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  • Building a Data Warehouse

    - by Paul
    I've seen tutorials articles and posts on how to build datawarehouses with star and snowflakes schemas, denormalization of OLTP databases fact and dimension tables and so on. Also seen comments like: Star schemas are for datamarts, at best. There is absolutely no way a true enterprise data warehouse could be represented in a star schema, or snowflake either. I want to create a database that will server for reporting services and maybe (if that isn't enough) install analisys services and extract reports and data from cubes. My question was : Is it really necesarry to redesign my current database and follow the star/snowflake schemas with fact and dimension tables ? Thank you

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  • iptables: limiting bytes downloaded per IP per day?

    - by Miles
    On a public-facing web server, I'd like to limit the total bytes downloaded per IP address per day. For example, after a visitor downloaded 100MB, any additional requests would be dropped or rejected for the next 24 hours. Is it possible to accomplish this using iptables alone? The connbytes, connlimit, hashlimit, quota, and recent options all look promising, but the man page plays its cards close to the vest (e.g., "quota - Implements network quotas by decrementing a byte counter with each packet. --quota bytes The quota in bytes."). Would like to avoid using a proxy (like Squid) if possible.

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  • Why do my Application Compatibility Toolkit Data Collectors fail to write to my ACT Log Share?

    - by Jay Michaud
    I am trying to get the Microsoft Application Compatibility Toolkit 5.6 (version 5.6.7320.0) to work, but I cannot get the Data Collectors to write to the ACT Log Share. The configuration is as follows. Machine: ACT-Server Domain: mydomain.example.com OS: Windows 7 Enterprise 64-bit Edition Windows Firewall configuration: File and Printer Sharing (SMB-In) is enabled for Public, Domain, and Private networks ACT Log Share: ACT Share permissions*: Group/user names Allow permissions --------------------------------------- Everyone Full Control Administrator Full Control Domain Admins Full Control Administrators Full Control ANONYMOUS LOGON Full Control Folder permissions*: Group/user name Allow permissions Apply to ------------------------------------------------- ANONYMOUS LOGON Read, write & execute This folder, subfolders, and files Domain Admins Full control This folder, subfolders, and files Everyone Read, write & execute This folder, subfolders, and files Administrators Full control This folder, subfolders, and files CREATOR OWNER Full control Subfolders and files SYSTEM Full control This folder, subfolders, and files INTERACTIVE Traverse folder / This folder, subfolders, and files execute file, List folder / read data, Read attributes, Read extended attributes, Create files / write data, Create folders / append data, Write attributes, Write extended attributes, Delete subfolders and files, Delete, Read permissions SERVICE (same as INTERACTIVE) BATCH (same as INTERACTIVE) *I am fully aware that these permissions are excessive, but that is beside the point of this question. Some of the clients running the Data Collector are domain members, but some are not. I am working under the assumption that this is a Windows file sharing permission issue or a network access policy issue, but of course, I could be wrong. It is my understanding that the Data Collector runs in the security context of the SYSTEM account, which for domain members appears on the network as MYDOMAIN\machineaccount. It is also my understanding from reading numerous pieces of documentation that setting the ANONYMOUS LOGON permissions as I have above should allow these computer accounts and non-domain-joined computers to access the share. To test connectivity, I set up the Windows XP Mode virtual machine (VM) on ACT-Server. In the VM, I opened a command prompt running as SYSTEM (using the old "at" command trick). I used this command prompt to run explorer.exe. In this Windows Explorer instance, I typed \ACT-Server\ACT into the address bar, and then I was prompted for logon credentials. The goal, though, was not to be prompted. I also used the "net use /delete" command in the command prompt window to delete connections to the ACT-Server\IPC$ share each time my connection attempt failed. I have made sure that the appropriate exceptions are Since ACT-Server is a domain member, the "Network access: Sharing and security model for local accounts" security policy is set to "Classic - local users authenticate as themselves". In spite of this, I still tried enabling the Guest account and adding permissions for it on the share to no effect. What am I missing here? How do I allow anonymous logons to a shared folder as a step toward getting my ACT Data Collectors to deposit their data correctly? Am I even on the right track, or is the issue elsewhere?

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  • Data drive disappearing.

    - by Mike Keller
    We have a Windows 2003 R2 server with SP 2 here that randomly loses a partition. There are two partitions the C: and the D: (the one that disappears). When I go into Disk Management the space shows available on the drive but that it isn't formated. There are two drives that are set up in a RAID 1 array. There isn't anything sticking out in the event log as to something triggering this problem and thank god we do daily backups of the data, but it gets kind of annoying to have to go back in there and reformat the partition and restore the data. Any places I can poke around to find the cause of this or even better solutions to the problem would be appreciated.

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  • Port based bandwidth shaping

    - by nixnotwin
    I have an interent connection with the speed of 4000k bits up and down. I want to do port based traffic shaping on a ubuntu machine, which acts as router. eth0 is the WAN interface. This is how I would like to allocate bandwidth: For ports 80 and 445 the bandwidth usage can go upto 90% For ports above 1024 upto 65535 the bandwidth usage can go upto 10% For remaining ports the bandwidth usage can go upto 40% The easiest way for achieving the above is using a router with tomato firmware. I have used it and it is very efficient. I want to try if it can be done on a Ubuntu or any GNU/Linux machine. I have googled extensively about the topic and I feel there isn't much information.

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  • How to recover data from software RAID 5 disk partition

    - by Ali n
    I have CentOS 5.8 on my computer, with 5x 1TB hard drives. I used software RAID. (RAID 1 as a boot partition md0, RAID 0 as a root partition md1 and RAID 5 as /home partition md3). Unfortunately one of these hard drives failed lately and I want to replace it with a new one. I want to know that is it possible to change this hard drive without data loss? The important partition is RAID 5 so in theory if one of hard drives failed I should be able to recover its data without any problem. But in practice how can I do that?

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  • Send keystrokes simultaneously to both host and slave over internet?

    - by donodarazao
    I would like to watch movies with a friend who lives far away from me. For this, the playback should be synchronized on both our pc. However, we have some constraints: Due to our low bandwidth internet, any form of streaming solution wouldn't work. We do however both have the same copy of the movie on our harddisks. We use movies to learn languages and because of this, we very frequently pause and rewind. The typical "3...2...1...go!" solution over skype wouldn't work because it would soon get out of sync. I imagine an approach that sends keystrokes simultaneously to both our pc would work (for example, if I press space to pause the movie at my pc, space should also be send to his pc). Any ideas how this could be realized? I looked into Synergy and InputDirector, but both neither seem to be an option, because I don't want to see the desktop of my friend, I want to see my desktop Keystrokes should be sent simultaneously to both pc, not just to one pc We have both Windows 7x64, and we might use any media player (VLC, XBMC,...).

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  • How does the data storage work? [closed]

    - by Andres Adhi
    I am really new to the whole concept of Data storage, Domain, Server and everything else related to this. Can someone pleases explain what a Domain is? How are server part of the Domain and How are Database stored in the Server or Domain? How does a new server be able to connect to existing database server to get all the data needed. I tried to find this information in the web but I am not really finding a good resource. It may be because these is really basic information. I will really appreciate if someone can explain these concept in plain terms. Thanks in advance.

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  • haproxy access list using path_dir having issues with firefox

    - by user11243
    I'm trying to route all requests containing a path directory of /socket.io/ to a separate port with HAProxy. Here is my config file: global maxconn 4096 # Total Max Connections. This is dependent on ulimit nbproc 2 defaults mode http frontend all 0.0.0.0:80 timeout client 86400000 default_backend web_servers acl is_stream path_dir socket.io use_backend stream_servers if is_stream backend web_servers balance roundrobin option forwardfor # This sets X-Forwarded-For timeout server 30000 timeout connect 4000 server web1 127.0.0.1:4000 weight 1 maxconn 1024 check backend stream_servers balance roundrobin option forwardfor # This sets X-Forwarded-For timeout queue 5000 timeout server 86400000 timeout connect 86400000 server stream1 127.0.0.1:5100 weight 1 maxconn 1024 check URL paths with a /socket.io/ get correctly directed to port 5100 in chrome and safari. However not for firefox. I'm running Haproxy locally on my mac for dev, not sure if it has anything to do with it. I'm using haproxy 1.4.8 and Firefox 3.6.15. I've tried clearing cache on firefox and it didn't help, so I'm thinking there's something wrong with the way HAProxy parses through the Firefox request headers.

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  • HP Rapid Deployment - Change Data Store Path

    - by David Carreyette
    I am running HP Rapid Deployment (Altiris eXpress Deployment Server 6.9 - Build 164) on an inherited Windows Server 2003 SP2. I need to change the Data Store Path as the default is pointing to the C: drive and there is not enough space there. I would like to set it to the D: drive where there is plenty of space. Reading the documentation: Data store path: Specifies the path to stored packages and files and other DS functions (such as license verification). The default path is C:\Program files\Altiris\express\Deployment Server. Note: Do not use this setting to change the path to the Deployment Share. Modifying this setting does not automatically allow you to use another shared directory other than the express share. To change the Deployment Share shared directory, run a Custom install to establish another location for the Deployment Share. Is there any other way I can change the path as I do not have the install media?

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  • Manually "draw" data for chart, output to CSV

    - by Ambidex
    I need a service that will allow me to draw a chart line by hand and generate data points for what I drew. This might sound crazy, but I need some data (preferably in CSV output) that will only approximately show value X at time Y and I do not want to go and produce these values by hand. I only have to know how it will flow along. Anyone know how to actually accomplish this? So, I would actually want to draw a line on a graph, and then get the output (X + Y) from that line I drew in a (preferably) CSV.

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  • Rebasing a branch which is public

    - by Dror
    I'm failing to understand how to use git-rebase, and I consider the following example. Let's start a repository in ~/tmp/repo: $ git init Then add a file foo $ echo "hello world" > foo which is then added and committed: $ git add foo $ git commit -m "Added foo" Next, I started a remote repository. In ~/tmp/bare.git I ran $ git init --bare In order to link repo to bare.git I ran $ git remote add origin ../bare.git/ $ git push --set-upstream origin master Next, lets branch, add a file and set an upstream for the new branch b1: $ git checkout -b b1 $ echo "bar" > foo2 $ git add foo2 $ git commit -m "add foo2 in b1" $ git push --set-upstream origin b1 Now it is time to switch back to master and change something there: $ echo "change foo" > foo $ git commit -a -m "changed foo in master" $ git push At this point in master the file foo contain changed foo, while in b1 it is still hello world. Finally, I want to sync b1 with the progress made in master. $ git checkout b1 $ git fetch origin $ git rebase origin/master At this point git st returns: # On branch b1 # Your branch and 'origin/b1' have diverged, # and have 2 and 1 different commit each, respectively. # (use "git pull" to merge the remote branch into yours) # nothing to commit, working directory clean At this point the content of foo in the branch b1 is change foo as well. So what does this warning mean? I expected I should do a git push, git suggests to do git pull... According to this answer, this is more or less it, and in his comment @FrerichRaabe explicitly say that I don't need to do a pull. What's going on here? What is the danger, how should one proceed? How should the history be kept consistent? What is the interplay between the case described above and the following citation: Do not rebase commits that you have pushed to a public repository. taken from pro git book. I guess it is somehow related, and if not I would love to know why. What's the relation between the above scenario and the procedure I described in this post.

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  • How do I back up my Windows partition from an Ubuntu live CD?

    - by lalli
    My Windows partition (C:) is corrupt. I'm booting up from an Ubuntu live CD and trying to copy all the files from C: to my external drive, but the system expands all of the links, producing a projected copy size of 1.8TB (my external drive is just 1TB, and the data in c: is around 700MB). Then I looked at dd and other backup utilities. Anything I looked into, I couldn't figure out whether or not the image would be readable in Windows through any other app. Has anyone else tried to back up data from a corrupted Windows installation using Ubuntu?

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  • Regression testing for firewall changes

    - by James C
    We have a number of firewalls in place around our organisation and in some cases packets can pass through four levels of firewall limiting the flow TCP traffic. A concept that I'm used to from software testing is regression testing, allowing you to run a test suite against a changed application to verify that the new changes haven't affected any old features. Does anyone have any experience or an offer any solutions to being able to perform the same type of thing with firewall changes and network testing? The problem becomes a lot more complicated because you'd ideally want to be originating (and testing receipt) of packets across many machines.

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  • Mikrotik queues and limiting total upstream bandwidth

    - by g18c
    With a Mikrotik router (form of embedded Linux) I have created simple queues per machine matched by source IP address. Each of the 4 machine queues has an unlimited burst 3Mbps/3Mbps for Tx/Rx. During speedtest.net on all 4 machines at the same time, each machine shows 3Mbps (and is limited correctly there), however the total bandwidth on the uplink goes to 12Mbps (i need to set this to 10Mbps max for the upstream). I want to restrict the actual traffic passing across the uplink port to 10Mbps regardless of what the other queues are doing (I need this catch all queue to have the final say on the uplink speed). For example I need: Scenario A Machine A transferring @ 3Mbps Machine B transferring @ 3Mbps Machine C transferring @ 3Mbps Machine D transferring @ 0Mbps Up-link speed = 9Mbps Scenario B Machine A trying to transfer @ 3Mbps Machine B trying to transfer @ 3Mbps Machine C trying to transfer @ 3Mbps Machine D trying to transfer @ 3Mbps Up-link speed = 10Mbps Actual transfer speed of machine A,B,C,D = 2.5Mbps This is to allow slight over subscription of bandwidth queues as not all will be transmitting at 3Mbps all the time. Is this possible and if so how would one go about doing this?

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  • Squid Proxy Server: limit total bandwidth

    - by Pitto
    Hello my dear friends! We have a marvellous squid proxy with dansguardian for filetering and they both work just great. Is there any easy way to limit the total bandwidth usage? I'd like to set the max amount of squid users internet use to 1200 since our total band is 2000 and I need the rest to ensure other services such as voip to work without hiccups related to huge downloads on the "internet side" of our connection and similar issues. I mean a total squid bandwidth limitation and not a user-based. Fair thanks to everybody.

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  • Windows Server 2008 Software Raid 5 - Data integrity issues

    - by Fopedush
    I've got a server running Windows Server 2008 R2, with a (windows native) software raid-5 array. The array consists of 7x 1TB Western Digital RE3 and RE4 drives. I have offline backups of this array. The problem is this: I noticed a few days ago after copying a large file to the disk that there was an integrity issue with that file - it was a ~12GB file that I had downloaded via uTorrent. After moving it to the raid array, I used uTorrent to relocate the download location, and performed a re-check so I could seed it from that location. The recheck found that only 6308/6310 chunks of the copied file were intact. My next step was to write a quick powershell script that would copy files to the array, while performing a SHA1 hash of the original and resultant files and comparing them. Smaller files (100-1000MB) copied over just fine. When I started copying larger data (~15GB), I found that the hash check failed about 2/3rds of the time. The corrupt files had very, very small inconsistencies - less than .01%. I further eliminated the possibility of networking or client issues by placing this large file on the C:\ of the server, and copying it repeatedly from there to the array, seeing similar results. Copying the data via explorer, powershell, or the standard windows command prompt yield the same results. None of the copies fail or report any problems. The raid array itself is listed as healthy in disk management. After a few experiments, I shut down the server and ran memtest overnight. No errors were detected. A basic run of chkdsk found no problems, but I did not use the /R flag, as I was unsure how that might affect a software raid-5 volume. I next ran Crystal Disk Info to check the smart data on the drives - but found that CDI only detected 5 out of 7 of the disks in the array. I have no idea why. Nevertheless, CDI shows the following "caution" flags on a single one of the drives: 05 199 199 140 000000000001 Reallocated Sectors Count C5 200 200 __0 000000000001 Current Pending Sector Count Which is a little bit alarming, but I don't really know what to do with the information. I hardly feel like one reallocated sector could be causing this. At this point, I'm looking for some guidance on what to do next. I need to determine the cause of this issue, but I'm hesitant to run chkdsk /R or any bootable disk health checkers because I'm afraid they might break the array. I've considered triggering a re-sync of the array, but I'm not actually sure how to do that without doing something silly like manually dropping a disk and then restoring it. Any advice that could help me ferret out the precise cause of this issue would be greatly appreciated.

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  • What caused Cyclic Redundancy Check error on my BitLocker-enabled external hard drive and how to fix it?

    - by Forgiver
    I have an external hard drive that is connected to my computer (Windows 7 Ultimate 64 bit) via a USB port. BitLocker has been activated on the hard drive to protect the data. Yesterday I started downloading a huge data from the internet but now it failed to complete because of CRC error. I tried to repair it with chkdsk f:/r where f is the drive letter of that hard drive. There are many messages reporting "unreadable" as follows: What caused Cyclic Redundancy Check error on my BitLocker-enabled external hard drive and how to fix it?

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  • split large text file without missing data record

    - by Santosh
    I have a 140 MB text file, which contains detail information of books in library. For each book details there is a standard format data details in text file. I need to parse it and insert the data in Database. Here, parsing text file is not an issue. I am facing problem in parsing this large file. So i decided to split the file in small file around 2 MB each file. But i can't manually split this large file in so many pieces. I got HJsplit tool, which split the file but this also doesn't helped as this split the file but 1 book details half part is in one file and rest part is in second file. so if i split this way then information will be missed. How to split the large so that i cant miss the information ? Is there any tool which help me in this condition.

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  • Protect apache pages by URL

    - by Thomas
    Is it possible to allow access to specific URLs only to certain networks? Basically, I would like to restrict access to the admin area only to the local network This area's pages are prefixed by /admin Essentially, I would like all /admin/* to be forbidden from public access. Can apache handle such a case? Thanks UPDATE Using your suggestions I came up to <LocationMatch admin> Order allow,deny deny from all Allow From 192.168.11.0/255.255.255.0 </LocationMatch> However, I get 403 even though I am on the network. Additionally, if I put apache behind haproxy, is this going to work? Because the traffic will be coming from 127.0.0.1 to apache

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  • Is it dangerous to use both Sky Drive and Dropbox?

    - by Matthew
    I'd like to experiment with Sky Drive, but keep using my Dropbox account unless I decide to switch. This answer gives instructions for how to set up both at the same time, but I'm a little worried about data integrity. Is there any danger involved here? Will Sky Drive and Dropbox fight each other? Note that I am using Sky Drive/Dropbox on multiple computers, so they will be writing data as well as reading it. Is this safe? Edit: I can use them with different folders if necessary, but I'm particularly curious what would happen if they sync from the same folder.

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  • Excel 2007: Exporting more than 100 columns to a .prn file but data is concatenated

    - by Don1
    I want to export an Excel worksheet to a space delimited (.prn) file. The worksheet is pretty big (187 columns) and when I set the column widths and try to export the worksheet to a .prn file, the data gets cut at the 98th column (i.e. about 200 characters wide for my data) and the rest is placed directly underneath. It's like I ripped a page in half from top to bottom and placed the right-hand side directly under the left-hand side. How would I get it to export everything without getting concatenated?

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  • Linux Program Source Management

    - by Blackninja543
    This particular problem has little do with SubVersion Repositories and more to do with the management of installed programs. My question revolves around the problem of installing a program from source. If I where to build a distro with no package management system what possibilities would I have for maintaining the program is up to date. My only idea would be to keep a record of all the programs installed from source and perform a periodic check to identify if a new version is out.

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  • Running Visual Studio 2010 in a University Campus

    - by Woondows
    We have just installed Windows 7 Enterprise x64 in one of our computer labs being used by students for programming. However, when we installed Visual Studio 2010 Ultimate on the machines, we found that to even launch the application (devenv.exe), required the student to enter the administrator password (the usual UAC prompt). Of course, we could just turn off UAC, but that would defeat the purpose of having it in Windows 7. On the other hand, we cannot really give the students local administrator privilege, as we are concerned that they will do some malicious stuff on the computers. Previously when we used Windows XP Professional running Visual Studio 2005, we had no problems. Kindly advise if there's any workaround for this. EDIT: Thanks for the answer guys. Mayank, your links may work for Visual Studio .Net, but it doesn't seem to work for Visual Studio 2010. Ryan, Tieson, I'm intrigued that you guys managed to get it working easily. FYI I don't manage the Group Policies, but I can get them changed if necessary. Any particular GP that I should be looking at? Suggestions to how to troubleshoot further why UAC is being invoked? At least now I know for sure that this is not supposed to be the default behaviour for Visual Studio 2010 so I'm going to keep digging for a solution. Will try running Procmon and see if i can find something..

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