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• Fast lookup for organization hierarchy

  - by Élodie Petit

  I need a way to implement a fast lookup algorithm / system to find users very quickly in a multi-level department and multi-level employee/manager relation organization structure. Departments can have any level of departments and users directly connected to departments. User are connected to departments and other users at the same time. What would be the best approach to implement such a system? There will be approximately 2000 users and 30 departments. Is there a good way to hold all of this information on memory?

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• Are there any good Java/JVM libraries for my Expression Tree architecture?

  - by Snuggy

  My team and I are developing an enterprise-level application and I have devised an architecture for it that's best described as an "Expression Tree". The basic idea is that the leaf nodes of the tree are very simple expressions (perhaps simple values or strings). Nodes closer to the trunk will get more and more complex, taking the simpler nodes as their inputs and returning more complex results for their parents. Looking at it the other way, the application performs some task, and for this it creates a root expression. The root expression divides its input into smaller units and creates child expressions, which when evaluated it can use to build it's own result. The subdividing process continues until the simplest leaf nodes. There are two very important aspects of this architecture: It must be possible to manipulate nodes of the tree after it is built. The nodes may be given new input values to work with and any change in result for that node needs to be propagated back up the tree to the root node. The application must make best use of available processors and ultimately be scalable to other computers in a grid or in the cloud. Nodes in the tree will often be updating concurrently and notifying other interested nodes in the tree when they get a new value. Unfortunately, I'm not at liberty to discuss my actual application, but to aid understanding a little bit, you might imagine a kind of spreadsheet application being implemented with a similar architecture, where changes to cells in the table are propagated all over the place to other cells that need the result. The spreadsheet could get so massive that applying multi-core multi-computer distributed system to solve it would be of benefit. I've got my prototype "Expression Engine" working nicely on a single multi-core PC but I've started to run into a few concurrency issues (as expected because I haven't been taking too much care so far) so it's now time to start thinking about migrating the Engine to a more robust library, and that leads to a number of related questions: Is there any precedent for my "Expression Tree" architecture that I could research? What programming concepts should I consider. I realise this approach has many similarities to a functional programming style, and I'm already aware of the concepts of using futures and actors. Are there any others? Are there any languages or libraries that I should study? This question is inspired by my accidental discovery of Scala and the Akka library (which has good support for Actors, Futures, Distributed workloads etc.) and I'm wondering if there is anything else I should be looking at as well?

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• Oracle Solaris Cluster 4.1 Released

  - by Larry Wake

  Today we announced the release of Oracle Solaris Cluster 4.1 ( download ; existing customers can just update from the package repository ).New capabilities include:  Oracle Solaris 10 Zone Clusters: The easiest way to update and consolidate existing Solaris 10 application environments is with Oracle Solaris 10 Zones within Oracle Solaris 11 -- not only do you get higher system utilization, but you can immediately leverage new features such as network virtualization.With Oracle Solaris Cluster 4.1, you can now cluster these zones, for even higher availability. Expanded disaster recovery operations: Oracle Solaris Cluster 4.1 introduces managed switchover and disaster-recovery takeover of applications and data using ZFS Storage Appliance replication services in a multi-site, multi-cluster configuration. Faster application recovery with improved storage failure detection and resource dependency management. Labeled security support for providing both high availability and high security, leveraging Oracle Solaris 11 Trusted Extensions. Learn more: Oracle Solaris Cluster at the Oracle Technology Network Data Sheet  What's New in Oracle Solaris Cluster 4.1  FAQs

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• ERROR_PROCEDURE Does Not Return a Schema Name

  "A recent blog entry I read reminded me again that I wanted to rant about an issue in SQL Server for quite some time now. SQL Server 2005 introduced the separation between user and schema. Though schemata already existed before SQL Server 2005, they really became usable with this version, imho. At the same time TRY...CATCH was a new way for structured error handling introduced. And so it finally became possible…" NEW! SQL Monitor 2.0Monitor SQL Server Central's servers withRed Gate's new SQL Monitor.No installation required. Find out more.

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• SSRS Report Parts Versus Sub Reports FAQ

  I'm trying to decide on a development strategy to satisfy the reporting needs in my organization. I would like to increase our efficiency in responding to report requests, while minimizing our maintenance burden. Two topics that I would like to dig in to are Report Parts and Subreports. Can you provide some considerations for using one versus the other? NEW! SQL Monitor 2.0Monitor SQL Server Central's servers withRed Gate's new SQL Monitor.No installation required. Find out more.

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• Just installed 12.10 with WUBI and get error

  - by John

  Goes to the terminal screen and says: [drm:drm_crtc_helper_set_config] ERROR failed to set mode on 'crtc:10] From what I gather, this is an issue with my monitor. Not sure. I am really new to this. I have a Compaq Presario running XP SP3 and am using a Sony Bravia 32" LCD TV as a monitor. Downloaded Ubuntu from, well,... Ubuntu. Used WUBI to install. I suppose it created its own partition because install never asked. Is there a work-around for this? I have tried everything I know of, given my very limited experience. Thanks in advance.

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• Uninstalling a SQL Server Clustered Instance

  I have installed and uninstalled several instances of SQL Server in the past. Today, I need to uninstall a SQL Server 2008 R2 clustered instance. I have never uninstalled a clustered instance of SQL Server before. Can you provide a how-to guide to uninstall a clustered instance of SQL Server 2008 R2? NEW! SQL Monitor 2.0Monitor SQL Server Central's servers withRed Gate's new SQL Monitor.No installation required. Find out more.

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• Getting trayer to work with dual screen setup

  - by Ikke

  I'm using XMonad as my window manager, and want to use trayer as a icon panel for things like nm-applet. The problem was that the panel wouldn't appear on the top of the screen. If I set it to the bottom it just appeared. After a lot of trying, I found out it is because my xorg.conf is setup for dualscreens, and probably the trayer panel is spawned outside my view (I currently have only a single screen, but I switch a lot). After manualy tweaking the xorg.conf file to allow for just one screen, the panel appears on the right spot. These are the things I had to modify: Section "Monitor" Identifier "0-LVDS" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" Option "PreferredMode" "1366x768" Option "TargetRefresh" "60" Option "Position" "0 0" # Was 1280 256 Option "Rotate" "normal" Option "Disable" "false" EndSection SubSection "Display" Viewport 0 0 Virtual 1366 768 # Was 2646 2646 Depth 24 EndSubSection The problem is ofcourse that I can't use my dual screen setup anymore. Is there a way to force trayer on the right position even with the dualscreen setup?

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• App Engine charges in November 2011 [closed]

  - by broiyan

  I had a billing enabled test application on Google App Engine left over from early 2011. I have not received a bill in many months because I have not been hitting the URL and according to the activity monitor, nobody has. Then unexpectedly in November 2011, I received 2 bills in as many weeks for quite minimal amounts. Checking the monitor it looks like nobody has been hitting the URL and according to the SQL-like search, there is nothing in the Datastore. I know that GAE has left the "preview" in recent weeks but I am not sure how that would affect what is essentially a dormant application with no Datastore objects. Has GAE started charging for completely unused applications in recent weeks? Edit: Most of my applications were already disabled and I have just disabled the only one that was enabled but unused the past several months. If I get another bill next week that should be informative.

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• Shared memory multiprocesses

  - by poly

  I'm building an multi processes application and I need to save session ID, the sessions ID is 32 bit, and of course it can't be used twice in its lifetime, I'm currently using DB that saves all the ID in a table, and I do the following, ID table is (int key, char used(1)) //1 is used, 0 is not 1. lock table 2. get one key for one sessions 3. update used field in it to used 4. unlock After the session is finished the process use below to free key, 1. lock table 2. update used field in it to not used 4. unlock I'm really wondering whether this is a good/fast implementation. and please note it's multi processes application.

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• Pillar Axiom OpenWorld Highlights

  - by uwes

  During the Storage General Session at Oracle OpenWorld Conference 2012 in San Francisco, the following Axiom-related announcements were made: Oracle Platinum Services for Axiom 600: Extending Oracle's Platinum Services to Axiom 600 as a standalone product –  the same level of service and support you get with Exadata – 24/7 fault monitoring, dedicated response and escalation management to meet enterprise-grade SLA’s, patch planning and management. Oracle Enterprise Manager Axiom Plug-in: Allowing DBA's to manage, maintain, monitor and provision the Axiom 600 storage system from Oracle EM. Oracle Virtual Machine Axiom Plug-in: Allowing Oracle VM and System Administrators to manage, maintain, monitor and provision the Axiom 600 storage system from Oracle VM using Storage Connect. Oracle Axiom Data Protection Manager 3.1: Leveraging Axiom's Copy Services, System Administrators can automatically create Application Consistent Clones of critical Windows and Oracle DataBase environments for quick recovery. For More Information Go To: Oracle.com Pillar Axiom Page Oracle Technology Network SAN Page

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• Light Weight Monitoring using Extended Events

  Extended events provide DBAs with a new lightweight tool to monitor SQL Server performance.

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• Massive vehicular network simulator

  - by IvanK

  I am interested in making a vehicular network simulator (vehicular network as in vehicles can be equipped with radios and when they come in range they can talk with each other). I want to be able to scale to 1000s of nodes if not more. I am quite frankly torn on how to do, or even which language to use or whether I should instead be using some other piece of software/code. I know that this should depend on a lot of design decisions that I may have, but it would be great if somebody can point me towards the right direction. I was planning to use a multi-threaded architecture, but not sure whether it will add to the complication or make it easier. Also if I go for a multi-threaded architecutre, do you think that 'Go' language will be a good choice?

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• enable iptables firewall on linux

  - by user13278061

   Here is a very basic set of instruction to setup a simple iptables firewall configuration on linux (redhat) Enable firewall log as root thenenter the following command, it launch a text gui #> setup first screen: Choose firewall configuration second screen: choose "Enabled" then "Customize" third screen: select you interface in "Trusted Devices", select "Allow Incoming" for "SSH" "Telnet" "FTP" (add eventually other ports, then press "OK" (2 times, then "Quit") At that point the firewall is enabled. You can start/stop/monitor using service iptables start/stop/status Change timeout to changed the tcp established connection timeout #> echo 120 >    /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_established Monitor connection in iptables tables for example if you want to track a connection establish from a host  152.68.65.207 #> cat /proc/net/ip_conntrack |grep 152.68.65.207

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• Usb/vga not recognized anymore

  - by Peter Raeves

  I don't know what happened, but yesterday everything worked fine, but when I woke up this morning and booted my computer to Ubuntu 14.04 a bunch of hardware isn't recognized anymore. I use a dual monitor setup with dvi-d and vga, but the vga screen isn't recognized anymore and the dvi-d monitor is recognized as "Built-in Display" while I'm not on a laptop. Also every device connected through usb isn't recognized anymore either. I have a keyboard with the blue round connector, which still works, so I can still log in though. The computer goes slower than usual and I have no idea what has happened. Can anybody point me in the direction I should start looking, because this is scary! I just checked and both the front and back sound connectors stopped working also :/ Edit: The devices connected through USB are recognized as they all show up using sudo lsusb, Ubuntu just doesn't let me use them anymore.

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• Hitachi Data Systems definition of cloud

  - by llaszews

  1. Ability to rapidly provision and de-provision a service. (aka: provisioning) 2. A consumption model where users pay for what they use. (aka: chargeback and showback) 3. The agility to flexibly scale - 'flex up' or 'flex down' - the services without extensive pre-planning. (aka: elasticity) 4. Secure, direct connection to the cloud without having to recode applications (aka: internet-based) 5. Multi-tenancy capabilitites that segregate and protect the data. (as it says multi-tenancy) Happen to be I have been talking about 4 of the 5. Did not mention connection to internet as assumed this.

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• How to set up multiple GPUs (12.04)?

  - by Brother Erryn

  I have two GPUs: one Intel i915 integrated, and one NVIDIA 560 Ti. This is NOT a hybrid setup, nor a laptop. In Windows 7, each card is connected to a different monitor, with the NVIDIA doing any "heavy lifting". For the life of me I cannot get Ubuntu to recognize the i915, but when logging off or rebooting, the shutdown actually appears on the i915. lshw lists both. I'm running the "current" NVIDIA drivers (not the experimental), but Displays calls its monitor a "Laptop". Is this even possible under Ubuntu? The only things that even looked like potential solutions were for laptop hybrid setups and used Bumblebee, but that doesn't seem to apply here.

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• See how one goal leads to another (i.e., how often downloading the demo leads to purchasing)

  - by s3cur3

  I have two goals set up for my site in Google Analytics: one to download the demo of my software, and the other to buy the full version. I'm having trouble getting statistics on how often the download leads to a purchase. This seems like something the multi-channel funnel is perfect for (as in this question)---I expect that it takes multiple visits for the demo download to convert into an order. However, I can't seem to narrow down the multi-channel funnel data into only those that have one goal followed by another. If it matters, I'm tracking the ordering action as a page view (i.e., someone views the "Thanks for ordering" page) and the demo download as an action (which fires when someone clicks the "download" button). Thanks! - Tyler

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• 12.04 + Alienware M11x R2 + Bumblebee 3.0 = low resolution only

  - by user89171

  I had a fresh install of Ubuntu 12.04 on my Alienware M11x, and it worked with the native monitor resolution of 1366x768. In trying to get the Optimus chipset working, I installed Bumblebee 3.0. Now, I am only offered 640x480 for my monitor resolution. Graphically, Unity 3D appears to be working now, instead of the Unity 2D I had before, so something went right, but I don't know how I can get it to offer me any higher resolutions than 640x480. I've looked up many pages that address this topic, but nothing that I've seen suggested has worked. sudo add-apt-repository ppa:bumblebee/stable sudo apt-get update sudo apt-get install bumblebee-nvidia was the latest thing I tried. I've tried some variants of this, I've been sure to uninstall nvidia drivers prior to reinstalling Bumblebee and various video drivers. Does anyone have any clue as to how I can get back to native resolution?

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• Oracle Transportation Management 6 Essentials (1Z1-578) Certified Implementation Exam Is Available In Beta

  - by swalker

  The Oracle Transportation Management 6 Essentials (1Z1-578) exam beta, available until December 23, is designed for individuals who possess a strong foundation and expertise in selling or implementing Oracle Transportation Management solutions. This certification exam covers topics such as OTM Core Functionality and Shipment Planning Overview, Fleet Management and Payment, Agents, Multi-Legs, Multi-Stops and Workflows. Up-to-date training and field experience are recommended. The Oracle Transportation Management Implementation Specialist certification recognizes OPN members as OPN Certified Specialists. This certification differentiates OPN members in the marketplace by providing a competitive edge through proven expertise, and helps the OPN member's partner organization qualify for the Oracle Transportation Management Specialization. Take advantage of a free exam now and send your request for a beta exam voucher to [email protected].

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• Handling Backups for Rapid Resilience

  The backup and restore system in SQL Server hasn't changed a great deal over the years despite a huge growth in the typical size of databases. When disaster strikes, and an important service is taken offline while a restore is performed, there is often time to reflect on whether it might be possible to design databases for a more rapid recovery of the most critical parts of a database application. Uncover the flexibility of custom metricsKeep up to date from anywhere with SQL Monitor, and monitor the most important data for your servers and applications. Download a free trial.

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• Dual screens with one workspace on each?

  - by user2413

  Hi all, I have a dual screen, compiz-fusion and i don't have a NVDIA/ATI graphic card and i use ubuntu 10.10. i currently use the two monitors: the desktop is stretched across monitors and i can drag an application across monitors. My question follows: i would like to use the left monitor only to display workspace1 and the right monitor to display workspace2. Is this possible ? If yes how (I've found mention of dualXscreen on this board, but i can't find it in the compizConfig menus). Best,

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• Silverlight Connections - Vegas Nov 1-4

  got asked to speak at SilverlightConnections in Vegas in Nov. :) topics include: 'Breaking Down Walls The Story of Getting designers and developers working together in an Agency Environment' and 'Multi Dos and Dont touches Multi Touch Development from the trenches' and 'Going from Silverlight to Phone 7 Silverlight Application Development'http://www.devconnections.com/shows/FALL2010ASP/default.asp?s=151 Title: Breaking Down Walls The Story of Getting designers and developers working together in...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Dual screen with JUST extended desktop

  - by c001os

  Im using a dual monitor set-up a lot, but i have a problem. I need to forbid to clone the dektop, i want to use just the extended desktop feature. Can it be done somehow? It's a problem because, when is start my system with two monitor it starts automaticaly with cloned desktop. When i use the hotkey to switch beatween monitors the same problem occours. Always going to the screen resolution options is pain in the *. I have a intel hd3000 videocard (sandy bridge) Thanx a lot

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• Pidgin (Formerly Gaim)

  An open source, multi-protocol IM client that supports AIM, ICQ, MSN Messenger, Yahoo!, IRC, Jabber, and more

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