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Merge\Combine two datatables

- by madlan

I'm trying to merge\combine two datatables. I've looked at various examples and answers but they seem to create duplicate rows or require indexes (merge on datatable etc) I can't do this via SQL as one source is from a linked Oracle server accessed via MSSQL and the other from a different MSSQL Server that does not have linked access. The data is currently very simple: Name, Email, Phone DataTable1: "John Clark", "", "01522 55231" "Alex King", "[email protected]", "01522 55266" "Marcus Jones", "marcus[email protected]", "01522 55461" DataTable2: "John Clark", "[email protected]", "01522 55231" "Alex King", "[email protected]", "" "Marcus Jones", "marcus[email protected]", "01522 55461" "Warren bean", "[email protected]", "01522 522311" Giving a datatable with the following: "John Clark", "[email protected]", "01522 55231" "Alex King", "[email protected]", "01522 55266" "Marcus Jones", "marcus[email protected]", "01522 55461" "Warren bean", "[email protected]", "01522 522311" Name is the field to match records on, with the first datatable taking priority.

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March Oracle Technology Network Offers

- by Cassandra Clark

Happy March! We are pleased to bring you more new discounts this month. To get discount codes for the books below please visit the Oracle Technology Network Member Discount Page. New DiscountsOracle Press - 40% off the following Oracle Press title - Achieving Extreme Performance with Oracle Exadata Packt Publishing - 20% off print and 40% off ebook formats for the following titles - Oracle GoldenGate 11g Implementerís Guide, John P JeffriesOracle Business Intelligence, Yuli Vasiliev, Oracle Fusion Middleware Patterns, Harish Gaur, Marcus Zirn, et al.Oracle JRockit: The Definitive Guide, Marcus Hirt, Marcus LagergrenExtended offers - see offer page for detailsManning is offering a number of titles for 40% to 42% off with OTN promo codeCRS Press is offering 20% off Secure Java: For Web application Development with OTN promo codePearson is offering 35% and free shipping within the U.S. with OTN promo code on two titles.Apress - 25% pff eBooks purchased on apress.com with OTN promo code.Oracle Store has extended its offer of 15% off Oracle Office Enterprise Edition with OTN promo code.

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Lab Ops 2–The Lee-Robinson Script

Marcus Robinson adapted PowerShell scripts by Thomas Lee to build a set of VMs to run a course in a reliable and repeatable way. With Marcus’s permission, Andrew Fryer has put that Setup Script on SkyDrive, and provided notes on the script. Optimize SQL Server performance“With SQL Monitor, we can be proactive in our optimization process, instead of waiting until a customer reports a problem,” John Trumbul, Sr. Software Engineer. Optimize your servers with a free trial.

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How to configure cache regions in fluent nhibernate and syscache2

- by Marcus Oldin

Hi, I've been trying to implement cache regions with fluent nhibernate and I've done the following so far: Setup caching in Fluently.Configure(): private static ISessionFactory CreateSessionFactory() { string csStringName = Environment.MachineName; var nhibConfigProps = new Dictionary<string, string>(); nhibConfigProps.Add("current_session_context_class","web"); var cfg = Fluently.Configure() .Database(MsSqlConfiguration.MsSql2008 .ConnectionString(c => c.FromConnectionStringWithKey(csStringName)) .ShowSql() .Cache(cache=>cache.ProviderClass<NHibernate.Caches.SysCache2.SysCacheProvider>().UseQueryCache())) .Mappings(m => m.FluentMappings.AddFromAssemblyOf<UserMap>()) .ExposeConfiguration(config => config.AddProperties(nhibConfigProps)) .ExposeConfiguration(config=> config.EventListeners.DeleteEventListeners = new IDeleteEventListener[] {new SoftDeleteListener()}) .ExposeConfiguration(config => new SchemaUpdate(config).Execute(false, true)) .BuildSessionFactory(); return cfg; } Changed my ClassMap to enable cache, and set the region of choice: public UserMap() { Cache.ReadWrite().Region("User"); ... } Hopefully I've done the above correctly, but I can't really figure out where to configure the priority and cache duration for each region. Do you know how to do that? And if you happen to find flaws in the above code I'd really appreciate the feedback. TIA//Marcus

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Restrict Postfix only for allowed Mail-Adresses

- by Marcus

I want to restrict my postfix system. Exactly I will that my postfix allow to send mails only to allowed user, all other mails should be bounced. For example: This Mails should be send: [email protected] [email protected] [email protected] All other Mails should not sended, for Exaple [email protected] [email protected] etc. I tried, the following settings, but it doesn´t work: smtpd_reject_unlisted_sender = yes smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/valid_recipients reject_unlisted_sender reject_unknown_recipient_domain reject Have you any idea how to handle it? BR Marcus

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Linode - Centos 5.5 -

- by Marcus West

Hi, I rather foolishly undertook to install a control panel on a Linode. I opted to use CentOs 5.5 (either ordinary or 64 bit) but I am like a monkey playing a reward game... I have some idea of what I am doing, but not enough.... In certain areas I am hopeless....do I install Webmin/virtualmin, or ISP Config..... ISP Config 2 or 3? I would employ someone to help, but how do i find the right person? Where can i learn the ropes on all this? There seems to be no systematic training, and even when I try to research college courses in the UK, I am none the wiser as to where I could go to learn how to run a Linux server..... Has anyone any pointers? Right now I am looking at th esecurity aspects of the server.....rkhunter , denyhosts etc... Any advice on installing and maintaining these things? Cheers marcus

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JQuery ajax call default timeout value

- by Marcus

I got a bug report that I can't duplicate, but ajax-call timeout is the current best guess. So I'm trying to find out the default value for timeout of a jQuery $.ajax() call. Anybody have an idea? Couldn't find it in jQuery documentation. Thanks in advance, Marcus

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Display HTML in an Actionscript 3 project

- by Marcus Blankenship

Folks, I am pulling all my Flash (pure AS3 project, not Flash CS3) content from a Drupal back-end for SEO purposes. This works great, except the HTML rendering built into the TextField object leaves a lot to be desired. Could anyone recommend any libraries that would allow me to display HTML elements? At this stage, commercial or open-source libraries are welcome. Thanks, Marcus

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create a YYYY-MM-DD Daterange in JScript/Javascript.

- by Marcus

Hello. I need no generate a full daterange in JScript from a given Startdate to now. Startdate: 2010-03-25 2010-03-26 2010-03-27 ... 2010-05-30 I am very confused with Javascript Date. best would be a function to give a daterange as params and getting an Array of the formatted date back, something like that: range[0] = 2010-03-25 range[1] = 2010-03-26 range[2] = 2010-03-27 ... range[x] = 2010-05-30 I am so confused thanks for any hint marcus

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Display custom error page when file upload exceeds allowed size in ASP.NET MVC2

- by Marcus

Hello! My main issue is that I want to display an custom error page when an uploaded file exceeds allowed size (maxRequestLength in web.config). When the big file is uploaded an HttpException is thrown before my upload action method in the controller is invoked. This is expected. I have tried to catch the exception in a custom attribute and also to override OnException in the controller. Why isnt it possible to catch the exception in either the attribute or the OnException method? Its possible though to catch the exception in Application_Error in global.asax but neither Response.Redirect nor Server.Transfer works for redirecting to the custom error page. Server.Transfer gives the "failed to process child request" error and response.redirect gives the "Http headers already sent" error. Any ideas? Thanks in advance! Marcus

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Need help with Zend Framework dynamic Namespaces

- by Marcus Sjölin

I want to make my system redirect unknown requests such as www.address.com/a_company to the adress www.address.com/companies/company/ and display the company a_company if it exists in the database, otherwise throw the user to a 404 not found page. So in detail, I want to make namespace that is as the first example dynamically, if the company exist in the database, I have no problem connecting to the database and retrieving information or finding a way to parse a company name, I just need help how to make my system check and run a function every time the address doesn't exist and show the second page (/companies/company/).. I am using an Acl as well, but I think it should be fine if the page is /companies/company and then possibly add /?c=a_company or similar. Thank you. /Marcus

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Create non-persistent cookie with FormsAuthenticationTicket

- by Marcus

Hello! I'm having trouble creating a non-persistent cookie using the FormsAuthenticationTicket. I want to store userdata in the ticket, so i can't use FormsAuthentication.SetAuthCookie() or FormsAuthentication.GetAuthCookie() methods. Because of this I need to create the FormsAuthenticationTicket and store it in a HttpCookie. My code looks like this: DateTime expiration = DateTime.Now.AddDays(7); // Create ticket FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(2, user.Email, DateTime.Now, expiration, isPersistent, userData, FormsAuthentication.FormsCookiePath); // Create cookie HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, FormsAuthentication.Encrypt(ticket)); cookie.Path = FormsAuthentication.FormsCookiePath; if (isPersistent) cookie.Expires = expiration; // Add cookie to response HttpContext.Current.Response.Cookies.Add(cookie); When the variable isPersistent is true everything works fine and the cookie is persisted. But when isPersistent is false the cookie seems to be persisted anyway. I sign on in a browser window, closes it and opens the browser again and I am still logged in. How do i set the cookie to be non-persistent? Is a non-persistent cookie the same as a session cookie? Is the cookie information stored in the sessiondata on the server or are the cookie transferred in every request/response to the server? Thanks in advance! /Marcus

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Cannot use READPAST in snapshot isolation mode

- by Marcus

I have a process which is called from multiple threads which does the following: Start transaction Select unit of work from work table with by finding the next row where IsProcessed=0 with hints (UPDLOCK, HOLDLOCK, READPAST) Process the unit of work (C# and SQL stored procedures) Commit the transaction The idea of this is that a thread dips into the pool for the "next" piece of work, and processes it, and the locks are there to ensure that a single piece of work is not processed twice. (the order doesn't matter). All this has been working fine for months. Until today that is, when I happened to realise that despite enabling snapshot isolation and making it the default at the database level, the actual transaction creation code was manually setting an isolation level of "ReadCommitted". I duly changed that to "Snapshot", and of course immediately received the "You can only specify the READPAST lock in the READ COMMITTED or REPEATABLE READ" error message. Oops! The main reason for locking the row was to "mark the row" in such a way that the "mark" would be removed when the transaction that applied the mark was committed and the lock seemed to be the best way to do this, since this table isn't read otherwise except by these threads. If I were to use the IsProcessed flag as the lock, then presumably I would need to do the update first, and then select the row I just updated, but I would need to employ the NOLOCK flag to know whether any other thread had set the flag on a row. All sounds a bit messy. The easiest option would be to abandon the snapshot isolation mode altogether, but the design of step #3 requires it. Any bright ideas on the best way to resolve this problem? Thanks Marcus

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JRockit R28/JRockit Mission Control 4.0 is out!

- by Marcus Hirt

The next major release of JRockit is finally out! Here are some highlights: Includes the all new JRockit Flight Recorder – supersedes the old JRockit Runtime Analyser. The new flight recorder is inspired by the “black box” in airplanes. It uses a highly efficient recording engine and thread local buffers to capture data about the runtime and the application running in the JVM. It can be configured to always be on, so that whenever anything “interesting” happens, data can be dumped for some time back. Think of it as your own personal profiling time machine. Automatic shortest path calculation in Memleak – no longer any need for running around in circles when trying to find your way back to a thread root from an instance. Memleak can now show class loader related information and split graphs on a per class loader basis. More easily configured JMX agent – default port for both RMI Registry and RMI Server can be configured, and is by default the same, allowing easier configuration of firewalls. Up to 64 GB (was 4GB) compressed references. Per thread allocation profiling in the Management Console. Native Memory Tracking – it is now possible to track native memory allocations with very high resolution. The information can either be accessed using JRCMD, or the dedicated Native Memory Tracking experimental plug-in for the Management Console (alas only available for the upcoming 4.0.1 release). JRockit can now produce heap dumps in HPROF format. Cooperative suspension – JRockit is no longer using system signals for stopping threads, which could lead to hangs if signals were lost or blocked (for example bad NFS shares). Now threads check periodically to see if they are suspended. VPAT/Section 508 compliant JRMC – greatly improved keyboard navigation and screen reader support. See New and Noteworthy for more information. JRockit Mission Control 4.0.0 can be downloaded from here: http://www.oracle.com/technology/software/products/jrockit/index.html <shameless ad> There is even a book to go with JRMC 4.0.0/JRockit R28! http://www.packtpub.com/oracle-jrockit-the-definitive-guide/book/ </shameless ad>

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The JRockit Performance Counters

- by Marcus Hirt

Every now and then I get a question regarding what the attributes in the PerfCounters dynamic MBean represent. Now, all the MBeans under the oracle.jrockit.management (bea.jrockit.management pre R28) domain are part of what we call JMXMAPI (the JRockit JMX based Management API), which is unsupported. Therefore there is no official documentation for the API. I did however write a bit about JMXMAPI in my recent JRockit book, Oracle JRockit: The Definitive Guide. The information in the table below is from that book: Counter Description java.cls.loadedClasses The number of classes loaded since the start of the JVM. java.cls.unloadedClasses The number of classes unloaded since the start of the JVM. java.property.java.class.path The class path of the JVM. java.property.java.endorsed.dirs The endorsed dirs. See the Endorsed Standards Override Mechanism. java.property.java.ext.dirs The ext dirs, which are searched for jars that should be automatically put on the classpath. See the Java documentation for java.ext.dirs. java.property.java.home The root of the JDK or JRE installation. java.property.java.library.path The library path used to find user libraries. java.property.java.vm.version The JRockit version. java.rt.vmArgs The list of VM arguments. java.threads.daemon The number of running daemon threads. java.threads.live The total number of running threads. java.threads.livePeak The peak number of threads that has been running since JRockit was started. java.threads.nonDaemon The number of non-daemon threads running. java.threads.started The total number of threads started since the start of JRockit. jrockit.gc.latest.heapSize The current heap size in bytes. jrockit.gc.latest.nurserySize The current nursery size in bytes. jrockit.gc.latest.oc.compaction.time How long, in ticks, the last compaction lasted. Reset to 0 if compaction is skipped. jrockit.gc.latest.oc.heapUsedAfter Used heap at the end of the last OC, in bytes. jrockit.gc.latest.oc.heapUsedBefore Used heap at the start of the last OC, in bytes. jrockit.gc.latest.oc.number The number of OCs that have occurred so far. jrockit.gc.latest.oc.sumOfPauses The paused time for the last OC, in ticks. jrockit.gc.latest.oc.time The time the last OC took, in ticks. jrockit.gc.latest.yc.sumOfPauses The paused time for the last YC, in ticks. jrockit.gc.latest.yc.time The time the last YC took, in ticks. jrockit.gc.max.oc.individualPause The longest OC pause so far, in ticks. jrockit.gc.max.yc.individualPause The longest YC pause so far, in ticks. jrockit.gc.total.oc.compaction.externalAborted Number of aborted external compactions so far. jrockit.gc.total.oc.compaction.internalAborted Number of aborted internal compactions so far. jrockit.gc.total.oc.compaction.internalSkipped Number of skipped internal compactions so far. jrockit.gc.total.oc.compaction.time The total time spent doing compaction so far, in ticks. jrockit.gc.total.oc.ompaction.externalSkipped Number of skipped external compactions so far. jrockit.gc.total.oc.pauseTime The sum of all OC pause times so far, in ticks. jrockit.gc.total.oc.time The total time spent doing OC so far, in ticks. jrockit.gc.total.pageFaults The number of page faults that have occurred during GC so far. jrockit.gc.total.yc.pauseTime The sum of all YC pause times, in ticks. jrockit.gc.total.yc.promotedObjects The number of objects that all YCs have promoted. jrockit.gc.total.yc.promotedSize The total number of bytes that all YCs have promoted, in bytes. jrockit.gc.total.yc.time The total time spent doing YC, in ticks. oracle.ci.jit.count The number of methods JIT compiled. oracle.ci.jit.timeTotal The total time spent JIT compiling, in ticks. oracle.ci.opt.count The number of methods optimized. oracle.ci.opt.timeTotal The total time spent optimizing, in ticks. oracle.rt.counterFrequency Used to convert ticks values to seconds. Note that many of these counters are excellent choices for attributes to plot in the Management Console. Also note that many values are in ticks – to convert them to seconds, divide by the value in the oracle.rt.counterFrequency counter.

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Gparted resize of an extended partition fails with error "can't have overlapping partitions".

- by Marcus

I just decided to install Ubuntu 12.04 alongside Windows 7 on my Dell laptop. However I didn't do this manually but instead used the "Install Ubuntu alongside Windows 7" option during the installation. Now the partition that Ubuntu runs in has very little space and I am getting warning messages. I'm trying to use gparted 0.12.1-5 (via a live CD) to give Windows less space and give Ubuntu more. I've managed to remove 100GB from the Windows partition so I now have some unallocated space between Windows and Ubuntu. This is what it looks like inside Ubuntu (not using the live CD, since it won't let me mount a USB to save a screenshot): So first I take sda4 (extended?) and resize it to the left so it takes up all the unallocated space. Then I resize sda5 (ext4) as well so it takes up all the new space. However, when I hit apply, it fails on the first action (resizing sd4) with the error message can't have overlapping partitions. Any ideas as to why this happens? I also tried resizing sda4 by just a few MB so that it definitely didn't overlap anything, but I still got the same error message. To clarify, I am using gparted from the LiveCD, I just took the screenshot from Ubuntu. I couldn't attach the details file containing the error information from gparted because I can't mount a USB drive when I'm running from the LiveCD. I'm tried following the guide on the gparted website but it says Invalid argument or something like that. If the gparted details are needed, I may need some hints on how to solve the USB issue as well. :)

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Using the JRockit Flight Recorder as an In-Flight Black Box

- by Marcus Hirt

The new JRockit Flight Recorder has some very interesting properties. It can be used like the black box of an airplane, allowing users to go back in time and check what was happening around the time when something went wrong. Here is how to enable the default continuous recording in JRockit to allow for that use case. The flight recorder is on by default in JRockit R28, the problem is that there is no recording running by default. To configure JRockit to start with the default recording running, add the parameter: -XX:FlightRecorderOptions=defaultrecording=true That will enable a recording with recording ID 0. You can see that it has been started properly by choosing Show Recordings from the context menu in JRockit Mission Control. You should see something similar to the picture below. Simply right click on the recording and select dump to dump information available in the flight recorder. You can select to dump data for a specific period of time or all data. For more information about the command line parameters available to control the Flight Recorder, see the JRockit documentation.

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Doing Time Limited Flight Recordings Using Start Up Parameters

- by Marcus Hirt

Just like with the old JRockit Runtime Analyzer, it is possible to start up recordings using command line parameters to JRockit. The parameter is called -XX:StartFlightRecording in R28. Below is an example that starts a flight recording half a minute after the JVM has been started. The recording will last for a minute. The name when viewing the ongoing recordings will be MyRecording, and the resulting file will be written to C:\tmp\myrecording.jfr. The recording will use the settings in jre\lib\jfr\profile.jfs. -XX:StartFlightRecording=delay=30s,duration=60s,name=MyRecording,filename=C:\tmp\myrecording.jfr,settings=profile For more information, see the JRockit R28 command line parameter documentation.

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Can't get TRIM test to work

- by Matthew Marcus

So I'm attempting to install TRIM using the walkthrough here: How to enable TRIM? But everytime I attempt to run the hdparm command, I get the following when I try to run it w/ sda: reading sector 5805056: FAILED: Input/output error and I get this when running it with sda1: /dev/sda1: Device /dev/sda1 has non-zero LBA starting offset of 2048. Please use an absolute LBA with the /dev/ entry for the full device, rather than a partition name. /dev/sda1 is probably a partition of /dev/sda (?) The absolute LBA of sector 5807104 from /dev/sda1 should be 5809152 Aborting. I'm running Natty in a VBox on Windows 7. Someone PLEASE help.. I keep getting this "consistency check" message on boot of my machine and I think it's because Ubuntu is writing to the same sectors on the VHD too much.. need to get trim working on this thing.. Thanks.

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Ralink rt3090 driver installed and wireless doesn't work on Ubuntu 10.04

- by Marcus Rene

I have a LG A-410 lap-top (64 bits) with rt 3090 wireless card. Searching the problem I discover that I already have a rt 3090-dkms installed, but my wireless doesn't work. *-network UNCLAIMED description: Network controller product: RT3090 Wireless 802.11n 1T/1R PCIe vendor: RaLink physical id: 0 bus info: pci@0000:02:00.0 version: 00 width: 32 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: memory:e5400000-e540ffff

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The JRockit Book is Now in Print!

- by Marcus Hirt

Yes. I know. It’s been in print for some days already, but I haven’t found time to write about it until now. The book is a good guide for JVM’s in general, and for JRockit in particular. If you’ve ever wondered how the innards of the Java Virtual Machine works, or how to use the JRockit Mission Control to hunt down problems in your Java applications, this book is for you. The book is written for intermediate to advanced Java Developers. These are the chapters: Getting Started Adaptive Code Generation Adaptive Memory Management Threads and Synchronization Benchmarking and Tuning JRockit Mission Control The Management Console The Runtime Analyzer The Flight Recorder The Memory Leak Detector JRCMD Using the JRockit Management APIs JRockit Virtual Edition Appendix A: Bibliography Appendix B: Glossary Index The book is 588 pages long. For more information about the book, see the book page at Packt.

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EclipseCon 2011

- by Marcus Hirt

I sadly could not make it to EclipseCon last year. It was sad for so many reasons, not the least being that Sweden during that part of the year is cold and dark. ;) This year, however, I will be contributing two talks: ---> HotRockit – What to Expect from Oracle’s Converged JVM Oracle is converging the HotSpot and JRockit JVMs to produce a "best of breed JVM". Internally the project is sometimes referred to as the HotRockit project. There is already a large influx of ideas and solutions provided by the JRockit JVM into the Open JDK. Examples of improvements include: Better monitoring and profiling Improved performance Better ergonomics This talk will discuss what to expect from the converged JVM over the next two years, and how this will benefit the Eclipse community. Production-time Problem Solving in Eclipse This session will look at some common problems and pitfalls in Java applications. The focus will be on non-invasive profiling and diagnostics of running production systems. Problems tackled will be: Excessive GC Finding hotspots and optimizing them Optimizing the choice of data structures Synchronization problems Finding out where exceptions are thrown Finding memory leaks All problems will be demonstrated and solved running both the bad-behaving applications and the tools to analyze them from within the Eclipse Java IDE. <--- I hope to meet you there!

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Using the JRockit Flight Recorder as an Exception Profiler.

- by Marcus Hirt

There is a lot of new data points in the JRockit Flight Recorder compared to the data available in the old JRA. One set of data deals with exceptions and where they are thrown. In JRA, it was possible to tell how many exceptions were thrown, but it was not possible to determine from where they were thrown. Here is how to do a recording with exception profiling enabled from JRockit Mission Control. 1. Right click on the JVM to profile, select Start Flight Recording. 2. Select the Profiling with Exceptions template. 3. Wait for the recording to finish. The count down for the time left will show in the Flight Recorder Control view. 4. When done the recording will automatically be downloaded and displayed. To show the exceptions, go to the Code | Exceptions tab.

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scalablity of Scala over Java

- by Marcus

I read an article that says Scala handles concurrency better than Java. http://www.theserverside.com/feature/Solving-the-Scalability-Paradox-with-Scala-Clojure-and-Groovy ...the scalability limitation is confined specifically to the Java programming language itself, but it is not a limitation of the Java platform as a whole... The scalability issues with Java aren't a new revelation. In fact, plenty of work has been done to address these very issues, with two of the most successful projects being the programming languages named Scala and Clojure... ...Scala is finding ways around the problematic thread and locking paradigm of the Java language... How is this possible? Doesn't Scala use Java's core libraries which brings all the threading and locking issues from Java to Scala?

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Bug in firefox address bar autocomplete running on KDE

- by marcus

Has anyone experienced this graphical glitch when typing in Firefox address bar? The drop-down list is not drawn correctly, with some "blocks" missing. After typing more letters or hovering the mouse cursor, the list redraws itself and becomes complete. I'm running Ubuntu 12.04, Firefox 13.0.1 and this only happens in KDE (tested with 4.8.2, 4.8.3 and 4.8.4). It does not happen in Unity or Xfce with the same user profile. If I go to the KDE control panel and disable the Fade effect, the bug starts to happen to almost every menu in the system, including, the taskbar window previews. Enabling the “Fade” effect corrects the bug everywhere except in Firefox. I have an Nvidia card and I am using the proprietary driver (current, not current-updates -- not sure about the difference), but the linked question on an Arch Linux forum says this happen with the open source driver and with other cards too. Does anyone have an idea for a solution?

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