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  • Keep website and webservices warm with zero coding

    - by oazabir
    If you want to keep your websites or webservices warm and save user from seeing the long warm up time after an application pool recycle, or IIS restart or new code deployment or even windows restart, you can use the tinyget command line tool, that comes with IIS Resource Kit, to hit the site and services and keep them warm. Here’s how: First get tinyget from here. Download and install the IIS 6.0 Resource Kit on some PC. Then copy the tinyget.exe from “c:\program files…\IIS 6.0 ResourceKit\Tools'\tinyget” to the server where your IIS 6.0 or IIS 7 is running. Then create a batch file that will hit the pages and webservices. Something like this: SET TINYGET=C:\Program Files (x86)\IIS Resources\TinyGet\tinyget.exe"%TINYGET%" -srv:dropthings.omaralzabir.com -uri:http://dropthings.omaralzabir.com/ -status:200"%TINYGET%" -srv:dropthings.omaralzabir.com -uri:http://dropthings.omaralzabir.com/WidgetService.asmx?WSDL - status:200 First I am hitting the homepage to keep the webpage warm. Then I am hitting the webservice URL with ?WSDL parameter, which allows ASP.NET to compile the service if not already compiled and walk through all the operations and reflect on them and thus loading all related DLLs into memory and reducing the warmup time when hit. Tinyget gets the servers name or IP in the –srv parameter and then the actual URI in the –uri. I have specified what’s the HTTP response code to expect in –status parameter. It ensures the site is alive and is returning http 200 code. Besides just warming up a site, you can do some load test on the site. Tinyget can run in multiple threads and run loops to hit some URL. You can literally blow up a site with commands like this: "%TINYGET%" -threads:30 -loop:100 -srv:google.com -uri:http://www.google.com/ -status:200 Tinyget is also pretty useful to run automated tests. You can record http posts in a text file and then use it to make http posts to some page. Then you can put matching clause to check for certain string in the output to ensure the correct response is given. Thus with some simple command line commands, you can warm up, do some transactions, validate the site is giving off correct response as well as run a load test to ensure the server performing well. Very cheap way to get a lot done.

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  • Warm Reception By Partners at EMEA Manageability Forum

    - by Get_Specialized!
    For the EMEA Partners that were able to attend the event in Istanbul Turkey, thank you for your attendance and feedback at the event. As you can see, the weather kept most of inside during the event and at times there was even some snow.  And while it may have been chilly outside, there was a warm reception from Partners who traveled from all over EMEA to hear from other Oracle Specialized Partners and subject matter experts about the opportunities and benefits of Oracle Enterprise Manager and Exadata Specialization. Here you can see David Robo, Oracle Technology Director for Manageability kicking off the event followed later by Patrick Rood, Oracle Indirect Manageability Business. A special thank you to all the Partner speakers including Ron Tolido, VP and CTO of Application Services Continental Europe Capgemini, who delivered a very innovative keynote where many in attendance learned that Black Swans do exist. And while at break, interactivity among partners continued and it was great to see such innovative partners who had listed their achieved specializations on their business cards. Here we can see Oracle Enterprise Manager customer, Turkish Oracle User Group board member and Blogger Gokhan Atil sharing his product experiences with others attending. Additionally, Christian Trieb of Paragon Data, also shared with other Partners what the German Oracle User Group (DOAG) was doing around manageability and invitation to submit papers for their next event. Here we can see at one of the breaks, one of the event organizers Javier Puerta (left), Oracle Director of Partner Programs, joined by Sebastiaan Vingerhoed (middle), Oracle EE & CIS Manager Manageability and speaker on Managing the Application Lifecycle, Julian Dontcheff (right), Global Head of Database Management at Accenture. Below is Julian Dontcheff's delivering his partner presentation on Exadata and Lifecycle Management. Just after his plane landed and 1 hour Turkish taxi experience to the event location, Julian still took the time to sit down with me and provide some extra insights on his experiences of managing the enterprise infrastructure with Oracle Enterprise Manager. Below is one of the Oracle Enterprise Management Product Management Team,  Mark McGill, Oracle Principal Product Manager, presenting to Partners on how you can perform Chargeback and Metering with Oracle Enterprise Manager 12c Cloud Control. Overall, it was a great event and an extra thank you to those OPN Specialized Partners who presented, to the Partners that attended, and to those Oracle team members who organized the event and presented.

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  • Warm Up Your Desktop with the Caribbean Shores Theme for Windows 7 & 8

    - by Asian Angel
    Are you in the mood for some tropical scenery? Then enjoy a view of quiet coves, clear water, palm trees, and gently rolling surf with the Caribbean Shores Theme for Windows 7 and 8. The theme comes with twelve awesome images to provide the perfect relaxing environment on your desktop. Download the Caribbean Shores Theme [Windows 7 & 8 Personalization Gallery] Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It How To Delete, Move, or Rename Locked Files in Windows

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  • Candidate Elimination Question---Please help!

    - by leon
    Hi , I am doing a question on Candidate Elimination Algorithm. I am a little confused with the general boundary G. Here is an example, I got G and S to the fourth case, but I am not sure with the last case. Sunny,Warm,Normal,Strong,Warm,Same,EnjoySport=yes Sunny,Warm,High,Strong,Warm,Same,EnjoySport=yes Rainy,Cold,High,Strong,Warm,Change,EnjoySport=no Sunny,Warm,High,Strong,Cool,Change,EnjoySport=yes Sunny,Warm,Normal,Weak,Warm,Same,EnjoySport=no What I have here is : S 0 :{0,0,0,0,0,0} S 1 :{Sunny,Warm,Normal,Strong,Warm,Same} S 2 , S 3 : {Sunny,Warm,?,Strong,Warm,Same} S 4 :{Sunny,Warm,?,Strong,?,?} G 4 :{Sunny,?,?,?,?,?,?,Warm,?,?,?,?} G 3 :{Sunny,?,?,?,?,?,?,Warm,?,?,?,?,?,?,?,?,?,Same} G 0 , G 1 , G 2 : {?,?,?,?,?,?} What would be the result of G5? Is it G5 empty? {}? or {???Strong??) ? Thanks

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  • recyle application pool,Warm up scripts-Performance tuning in Sharepoint WCM site

    - by joel14141
    I was trying to tune WCM public facing site we have in Sharepoint . I have following doubts By default application pools are set to recycle themselves at 2 am in night and because of that we need warm up scripts . But As I was googling on this topic I found mixed reactions on this some MVP are saying its not advisable to recycle application pool daily and some say otherwise so I am confused. Because if I am not doing recycling application pool then I don't hv to use warmup scripts . But as my site is public facing and its all around the globe so is it advisable that I should recycle it daily as it will affect the performance of my site even though I would run warm up scripts once I don't think so it wud be as good as it should be ....Any advice on that?

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  • recyle application pool,Warm up scripts-Performance tuning in Sharepoint WCM site

    - by joel14141
    I was trying to tune WCM public facing site we have in Sharepoint . I have following doubts By default application pools are set to recycle themselves at 2 am in night and because of that we need warm up scripts . But As I was googling on this topic I found mixed reactions on this some MVP are saying its not advisable to recycle application pool daily and some say otherwise so I am confused. Because if I am not doing recycling application pool then I don't hv to use warmup scripts . But as my site is public facing and its all around the globe so is it advisable that I should recycle it daily as it will affect the performance of my site even though I would run warm up scripts once I don't think so it wud be as good as it should be ....Any advice on that?

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  • USB Drive Warm Boot Issue. Cold boot = Perfect. Warm boot = "No boot sector found on USB device"

    - by Dan
    I'm experiencing a boot/reboot quirk similar to, yet somewhat different from others posted here. I have two Western Digital "Passport" external USB2 drives (160GB and 320GB) with Ubuntu 11.10 installed. The BIOS on my laptop is set to boot USB drives before the internal drive, and it works well. Either drive will cold-boot Ubuntu 11.10 perfectly. However, at times the computer must be restarted (warm boot) to have software updates or other changes take effect. When I warm-boot the computer, the computer goes through its normal shutdown/restart, then the usual BIOS tests, at which time the USB drive is selected momentarily (as normal), and that's when the trouble starts. I get a "No boot sector found on USB device", and the computer proceeds to boot Windows from the internal drive. If I press F12 early during the restart sequence (allows manual selection of the boot sequence), USB is still shown before the internal drive on the sequence list (as it should be). If I highlight "USB" and press ENTER, I still get a "No boot sector..." error message, but the external USB drive then proceeds to boot Ubuntu normally. I have a third external USB drive (Western Digital 160 GB Media Center) that cold-boots and warm-boots perfectly, so I know everything in the computer is set up properly. It also tells me Ubuntu is set up correctly on the drives, as all three drives were done identically, and at the same time. I've tried formatting the Passport drives NTFS and FAT32, but it didn't change anything. If I power-down the computer, then start it up again, it will boot Ubuntu from either of the Passport drives perfectly - every time. It's as if during a warm boot the Passport drives are somehow looking for the boot loader in the wrong location on the drive - yet either drives works when booting from a cold start. Not a show-stopper .. but frustrating. Computer is a Dell XPS M1530, A12 BIOS (latest), but I don't think the computer plays into the issue because one of the three drives works at all times. It's only the two WD Passport models at issue here. Thanks!

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  • Which linear programming package should I use for high numbers of constraints and "warm starts"

    - by davidsd
    I have a "continuous" linear programming problem that involves maximizing a linear function over a curved convex space. In typical LP problems, the convex space is a polytope, but in this case the convex space is piecewise curved -- that is, it has faces, edges, and vertices, but the edges aren't straight and the faces aren't flat. Instead of being specified by a finite number of linear inequalities, I have a continuously infinite number. I'm currently dealing with this by approximating the surface by a polytope, which means discretizing the continuously infinite constraints into a very large finite number of constraints. I'm also in the situation where I'd like to know how the answer changes under small perturbations to the underlying problem. Thus, I'd like to be able to supply an initial condition to the solver based on a nearby solution. I believe this capability is called a "warm start." Can someone help me distinguish between the various LP packages out there? I'm not so concerned with user-friendliness as speed (for large numbers of constraints), high-precision arithmetic, and warm starts. Thanks!

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  • postfix check warm me that some file differ

    - by Nicolas BADIA
    If I run postfix check on my debian squeeze server, I get this: postfix/postfix-script: warning: /var/spool/postfix/lib/libnss_nisplus-2.11.3.so and /lib/libnss_nisplus-2.11.3.so differ postfix/postfix-script: warning: /var/spool/postfix/lib/libnss_files-2.11.3.so and /lib/libnss_files-2.11.3.so differ postfix/postfix-script: warning: /var/spool/postfix/lib/libnss_compat-2.11.3.so and /lib/libnss_compat-2.11.3.so differ postfix/postfix-script: warning: /var/spool/postfix/lib/libnss_hesiod-2.11.3.so and /lib/libnss_hesiod-2.11.3.so differ postfix/postfix-script: warning: /var/spool/postfix/lib/libnss_nis-2.11.3.so and /lib/libnss_nis-2.11.3.so differ postfix/postfix-script: warning: /var/spool/postfix/lib/libnss_dns-2.11.3.so and /lib/libnss_dns-2.11.3.so differ Somebody know a solution to fix this ?

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  • Sega lance des jeux vidéos dirigés par les jets d'urine, dont les consoles sont installées dans les urinoirs

    Sega lance des jeux vidéos dirigés par des jets d'urine, dont les consoles sont installées dans les urinoirs Ras-le-bol des jeux vidéos conventionnels ? Pas tenté par les nouvelles consoles à détection de mouvements comme le Kinect ? Sega a pensé à vous. La firme vient en effet de lancer un nouveau concept qui est actuellement testé à Tokio, dans quatre stations de métro. Cette nouvelle console de jeux s'appelle Toylets et, comme son nom l'indique, elle s'utilise dans les urinoirs. Pas de manettes, mais des capteurs de pression mesurant l'intensité du jet de votre urine. Pour diriger votre personnage, modifiez la direction de votre émission de liquide, comme dans le "Vent du Nord&qu...

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  • MATLAB: Designing a "Warm Start"

    - by squall14414
    I'm currently coding a function in MATLAB that has two steps: It processes some data It does some calculations on the processed data I'm using the function to run a series of experiments, where I tweak the way calculations occur in step 2). Seeing how I'm working with a large dataset and the data processing step takes a while each time, however, I'm wondering whether there is anyway to code in a "warm start" in the function. That is to say, is there anyway to save all the progress that I've done after step 1) so that if I run the function a second or third time, it can skip step 1) and go right to step 2)?

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  • .NET assembly cache / ngen / jit image warm-up and cool-down behavior

    - by Mike Jiang
    Hi, I have an Input Method (IME) program built with C#.NET 2.0 DLL through C++/CLI. Since an IME is always attaching to another application, the C#.NET DLL seems not able to avoid image address rebasing. Although I have applied ngen to create a native image of that C#.NET 2.0 DLL and installed it into Global Assembly Cache, it didn't improved much, approximately 12 sec. down to 9 sec. on a slow PIII level PC. Therefore I uses a small application, which loads all the components referenced by the C#.NET DLL at the boot up time, to "warm up" the native image of that DLL. It works fine to speed up the loading time to 0.5 sec. However, it only worked for a while. About 30 min. later, it seems to "cool down" again. Is there any way to control the behavior of GAC or native image to be always "hot"? Is this exactly a image address rebasing problem? Thank you for your precious time. Sincerely, Mike

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  • How long does it take in practice to warm up large in-memory databases?

    - by Sim
    Companies such as Peak Hosting are offering 64 core machines with 512Gb RAM for $2K/month. This is a very interesting choice for in-memory databases such as Memcached/Redis as well as databases whose performance degrades rapidly when the data & indexes don't fit in RAM, such as MongoDB. My main concern with monster machines such as these is the time it takes to warm up an in-memory database. In my experience, theoretical metrics, e.g., that SATA can load 100Mb/sec, fall short of what happens in practice. Even at that rate, 100Mb/sec means that loading up 512Gb RAM machine from SATA disks can take over 1 1/2 hours (!). I am looking for real-world reports of warm-up times for machines with very large memory. Please, share details of the software on the machine, data size, storage configuration, e.g., SATA or SSD, network, hosting/cloud provider, if relevant, etc.

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  • Advice needed: warm backup solution for SQL Server 2008 Express?

    - by Mikey Cee
    What are my options for achieving a warm backup server for a SQL Server Express instance running a single database? Sitting beside my production SQL Server 2008 Express box I have a second physical box currently doing nothing. I want to use this second box as a warm backup server by somehow replicating my production database in near real time (a little bit of data loss is acceptable). The database is very small and resources are utilized very lightly. In the case that the production server dies, I would manually reconfigure my application to point to the backup server instead. Although Express doesn't support log shipping natively, I am thinking that I could manually script a poor man's version of it, where I use batch files to take the logs and copy them across the network and apply them to the second server at 5 minute intervals. Does anyone have any advice on whether this is technically achievable, or if there is a better way to do what I am trying to do? Note that I want to avoid having to pay for the full version of SQL Server and configure mirroring as I think it is an overkill for this application. I understand that other DB platforms may present suitable options (eg. a MySQL Cluster), but for the purposes of this discussion, let's assume we have to stick to SQL Server.

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  • Does Windows Azure support the Application Warm-Up module or something similar?

    - by Corey O'Brien
    We have a Web Role that we are hosting in Windows Azure that uses an old ASMX based Web Reference to contact an external system. The Web Reference proxy code is big enough that instantiating it the first time has a significant cost. We'd like to be able to have this run when the Web Role starts instead of on the first request. I know IIS 7.5 has an Application Warm-Up module that would allow us to achieve this, but I'm having trouble figuring out if something similar exists with hosting on Windows Azure. Thanks, Corey

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  • why my test performance class gives me inconsistent results even after proper warm-up?

    - by colinfang
    i made a class which helps me measure time for any methods in Ticks. Basically, it runs testing method 100x, and force GC, then it records time taken for another 100x method runs. x64 release ctrl+f5 VS2012/VS2010 the results are following: 2,914 2,909 2,913 2,909 2,908 2,907 2,909 2,998 2,976 2,855 2,446 2,415 2,435 2,401 2,402 2,402 2,399 2,401 2,401 2,400 2,399 2,400 2,404 2,402 2,401 2,399 2,400 2,402 2,404 2,403 2,401 2,403 2,401 2,400 2,399 2,414 2,405 2,401 2,407 2,399 2,401 2,402 2,401 2,404 2,401 2,404 2,405 2,368 1,577 1,579 1,626 1,578 1,576 1,578 1,577 1,577 1,576 1,578 1,576 1,578 1,577 1,578 1,576 1,578 1,577 1,579 1,585 1,576 1,579 1,577 1,579 1,578 1,579 1,577 1,578 1,577 1,578 1,576 1,578 1,577 1,578 1,599 1,579 1,578 1,582 1,576 1,578 1,576 1,579 1,577 1,578 1,577 1,591 1,577 1,578 1,578 1,576 1,578 1,576 1,578 As you can see there are 3 phases, first is ~2,900, second is ~2,400, then ~1,550 What might be the reason to cause it? the test performance class code follows: public static void RunTests(Func<long> myTest) { const int numTrials = 100; Stopwatch sw = new Stopwatch(); double[] sample = new double[numTrials]; Console.WriteLine("Checksum is {0:N0}", myTest()); sw.Start(); myTest(); sw.Stop(); Console.WriteLine("Estimated time per test is {0:N0} ticks\n", sw.ElapsedTicks); for (int i = 0; i < numTrials; i++) { myTest(); } GC.Collect(); string testName = myTest.Method.Name; Console.WriteLine("----> Starting benchmark {0}\n", myTest.Method.Name); for (int i = 0; i < numTrials; i++) { sw.Restart(); myTest(); sw.Stop(); sample[i] = sw.ElapsedTicks; } double testResult = DataSetAnalysis.Report(sample); for (int j = 0; j < numTrials; j = j + 5) Console.WriteLine("{0,8:N0} {1,8:N0} {2,8:N0} {3,8:N0} {4,8:N0}", sample[j], sample[j + 1], sample[j + 2], sample[j + 3], sample[j + 4]); Console.WriteLine("\n----> End of benchmark"); }

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  • Grails validateable not work for non-persistent domain class

    - by Hoàng Long
    I followed the instruction here: http://www.grails.org/doc/latest/guide/7.%20Validation.html and added into config.groovy: grails.validateable.classes = [liningtest.Warm'] Then added in src/groovy/Warm.groovy (it's a non-persistent domain class): package liningtest import org.codehaus.groovy.grails.validation.Validateable class Warm { String name; int happyCite; Warm(String n, int h) { this.name = n; this.happyCite = h; } static constraints = { name(size: 1..50) happyCite(min: 100) } } But it just doesn't work (both "blank false" & "size: 0..25") for the "hasErrors" function. It always returns false, even when the name is 25. Is this a Grails bug, if yes, is there any work-around? I'm using Grails 1.3.3 UPDATE: I have updated the simplified code. And now I know that constraint "size" can't be used with "blank", but still does not work. My test class in test/unit/liningtest/WarmTests.groovy package liningtest import grails.test.* class WarmTests extends GrailsUnitTestCase { protected void setUp() { super.setUp() } protected void tearDown() { super.tearDown() } void testSomething() { def w = new Warm('Hihi', 3) assert (w.happyCite == 3) assert (w.hasErrors() == true) } } And the error I got: <?xml version="1.0" encoding="UTF-8" ?> <testsuite errors="1" failures="0" hostname="evolus-50b0002c" name="liningtest.WarmTests" tests="1" time="0.062" timestamp="2010-12-16T04:07:47"> <properties /> <testcase classname="liningtest.WarmTests" name="testSomething" time="0.062"> <error message="No signature of method: liningtest.Warm.hasErrors() is applicable for argument types: () values: [] Possible solutions: hashCode()" type="groovy.lang.MissingMethodException">groovy.lang.MissingMethodException: No signature of method: liningtest.Warm.hasErrors() is applicable for argument types: () values: [] Possible solutions: hashCode() at liningtest.WarmTests.testSomething(WarmTests.groovy:18) </error> </testcase> <system-out><![CDATA[--Output from testSomething-- ]]></system-out> <system-err><![CDATA[--Output from testSomething-- ]]></system-err> </testsuite> UPDATE 2: When I don't use Unit test, but try to call hasErrors in the controller, it runs but return false value. (hasErrors return false with Warm('Hihi', 3) ). Does anyone has a clue?

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  • Getting 'choice' to work in Highline Ruby Gem without error and getting variable from it

    - by The Warm Jets
    I'm having a couple of problems using Highline in Ruby, and trying to get the choice element, detailed here, to work. At the moment the following code produces the error "error: wrong number of arguments (0 for 1). Use --trace to view backtrace" How do I get the variable out of choice? At the moment I have the 'do' setup, but I have no idea about how to get the variable the user has chosen out and into a variable for use elsewhere. Sorry if this is a bit beginner, I'm brand new to ruby and this is my first project, in at the deep end. Thanks in advance. if agree("Are these files going to be part of a set? ") set_title = ask("Title: ") set_desc = ask("Description:") set_genre = ask("Genre: ") set_label = ask("Record Label: ") set_date = ask_for_date("Release Date (yy-mm-dd): ") set_label = ask("EAN/UPC: ") set_buy = ask("Buy this set link: ") set_tags = ask_for_array("Tags (seperated by space): ") # Sort out license choose do |menu| menu.prompt = "Please choose the license for this set? " menu.choices(:all_rights_reserved, :cc_by) do # put the stuff in a variable end end end # End setup set

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  • My fingers are cold when using my computer - solutions?

    - by Kjensen
    This might seem silly, and if there is no good and practical solution... I will live. I am a programmer and sit at a computer 10 hours a day - and even though the rest of me is nice and warm (at least warm), my fingers are cold as ice. Are there some gadgets or tricks to keep your fingers warm while typing/mousing? Gloves do not seem like a good solution, since it hinders the movement of the fingers. I have sometimes put my extra laptop next to the mouse pad, so that it vents hot air on the mouse - and that works... But it is not very practical, plus it only works for one hand (and not very well). Tips?

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  • What Is The Proper Laptop Battery Care While Running Laptop Solely On Battery?

    - by Boris_yo
    Because of convenience, I had to move my laptop to another room away from room where I always ran laptop on UPS without using battery. Since so far I always run laptop on battery, I question the proper usage to prolong battery life. Currently I run laptop on battery with power supply so battery is constantly being charged until it is full 100% and when it is, I disconnect power supply and continue working until battery meter shows 10% remaining. That's when I plug in power supply and let it charge until 100% once again while I work. But it takes a lot of time to fully charge laptop while working since my power supply is 60W which should be the reason of such slow charge and I think the kind of charger that I use is express charger. The thought of charging laptop until full, all while doing my work makes me think that if it takes way more time to charge, it might keep battery running warm for the period of charging time which brings me to question about whether I should keep running laptop as I've described above or it would be better to leave power supply constantly connected to laptop to keep battery between 99%-100%? On one hand it won't keep battery warm but it will try to frequently supply charge to battery once it gets 99% to replenish charge to 100% (which might reduce battery life?). On the other hand if I'll keep working solely on battery and recharge it when below 10%, the battery will get warm but only when charged. Can anybody suggest the correct way of running laptop on battery to ensure better battery life? Dell Latitude E6420 Windows 7 64-bit

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  • Where'd My Data Go? (and/or...How Do I Get Rid of It?)

    - by David Paquette
    Want to get a better idea of how cascade deletes work in Entity Framework Code First scenarios? Want to see it in action? Stick with us as we quickly demystify what happens when you tell your data context to nuke a parent entity. This post is authored by Calgary .NET User Group Leader David Paquette with help from Microsoft MVP in Asp.Net James Chambers. We got to spend a great week back in March at Prairie Dev Con West, chalk full of sessions, presentations, workshops, conversations and, of course, questions.  One of the questions that came up during my session: "How does Entity Framework Code First deal with cascading deletes?". James and I had different thoughts on what the default was, if it was different from SQL server, if it was the same as EF proper and if there was a way to override whatever the default was.  So we built a set of examples and figured out that the answer is simple: it depends.  (Download Samples) Consider the example of a hockey league. You have several different entities in the league including games, teams that play the games and players that make up the teams. Each team also has a mascot.  If you delete a team, we need a couple of things to happen: The team, games and mascot will be deleted, and The players for that team will remain in the league (and therefore the database) but they should no longer be assigned to a team. So, let's make this start to come together with a look at the default behaviour in SQL when using an EDMX-driven project. The Reference – Understanding EF's Behaviour with an EDMX/DB First Approach First up let’s take a look at the DB first approach.  In the database, we defined 4 tables: Teams, Players, Mascots, and Games.  We also defined 4 foreign keys as follows: Players.Team_Id (NULL) –> Teams.Id Mascots.Id (NOT NULL) –> Teams.Id (ON DELETE CASCADE) Games.HomeTeam_Id (NOT NULL) –> Teams.Id Games.AwayTeam_Id (NOT NULL) –> Teams.Id Note that by specifying ON DELETE CASCADE for the Mascots –> Teams foreign key, the database will automatically delete the team’s mascot when the team is deleted.  While we want the same behaviour for the Games –> Teams foreign keys, it is not possible to accomplish this using ON DELETE CASCADE in SQL Server.  Specifying a ON DELETE CASCADE on these foreign keys would cause a circular reference error: The series of cascading referential actions triggered by a single DELETE or UPDATE must form a tree that contains no circular references. No table can appear more than one time in the list of all cascading referential actions that result from the DELETE or UPDATE – MSDN When we create an entity data model from the above database, we get the following:   In order to get the Games to be deleted when the Team is deleted, we need to specify End1 OnDelete action of Cascade for the HomeGames and AwayGames associations.   Now, we have an Entity Data Model that accomplishes what we set out to do.  One caveat here is that Entity Framework will only properly handle the cascading delete when the the players and games for the team have been loaded into memory.  For a more detailed look at Cascade Delete in EF Database First, take a look at this blog post by Alex James.   Building The Same Sample with EF Code First Next, we're going to build up the model with the code first approach.  EF Code First is defined on the Ado.Net team blog as such: Code First allows you to define your model using C# or VB.Net classes, optionally additional configuration can be performed using attributes on your classes and properties or by using a Fluent API. Your model can be used to generate a database schema or to map to an existing database. Entity Framework Code First follows some conventions to determine when to cascade delete on a relationship.  More details can be found on MSDN: If a foreign key on the dependent entity is not nullable, then Code First sets cascade delete on the relationship. If a foreign key on the dependent entity is nullable, Code First does not set cascade delete on the relationship, and when the principal is deleted the foreign key will be set to null. The multiplicity and cascade delete behavior detected by convention can be overridden by using the fluent API. For more information, see Configuring Relationships with Fluent API (Code First). Our DbContext consists of 4 DbSets: public DbSet<Team> Teams { get; set; } public DbSet<Player> Players { get; set; } public DbSet<Mascot> Mascots { get; set; } public DbSet<Game> Games { get; set; } When we set the Mascot –> Team relationship to required, Entity Framework will automatically delete the Mascot when the Team is deleted.  This can be done either using the [Required] data annotation attribute, or by overriding the OnModelCreating method of your DbContext and using the fluent API. Data Annotations: public class Mascot { public int Id { get; set; } public string Name { get; set; } [Required] public virtual Team Team { get; set; } } Fluent API: protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<Mascot>().HasRequired(m => m.Team); } The Player –> Team relationship is automatically handled by the Code First conventions. When a Team is deleted, the Team property for all the players on that team will be set to null.  No additional configuration is required, however all the Player entities must be loaded into memory for the cascading to work properly. The Game –> Team relationship causes some grief in our Code First example.  If we try setting the HomeTeam and AwayTeam relationships to required, Entity Framework will attempt to set On Cascade Delete for the HomeTeam and AwayTeam foreign keys when creating the database tables.  As we saw in the database first example, this causes a circular reference error and throws the following SqlException: Introducing FOREIGN KEY constraint 'FK_Games_Teams_AwayTeam_Id' on table 'Games' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. Could not create constraint. To solve this problem, we need to disable the default cascade delete behaviour using the fluent API: protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<Mascot>().HasRequired(m => m.Team); modelBuilder.Entity<Team>() .HasMany(t => t.HomeGames) .WithRequired(g => g.HomeTeam) .WillCascadeOnDelete(false); modelBuilder.Entity<Team>() .HasMany(t => t.AwayGames) .WithRequired(g => g.AwayTeam) .WillCascadeOnDelete(false); base.OnModelCreating(modelBuilder); } Unfortunately, this means we need to manually manage the cascade delete behaviour.  When a Team is deleted, we need to manually delete all the home and away Games for that Team. foreach (Game awayGame in jets.AwayGames.ToArray()) { entities.Games.Remove(awayGame); } foreach (Game homeGame in homeGames) { entities.Games.Remove(homeGame); } entities.Teams.Remove(jets); entities.SaveChanges();   Overriding the Defaults – When and How To As you have seen, the default behaviour of Entity Framework Code First can be overridden using the fluent API.  This can be done by overriding the OnModelCreating method of your DbContext, or by creating separate model override files for each entity.  More information is available on MSDN.   Going Further These were simple examples but they helped us illustrate a couple of points. First of all, we were able to demonstrate the default behaviour of Entity Framework when dealing with cascading deletes, specifically how entity relationships affect the outcome. Secondly, we showed you how to modify the code and control the behaviour to get the outcome you're looking for. Finally, we showed you how easy it is to explore this kind of thing, and we're hoping that you get a chance to experiment even further. For example, did you know that: Entity Framework Code First also works seamlessly with SQL Azure (MSDN) Database creation defaults can be overridden using a variety of IDatabaseInitializers  (Understanding Database Initializers) You can use Code Based migrations to manage database upgrades as your model continues to evolve (MSDN) Next Steps There's no time like the present to start the learning, so here's what you need to do: Get up-to-date in Visual Studio 2010 (VS2010 | SP1) or Visual Studio 2012 (VS2012) Build yourself a project to try these concepts out (or download the sample project) Get into the community and ask questions! There are a ton of great resources out there and community members willing to help you out (like these two guys!). Good luck! About the Authors David Paquette works as a lead developer at P2 Energy Solutions in Calgary, Alberta where he builds commercial software products for the energy industry.  Outside of work, David enjoys outdoor camping, fishing, and skiing. David is also active in the software community giving presentations both locally and at conferences. David also serves as the President of Calgary .Net User Group. James Chambers crafts software awesomeness with an incredible team at LogiSense Corp, based in Cambridge, Ontario. A husband, father and humanitarian, he is currently residing in the province of Manitoba where he resists the urge to cheer for the Jets and maintains he allegiance to the Calgary Flames. When he's not active with the family, outdoors or volunteering, you can find James speaking at conferences and user groups across the country about web development and related technologies.

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  • The Latest News About SAP

    - by jmorourke
    Like many professionals, I get a lot of my news from Google e-mail alerts that I’ve set up to keep track of key industry trends and competitive news.  In the past few weeks, I’ve been getting a number of news alerts about SAP.  Below are a few recent examples: Warm weather cuts short US maple sugaring season – by Toby Talbot, AP MILWAUKEE – Temperatures in Wisconsin had already hit the high 60s when Gretchen Grape and her family began tapping their 850 maple trees. They had waited for the state's ceremonial tapping to kick off the maple sugaring season. It was moved up five days, but that didn't make much difference. For Grape, the typically month-long season ended nine days later. The SAP had stopped flowing in a record-setting heat wave, and the 5-quart collection bags that in a good year fill in a day were still half-empty. Instead of their usual 300 gallons of syrup, her family had about 40. Maple syrup producers across the North have had their season cut short by unusually warm weather. While those with expensive, modern vacuum systems say they've been able to suck a decent amount of sap from their trees, producers like Grape, who still rely on traditional taps and buckets, have seen their year ruined. "It's frustrating," said the 69-year-old retiree from Holcombe, Wis. "You put in the same amount of work, equipment, investment, and then all of a sudden, boom, you have no SAP." Home & Garden: Too-Early Spring Means Sugaring Woes  - by Georgeanne Davis for The Free Press Over this past weekend, forsythia and daffodils were blooming in the southern parts of the state as temperatures climbed to 85 degrees, and trees began budding out, putting an end to this year's maple syrup production even as the state celebrated Maine Maple Sunday. Maple sugaring needs cold nights and warm days to induce SAP flows. Once the trees begin budding, SAP can still flow, but the SAP is bitter and has an off taste. Many farmers and dairymen count on sugaring for extra income, so the abbreviated season is a real financial loss for them, akin to the shortened shrimping season's effect on Maine lobstermen. SAP season comes to a sugary Sunday finale – Kennebec Journal, March 26th, 2012 Rebecca Manthey stood out in the rain at the entrance of Old Fort Western keeping watch over a cast iron kettle of boiling SAP hooked to a tripod over a wood fire.  Manthey and the rest of the Old Fort Western staff -- decked out in 18th-century attire -- joined sugar houses across the state in observance of Maine Maple Sunday. The annual event is sponsored by the Department of Agriculture and the Maine Maple Producers Association.  She said the rain hadn't kept people from coming to enjoy all the events at the fort surrounding the production of Maple syrup.  "In the 18th century, you would be boiling SAP in the woods, so I would be in the woods," Manthey explained to the families who circled around her. "People spent weeks and weeks in the woods. You don't want to cook it to fast or it would burn. When it looks like the right consistency then you send it (into the kitchen) to be made into sugar." Manthey said she enjoyed portraying an 18th-century woman, even in the rain, which didn't seem to bother visitors either. There was a steady stream of families touring the fort and enjoying the maple syrup demonstrations. I hope you enjoy these updates on SAP – Happy April Fool’s Day!

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