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• Are there any reasons to duplicate table in the same database ?

  - by bob

  Let says we have several MySQL server, one master and some slaves. A member table which contains more than 5.000.000 peoples. Are there any reasons (performance, atomicity, etc..) to use duplicate tables like member_1, member_2, member_3 and then switch randomly when doing operation on it ? (especialy SELECT query) ?

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• Modifying the initrd.img to run additional binaries in a PXE booted RHEL 6

  - by Charles Long

  I am trying to add additional automation to our existing RHEL 6 (or Oralce's implementation thereof) PXE install process by running a script in the %pre section of my kickstart config that call hpacucli, HP's raid device configuration binary. My approach has been to modify the PXE served initrd.img. I've unpacked the initrd.img and copied in the required libraries, binaries, and scripts but when the system boots using the modified initrd.img, the modified /lib (and /lib_64) are moved aside to /lib_old and /lib is linked to the /mnt/runtime/lib. How can I change this configuration so that the /lib is not moved (unlikely) or required libraries are available in the runtime /mnt/runtime/lib? To test and confirm this I've been able to get the install process to move to the 6th virtual console, which allows me to see errors, and then open a shell (a useful debugging mechanism). %pre exec /dev/tty6 2 /dev/tty6 chvt 6 /bin/sh

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• How can I find all hardlinked files on a filesystem?

  - by haimg

  I need to find all hardlinked files on a given filesystem. E.g. get a list of files, each line contains linked pairs, or triplets, etc. I understand more or less how to do it, one needs to create a dictionary keyed by inode for all files/directories on a filesystem, exclude "." and ".." links, and then indodes with more than one name are hardlinks... But I hope that maybe a ready-made solution exists, or someone already wrote such a script.

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• Cable management between multiple racks

  - by RippieUK

  I am in the planning phase of re-cabling our 5 racks in one of our offices and I would like to ask for some guidance on how you go, or would go about managing cables that goes between racks. In our situation we have 5 racks where the furthest to the right is our main patch panel for 300 floor ports. The rack next to it is our main comms rack where main switches and ISP routers are located. the other 3 racks next to the comms rack then all need to connect back to the main comms rack. I am not sure if a 48 port patch panel in each rack would be any good for this scenario? mainly because i am not sure this can be linked back to the main switch with only 1 cable. Would a 48 port switch in each rack be better as you can uplink those back to main switch? Or should we just run cables between racks back to the main switch? Hope someone can offer some guidiance. Thx

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• Using e-mail address as user name for SMTP and POP3

  - by PeterMmm

  I have a exim4 setup as SMTP. My user naming schema is to name all mail users for this server as m001, m002, m003, ... and then redirect to a real e-mail address with virtual domains. How can I allow my users to authenticate with exim to send mail using either their system user name (m001) or the email address ([email protected])? User login information for m001 are stored in linux system files (passwd, shadow). They are linked thru entries in a virtual address table for each domain that this server can serve: # /etc/exim4/virtual/example.com m001: [email protected] m002: [email protected] m003: [email protected] The same can be applied to qpopper ?

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• Firewall GPO not applying despite being enumerated by gpresult

  - by jshin47

  I have a need to open up the admin$ share on all of my domain's client PC's and I am trying to do so using group policy. I defined computer policy for Windows Firewall with Advanced Security in a policy object linked to the appropriate container and added the appropriate rules. However, they are not being applied! I feel like I have tried all of the obvious steps: I've checked gpresult and the resulting set of policy is the way that I would expect it to look. I've gpupdate /force and gpupdate /sync on a few client computers, but no matter what I do they don't seem to respond to my changes. I know that other computer policies in the GPO are being applied so it is strange that these are not. I have also disabled exceptions on clients in the firewall GPO, but that doesn't seem to be applying either. Here is a screenshot of the firewall.cpl from a client: Basically, although other options in the same GPO ARE applied for computer policy, the firewall settings seem to be ignored.

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• Internet Explorer defaults to 64-bit version

  - by Tim Long

  My IE8 has suddenly started defaulting to the 64-bit version. I have no idea how or why this has happened, but I suspect it might be linked to the Browser Choice Screen that Microsoft was recently forced to display by EU law. However, many web sites will not display correctly in IE8 x64 (eg. sites that use Adobe Flash or Microsoft Silverlight). I have the 32-bit version of IE pinned to my taskbar and if I launch it manually, everything is fine. But when I click on a URL from another program and IE is not already running, then the 64-bit version gets launched. This really messes with programs like BBC iPlayer which rely heavily on Adbobe Air and Flash. So, how do I get IE8 32-bit version to be the default version again? I've tried using the "default programs" control panel and that doesn;t make any difference (in fact, it doesn't give the choice between x84 and x64 versions, it just lists "internet explorer").

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• Changing Internet connection on ISA Server 2000

  - by garyb32234234

  Hi We are getting a new internet connection installed and will need to unplug the old one and connect this to our ISA Server 2000. Will this be a simple swap out job? We will be given a new ip, which i know i will have to enter into the external network card TCP/IP page. I will also be given the default gateway to enter. The ISP engineer said we may have to reset the ARP? cache, if we dont know how we will have to reset the ISA server? Has anyone any experience? The current connection is with the same ISP but it was owned by the business park were we are located and they linked up an ethernet port to what i assume is their own router. Hope you can help, i know that ISA 2000 is somewhat less easy to use than the newer versions.

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• Break a hard link of a file in use

  - by Stebi

  I used hard links to merge duplicated files on my SSD (space is still precious) and now have a weird problem. Common files like msvcr110.dll got hard linked. Now I want to delete a program which has this file in its installation directory. But I cannot because this file (on another location) is used by a currently running application (don't know which) and windows doesn't allow me to delete this file because it's in use. I can rename the file but it still points to the same file, so not possible to delete it. Is there any way to break a the hard link of a file which is currently in use? I currently use a trash folder where I move those files to so I can delete the directory structure of program to be deleted. But I'd like to get rid of this leftover (although it doesn't take much space as it's a hard link).

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• "No such file or directory" when the file is there

  - by Arlaud Agbe Pierre

  I'm trying to run XPDF on a linux (probably red hat) OVH shared server. I've managed to have ftp ssh access and put the 64 bits binaries onto a folder. The problem is : even though the files are there with the right permissions, if I try running it I'm getting a file not found problem (I'm thinking about a missing link..) Long story short : jurisedi@ssh1:~/xpdf$ file pdftotext pdftotext: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), stripped jurisedi@ssh1:~/xpdf$ ./pdftotext -ovh: jurisedi@ssh1:~/xpdf$: No such file or directory Any ideas ?

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• Design Question

  - by dturner71

  Can I have two independent Connection servers attached to the same vCenter server? Here's my scenario. I'm setting up View 4 to provide desktops to two seperate Windows domains that are on different IP subnets seperated by a firewall. One cluster of physical servers, one vCenter server, linked clones. As I understand it View Connection server has to be a member of a Windows domain in order for quickprep to work. So the way to provide desktops to both Windows domains is to have a Connection server in each one right? Then open ports in the firewall so the Connection server from the other subnet can communicate with vCenter. Any reason why this won't work? Or is there a better way to accomplish it?

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• IE9 HANGS: jquery based webapp hanging ONLY with IE9

  - by Daniele B

  I'm stuck on this issue since days... This is the site I'm talking about. It is a webapp which makes large use of backbone, visualsearch, jquery plugins. This website is not working at the moment with IE8, but it's fine that it works with IE9...if just it would! What happens is that the website hangs when loaded ONLY with IE9 and (this is bizarre!) if the profiler tool of IE9 developer tools is ON it doesn't!! It also happens to oher people (I was notified of that) so I'm pretty sure it's not an issue linked to my browser settings. It makes me think about an error which has something to do with delays, or iterative functions which, in presence of profiler, are forced to delay bte cycles and so to leave free time slots to other functions which render the page. I can update with more details if needed. thanks.

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• Switch flooding when bonding interfaces in Linux

  - by John Philips

  +--------+ | Host A | +----+---+ | eth0 (AA:AA:AA:AA:AA:AA) | | +----+-----+ | Switch 1 | (layer2/3) +----+-----+ | +----+-----+ | Switch 2 | +----+-----+ | +----------+----------+ +-------------------------+ Switch 3 +-------------------------+ | +----+-----------+----+ | | | | | | | | | | eth0 (B0:B0:B0:B0:B0:B0) | | eth4 (B4:B4:B4:B4:B4:B4) | | +----+-----------+----+ | | | Host B | | | +----+-----------+----+ | | eth1 (B1:B1:B1:B1:B1:B1) | | eth5 (B5:B5:B5:B5:B5:B5) | | | | | | | | | +------------------------------+ +------------------------------+ Topology overview Host A has a single NIC. Host B has four NICs which are bonded using the balance-alb mode. Both hosts run RHEL 6.0, and both are on the same IPv4 subnet. Traffic analysis Host A is sending data to Host B using some SQL database application. Traffic from Host A to Host B: The source int/MAC is eth0/AA:AA:AA:AA:AA:AA, the destination int/MAC is eth5/B5:B5:B5:B5:B5:B5. Traffic from Host B to Host A: The source int/MAC is eth0/B0:B0:B0:B0:B0:B0, the destination int/MAC is eth0/AA:AA:AA:AA:AA:AA. Once the TCP connection has been established, Host B sends no further frames out eth5. The MAC address of eth5 expires from the bridge tables of both Switch 1 & Switch 2. Switch 1 continues to receive frames from Host A which are destined for B5:B5:B5:B5:B5:B5. Because Switch 1 and Switch 2 no longer have bridge table entries for B5:B5:B5:B5:B5:B5, they flood the frames out all ports on the same VLAN (except for the one it came in on, of course). Reproduce If you ping Host B from a workstation which is connected to either Switch 1 or 2, B5:B5:B5:B5:B5:B5 re-enters the bridge tables and the flooding stops. After five minutes (the default bridge table timeout), flooding resumes. Question It is clear that on Host B, frames arrive on eth5 and exit out eth0. This seems ok as that's what the Linux bonding algorithm is designed to do - balance incoming and outgoing traffic. But since the switch stops receiving frames with the source MAC of eth5, it gets timed out of the bridge table, resulting in flooding. Is this normal? Why aren't any more frames originating from eth5? Is it because there is simply no other traffic going on (the only connection is a single large data transfer from Host A)? I've researched this for a long time and haven't found an answer. Documentation states that no switch changes are necessary when using mode 6 of the Linux interface bonding (balance-alb). Is this behavior occurring because Host B doesn't send any further packets out of eth5, whereas in normal circumstances it's expected that it would? One solution is to setup a cron job which pings Host B to keep the bridge table entries from timing out, but that seems like a dirty hack.

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• deploying AV via GPO only to workstations

  - by jeremy

  We have a small (100 machines) Windows domain running Server 2008R2. We use Symantec Endpoint Protection 12.1 I want to have GPO deploy the AV software to client machines automatically, but only to client workstations, not to servers, which run a different software. I've set it up before using a GPO linked to the domain mycompany.local and it works, but it deploys the AV software to ALL machines on the domain, including my servers. I can create an OU in active directory for Servers, and perhaps create one for client machines too, but I'd rather not have to go and move new domain members from the default under Computers into a different folder. How can I use GPO to deploy this AV software only to workstations on our network, and not to servers?

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• MySQL asking a user for SUPER privilege to perform a delete.

  - by Fran

  Hello, When trying to do a delete operation on a table, mysql reports the following error: Error code 1227: Access denied; you need the SUPER privilege for this operation. However, my user has this privilege granted for all tables in the schema: GRANT ALL PRIVILEGES ON myschema.* TO 'my_admin'@'%' How come it asks me for SUPER privilege for a delete? Thanks in advance.

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• MYSQL to MSSQL migration

  - by Paul

  I have to move a MYSQL Database to MSSQL. I'd like to know if there's a tool that could automate this process a bit, at least for the tables and views.

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• Creating a file server - How can I use a large VHD file in Hyper-V? (700GB)

  - by barfoon

  Hey everyone, After a few discussions (here, here, and here), I am still unable to create a simple VM that will be used as a fileserver hosted on my Hyper-V box. I have created a fixed 700GB SCSI drive (.vhd file), as I have learned an IDE drive of this size is not possible. Not to sound too cynical, but its blown me away at how much trouble its been to create a large amount of space and start using it. What is the best way to create a fileserver with a drive of this size hosted on Hyper-V Server 2008, and how can I get it going??? Inclusion of OS, driver, integration tools etc, anything you feel is required would be greatly appreciated. Extra information I am using the stand-alone version of Hyper-V server, and not Windows Server 2008. I have tried loading the Linux Integration Tools (linked in the comments of the last link above) onto a SUSE 11 VM and the installation fails, the machine cannot see the vhd at all. Thanks very much,

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• way to back up sql server 2005 database to just get the data and objects

  - by Caveatrob

  I'm trying to do a nightly backup of a SQL Server 2005 database to get the leanest, smallest file that includes all the table data, stored procedures, views, and functions. I'm downloading and saving this daily in case the server isn't available and I need to just get some data out. I don't care about the logs or any other parts of the DB but the data, procs, tables, and functions. What's the easiest way to get just this information backed up?

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• Sparsity Failure

  - by Lijo

  Hi Team, In the context of data warehouse, could you please explain "Sparsity Failure" of aggregate tables? It would be great if you can explain it with product sales in a store; aggregated by week. It could be easily understood if it is having schema as well as sample data. Thanks Lijo

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• OpenLdap 2.4 on centos 6 doesn't listen on port 636

  - by Oliver Henriot

  I have an openldap 2.4 server on centos 6 whose confg I copied from those I have running under openldap 2.3 servers on centos 5 machines. On openldap 2.3, specifying TLSCACertificateFile, TLSCertificateFile and TLSCertificateKeyFile with correct values makes the server listen on port 636. This is not the case on the openldap 2.4 setup. I have configured it with loglevel -1 but I have not seen any clue as to what might be wrong and reading the openldap 2.4 manual doesn't indicate if any of the other TLS related parameters are now mandatory. I don't think so though because if I run the service manually, using "# /usr/sbin/slapd -u ldap -h "ldap:/// ldaps:/// ldapi:///"", the server does listen on port 636 and I can query it using "ldapsearch -H ldaps://myserver:636". Is there something I am missing to get the server to listen on port 636 without having to always launch it manually? Is this linked to centos 6 or openldap 2.4? Thank you. Cheers,

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• Windows webserver monitor and notifier service

  - by WestDiscGolf

  I'm looking for a software tool/service, preferably opensource/free, which will run on a Windows 2003 r3 standard server which will monitor bandwidth usage of all the websites it's hosting (a break down by site would be very useful) and also send out notifications if IIS or another service (as defined) stops responding. A web interface to see the bandwidth usage and other details would be very useful. I've personally got a vps which does this kinda of monitoring but I believe this is more linked into the host itself. Does anyone have any pointers? All help is appriciated. Cheers

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• Optimize SAP SQL Server database using DTA

  - by Danilo Brambilla

  Is it safe to optimize a SQL Server 2005 SAP R/3 database using Database Tuning Advisor raccomandatations? We are experiencing very low performance on a dedicated SAP database because of intense read operations ad the db and DTA suggest to create about 25 indexes and 100 stats. I am not an expert of SAP and I am quite surprised to see that this database has about 56.000 tables and 6500 views (120 GB of data). Thank you all for help

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• IRC Services with failover support?

  - by insertjokehere

  I run a single server (call it 'server A') IRC 'network', and thank to the generosity of some friends, I have been given a second server ('server B') that I can run an IRCd on in order to provide redundancy in case server A crashes. This is fine, I can set up a round-robin DNS with the servers linked. The problem I have is what to do about services? Does anyone know of a way to get the services to 'fail over' in case of a server failure? Eg, Server A starts off running the services, but suddenly crashes. Server B detects this and starts its own copy of the services (ideally with the same configuration and data as the services on Server B) One solution that comes it mind is to write a bot that each server runs, that sit in a channel periodically checking if the bot from the other server is in the channel. If it is, then all is well. If not, then failover. I would prefer not to have to code this myself though We are currently using Unreal IRCd and Anope services on Linux

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• Dynamic Subdomains

  - by crash

  On my new site I want to have dynamic subdomains. I'm trying to make it so that the subdomains use the same web root as the main domain, all under a single CodeIgniter installation. For example, subdomain.example.com would lead to example.com/subdomain, which is actually example.com/index.php/subdomain. I've already the DNS, virtual hosts set up but I"m getting caught up on the .htaccess. The effect of the linked htaccess is that when navigating to any subdomain, it gets caught up in an infinite loop. (Error log after one request.) It's the same effect for www., which should just resolve to the main domain.

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• How to record desktop session with sound on Moblin?

  - by Moblin Newbie

  I have tried to record my desktop session with sound on a netbook running Moblin, but I can't seem to be able to record sound. xvidcap just says error accessing /dev/dsp. Are there some options I should pass to xvidcap? Should I use some other recording application? Update: I am using the latest xvidcap (1.1.7) and have read the FAQ. Unfortunately Moblin' gnome-volume-control looks nothing like what is linked to from the xvidcap FAQ; there is no way to to set or even look at the details the screenshot shows, as far as I know. alsamixer shows pulseaudio is used, if that gives anyone any clues. The device is Acer Aspire One.

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