, table-valued parameter or bulk insert to a staging table; processing all of these updates one at a time is slow, slow, slow, and OLTP database hardware is the most expensive of all to scale up/out. Is there some way to reconcile these competing concerns? Am I thinking about it the wrong way? Does this problem have a well-known solution in the CQS/ESB world? If not, then how does one decide what the "right level" of granularity in a Command should be? Is there some "standard" one can use as a starting point - sort of like 3NF in databases - and only deviate when careful profiling suggests a potentially significant performance benefit? Or is this possibly one of those things that, despite several strong opinions being expressed by various experts, is really just a matter of opinion?

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• How can you tell whether to use Composite Pattern or a Tree Structure, or a third implementation?

  - by Aske B.

  I have two client types, an "Observer"-type and a "Subject"-type. They're both associated with a hierarchy of groups. The Observer will receive (calendar) data from the groups it is associated with throughout the different hierarchies. This data is calculated by combining data from 'parent' groups of the group trying to collect data (each group can have only one parent). The Subject will be able to create the data (that the Observers will receive) in the groups they're associated with. When data is created in a group, all 'children' of the group will have the data as well, and they will be able to make their own version of a specific area of the data, but still linked to the original data created (in my specific implementation, the original data will contain time-period(s) and headline, while the subgroups specify the rest of the data for the receivers directly linked to their respective groups). However, when the Subject creates data, it has to check if all affected Observers have any data that conflicts with this, which means a huge recursive function, as far as I can understand. So I think this can be summed up to the fact that I need to be able to have a hierarchy that you can go up and down in, and some places be able to treat them as a whole (recursion, basically). Also, I'm not just aiming at a solution that works. I'm hoping to find a solution that is relatively easy to understand (architecture-wise at least) and also flexible enough to be able to easily receive additional functionality in the future. Is there a design pattern, or a good practice to go by, to solve this problem or similar hierarchy problems? EDIT: Here's the design I have: The "Phoenix"-class is named that way because I didn't think of an appropriate name yet. But besides this I need to be able to hide specific activities for specific observers, even though they are attached to them through the groups. A little Off-topic: Personally, I feel that I should be able to chop this problem down to smaller problems, but it escapes me how. I think it's because it involves multiple recursive functionalities that aren't associated with each other and different client types that needs to get information in different ways. I can't really wrap my head around it. If anyone can guide me in a direction of how to become better at encapsulating hierarchy problems, I'd be very glad to receive that as well.

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• OpenSolaris / Nexenta problems with NetXen 4-port NIC card (ntxn driver)

  - by ewwhite

  Hello, I'm running NexentaStor Enterprise on an HP ProLiant DL180 G6 server. The onboard NIC interfaces surface as igb0 and igb1 and work well. However, I've added an HP NC375T 4-port network card using the NetXen 3031 chipset. This card should be handled by the ntxn driver in the SUNWntxn package, but that results in "ntxn0: failed to map doorbell" messages upon boot. The network interfaces don't show up. After some research, I found HP's driver package for the card. The release notes for the driver package state: This version of the Driver is supported only on Oracle Solaris 10 5/09 & 10/09. Oracle Solaris 10 5/09 & 10/09 contain an older version of NetXen P3 driver package called SUNWntxn. So, adding another version of NetXen P3 driver package using pkgadd command might result in conflicts with the NetXen driver binary & related files. Users are advised to uninstall native SUNWntxn driver package before installing the new package. The install completes, but I end up with a different set of errors in initializing the card. ifconfig ntxn0 plumb ifconfig: cannot open link "ntxn0": DLPI link does not exist dmesg output: Jan 29 07:20:17 ch-san2 ntxn: [ID 977263 kern.warning] WARNING: Memory not available Jan 29 07:20:17 ch-san2 ntxn: [ID 404858 kern.notice] NOTICE: ntxn0: Mac registration error Trying to manually create the device files: root@ch-san2:/volumes# add_drv -i "4040,100" ntxn ("ntxn") already in use as a driver or alias. Update the driver: root@ch-san2:/volumes# update_drv -f ntxn devfsadm: driver failed to attach: ntxn Warning: Driver (ntxn) successfully added to system but failed to attach Any ideas on how to get this driver working, or should I ditch the card and go with an Intel or something else?

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• rpm file conflict after alien conversion

  - by Zitrax

  I have a program for which I generate a .deb file. The .deb file works fine on the systems I have tried it on (also tested with lintian). Previously it has worked to use alien to convert this to .rpm and install it on Suse. However it is now about a year since I tried it the last time and now I get an error when trying to install the alien made rpm on Fedora 11, I get this error: file /usr/share/icons/default.kde from install of testpkg-0.2-2.i386 conflicts with file from package kdelibs3-3.5.10-13.fc11.1.i586 Listing the content of the rpm file: $ rpm -qlp testpkg-0.2-2.i386.rpm / /usr /usr/games /usr/games/testpkg /usr/lib /usr/lib/libfmod-3.75.so /usr/share /usr/share/app-install /usr/share/app-install/icons /usr/share/app-install/icons/testpkg.png /usr/share/applications /usr/share/applications/testpkg.desktop /usr/share/doc /usr/share/doc/testpkg /usr/share/doc/testpkg/changelog.gz /usr/share/doc/testpkg/copyright /usr/share/games /usr/share/games/testpkg /usr/share/games/testpkg/images /usr/share/games/testpkg/images/bb.dat /usr/share/games/testpkg/images/bb_bg.dat /usr/share/games/testpkg/images/bubblemad_8x8.png /usr/share/games/testpkg/images/goldfont.png /usr/share/games/testpkg/lvl /usr/share/games/testpkg/lvl/lvl001.txt /usr/share/games/testpkg/lvl/lvl002.txt /usr/share/games/testpkg/lvl/lvl003.txt /usr/share/games/testpkg/lvl/lvl004.txt /usr/share/games/testpkg/lvl/lvl005.txt /usr/share/games/testpkg/lvl/lvl006.txt /usr/share/games/testpkg/lvl/lvl007.txt /usr/share/games/testpkg/music /usr/share/games/testpkg/music/alfa.it /usr/share/games/testpkg/music/beta.it /usr/share/games/testpkg/sounds /usr/share/games/testpkg/sounds/bounce.wav /usr/share/games/testpkg/sounds/click.wav /usr/share/games/testpkg/sounds/warning.wav /usr/share/icons /usr/share/icons/default.kde /usr/share/icons/default.kde/16x16 /usr/share/icons/default.kde/16x16/apps /usr/share/icons/default.kde/16x16/apps/testpkg.png /usr/share/man /usr/share/man/man6 /usr/share/man/man6/testpkg.6.gz Am I wrong in putting the kde icons in /usr/share/icons/default.kde which seem to be a symbolic link ? It's a symbolic link on both Kubuntu 9.10 and Fedora 11 though. Sounds like a common situation that the same directory is needed for different packages, so why is it a conflict ?

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• Sync OneNote Notebooks to/on SkyDrive

  - by Sam

  I've got OneNote running on all computers in our house, using it all the time with several people and computers. The only drawback: I want to keep the copies of OneNote in sync without having to run a dedicated server myself. Right now one of my computers has a folder share, where all others sync to, but this is highly impractical since the computer is not always running. So my question is: is it possible to put the notebook files on a (private) SkyDrive Folder and have all the computers sync to there? This way all computers could keep in sync whenever they got access to the web. Can this be done? and, of course, How? [Update] Maybe I should not have taken knowledge about OneNote as granted: OneNote uses a propietary file format, but has a very good in-file-syncing, working on network shares. Generic 'just sync the complete file' won't be useful at all, because I'd just have 'file has changed on server and on client' conflicts all the time. The sync needs to know OneNote files and be able to sync the content - eg. OneNote itself needs to sync the files, not some generic sync tool.

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• installing SVN - CentOS - cannot find -lexpat

  - by furnace

  Hey guys, I'm trying to install SVN on CentOS 5. Unfortunately a simple yum install isn't going to work (afaik) because I'm using the DirectAdmin control panel. When it comes to running 'make' I get this error: /usr/bin/ld: cannot find -lexpat I'm new to installing things without yum (!) so am a bit lost. Do you have any advice on how to get past this hurdle? Just to give a little more context to the error; /apache -I/usr/include/apache -I/etc/svn-install/subversion-1.6.2/sqlite-amalgamation -o subversion/svn/util.o -c subversion/svn/util.c cd subversion/svn && /bin/sh /etc/svn-install/subversion-1.6.2/libtool --tag=CC --silent --mode=link gcc -g -O2 -g -O2 -pthread -rpath /usr/lib -o svn add-cmd.o blame-cmd.o cat-cmd.o changelist-cmd.o checkout-cmd.o cleanup-cmd.o commit-cmd.o conflict-callbacks.o copy-cmd.o delete-cmd.o diff-cmd.o export-cmd.o help-cmd.o import-cmd.o info-cmd.o list-cmd.o lock-cmd.o log-cmd.o main.o merge-cmd.o mergeinfo-cmd.o mkdir-cmd.o move-cmd.o notify.o propdel-cmd.o propedit-cmd.o propget-cmd.o proplist-cmd.o props.o propset-cmd.o resolve-cmd.o resolved-cmd.o revert-cmd.o status-cmd.o status.o switch-cmd.o tree-conflicts.o unlock-cmd.o update-cmd.o util.o ../../subversion/libsvn_client/libsvn_client-1.la ../../subversion/libsvn_wc/libsvn_wc-1.la ../../subversion/libsvn_ra/libsvn_ra-1.la ../../subversion/libsvn_delta/libsvn_delta-1.la ../../subversion/libsvn_diff/libsvn_diff-1.la ../../subversion/libsvn_subr/libsvn_subr-1.la /etc/httpd/lib/libaprutil-1.la -lexpat /etc/httpd/lib/libapr-1.la -luuid -lrt -lcrypt -lpthread -ldl /usr/bin/ld: cannot find -lexpat collect2: ld returned 1 exit status make: *** [subversion/svn/svn] Error 1 Thanks!

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• Automount in Ubuntu 9.10

  - by easyrider

  Hi, By default Ubuntu doesn't mount internal NTFS hard drives automatically. A fstab solution not working properly, because of conflicts with the "intelligent" mount system. If I add my hd in fstab and reboot - it will be mounted. But if I go to nautilus, open places panel and click eject button (unmount) and than click on hd again to mount it, I will get an error. In 9.04 to solve this problem you need to modify hal rules in /etc/hal/... preferences.fdi in my case I modified it for only one drive. <device> - <match key="storage.hotpluggable" bool="false"> - <match key="storage.removable" bool="false"> <merge key="storage.automount_enabled_hint" type="bool">false</merge> - <match key="storage.model" string="ST3250310NS"> <merge key="storage.automount_enabled_hint" type="bool">true</merge> </match> </match> </match> </device> But this is not working in 9.10 - devs removed this function from hal to devkit-disk or udev? I don't know. Could you please tell me where automount rules are stored in 9.10? And how to create new rules, and what program controls automount in 9.10?

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• My computer loses network connectivity every 30 minutes

  - by Logan Garland

  My LAN connected PC loses network connectivity every 30 minutes. It has a static IP address and I've checked to make sure there aren't any IP conflicts on my network. If I'm streaming from that PC to my Xbox the stream will be interrupted and it normally takes about a minute to come back online. The same happens if I'm actually on the PC and just browsing the web. I'm looking for suggestions on how to track down this issue. I've tried checking the available logs on my router to see if there is an issue with DCHP but have been unsuccessful in finding any evidence. Any suggestions would be helpful. I can't think of any recent changes to my network, PC or software installations that may have caused this. I am a software developer and have intermediate networking knowledge. EDIT: During one outage I told windows to troubleshoot the network problem and it said that it could automatically fix the problem by changing DCHP info. It basically said my network adapter from static to automatically obtain. This did fix the issue quicker than just waiting it out, but the outage occurred again 30 minutes later even when leaving those settings.

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• Mirror a Dropbox repository in Sharepoint and restrict access

  - by Dan Robson

  I'm looking for an elegant way to solve the following problem: My development team uses Dropbox for sharing documents amongst our immediate group. We'd like to put some of those documents into a SharePoint repository for the larger group to be able to access, as granting Dropbox access to the group at large is not ideal. However, we'd like to continue to be able to propagate changes to the SharePoint site simply by updating the files in Dropbox on our local client machines, and also vice versa - users granted access on SharePoint that update files in that workspace should be able to save their files and the changes should appear automatically on our client PC's. I've already done the organization of the folders so that in Dropbox, there exists a SharePoint folder that looks something like this: SharePoint ----Team --------Restricted Access Folders ----Organization --------Open Access Folders The Dropbox master account and the SharePoint master account are both set up on my file server. Unfortunately, Dropbox doesn't seem to allow syncing of folders anywhere above the \Dropbox\ part of the file system's hierarchy - or all I would have to do is find where the Sharepoint repository is maintained locally, and I'd be golden. So it seems I have to do some sort of 2-way synchronization between the Dropbox folder on the file server and the SharePoint folder on the file server. I messed around with Microsoft SyncToy, but it seems to be lacking in the area of real-time updating - and as much as I love rsync, I've had nothing but bad luck with it on Windows, and again, it has to be kicked off manually or through Task Scheduler - and I just have a feeling if I go down that route, it's only a matter of time before I get conflicts all over the place in either Dropbox, SharePoint, or both. I really want something that's going to watch both folders, and when one item changes, the other automatically updates in "real-time". It's quite possible I'm going down the entirely wrong route, which is why I'm asking the question. For simplicity's sake, I'll restate the goal: To be able to update Dropbox and have it viewable on the SharePoint site, or to update the SharePoint site and have it viewable in Dropbox. And since I'm a SharePoint noob, I'll also need help hiding the "Team" subfolder from everyone not in a specific group in AD.

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• Calendar sharing between unrelated Domains

  - by vlannoob

  I have a 'request' from one of the 'big guys' that has me scratching my head a bit. He is one of our Executives that also is a board member of several other organistations, so he floats around between 4 different unrelated companies, each with their own domains, Exchange setup etc. He has domain accounts in each organisation. He has an iPad with multiple Exchange accounts so he can see all his calendars which works Ok for him - Apple calendaring bugs/flaws aside. What he wants is the ability for 'reception staff' at each organisation to 'see' all his calendars as they are booking things for him in their respective organisations calendars without it conflicting with bookings made in his calendars by other organisations......you with me?? So for example: Company A books a meeting into his Comapny A calendar at 9am Monday and Company B books him a meeting in his Company B Calendar at 9:15am Monday on the other side of town and of course Company C has him booked in all day Monday on their Company C calendar. He gets all those on his iPad but he would like either a 'global' calendar all can see and book into or the ability for receptionists at Company's A,B and C to see all the Calendars to avoid these kind of conflicts. I told him to 'go away' straight off the bat, I don't control anything to do with the other companies or know their infrastructure. And quite frankly I don't want any part of it...but he's whining and he's high enough up the food chain that I can't ignore him forever. I'm open to suggestions. Is there any third party software/services that can facilitiate this kind of setup? I really don't want to be creating users in my AD structure to people not ion our organisation so they can get access to his calendar and I am sure there sysadmins feel the same. As usual - any advice is greatly appreciated ;)

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• Yum installing wrong MySQL version on CentOS 5 (Amazon)

  - by Marius Stuparu

  I'm having trouble with a CentOS server running on AWS. This is CentOS 5.6 i386 from RightImage, but the problem was the same on all RightScale AMIs. When issuing the following command: yum install mysql mysql-server mysql-devel the only packages proposed by yum are MySQL-devel-community and MySQL-server-community. Which would't be a problem, except this package is old/incomplete, because it does not create a "mysqld" service, only a /etc/init.d/mysql (notice the missing d). That would't be a problem, I can start the service by doing ./etc/init.d/mysql start, and it starts OK, but there is no "mysql" (or other mysql*) command available. If I try to force a different version (yum install mysql50-server...) I get this yum error: mysql-5.0.77-4.el5_6.6.i386 from updates has depsolving problems --> mysql conflicts with MySQL-server-community (even when I don't have MySQL-server-community installed). I have tried this before and after yum update, in a fresh image. How can I install a working version of MySQL? I'm stuck on CentOS 5 because I want to install Kloxo (which does not yet support CentOS 6). I'm not interested in Webmin, and I can't afford cPanel. Thanks!

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• Nginx proxy with Redmine SVN authentication.

  - by Omegaice

  I am attempting to setup a system where I have an nginx server running as a reverse proxy for multiple websites that I want to run. To separate the websites I have created a Linux container which contains each site to allow me to reduce conflicts in database usage etc. I am currently trying to get my main site working and have nginx with passenger setup and connecting to redmine and I have an Apache install specifically setup for serving the SVN over HTTP and am attempting to use the redmine authentication with that. I have set everything up as described in the redmine howtos, but when I check a project out from the SVN it always works even if the project is private and whenever I try and commit to the repositories it fails saying "Could not open the requested SVN filesystem", the Apache error log related to that event is "(20014)Internal error: Can't open file '/srv/rcs/svn/error/format': No such file or directory". If I take out the redmine authentication I can checkout and check-in repositories fine but there is no authentication. Does anyone have any ideas? Edit I tried to solve this problem another way by attempting to have the authentication work by LDAP, I managed to get it so that my user could log into the redmine website but as soon as I tried to check anything out it said that access was forbidden to the repository.

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• SQL transaction log backups conflicting with full backups?

  - by BradC

  On our SQL servers (2000, 2005, and 2008), we run full backups once a day in the evening, and transaction log backups every 2 hrs. We haven't really worried about these two processes conflicting, but lately we've run into some of the following issues: On one server, the trans log backup occasionally blocks the full backup, and must be manually stopped before the full backup can complete We sometimes end up with a massively-sized trans log backup file (sometimes larger than the full backup!) that seems to occur at the same time the full backup is running. I found a reference that indicate that these are "not allowed" to run at the same time, whatever that means: SQL 2000 Books Online and SQL 2005 Books Online. I'm not sure whether that means that the server will simply prevent them from running simultaneously, or if we ought to be explicitly stopping the log backups while the full backups are running. So are there known conflicts/issues between these? Does the answer differ between SQL versions? Should I have the trans log backup job check to see if the full backup is running before it executes? (and how do I do that...?)

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• NIS user not being added to NIS group

  - by Brian

  I have set up a NIS server and several NIS clients. I have a user and a group on the NIS server like so: /etc/passwd: myself:x:5000:5000:,,,:/home/myself:/bin/bash /etc/group: fishy:x:3001:otheruser,etc,myself,moreppl I imported the users and groups on the NIS client by adding +:::::: to /etc/passwd and +::: to /etc/group. I can log in to the NIS client, but when I run groups, fishy is not listed. But getent group fishy shows that it was imported correctly and lists me as a member. And if I do sudo su - myself, then suddenly groups says I am in the group! I also had nscd installed, and the groups worked correctly for a while. It seemed like after being logged in for a while, I would silently be dropped out of the group. If I restarted nscd and logged in again, then the groups worked correctly...for a while. There are no UID or GID conflicts with local users or groups. Update: Contents of /etc/nsswitch.conf: passwd: compat group: compat shadow: compat hosts: files nis dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis aliases: nis files

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