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• Building dynamic OLAP data marts on-the-fly

  - by DrJohn

  At the forthcoming SQLBits conference, I will be presenting a session on how to dynamically build an OLAP data mart on-the-fly. This blog entry is intended to clarify exactly what I mean by an OLAP data mart, why you may need to build them on-the-fly and finally outline the steps needed to build them dynamically. In subsequent blog entries, I will present exactly how to implement some of the techniques involved. What is an OLAP data mart? In data warehousing parlance, a data mart is a subset of the overall corporate data provided to business users to meet specific business needs. Of course, the term does not specify the technology involved, so I coined the term "OLAP data mart" to identify a subset of data which is delivered in the form of an OLAP cube which may be accompanied by the relational database upon which it was built. To clarify, the relational database is specifically create and loaded with the subset of data and then the OLAP cube is built and processed to make the data available to the end-users via standard OLAP client tools. Why build OLAP data marts? Market research companies sell data to their clients to make money. To gain competitive advantage, market research providers like to "add value" to their data by providing systems that enhance analytics, thereby allowing clients to make best use of the data. As such, OLAP cubes have become a standard way of delivering added value to clients. They can be built on-the-fly to hold specific data sets and meet particular needs and then hosted on a secure intranet site for remote access, or shipped to clients' own infrastructure for hosting. Even better, they support a wide range of different tools for analytical purposes, including the ever popular Microsoft Excel. Extension Attributes: The Challenge One of the key challenges in building multiple OLAP data marts based on the same 'template' is handling extension attributes. These are attributes that meet the client's specific reporting needs, but do not form part of the standard template. Now clearly, these extension attributes have to come into the system via additional files and ultimately be added to relational tables so they can end up in the OLAP cube. However, processing these files and filling dynamically altered tables with SSIS is a challenge as SSIS packages tend to break as soon as the database schema changes. There are two approaches to this: (1) dynamically build an SSIS package in memory to match the new database schema using C#, or (2) have the extension attributes provided as name/value pairs so the file's schema does not change and can easily be loaded using SSIS. The problem with the first approach is the complexity of writing an awful lot of complex C# code. The problem of the second approach is that name/value pairs are useless to an OLAP cube; so they have to be pivoted back into a proper relational table somewhere in the data load process WITHOUT breaking SSIS. How this can be done will be part of future blog entry. What is involved in building an OLAP data mart? There are a great many steps involved in building OLAP data marts on-the-fly. The key point is that all the steps must be automated to allow for the production of multiple OLAP data marts per day (i.e. many thousands, each with its own specific data set and attributes). Now most of these steps have a great deal in common with standard data warehouse practices. The key difference is that the databases are all built to order. The only permanent database is the metadata database (shown in orange) which holds all the metadata needed to build everything else (i.e. client orders, configuration information, connection strings, client specific requirements and attributes etc.). The staging database (shown in red) has a short life: it is built, populated and then ripped down as soon as the OLAP Data Mart has been populated. In the diagram below, the OLAP data mart comprises the two blue components: the Data Mart which is a relational database and the OLAP Cube which is an OLAP database implemented using Microsoft Analysis Services (SSAS). The client may receive just the OLAP cube or both components together depending on their reporting requirements.  So, in broad terms the steps required to fulfil a client order are as follows: Step 1: Prepare metadata Create a set of database names unique to the client's order Modify all package connection strings to be used by SSIS to point to new databases and file locations. Step 2: Create relational databases Create the staging and data mart relational databases using dynamic SQL and set the database recovery mode to SIMPLE as we do not need the overhead of logging anything Execute SQL scripts to build all database objects (tables, views, functions and stored procedures) in the two databases Step 3: Load staging database Use SSIS to load all data files into the staging database in a parallel operation Load extension files containing name/value pairs. These will provide client-specific attributes in the OLAP cube. Step 4: Load data mart relational database Load the data from staging into the data mart relational database, again in parallel where possible Allocate surrogate keys and use SSIS to perform surrogate key lookup during the load of fact tables Step 5: Load extension tables & attributes Pivot the extension attributes from their native name/value pairs into proper relational tables Add the extension attributes to the views used by OLAP cube Step 6: Deploy & Process OLAP cube Deploy the OLAP database directly to the server using a C# script task in SSIS Modify the connection string used by the OLAP cube to point to the data mart relational database Modify the cube structure to add the extension attributes to both the data source view and the relevant dimensions Remove any standard attributes that not required Process the OLAP cube Step 7: Backup and drop databases Drop staging database as it is no longer required Backup data mart relational and OLAP database and ship these to the client's infrastructure Drop data mart relational and OLAP database from the build server Mark order complete Start processing the next order, ad infinitum. So my future blog posts and my forthcoming session at the SQLBits conference will all focus on some of the more interesting aspects of building OLAP data marts on-the-fly such as handling the load of extension attributes and how to dynamically alter the structure of an OLAP cube using C#.

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• Design for complex ATG applications

  - by Glen Borkowski

  Overview Needless to say, some ATG applications are more complex than others.  Some ATG applications support a single site, single language, single catalog, single currency, have a single development staff, single business team, and a relatively simple business model.  The real complex applications have to support multiple sites, multiple languages, multiple catalogs, multiple currencies, a couple different development teams, multiple business teams, and a highly complex business model (and processes to go along with it).  While it's still important to implement a proper design for simple applications, it's absolutely critical to do this for the complex applications.  Why?  It's all about time and money.  If you are unable to manage your complex applications in an efficient manner, the cost of managing it will increase dramatically as will the time to get things done (time to market).  On the positive side, your competition is most likely in the same situation, so you just need to be more efficient than they are. This article is intended to discuss a number of key areas to think about when designing complex applications on ATG.  Some of this can get fairly technical, so it may help to get some background first.  You can get enough of the required background information from this post.  After reading that, come back here and follow along. Application Design Of all the various types of ATG applications out there, the most complex tend to be the ones in the telecommunications industry - especially the ones which operate in multiple countries.  To get started, let's assume that we are talking about an application like that.  One that has these properties: Operates in multiple countries - must support multiple sites, catalogs, languages, and currencies The organization is fairly loosely-coupled - single brand, but different businesses across different countries There is some common functionality across all sites in all countries There is some common functionality across different sites within the same country Sites within a single country may have some unique functionality - relative to other sites in the same country Complex product catalog (mostly in terms of bundles, eligibility, and compatibility) At this point, I'll assume you have read through the required reading and have a decent understanding of how ATG modules work... Code / configuration - assemble into modules When it comes to defining your modules for a complex application, there are a number of goals: Divide functionality between the modules in a way that maps to your business Group common functionality 'further down in the stack of modules' Provide a good balance between shared resources and autonomy for countries / sites Now I'll describe a high level approach to how you could accomplish those goals...  Let's start from the bottom and work our way up.  At the very bottom, you have the modules that ship with ATG - the 'out of the box' stuff.  You want to make sure that you are leveraging all the modules that make sense in order to get the most value from ATG as possible - and less stuff you'll have to write yourself.  On top of the ATG modules, you should create what we'll refer to as the Corporate Foundation Module described as follows: Sits directly on top of ATG modules Used by all applications across all countries and sites - this is the foundation for everyone Contains everything that is common across all countries / all sites Once established and settled, will change less frequently than other 'higher' modules Encapsulates as many enterprise-wide integrations as possible Will provide means of code sharing therefore less development / testing - faster time to market Contains a 'reference' web application (described below) The next layer up could be multiple modules for each country (you could replace this with region if that makes more sense).  We'll define those modules as follows: Sits on top of the corporate foundation module Contains what is unique to all sites in a given country Responsible for managing any resource bundles for this country (to handle multiple languages) Overrides / replaces corporate integration points with any country-specific ones Finally, we will define what should be a fairly 'thin' (in terms of functionality) set of modules for each site as follows: Sits on top of the country it resides in module Contains what is unique for a given site within a given country Will mostly contain configuration, but could also define some unique functionality as well Contains one or more web applications The graphic below should help to indicate how these modules fit together: Web applications As described in the previous section, there are many opportunities for sharing (minimizing costs) as it relates to the code and configuration aspects of ATG modules.  Web applications are also contained within ATG modules, however, sharing web applications can be a bit more difficult because this is what the end customer actually sees, and since each site may have some degree of unique look & feel, sharing becomes more challenging.  One approach that can help is to define a 'reference' web application at the corporate foundation layer to act as a solid starting point for each site.  Here's a description of the 'reference' web application: Contains minimal / sample reference styling as this will mostly be addressed at the site level web app Focus on functionality - ensure that core functionality is revealed via this web application Each individual site can use this as a starting point There may be multiple types of web apps (i.e. B2C, B2B, etc) There are some techniques to share web application assets - i.e. multiple web applications, defined in the web.xml, and it's worth investigating, but is out of scope here. Reference infrastructure In this complex environment, it is assumed that there is not a single infrastructure for all countries and all sites.  It's more likely that different countries (or regions) could have their own solution for infrastructure.  In this case, it will be advantageous to define a reference infrastructure which contains all the hardware and software that make up the core environment.  Specifications and diagrams should be created to outline what this reference infrastructure looks like, as well as it's baseline cost and the incremental cost to scale up with volume.  Having some consistency in terms of infrastructure will save time and money as new countries / sites come online.  Here are some properties of the reference infrastructure: Standardized approach to setup of hardware Type and number of servers Defines application server, operating system, database, etc... - including vendor and specific versions Consistent naming conventions Provides a consistent base of terminology and understanding across environments Defines which ATG services run on which servers Production Staging BCC / Preview Each site can change as required to meet scale requirements Governance / organization It should be no surprise that the complex application we're talking about is backed by an equally complex organization.  One of the more challenging aspects of efficiently managing a series of complex applications is to ensure the proper level of governance and organization.  Here are some ideas and goals to work towards: Establish a committee to make enterprise-wide decisions that affect all sites Representation should be evenly distributed Should have a clear communication procedure Focus on high level business goals Evaluation of feature / function gaps and how that relates to ATG release schedule / roadmap Determine when to upgrade & ensure value will be realized Determine how to manage various levels of modules Who is responsible for maintaining corporate / country / site layers Determine a procedure for controlling what goes in the corporate foundation module Standardize on source code control, database, hardware, OS versions, J2EE app servers, development procedures, etc only use tested / proven versions - this is something that should be centralized so that every country / site does not have to worry about compatibility between versions Create a innovation team Quickly develop new features, perform proof of concepts All teams can benefit from their findings Summary At this point, it should be clear why the topics above (design, governance, organization, etc) are critical to being able to efficiently manage a complex application.  To summarize, it's all about competitive advantage...  You will need to reduce costs and improve time to market with the goal of providing a better experience for your end customers.  You can reduce cost by reducing development time, time allocated to testing (don't have to test the corporate foundation module over and over again - do it once), and optimizing operations.  With an efficient design, you can improve your time to market and your business will be more flexible  and agile.  Over time, you'll find that you're becoming more focused on offering functionality that is new to the market (creativity) and this will be rewarded - you're now a leader. In addition to the above, you'll realize soft benefits as well.  Your staff will be operating in a culture based on sharing.  You'll want to reward efforts to improve and enhance the foundation as this will benefit everyone.  This culture will inspire innovation, which can only lend itself to your competitive advantage.

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• Quaternion Camera Orbiting around a Sphere

  - by jessejuicer

  Background: I'm trying to create a game where the camera is always rotating around a single sphere. I'm using the DirectX D3DX math functions in C++ on Windows. The Problem: I cannot get both the camera position and orientation both working properly at the same time. Either one works but not both together. Here's the code for my quaternion camera that revolves around a sphere, always looking at the centerpoint of the sphere, ... as far as I understand it (but which isn't working properly): (I'm only going to present rotation around the X axis here, to simplify this post) Whenever the UP key is pressed or held down, the camera should rotate around the X axis, while looking at the centerpoint of the sphere (which is at 0,0,0 in the world). So, I build a quaternion that represents a small angle of rotation around the x axis like this (where 'deltaAngle' is a small enough number for a slow rotation): D3DXVECTOR3 rotAxis; D3DXQUATERNION tempQuat; tempQuat.x = 0.0f; tempQuat.y = 0.0f; tempQuat.z = 0.0f; tempQuat.w = 1.0f; rotAxis.x = 1.0f; rotAxis.y = 0.0f; rotAxis.z = 0.0f; D3DXQuaternionRotationAxis(&tempQuat, &rotAxis, deltaAngle); ...and I accumulate the result into the camera's current orientation quat, like this: D3DXQuaternionMultiply(&cameraOrientationQuat, &cameraOrientationQuat, &tempQuat); ...which all works fine. Now I need to build a view matrix to pass to DirectX SetTransform function. So I build a rotation matrix from the camera orientation quat as follows: D3DXMATRIXA16 rotationMatrix; D3DXMatrixIdentity(&rotationMatrix); D3DXMatrixRotationQuaternion(&rotationMatrix, &cameraOrientationQuat); ...Now (as seen below) if I just transpose that rotationMatrix and plug it into the 3x3 section of the view matrix, then negate the camera's position and plug it into the translation section of the view matrix, the rotation magically works. Perfectly. (even when I add in rotations for all three axes). There's no gimbal lock, just a smooth rotation all around in any direction. BUT- this works even though I never change the camera's position. At all. Which sorta blows my mind. I even display the camera position and can watch it stay constant at it's starting point (0.0, 0.0, -4000.0). It never moves, but the rotation around the sphere is perfect. I don't understand that. For proper view rotation, the camera position should be revolving around the sphere. Here's the rest of building the view matrix (I'll talk about the commented code below). Note that the camera starts out at (0.0, 0.0, -4000.0) and m_camDistToTarget is 4000.0: /* D3DXVECTOR3 vec1; D3DXVECTOR4 vec2; vec1.x = 0.0f; vec1.y = 0.0f; vec1.z = -1.0f; D3DXVec3Transform(&vec2, &vec1, &rotationMatrix); g_cameraActor->pos.x = vec2.x * g_cameraActor->m_camDistToTarget; g_cameraActor->pos.y = vec2.y * g_cameraActor->m_camDistToTarget; g_cameraActor->pos.z = vec2.z * g_cameraActor->m_camDistToTarget; */ D3DXMatrixTranspose(&g_viewMatrix, &rotationMatrix); g_viewMatrix._41 = -g_cameraActor->pos.x; g_viewMatrix._42 = -g_cameraActor->pos.y; g_viewMatrix._43 = -g_cameraActor->pos.z; g_viewMatrix._44 = 1.0f; g_direct3DDevice9->SetTransform( D3DTS_VIEW, &g_viewMatrix ); ...(The world matrix is always an identity, and the perspective projection works fine). ...So, without the commented code being compiled, the rotation works fine. But to be proper, for obvious reasons, the camera position should be rotating around the sphere, which it currently is not. That's what the commented code is supposed to do. And when I add in that chunk of code to do that, and look at all the data as I hold the keys down (using UP, DOWN, LEFT, RIGHT to rotate different directions) all the values look correct! The camera position is rotating around the sphere just fine, and I can watch that happen visually too. The problem is that the camera orientation does not lookat the center of the sphere. It always looks straight forward down the z axis (toward positive z) as it revolves around the sphere. Yet the values of both the rotation matrix and the view matrix seem to be behaving correctly. (The view matrix orientation is the same as the rotation matrix, just transposed). For instance if I just hold down the key to spin around the x axis, I can watch the values of the three axes represented in the view matrix (x, y, and z axes)... view x-axis stays at (1.0, 0.0, 0.0), and view y-axis and z-axis both spin around the x axis just fine. All the numbers are changing as they should be... well, almost. As far as I can tell, the position of the view matrix is spinning around the sphere one direction (like clockwise), and the orientation (the axes in the view matrix) are spinning the opposite direction (like counter-clockwise). Which I guess explains why the orientation appears to stay straight ahead. I know the position is correct. It revolves properly. It's the orientation that's wrong. Can anyone see what am I doing wrong? Am I using these functions incorrectly? Or is my algorithm flawed? As usual I've been combing my code for simple mistakes for many hours. I'm willing to post the actual code, and a video of the behavior, but that will take much more effort. Thought I'd ask this way first.

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• Clearing C#'s WebBrowser control's cookies for all sites WITHOUT clearing for IE itself

  - by Helgi Hrafn Gunnarsson

  Hail StackOverflow! The short version of what I'm trying to do is in the title. Here's the long version. I have a bit of a complex problem which I'm sure I will receive a lot of guesses as a response to. In order to keep the well-intended but unfortunately useless guesses to a minimum, let me first mention that the solution to this problem is not simple, so simple suggestions will unfortunately not help at all, even though I appreciate the effort. C#'s WebBrowser component is fundamentally IE itself so solutions with any sorts of caveats will almost certainly not work. I need to do exactly what I'm trying to do, and even a seemingly minor caveat will defeat the purpose completely. At the risk of sounding arrogant, I need assistance from someone who really has in-depth knowledge about C#'s WebBrowser and/or WinInet and/or how to communicate with Windows's underlying system from C#... or how to encapsulate C++ code in C#. That said, I don't expect anyone to do this for me, and I've found some promising hints which are explained later in this question. But first... what I'm trying to achieve is this. I have a Windows.Forms component which contains a WebBrowser control. This control needs to: Clear ALL cookies for ALL websites. Visit several websites, one after another, and record cookies and handle them correctly. This part works fine already so I don't have any problems with this. Rinse and repeat... theoretically forever. Now, here's the real problem. I need to clear all those cookies (for any and all sites), but only for the WebBrowser control itself and NOT the cookies which IE proper uses. What's fundamentally wrong with this approach is of course the fact that C#'s WebBrowser control is IE. But I'm a stubborn young man and I insist on it being possible, or else! ;) Here's where I'm stuck at the moment. It is quite simply impossible to clear all cookies for the WebBrowser control programmatically through C# alone. One must use DllImport and all the crazy stuff that comes with it. This chunk works fine for that purpose: [DllImport("wininet.dll", SetLastError = true)] private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength); And then, in the function that actually does the clearing of the cookies: InternetSetOption(IntPtr.Zero, INTERNET_OPTION_END_BROWSER_SESSION, IntPtr.Zero, 0); Then all the cookies get cleared and as such, I'm happy. The program works exactly as intended, aside from the fact that it also clears IE's cookies, which must not be allowed to happen. The problem is that this also clears the cookies for IE proper, and I can't have that happen. From one fellow StackOverflower (if that's a word), Sheng Jiang proposed this to a different problem in a comment, but didn't elaborate further: "If you want to isolate your application's cookies you need to override the Cache directory registry setting via IDocHostUIHandler2::GetOverrideKeyPath" I've looked around the internet for IDocHostUIHandler2 and GetOverrideKeyPath, but I've got no idea of how to use them from C# to isolate cookies to my WebBrowser control. My experience with the Windows registry is limited to RegEdit (so I understand that it's a tree structure with different data types but that's about it... I have no in-depth knowledge of the registry's relationship with IE, for example). Here's what I dug up on MSDN: IDocHostUIHandler2 docs: http://msdn.microsoft.com/en-us/library/aa753275%28VS.85%29.aspx GetOverrideKeyPath docs: http://msdn.microsoft.com/en-us/library/aa753274%28VS.85%29.aspx I think I know roughly what these things do, I just don't know how to use them. So, I guess that's it! Any help is greatly appreciated.

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• Does a cable / adaptor for my needs exist? (photos)

  - by Evan

  I recently bought a UPS, however, the only outlets take this sort of connector: But, the other end of the cables is like this (right): The thing is, I really need to connect it to a power bar, so I need a cable that has one end like in the first photo, and the second end like this (right side): I've searched around for quite a while, and asked at a few shops, but cannot seem to find a cable that will fulfill this purpose. This seems crazy to me, as I would think that a UPS wouldn't only be able to be attached to devices that take the relatively obscure output seen on the right side of the second image I posted. Do I need to buy another UPS that has the proper connectors?? Please help!!

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• Litespeed enable Access-Control-Allow-Origin

  - by Joe Coder Guy

  Seriously, I can't find a single page discussing this for litespeed. Using this format in the htaccess "Header set Access-Control-Allow-Origin http://aSite.com" (and https) sends the setting in the header, but I still get the "XMLHttpRequest cannot load https://aSite.com/aFile.php. Origin aSite.com is not allowed by Access-Control-Allow-Origin" error. Is the server still blocking it even though I've sent the proper headers? I read elsewhere that it helps to add these terms Access-Control-Allow-Headers X-Requested-With Access-Control-Allow-Methods OPTIONS, GET, POST Access-Control-Allow-Headers Content-Type, Depth, User-Agent, X-File-Size, X-Requested-With, If-Modified-Since, X-File-Name, Cache-Control but I don't see these in my headers. Using these, my PHP files aren't even reached (because they register no errors or anything), so it looks like it comes from the server only, but what do I know. Thanks in advance!

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• Unable to make admin interface connection to server when moving a mailbox.

  - by TheCodeMonk

  I have an existing Exchange 2003 server running on Windows Server 2003. I am in the process of replacing our current server infrastructure and virtualizing it all in Hyper-V. I have Essential Business Server 2008 installed in 3 separate VMs and running. Everything seems to be working fine so far. I am now trying to migrate my exchange mailboxes over to the new exchange server in the messaging server and every time I try I get this error: MapiExceptionNetworkError: Unable to make admin interface connection to server. (hr=0x80040115, ec=-2147221227) I have done some searching and found solutions like adding the computer to the exchange domain servers groups and install group, also making sure the user logged into the new server is in the proper groups. I also saw a solution in making sure that any unused NICs are disabled. I've tried all that to no avail.

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• Disable reverse PTR check in Zimbra and force accept from invalid domains

  - by ewwhite

  I've moved an older Sendmail/Dovecot system to a Zimbra community edition system. I need to be able to receive messages from certain standalone Linux hosts that may not have valid A records or proper reverse DNS entries established (e.g. AT&T is the ISP or systems sitting on a consumer-level ISP). Establishing the reverse DNS or setting a SMARTHOST is not an option. The error I get in zimbra.log is: zimbra postfix/smtp[2200]: DB83B231B53: to=<root@host_name.baddomain.com>, relay=none, delay=0.07, delays=0.06/0/0/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=host_name.baddomain.com type=A: Host not found How can I override this? Is this more of a Postfix issue or is it Zimbra? edit - The problem seems to be with an underscore in the hostname of the server. So it's a problem with root@host_name.baddomain.com. Again, how can I override this in Zimbra?

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• Vmconnect.exe on Windows7

  - by Xiuhtecuhtli

  I running Windows Server 2008 w/Hyper-V. The Network properly works and I can access the VM's From a Hyper-V enabled 2008 Machine. No problems there. BUT... I want to be able to connect to my Guest Machines from my Windows7 Pro Laptop. I was hoping it would be simular to copy/pasting VMCONNECT.EXE to my sys32 folder. But.. It Failed saying i did not have the proper feature installed. My Question to the Guru's of SuperUser, Is their a way to run VMCONNECT.EXE from a Windows7 client?

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• Elapsed time display in foobar 2000

  - by tripleowl

  The elapsed and total time display in Foobar 2000 with the Metro skin (download here) I use, is not aligned properly. I can't see the minutes track has played, which comes first. The time to the right of the track name is chopped. However on the seekbar it is ok. Click for a full sized image There are scripts in the ELPlaylist settings window which I get when I right click on the playlist window. But unfortunately I don't know which parameter if any in the script should be changed to set a proper time format for the track duration, which would allow me to see the elapsed time. Relevant ELplaylist code Track list Groupheader Per second

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• Install Additional Printer Drivers (x86) on Vista (x64) - Can't find suitable (x86) ntprint.inf

  - by jmohr

  I have a printer connected to my computer that I'd like to share on my home network - shouldn't be a problem. The computer the printer is connected to is running Vista Ultimate x64. The computers I'm trying to share with are x86 Windows XP Professional and x86 Vista, so I need to install additional (x86) drivers. I checked the box to add x86 printer drivers and then it asked for the location of the drivers. I browsed to the location and clicked OK. It then prompted "Please provide path to Windows media (x86 processor). When I click "Browse..." it wants the location of a file named ntprint.inf It looks like it's asking for a Windows (x86) installation disk. I put one in but I can't seem to find this file on the 32-bit Vista install disk Where is the proper place to find this file?

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• MinGW tar compression problem

  - by Shiftbit

  I am unable to get the Mingw tar to work with compress files. It does not filter through the proper compression utility. However, tar will work if I manually uncompress the file first. I have tried in both the MSYS shell and Windows cmd. Has anyone had this problem or is it a MinGW bug? For example, this does not work: C:\Users\home\Desktop>tar -tzf wdiff-0.5.tar.gz tar: Cannot use compressed or remote archives tar: Error is not recoverable: exiting now C:\Users\home\Desktop>tar -t -Zgzip -f wdiff-0.5.tar.gz tar: Cannot use compressed or remote archives tar: Error is not recoverable: exiting now C:\Users\home\Desktop>tar -tf wdiff-0.5.tar.gz tar: Hmm, this doesn't look like a tar archive tar: Skipping to next file header tar: Only read 6732 bytes from archive wdiff-0.5.tar.gz tar: Error is not recoverable: exiting now However, this works: gzip -d wdiff-0.5.tar.gz tar -tf wdiff-0.5.tar

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• How can I clean up my bashrc/zshrc file?

  - by LuxuryMode

  Over time, I've added bunches of stuff to my PATH and it's lookin' pretty awful. How can I clean this up or what's the proper way to "reformat" all of this? export PATH="$PATH:~/scripts" export PATH="$PATH:~/Downloads/android-sdk-mac_x86/platform-tools/adb" export PATH=/opt/local/bin:/opt/local/sbin:$PATH export PATH="$PATH:~/Downloads/android-sdk-mac_x86/platform-tools:~/Downloads/android-sdk-mac_x86/tools:~/Downloads/android-sdk-mac_x86/platform-tools/adb" export PATH="$PATH:~/bin" export PATH="$PATH:~/bin/subl" export PATH="$PATH:~/.rvm/gems/ruby-1.9.3-head/gems/git-media-0.1.1/bin" export PATH=$PATH:$HOME/bin:/Users/me/Downloads/android-sdk-mac_86/tools export PATH=$PATH:$HOME/bin:/Users/me/Downloads/android-sdk-mac_86/platform-tools export PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11/bin:/.rvm/scripts/rvm:/.rvm/scripts/rvm:/~/Downloads/android-sdk-mac_x86/tools/android:/~/Downloads/android-ndk-r7/:/~/Downloads/android-sdk-mac_x86/platform-tools export CC=gcc-4.2 export PATH=~/Downloads/android-ndk-r7:$PATH ANDROID_HOME=~/Downloads/android-sdk-mac_x86 export PATH=${PATH}:$ANDROIDHOME/platform-tools

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• Apache 301 redirect

  - by mcondiff

  I have inherited a server with a couple of domains on it. The website was reworked within the last two years and I am trying to oblige a request by staff to get a redirect to work properly (if it can given the default structure). So right now on the server I have a redirect that takes every 301 and dumps it onto the front page of the website. RedirectMatch /(.) http://www.example.com This has worked well for most of the old URL's coming in from various websites containing the old liking structure. However, now a staff member wants a single URL which is somewhat widely used to be redirected to it's proper place. Redirect /new/research/Exp_Rese_Disc/Asia/example.shtml http://example.com/asia/ Is this possible without killing the all encompassing 301 redirect? To have a general RedirectMatch /(.) redirect as well as a singular redirect? As of right now it is not seeming to let me. Any ideas, thoughts or examples are much appreciated.

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• Error: "failed to connect to wpa_supplicant - wpa_ctrl_open no such file or directory" using netcfg with wpa_supplicant

  - by user1576628

  I'm trying to set up netcfg so that I can finish installing Arch Linux (using the instructions from the Beginners' Guide and netcfg) and I passed over what was meant to be a short step. Open wifi-menu, select network, enter password. After multiple attempts, I decided to edit the profile manually, which yielded no improvement. Eventually I decided to use netfcg with the more familiar wpa_supplicant. My /etc/wpa_supplicant.conf file is as follows: network={ ssid="my_ssid" #psk="my_wireless_passcode" psk="my_wireless_passcode_hex" } (Replacing generic names with my actual ssid and psk.) And my /etc/network.d/wpa_suppl file reads: CONNECTION='wireless' DESCRIPTION='A wpa_supplicant configuration based wireless connection' INTERFACE='wlan0' SECURITY='wpa-config' WPA_CONF='/etc/wpa_supplicant.conf' IP='dhcp' My ssid is not hidden, wlan0 is the proper interface, and wpa_supplicant works fine on its own, but using netcfg wpa_suppl, it returns failed to connect to wpa_supplicant - wpa_ctrl_open no such file or directory about twelve times before finally telling me the authentication failed. What can I do to fix this?

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• Lotus Notes 8.5.3 "Unable To Invoke Program"

  - by Ross Doughty

  Just got a little issue with some of my users today, when trying to open an email attachment in Lotus Notes, they get the error Unable To Invoke Program. Now, they can always just save the attachment and then open it through windows explorer, which is fine, but I would rather get a proper solution for this. Knowing almost nothing about Lotus Notes does not help me I know but I think it may have something to do with the default file association, however my colleague tells me that Notes uses the windows file associations, which are working. Any ideas anyone?

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• VPN with wrong subnet mask

  - by Philipp Schmid

  I followed these instructions on www.hottonetworking.com to set up VPN on a clean install of Windows Server 2008 SP2 (not R2 yet). When I then establish a VPN connection to that machine from a client machine (running Windows 7 RC), everything succeeds (it seems since I get a 'Connected' state in the network sharing center window), but I end up with a subnet mask (according to ipconfig /all) of 255.255.255.255 instead of 255.255.255.0. The net effect is that I don't have local network or internet capability. What additional configuration steps do I have to do to get VPN with the proper subnet mask working? Update: Using the steps outlined in the Technet article mentioned by Mr. Nimble, I was able to get internet connection. Apparently the subnet mask is not an issue as my coworker was able to connect using his VPN connection and ping the server machine by name as well.

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• Configuring RAID1 on HP Proliant Microserver N54L / Ubuntu 14.04.1 LTS [duplicate]

  - by Chris Beach

  This question already has an answer here: Cant find my harddrives in ubuntu installation? 2 answers I've bought a N54L and fitted two 3GB drives. Keen to get set up with RAID1. BIOS: SATA controller mode set to "RAID" RAID Option ROM utility: both physical drives set up as one logical drive When I came to install Ubuntu (14.04.1), both drives appeared during the setup process. I was only expecting to see the logical drive, although I'm a complete novice with RAID. I've read that the HP Proliant Microservers don't have "proper" RAID support, and require some kind of driver to be installed. I've tried a few HP utilities from the following apt repo: deb http://downloads.linux.hp.com/SDR/repo/mcp wheezy/current non-free On installation, most say "server not supported" Would appreciate your advice.

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• Unable to resolve FQDN, hostname works

  - by HannesFostie

  We are having an issue where computers who are not part of the domain cannot resolve the FQDN of a server (but regular hostname and ip do resolve). The strange thing is that this does work when the computer is added to the network. Our domain name is rather long, its something along the lines of "team.dept.company.com", could that be it? DHCP server passes along the proper DNS, Name and WINS servers, as well as the domain name. I thought that should've solved the problem, but apparently not really. Our domain is still windows2003 EDIT: I am starting to believe I can narrow this down to a problem either with the vmware tools NIC drivers that are embedded in my winPE boot image, or to the fact that I'm trying to do this from inside a VM. Pinging a FQDN at the same time when using a different task sequence on a physical machine works.

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• Hyper-V Boot failure on VHD made with Acronis?

  - by gary

  hoping someone can advise on my problem, I am running Hyper-V core and trying to create my first VM for testing purposes. Using Acronis True Image echo server with UR I converted a Seerver 2000 tib to VHD. I then copied this across to the Hyper-V local drive and created a new VM pointing the hard drive to the vhd image. When I boot this up all I get is "Boot failure. Reboot and Select proper Boot device or Insert Boot media in selected Boot device". The original server had SCSI disks, the Hyper-V server doesn't, but I have ensured that it boots from an IDE disk and that it is in fact booting from that not the CD. I can only imagine this is caused by the SCSI disks on VHD but cannot for the life of me work out how to fix, I have several of these I need to do so starting to worry now! I can confirm that when I did this from tib to vmdk it worked first time using VMware on a laptop. Any help very much appreciated. Gary

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• "Recursive" Wildcard DNS for Amazon Route 53

  - by Brian

  The title of the question might be misleading because I'm not an expert and I'm trying to learn the proper terminology. That being said, I'm wondering if it's possible to setup a wildcard DNS record for any number of dot separation in domain names and have them all point to the network root. This is for WordPress multisite, users will have the option of choosing a mapped domain name, I want to configure my DNS so that both mysite.co.uk.network.com and mysite.com.network.com are valid (I realize this is a but ugly, but WordPress multisite requires that each site have a unique site_url and I'd prefer to preserve the period-delimited appearance if it's possible).

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• Ionics Rewrite Filter setup on IIS 5.1

  - by Neil Aitken

  I'm trying to configure IIRF 2 on IIS 5.1 running on XP Pro, so that I can run the Zend Framework. I've managed to get the filter running on a second website that I setup using one the IIS admin scripts. When I goto iirfStatus I get this: The problem is the .ini path for the site is pointing to c:\windows\system32\Irif.ini rather than the site root. If I try creating an IIS application under IIS-Website Properties-Home Directory then iirfStatus stops working entirely. Any ideas how I can set the ini path correctly, or will I only be able to get away with this on a proper server edition of IIS?

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• Why PC reboots when there’s a power failure even with UPS?

  - by Jamil

  I've purchased a Line Interactive UPS 1200VA. It's supposed to give 8~20min backup (as written in the manual). This UPS has transfer time < 10ms. It works fine when the mains is active. But the problem is that when the power went off, the PC also went off for a fraction of a second and started rebooting. The strangest thing though is that it has to be a proper power failure by the service supplier. If I just turn off the power at the wall plug, the UPS kicks in immediately and the PC carries on working fine. What's the solution of that? What should I do? My hard drive was physically damaged because of improper shut down & restart. I've 5~8 times power outage in my country so I badly need an UPS.

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• Broadcom NIC Teaming with Hyper-V R2

  - by Brian McCleary

  I have read a few contradictory articles regarding support or at least configuration with teaming of Broadcom NIC's and Hyper-V. I have a pair of Dell R805's with 4 Broadcom 5708 NIC's in them. I have teamed them up (one team for public connections and one for private connections) and I have installed Hyper-V. I am getting some intermittent connection issues though and I'm concerned that it might be due to the teaming. Basically I am wondering if anyone has successfully setup NIC teaming in the parent partition and used the teamed adapters through the Hyper-V switch. If so, what is the configuration/proper steps that you used to configure this. I have the server running Windows Server 2008 R2. Right now the server is in test mode, but my concern is that we won't see any issues until we move it into production and get some heavy traffic on the ports.

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• Schedule task in Windows 2008

  - by Joseph

  Hi i was trying to schedule one application in Windows 2008 server. and i can see that the schedeule is showing running in the task Scheduler, but nothing is happening(i mean the program that i scheduled is not working) and the schedule is not stopping also(i specificaly choose if the schedule runing more than 3 hours stop it automatically) i went through several links and im sure im scheduling it in proper way. is anybody facing this problem on Windows 2008? any resolution. Appreciate your feedback. Regards Joseph

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