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• Problems with merge replication

  - by jess

  Hi, We are developing a multi-user desktop application with users located in different countries. The platform is - .net 3.5, SQL Server 2008, WinForms. Now, my client has used the help of a DBA who has implemented merge replication. To facilitate replication, we made all our primary keys as GUID. Now, we are facing these issues with replication - subscribers expiration sometimes stops replication and we have found no clean way to re-add every change to db schema requires to poll the whole data all over again! This seems to be strange, what could be the problem here? Also, sometimes we have duplicate keys, and that too stops replication I am sure these issues can be resolved. Maybe, we have not gone the right way to implement. Can you suggest how to go about implementing. Or, is the above information enough to diagnose the problem?

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• SQL Server Express Uninstall / Enterprise Install Issue

  - by user19049

  I need help installing SQL Server 2005 Enterprise edition.I really need to remove the current SQL Server 2005.installation that is no longer on my Add/Remove software list but yet still installed on the machine. I tried to uninstall SQL Server Express / Developer Edition but it only removed it from my Add/Remove software list. It returned immediately but did NOT actually remove the product. (I'm now in a bad state.) i tried to install SQL Server 2005 Enterprise and its says I'm blocked as all components are already installed - but they are not. How can I remove all instance of previous one and install clean Enterprise edition on my server Thanks

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• Combine multiple DNS filtering result

  - by Martheen Cahya Paulo

  Several DNS servers provide filtering against different categories, mostly for the local government 'undesirable content', some for malware, and some for ads. What I want is to create/use a DNS server that compare against those filtering DNS servers and only provide the address if all the DNS server agrees. For example if DNS server G provide a clean, unfiltered result, DNS server N provide malware and/or pornography filter, and DNS server F provide ad filter, then G, N and F will only provide the same/similar answer if the query is not categorized as malware, pornography, or advertising. Thus, by creating a server M that only answer if all DNS server agree, M effectively filter against all those categories. Maybe it's possible to do this on DDWRT or Tomato, but if not, I would settle for a solution that can be run in Linux/Windows.

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• faster ( squid + apache httpd + apache tomcat )

  - by letronje

  We have a production setup where we have Squid in the front(caching images, js, css, etc) Apache httpd in the middle(prefork + mod_rewrite + mod_jk/AJP + mod_deflate + mod_php(few php pages)) Apache tomcat 5.5 at the end serving all the dynamic stuff. What would be the best way to reduce the overhead of having 3 servers in the request path ? Wondering if replacing httpd with a faster web server like nginx/lighttpd will help. httpd right now does the job of url rewriting(for clean urls) and talking to tomcat(via mod_jk) and compressing output(mod_deflate) and serving some low traffic php pages. What would be ideal replacement for httpd given that we need these features? Is there a way to replace (squid + apache) with a single entity that does caching well (like squid) for static stuff, rewrites url, compresses response and forwards dynamic stuff directly to tomcat ? heard abt varnish cache, wondering if it can help.

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• Mysql Master-ColdMaster

  - by enedebe

  I explain my case: I'm at Amazon AWS and I want to be fault tolerant on a entire region failure. My basic problem is to have the db in sync with 2 regions. My options: Master-Master (high lag) Hand made sync every 5 minutes Master-ColdMaster?! (copy on the fly but Master won't wait the other region commit) In my system we could afford loosing a piece of data (we're not a bank) the last inserts in the db, but we could not afford more than 10 minutes of downtime. The database is small and the level of inserts is low, and I wouldn't affect the normal usage waiting other region commit. Is the 3 solution posible? And the most important, once the primary fail how we can detect and change the rol between master-coldmaster -- coldmaster-master ? Is there any clean-mode to restore between failure? Thank's!

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• Video compression artifacts in Flash

  - by lvanderhart

  This only started happening in the past two days, which seems very odd to me. Everything worked flawlessly up until now, and I use my my computer as my primary TV. Flash video from Hulu and Amazon, for no apparent reason, now have lots of artifacts in them. Some scenes are ok, but some are completely scrambled and unwatchable. My connection is a 15mb fios, and bandwidth tests indicate my connection speed is ok. I've tried the latest production version of Flash, as well as the 10.1RC4. Same problem. Enabling or disabling hardware acceleration in Flash makes no difference (with the scrambling issue, quality is better overall with hardware). Using a different H264 codec doesn't clean up the issue, although the scrambling does look different. I'm kind of stumped. The only thing I can think of now is to reinstall windows, which is obviously a drastic step. Edit: Forgot to say: Windows 7, Athlon 64X2, Geforce GTS 250

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• How do you check Driver Verifier logs on Windows 7 after catching a faulty driver?

  - by Wolf

  I kept getting BSODs on a clean install of Windows 7 (plus updates), so I decided to run Driver Verifier. I had to select all drivers, since it didn't catch the culprit when I didn't include Microsoft drivers. I know it is not a hardware problem since everything is working fine on Linux and memtest86+ is not reporting any errors in the RAM (8 GB). This time, it caught the faulty driver and gave me a BSOD telling me so. Using WhoCrashed, I could verify what was the last error message with the parameters and the source. Yet, the source is always the kernel (ntoskrnl.exe) and the bugcheck this time was 0xC4 (0x85, 0xFFFFF9804429AFC0, 0x2, 0x11B948). After searching on the web, I found out "the driver called MmMapLockedPages without having locked down the MDL pages." As I am not developing any driver, this is of no use to me. However, I would like to know which driver caused Driver Verifier to trigger an alert, so I can either disable it, or rollback to a previous version in order not to get crashes anymore.

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• Installing Linux kernel 2.6.25.14 on RHEL 5.4

  - by aaron

  I have to install Linux kernel version 2.5.25.14 on a RHEL 5.4 server because of drive compatibility issues. I follow the RedHat "Building a Custom Kernel" instructions running the following: $ make mrproper $ make xconfig $ make clean $ make bzImage $ make modules $ make modules_install $ make install But I get a bunch of warnings like this: WARNING: No module ehci-hcd found for kernel 2.6.25.24, continuing anyway When I try to boot this kernel it is unable to mount the hard drive, and kernel panics on startup. As far as I can tell I'm using a standard configuration (I just accept the defaults and save a .config file). Is there something I'm missing? Thanks.

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• Why is hibernation still used?

  - by Moses

  I've never quite understood the original purpose of the Hibernation power state in Windows. I understand how it works, what processes take place, and what happens when you boot back up from Hibernate, but I've never truly understood why it's used. With today's technology, most notably with SSDs, RAM and CPUs becoming faster and faster, a cold boot on a clean/efficient Windows installation can be pretty fast (for some people, mere seconds from pushing the power button). Standby is even faster, sometimes instantaneous. Even SATA drives from 5-6 years ago can accomplish these fast boot times. Hibernation seems pointless to me when modern technology is considered, but perhaps there are applications that I'm not considering. What was the original purpose behind hibernation, and why do people still use it? Edit: I rescind my comment about hibernation being obsolete, as it obviously has very practical applications to laptops and mobile PCs, considering the power restrictions. I was mostly referring to hibernation being used on a desktop.

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• Moving mails from SBS 2008 to SBS 2011

  - by starchx

  we are going to upgrade server from SBS 2008 to a new hardware server with SBS 2011. Due to non-experience in Server Migration (eg, answer file), we have decided to choose Clean Install. We have 12 users so that's not too bad. The most challenge problem is to move over all the emails for each user, some user have 5GB inbox. The one method I know is to login to each user account and export the emails to PST file using Outlook 2007. Then connect to new SBS 2011 and import the PST into new inbox. Do we have any other better/quicker ways? Thanks

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• Unable to Boot from USB External Hard Drive

  - by Josh Stodola

  I recently upgraded my main development machine to Windows 7. This involved wiping out my primary boot drive (Windows XP 64-bit) and starting clean. Before I wiped it, I did a direct disk-to-disk copy to a big external hard drive I have. While I have been able to migrate most of the necessary files without any problems, I was wanting to boot from it today to check a few settings. I plugged in the hard drive, rebooted, changed the BIOS to boot from USB-HDD first. But, no mattter what I do, it always boots from my primary drive to Windows 7. I do not see any kind of error message or anything. How can I boot to Windows XP 64-bit on this external hard drive?

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• Windows 8.1 installation: Which drive is the F drive?

  - by sammyg

  I am doing a clean install of Windows 8.1 on an old PC. It was purchased as download from Microsoft Store and written to and booted from a USB flash drive. It went through all of these steps: Copying Windows Files Getting files ready for installation Installing features Installing updates Then at "Getting finished" I am stuck at this stupid dialog box. Please unplug the following external drive and click OK to restart your computer and finish installing Windows. F: How do I tell what physical drive this is? Can I drop to command prompt during installation? And is it safe to unplug it while powered on? There is no external hard drive connected, none that I can see. There is no USB or FireWire drive connected externally. I think it sees one of the internal drives as external... in some weird way?!

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• How do I create something like a negated character class with a string instead of characters?

  - by Chas. Owens

  I am trying to write a tokenizer for Mustache in Perl. I can easily handle most of the tokens like this: #!/usr/bin/perl use strict; use warnings; my $comment = qr/ \G \{\{ ! (?<comment> .+? ) }} /xs; my $variable = qr/ \G \{\{ (?<variable> .+? ) }} /xs; my $text = qr/ \G (?<text> .+? ) (?= \{\{ | \z ) /xs; my $tokens = qr/ $comment | $variable | $text /x; my $s = do { local $/; <DATA> }; while ($s =~ /$tokens/g) { my ($type) = keys %+; (my $contents = $+{$type}) =~ s/\n/\\n/; print "type [$type] contents [$contents]\n"; } __DATA__ {{!this is a comment}} Hi {{name}}, I like {{thing}}. But I am running into trouble with the Set Delimiters directive: #!/usr/bin/perl use strict; use warnings; my $delimiters = qr/ \G \{\{ (?<start> .+? ) = [ ] = (?<end> .+?) }} /xs; my $comment = qr/ \G \{\{ ! (?<comment> .+? ) }} /xs; my $variable = qr/ \G \{\{ (?<variable> .+? ) }} /xs; my $text = qr/ \G (?<text> .+? ) (?= \{\{ | \z ) /xs; my $tokens = qr/ $comment | $delimiters | $variable | $text /x; my $s = do { local $/; <DATA> }; while ($s =~ /$tokens/g) { for my $type (keys %+) { (my $contents = $+{$type}) =~ s/\n/\\n/; print "type [$type] contents [$contents]\n"; } } __DATA__ {{!this is a comment}} Hi {{name}}, I like {{thing}}. {{(= =)}} If I change it to my $delimiters = qr/ \G \{\{ (?<start> [^{]+? ) = [ ] = (?<end> .+?) }} /xs; It works fine, but the point of the Set Delimiters directive is to change the delimiters, so the code will wind up looking like my $variable = qr/ \G $start (?<variable> .+? ) $end /xs; And it is perfectly valid to say {{{== ==}}} (i.e. change the delimiters to {= and =}). What I want, but maybe not what I need, is the ability to say something like (?:not starting string)+?. I figure I am just going to have to give up being clean about it and drop code into the regex to force it to match only what I want. I am trying to avoid that for four reasons: I don't think it is very clean. It is marked as experimental. I am not very familier with it (I think it comes down to (?{CODE}) and returning special values. I am hoping someone knows some other exotic feature that I am not familiar with that fits the situation better (e.g. (?(condition)yes-pattern|no-pattern)). Just to make things clear (I hope), I am trying to match a constant length starting delimiter followed by the shortest string that allows a match and does not contain the starting delimiter followed by a space followed by an equals sign followed by the shortest string that allows a match that ends with the ending delimiter.

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• AWS EC2: How to determine whether my EC2/scalr AMI was hacked? What to do to secure it?

  - by Niro

  I received notification from Amazon that my instance tried to hack another server. there was no additional information besides log dump: Original report: Destination IPs: Destination Ports: Destination URLs: Abuse Time: Sun May 16 10:13:00 UTC 2010 NTP: N Log Extract: External 184.xxx.yyy.zzz, 11.842.000 packets/300s (39.473 packets/s), 5 flows/300s (0 flows/s), 0,320 GByte/300s (8 MBit/s) (184.xxx.yyy.zzz is my instance ip) How can I tell whether someone has penetrated my instance? What are the steps I should take to make sure my instance is clean and safe to use? Is there some intrusion detection techinque or log that I can use? Any information is highly appreciated.

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• Packaging python software with custom dependencies

  - by viraptor

  Hi, I'm looking for a good way to package a Python application that is going to be deployed on a Debian server. The application itself depends on some modules which are not included in base Debian repository, although they might be in the future. This creates some problems... I depend on some patches to those modules. If the original module gets installed one day, the application will break. However if I install everything I need in a virtualenv just for that application, I lose the ability to upgrade Python itself (in case of security updates). The third option would be to rename my fork of the upstream module and just treat it as a completely separate one. But that would mean changing the code (not much work, but it wouldn't be that clean / universal anymore). Are there any other options that I missed? Are there any pros / cons I didn't see in the solutions above?

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• Why does a Windows 7 installation grow so seriously and how to shring it?

  - by Ivan

  I store all my data and the most of applications (those legally available in "portable" versions) on drive D: and only use drive C: for the Windows system and some heavily integrated applications like MS Office, Visual Studio, Adobe Reader, Flash Player etc. When I was using Windows XP, 50 GiB drive C: was more than enough. Now, as I've mitigated to Windows 7, it hardly is. Yesterday as I've checked, 7 GiBs were free on drive C:. Then I've installed fresh Windows updates (which were just some tens of MiBs to download) and checked again: now there are only 2 GiBs free. Where have 5 GiBs gone? PS: Don't be surprised my system installation takes actually that much: I've got Visual Studio and SQL Server with complete offline documentation library, but that doesn't explain where does free space disappear on simple Windows updates. PPS: I use an augmented CCleaner version to clean my PC every day, so there are for sure no temporary internet files of recycle bin trash files taking the place.

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• Does Ubuntu Server have any sort of cron job to automatically clear /tmp?

  - by DWilliams

  I know it clears out /tmp on reboots, but I haven't been able to find any sort of cron job on my server that clears /tmp. I recently set up a script that writes lots of files to /tmp and my server usually goes several months between reboots so I'm concerned about it being cluttered. I've seen several other distros that have a tmpwatch script installed by default. Ubuntu's repository seems to have replaced tmpwatch with tmpreaper. Is there any mechanism in place on Ubuntu (8.04 currently, soon to be upgraded to 10.04 when I get around to it) to clean up temp files on a server that doesn't regularly reboot or do I need to install tmpreaper?

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• Screen is black at login screen if display driver is enabled

  - by Amir Rachum

  I have a Lenovo x200 and recently its screen didn't work, so I took it to a repair lab. The guy told me they replaced the screen inverter. I powered up the laptop and the ThinkPad logo was shown, so I was happy. When I got home the computer would boot up, then instead of the logon screen, I got a black screen. Went to safe mode, disabled the display adapters, reset the computer, and I got a clean boot. Then I tried to reinstall the drivers, and it just led to the same condition. My video card is (from device manager): Mobile Intel(R) 4 Series Express Chipset Family. Now my laptop works as I'm working with display drivers disabled, but without display drivers I can't watch movies, etc. Any solution to this problem? Edit: I plugged in an external monitor and it works on it with display drivers enabled. However, it does not find the laptop monitor.

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• How To Remove A Broken Program From the Programs and Features List In Windows 7?

  - by Itai

  On a Windows 7 64-bit desktop, there is a program on the Programs and Features list (Control Panel\All Control Panel Items\Programs and Features) that refused to uninstall. The error obtained is: Error 1723. There is a problem with this Installer package. A DLL required for this install to complete could not be run I suspect filer were deleted or corrupted. The big problem is that the program refused to install itself over the broken version. So how to I manually clean up the list of installed program?

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• Removing emails from all mailbox with certain text in subject

  - by Doug Luxem

  So, we had an errant program kick off about 15,000 emails to our users. I have our spam filters now blocking these on the edge until that gets resolved, but now I would like to clean our our users' mailboxes for them. Is there anyway with Exchange 2007 to remove all emails with certain text in the subject line? It would need to be a partial match because the subject changes slightly for each email. I am trying to do this with Forefront's manual scan job + content filter, but it does not seem to like partial matches on the subject.

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• Data Archiving vs not

  - by Recursion

  For the sake of data integrity, is it wiser to archive your files or just leave them unarchived. No compression is being used. My thinking is that if you leave your files unarchived, if there is some form of corruption it will only hurt a smaller number of files. Though if you archive, lets say all of your documents, if there is even the slightest corruption, the entire archive is unrecoverable. So whats the best way to keep a clean file system, but not be subject to data corruption.

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• Removing emails from all mailboxes with certain text in subject

  - by Doug Luxem

  So, we had an errant program kick off about 15,000 emails to our users. I have our spam filters now blocking these on the edge until that gets resolved, but now I would like to clean our our users' mailboxes for them. Is there anyway with Exchange 2007 to remove all emails with certain text in the subject line? It would need to be a partial match because the subject changes slightly for each email. I am trying to do this with Forefront's manual scan job + content filter, but it does not seem to like partial matches on the subject.

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• Installing win xp media center 2005

  - by wdizz

  I have a Dell 710 XPS H2C running Vista Business, I wish to clean install Win XP media center 2005. I wiped my hard drive with Wipe Drive Pro and proceeded to install Win XP, the install starts and goes thru the various prompts but when it comes to 'installing windows' I get a blue screen that flashes briefly (to fast to get the error code) and then reboots. This happens with any XP system disk (iv'e tried 4), but it installs Vista, 7 or Linux with no problems. I contacted Dell Support who have yet to give me any solutions to resolve the problem. Is there anyone out there with any ideas please.

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• new ubuntu server installation - java server not receiving packets

  - by James

  I have developed a Java server which listens for UDP packets which come from mobile devices. At the moment, it works correctly if I run my Server on my windows PC. I can receive and respond to the UDP packets sent from my phone (over 3g, not wifi). However, I am trying to run the Server on a different computer which I found lying around my house. I have basically done a clean install of Ubuntu Server edition, updated it, installed the java run time environment and configured port forwarding to allow connections on the appropriate port. I have also tried to disable the firewall. The problem is, it doesn't appear as if the server is receiving any packets and I've exhausted my brain thinking on how to solve/debug the problem. Can anyone suggest to me what the problem might be? or more likely something I can do to help me find out more information about what is going wrong.

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• Handling UTF-8 with BOM in HTTP

  - by Alois Mahdal

  Say I have a script which at some point serves a plain text file as a content (right after "\n\n"). These files are provided by users, but I can expect they will be UTF-8. So I hard-wire Content-Type: text/plain; charset=UTF-8. But while I can teach users to save everything in UTF-8, I can't be very sure that the files will be without BOM ("\xEE\xBB\xBF"), as at least on Windows, this is not very clearly distinguished in common plain text editors and not every one of them uses the same default. So what about these files created on Windows, where they may/may not start with BOM? Should/will server or UA get rid of this debris for me? Or is it my task to prepare clean UTF-8, i.e. open each file and check whether BOM needs to be removed?

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