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• Database Insider - June 2014 issue now available

  - by Javier Puerta

  The June issue of the Database Insider newsletter is now available. (Full newsletter here) NEWS June 10: Oracle CEO Larry Ellison Live on the Future of Database Performance At a live webcast on June 10 at Oracle’s headquarters, Oracle CEO Larry Ellison is expected to announce the upcoming availability of Oracle Database In-Memory, which dramatically accelerates business decision-making by processing analytical queries in memory without requiring any changes to existing applications.Read More New Study Confirms Capital Expenditure Savings with Oracle Multitenant A new study finds that Oracle Multitenant, an option of Oracle Database 12c, drives significant savings in capital expenditures by enabling the consolidation of a large number of databases on the same number or fewer hardware resources.  Read More Read full newsletter here

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• Writing OLAP SQL query

  - by user1859596

  I have a project I am working on that requires the following : create a normalized sample rdbms (5 tables) using Java I entered 1 million rows of data to each table run two OLTP and two OLAP queries on the normalized tables. Denormalized tables. run the same OLTP and OLAP queries on them and compare time. What does OLAP query mean? I've searched the internet and all that I can find is that I have to make a cube, and apply queries on it. How can I write an OLAP query on a RDBMS? I have a sample : tables normalized(orders,product,customer,branch,sales) sales : order_id,product_id,quantity product : product_id,name,description,price,sales_tax customer : customer_id,f_name,l_name,tel_no,addr,nic,city branch : branch_id,name,tel_no,addr,city orders : order_id,customer_id,order_date,branch_id I want to write an OLAP query on the above tables. I am using Oracle Express with SQL Developer.

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• Configuring MySQL Cluster Data Nodes

  - by Mat Keep

  0 0 1 692 3948 Homework 32 9 4631 14.0 Normal 0 false false false EN-US JA X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:Cambria; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin; mso-ansi-language:EN-US;} In my previous blog post, I discussed the enhanced performance and scalability delivered by extensions to the multi-threaded data nodes in MySQL Cluster 7.2. In this post, I’ll share best practices on the configuration of data nodes to achieve optimum performance on the latest generations of multi-core, multi-thread CPU designs. Configuring the Data Nodes The configuration of data node threads can be managed in two ways via the config.ini file: - Simply set MaxNoOfExecutionThreads to the appropriate number of threads to be run in the data node, based on the number of threads presented by the processors used in the host or VM. - Use the new ThreadConfig variable that enables users to configure both the number of each thread type to use and also which CPUs to bind them too. The flexible configuration afforded by the multi-threaded data node enhancements means that it is possible to optimise data nodes to use anything from a single CPU/thread up to a 48 CPU/thread server. Co-locating the MySQL Server with a single data node can fully utilize servers with 64 – 80 CPU/threads. It is also possible to co-locate multiple data nodes per server, but this is now only required for very large servers with 4+ CPU sockets dense multi-core processors. 24 Threads and Beyond! An example of how to make best use of a 24 CPU/thread server box is to configure the following: - 8 ldm threads - 4 tc threads - 3 recv threads - 3 send threads - 1 rep thread for asynchronous replication. Each of those threads should be bound to a CPU. It is possible to bind the main thread (schema management domain) and the IO threads to the same CPU in most installations. In the configuration above, we have bound threads to 20 different CPUs. We should also protect these 20 CPUs from interrupts by using the IRQBALANCE_BANNED_CPUS configuration variable in /etc/sysconfig/irqbalance and setting it to 0x0FFFFF. The reason for doing this is that MySQL Cluster generates a lot of interrupt and OS kernel processing, and so it is recommended to separate activity across CPUs to ensure conflicts with the MySQL Cluster threads are eliminated. When booting a Linux kernel it is also possible to provide an option isolcpus=0-19 in grub.conf. The result is that the Linux scheduler won't use these CPUs for any task. Only by using CPU affinity syscalls can a process be made to run on those CPUs. By using this approach, together with binding MySQL Cluster threads to specific CPUs and banning CPUs IRQ processing on these tasks, a very stable performance environment is created for a MySQL Cluster data node. On a 32 CPU/Thread server: - Increase the number of ldm threads to 12 - Increase tc threads to 6 - Provide 2 more CPUs for the OS and interrupts. - The number of send and receive threads should, in most cases, still be sufficient. On a 40 CPU/Thread server, increase ldm threads to 16, tc threads to 8 and increment send and receive threads to 4. On a 48 CPU/Thread server it is possible to optimize further by using: - 12 tc threads - 2 more CPUs for the OS and interrupts - Avoid using IO threads and main thread on same CPU - Add 1 more receive thread. Summary As both this and the previous post seek to demonstrate, the multi-threaded data node extensions not only serve to increase performance of MySQL Cluster, they also enable users to achieve significantly improved levels of utilization from current and future generations of massively multi-core, multi-thread processor designs. A big thanks to Mikael Ronstrom, Senior MySQL Architect at Oracle, for his work in developing these enhancements and best practices. You can download MySQL Cluster 7.2 today and try out all of these enhancements. The Getting Started guides are an invaluable aid to quickly building a Proof of Concept Don’t forget to check out the MySQL Cluster 7.2 New Features whitepaper to discover everything that is new in the latest GA release

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• Reminder: Free, Global, Virtual Developer Day November 5th

  - by jeckels

  Just a quick reminder about the FREE virtual developer day focused on Coherence (and WebLogic) coming on November 5th. This day, with content tailored for developers, will guide you through tooling updates and best practices around creating applications with WebLogic and Coherence as target platforms. We'll also explore advances in how you can manage your build, deploy and ongoing management processes to streamline your application's life cycle. And of course, we'll conclude with some hands-on labs that ensure this isn't all a bunch of made-up stuff - get your hands dirty in the code!November 5, 20139am PT/12pm ETREGISTER NOW We're offering two tracks for your attendance, though of course you're free to attend any session you wish. The first will be for pure developers with sessions around developing for WebLogic with HTML5, processing live events with Coherence, and looking at development tooling. The second is for developers who are involved in the building and management processes as part of the application life cycle. These sessions focus on using Maven for builds, using Chef and Puppet for configuration and more.We look forward to seeing you there - don't forget to invite a friend!

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• Speaking in Omaha: December 7, 2011

  - by Bill Graziano

  I’m presenting in Omaha on Writing Faster SQL at 6PM on December 7th.  You can find meeting details on the Omaha SQL Server User Group page. The meeting location requires an RSVP so building security has a list of attendees. The presentation is a series of suggestions on improving performance.  It ranges from simple things like comparing indexed columns to scalar values up to tips for reducing query compiles and asynchronous processing patterns.  Nearly all of these come from specific issues I’ve encountered working on poorly performing SQL Servers.

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• Showing "Failed" for a SharePoint 2010 Timer Job Status

  - by Damon

  I have been working with a bunch of custom timer jobs for last month.  Basically, I'm processing a bunch of SharePoint items from the timer job and since I don't want the job failing because of an error on one item, so I'm handing errors on an item-by-item basis and just continuing on with the next item.  The net result of this, I soon found, is that my timer job actually says it ran successfully even if every single item fails.  So I figured I would just set the "Failed" status on the timer job is anything went wrong so an administrator could see that not all was well. However, I quickly found that there is no way to set a timer job status.  If you want the status to show up as "Failed" then the only way to do it is to throw an exception.  In my case, I just used a flag to store whether or not an error had occurred, and if so the the timer job throws a an exception just before existing to let the status display correctly.

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• dpkg reports error on package icaclient

  - by Photonics1

  I installed the icaclient (it's a client for Citrix) a while back. I don't exactly remember what I did to get it working but it was enervating. I had to install some old packages not even avaiable for ubuntu (12.04) and in the end I used some stuff from old rpms. Anyway the client is more or less working now but I always get a dpkg error when installing or updating something. The (translated) error message is something like: dpkg: Error while processing icaclient:i386 (--configure): subprocess installed post-installation-script return errorcode 2 I just want to tell dpkg to ignore this or remove this post-install-script but I don't know how. Thanks!

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• Is there a quick way to convert camera raw files to DNG?

  - by dericke

  Before I switched from Windows to Ubuntu for my daily computing, I used Adobe's Photoshop Lightroom for processing photos from my DSLR. Adobe made it really straightforward to convert from proprietary camera raw files (in my case, .NEF) to DNG. I haven't found any way to convert NEF to DNG in Ubuntu yet. Most photography programs do process NEFs to JPG/TIFF/PNG/etc., but I'm looking for a converter for archival purposes. Are there any tools available, either standalone or built into another app, that can losslessly convert from NEF to DNG?

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• DRY, string, and unit testing

  - by Rodrigue

  I have a recurring question when writing unit tests for code that involves constant string values. Let's take an example of a method/function that does some processing and returns a string containing a pre-defined constant. In python, that would be something like: STRING_TEMPLATE = "/some/constant/string/with/%s/that/needs/interpolation/" def process(some_param): # We do some meaningful work that gives us a value result = _some_meaningful_action() return STRING_TEMPLATE % result If I want to unit test process, one of my tests will check the return value. This is where I wonder what the best solution is. In my unit test, I can: apply DRY and use the already defined constant repeat myself and rewrite the entire string def test_foo_should_return_correct_url(): string_result = process() # Applying DRY and using the already defined constant assert STRING_TEMPLATE % "1234" == string_result # Repeating myself, repeating myself assert "/some/constant/string/with/1234/that/needs/interpolation/" == url The advantage I see in the former is that my test will break if I put the wrong string value in my constant. The inconvenient is that I may be rewriting the same string over and over again across different unit tests.

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• How to create a simple side scroller game

  - by D34thSt4lker

  I'm still pretty new to game programming and any tutorial that I have worked with stuck to only games with the initial screen. I want to start creating my own games but there are a few things that I still need to learn. One of them is how to create a game that side-scrolls. For example; Mario... Or ANY type of game like that... Can anyone give me a small example to create something like that. I'm not asking for any specific language because currently in school I am learning javascript but I know some c++/java/processing/objective-c as well. So any of those languages would be fine and I could probably implement it in any of the others... I have been searching for some help with this for a while now but could never actually get any help on it. Thanks in advance!

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• READ_ME_FIRST: What Do I Do All of Those SPARC Threads?

  - by user12608550

  New Oracle Technical White Paper: READ_ME_FIRST: What Do I Do All of Those SPARC Threads? Executive Overview With an amazing 1,536 threads in an Oracle M5-32 system, the number of threads in a single system has never been so high. This offers a tremendous processing capacity, but one may wonder how to make optimal use of all these resources. In this technical white paper, we explain how the heavily threaded Oracle T5 and M5 servers can be deployed to efficiently consolidate and manage workloads using virtualization through Oracle Solaris Zones, Oracle VM Server for SPARC, and Oracle Enterprise Manager Ops Center, as well as how to improve the performance of a single application through multi-threading. READ_ME_FIRST: What Do I Do All of Those SPARC Threads?

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• How can I designed multi-threaded application for larger user base

  - by rokonoid

  Here's my scenario, I need to develop a scalable application. My user base may be over 100K, every user has 10 or more small tasks. Tasks check every minute with a third party application through web services, retrieving data which is written in the database, then the data is forwarded to it's original destination. So here's the processing of a small task: while(true){ Boolean isNewInformationAvailable = checkWhetherInformationIsAvailableOrNot(); If(isNewInformationAvailable ==true){ fetchTheData(); writeToDatabase(); findTheDestination(); deliverTheData(); isAvailable =false; } } Here is the question: as the application is large, how should I approach designing this. I'm going to use Java to write it. Should I use concurrency, and how would you manage the concurrency?

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• Bug? Flash of white when changing orientation on iOS Safari [migrated]

  - by Baumr

  What causes the flash of white to the right of a responsive design when changing orientation from portrait to landscape on iOS? Try it on iOS6 Safari: Websites like this don't do it: http://html5boilerplate.com But this one does: http://www.initializr.com Something to do with re-processing (CPU lag) to fit a wider screen? It doesn't happen in Chrome for iOS6... Update: I just removed all img and from my testing site, but it still happens. This seems to happen with a lot of different websites out there. Is it a bug with their code, or a Safari for iOS bug? Others are completely immune to it...

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• /dev/sda1 100% Mysql to blame?

  - by SJP

  I have a an API running that receives raw binaries, processes them, and then stores metadata about the bins in a mysql database. I have been running it for a couple days on a VM. Today the API stopped processing the mySQL commands. After using the command df-h the results were: root@mwdb1:/# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 104G 99G 0 100% / udev 16G 4.0K 16G 1% /dev tmpfs 6.3G 364K 6.3G 1% /run none 5.0M 0 5.0M 0% /run/lock none 16G 0 16G 0% /run/shm /dev/sdb1 5.5T 42G 5.2T 1% /data sda1 is at 100%

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• Are VM-based languages becoming viable for Graphics since the move to GPU computing?

  - by skiwi

  Perhaps the title is not the most clear, so let me elaborate it more: I am talking about VM-based languages, by that I mean languages that run on the JVM (java) and for example C#. Also I am talking about 3D graphics, just to be clear. Lately the trend has been that most computing is being done on the GPU and not on the CPU, and since times the issue with programming games on a VM-based language is that garbage collecting may happen randomly. So let's take a look which is responsible for what: Showing the graphics: GPU Uploading graphics to the GPU: CPU? Needs to be done every frame? Calculating physics constraints: GPU Doing the real game logic (Determining when to move objects (independent of physics calculations), processing AI): CPU Is my list actually correct? And if it is, is for example Java becoming more viable? Or is uploading the graphics (vertices) still the most expensive operation? Would like to get more insight into this.

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• Hadoop:Only master node does the work

  - by user287722

  I've setup a Hadoop 2.2 cluster with 1 master node(namenode and secondary namenode) and 3 slave nodes(datanode and namenode on each one).All of the machines use Linux Mint 64bit. When I run my MapReduce program, writen in Java, I can only see that master node is using extra CPU and RAM. Slave nodes are not doing a thing. I've checked the logs from all of the namenodes and there is nothing wrong with the namenodes on slave nodes. Resource Manager is running and all of the slave nodes can see the Resource Manager. I used this http://n0where.net/hadoop-2-2-multi-node-cluster-setup/ tutorial to configure my nodes. Datanodes are working in terms of distributed data storing but I can't see any indication of distributed data processing. Do I have to configure the xml configuration files in some other way so all of the machines will process data while I'm running my MapReduce Job?

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• How long till HTML5 canvas becomes a viable game development platform?

  - by Shouvik

  So I have been working on web application. So invariably what it boils down to is making simple games which were previously based on flash or openGL. Now I know apple was moving away from flash because its proprietary unlike their stance that its got "pathetic performance"! Not true, try playing a canvas game, I can assure you at any point of time (including when its idle) it will use up a fair bit of processing power just to redraw the UI. Now I do understand that this is my fault because when the game is not active I should not be redrawing the canvas, but honestly its a lot of work and I suppose there should be libraries which should be able to assist me with that! So, how much will it be before I see a decent canvas library which handles these "tiny" issues for me? I can't honestly expect Steve Jobs to be doing anything more for HTML5! I someone knows of a good library, I am all ears...! :) PS: I use mootools and am presently using Mootools Canvas Library.

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• FBO rendering different result between Galaxy S2 and S3

  - by BruceJones

  I'm working on a pong game and have recently set up FBO rendering so that I can apply some post-processing shaders. This proceeds as so: Bind texture A to framebuffer Draw balls Bind texture B to framebuffer Draw texture A using fade shader on fullscreen quad Bind screen to framebuffer Draw texture B using normal textured quad shader Neither texture A or B are cleared at any point, this way the balls leave trails on screen, see below for the fade shader. Fade Shader private final String fragmentShaderCode = "precision highp float;" + "uniform sampler2D u_Texture;" + "varying vec2 v_TexCoordinate;" + "vec4 color;" + "void main(void)" + "{" + " color = texture2D(u_Texture, v_TexCoordinate);" + " color.a *= 0.8;" + " gl_FragColor = color;" + "}"; This works fine with the Samsung Galaxy S3/ Note2, but cause a strange effect doesnt work on Galaxy S2 or Note1. See pictures: Galaxy S3/Note2 Galaxy S3/Note2 Galaxy S2/Note Galaxy S2/Note Can anyone explain the difference?

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• Can't upgrade 11.04: flashplugin-nonfree: Package is in very bad, inconsistent state

  - by Ondra Žižka

  I can't upgrade from 11.04. I've disabled all apt sources, but still I get: http://img715.imageshack.us/img715/6680/snmekobrazovkyg.png The only option I am capable doing is to format and reinstall whole system, which I don't prefer as I have tuned a lot of apps settings, etc. How can I fix this? Update: After restart, when trying to update all packages, I get this error: installArchives() failed: dpkg: error processing flashplugin-nonfree (--remove): Package is in very bad, inconsistent state - before trying to remove rather reinstall it. Reinstalling it results in the same error.

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• Ruby: if statement using regexp and boolean operator [migrated]

  - by bev

  I'm learning Ruby and have failed to make a compound 'if' statement work. Here's my code (hopefully self explanatory) commentline = Regexp.new('^;;') blankline = Regexp.new('^(\s*)$') if (line !~ commentline || line !~ blankline) puts line end the variable 'line' is gotten from reading the following file: ;; alias filename backupDir Prog_i Prog_i.rb ./store Prog_ii Prog_ii.rb ./store This fails and I'm not sure why. Basically I want the comment lines and blank lines to be ignored during the processing of the lines in the file. Thanks for your help.

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• Installing g77 in Ubuntu 12.04 LTS (32bit)

  - by pksahani

  I am using Ubuntu 12.04 LTS (32bit-i386) in my desktop PC. I need g77 compiler for some specific applications. The app can only be installed after having g77 compiler. This specific app is designed based on g77 fortran compiler and can't be used with gfortran which is the standard available compiler in 12.04 LTS. And guide me the procedure to install g77 in 12.04. I have been trying apt-get update & apt-get install g77 after changing the sources.list file. After processing I am able to install g77 but when i try to compile a fortran program, it shows error /usr/bin/ld: cannot find crt1.o: No such file or directory /usr/bin/ld: cannot find crti.o: No such file or directory /usr/bin/ld: cannot find -lgcc_s collect2: ld returned 1 exit status Please help me. I m struggling a lot to fix this.

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• Temenos WealthManager: performance benchmark on Exadata

  - by Javier Puerta

  Temenos WealthManager is at work in financial institutions of all sizes. No matter the size, each of Temenos’ customers has one requirement in common: a need for fast technology. This led Temenos to conduct a performance benchmark, running its WealthManager platform on Oracle Exadata Database Machine. During the study, Temenos executed high-intensity financial engines two- to three-times faster than its previous internal benchmarks and/or largest customer throughput. The company also demonstrated greater than two-times the average improvement in response times for six-times the number of users and data volumes. Further, Temenos secured a two-times gain in service-level agreements for batch and user-oriented workloads via dedicated or parallelized processing windows. Last year Temenos also communicated the availability of its T24 core banking system and how the benchmark run demonstrated the ability of Oracle’s Exadata platform to comfortably support the highest banking volumes for T24. Read full story here  

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• Tell the CDI 2 Expert Group What You Think!

  - by reza_rahman

  Since it's introduction in Java EE 6, CDI has become a key API for the platform. CDI 1.1 was a relatively minor release included in Java EE 7 as was CDI 1.2 (to be included in GlassFish 4.0.1). We have much higher expectations from CDI 2 (projected to be included in Java EE 8) under the new leadership of Antoine Sabot-Durand. Much like we conducted the Java EE 8 survey to solidify future direction for the platform, CDI 2 is now undergoing the same effort. Towards this goal the CDI 2 leadership is now soliciting feedback on some very specific items via an open survey. Topics include the likes of Java SE bootstrap, asynchronous processing, modularity, EJB-style @Startup and @Asynchronous in CDI, configuration and CDI Lite. You can of course also provide free-form input on anything that's not on the survey. Take the survey now on the CDI specification site and help shape the future of CDI 2 and Java EE 8!

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• HTTP resource bundling/streaming practice

  - by icelava

  Our SPA (plain HTML and Javascript) makes use of huge volume of javascript and other resources that are downloaded via XHR. Given the sheer number of components and browser simultaneous request limits, we're thinking for ways to deliver our resources in a more efficient manner. A method we're considering is bundling several resources that logically form a coherent group into a single file; thus reducing down to only one XHR (per group). Furthermore to make it more responsive, we'd like to constantly inspect the partial responseText during the LOADING state, determining if a usable chunk (atomic resource) has already been downloaded, and make it available for deserialization/processing even before the XHR is DONE. (a stream-like experience) We're thinking surely somebody else would've considered roughly the same approach before, but haven't really come across any library/framework or container file format that is suitable for our scenario. Anybody else know of something similar?

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• Jersey 2.0 Milestone 2 Now Available

  - by arungupta

  Jersey 2.0 milestone 2 is now available. It builds upon the first milestone and adds several new features such as server-side asynchronous processing, server-side content negotiation, improved JAX-RS parameter injection, and several others. The REST endpoints can be published on Java SE HTTP Server, Grizzly 2 HTTP container, and some basic Servlet-based deployments. It also provides HTTPURLConnection-based client API implementation. Read about these and more about what's new in Marek's detailed post. Of course this is also the future reference implementation for JAX-RS 2.0. Feel like trying it out? Simply go to Maven Central (of course none of this is production quality at this point). The latest JAX-RS Javadocs and Jersey 2.0 API docs are good starting points to explore. And provide them feedback at [email protected].

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