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  • SQL Server: Statements vs. Batches vs. Transactions vs. Connections

    - by Sleepless
    My question is simple: What are the differences / similarities / cardinalities between Transactions Batches Connections and Statements in SQL Server? As far as I understand a connection is a single communications channel between a SQL Server instance and a client within which collections of statements grouped as batches are executed. A batch is either implicitly or explicitly mapped to one or several transactions. Is this correct?

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  • Multiple virtual VLAN interfaces on single NIC (Debian)

    - by RayQuang
    I'm trying to setup multiple virtual interfaces with VLAN's on a single NIC. I'm running Debian Squeeze. Currently this is my /etc/netowrk/interfaces auto eth0.10 iface eth0.10 inet dhcp This gives me a working connection, however I'm not sure how to configure several like these on a single NIC so I can use multiple external IP's. I have tried aliasing the VLAN's like so: iface eth0.10:1 But that was not successful and it said failed to bring up interface. And suggestions would be greatly appreciated :)

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  • Cannot connect to Windows SBS Essentials 2011

    - by Michael Ervin
    Using the Launchpad from the Mac, trying to connect to Server Essentials 2011, no one is able to actually log in. The little login wheel keeps spinning and spinning. Anyone have any ideas what might be keeping us from logging in? On the mac side, we are using 10.6 and 10.7, but both are exhibiting the same problem. I also cannot connect to the server by remote desktop connection within the local network. HELP!

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  • Local Apache on Windows XP not finishing page requests

    - by asgeo1
    I have Apache 2.2.11 installed locally on my Windows XP (SP3) dev machine, which I setup about 3 months ago. I have just started having a strange problem in the last few week. Apache is serving some basic PHP applications like phpMyAdmin. When I make a page request, Apache appears to not finish serving all resources for that page. Firefox shows the "Transferring data from servername..." message, and the page never completes. The same problem happens in Internet Explorer too. I can sometimes tell which resource it is waiting on, because most of the page will render except for some image or similar resources. (Not sure why Firebug doesn't show this) It doesn't have the problem every page request - for page requests where most of the resources are cached in my browser, the page request will work with no problems. Or pages that are very light will work with no problems. However, if I "hard" refresh the page, I will have this problem (probably because it is requesting all page resources) Does anyone know what this could be? It is so strange that it has only just started happening - and I did not make any changes to my system (that I am aware of) I tried playing with the Apache ThreadsPerChild setting, but it did not seem to make a difference. UPDATE: I have been doing some more tests. I have been serving the most basic of pages, just a plain HTML file: <html> <body> <h1>testing</h1> </body> </html> If I request this page multiple times in a row, AND each request occurs immediately after the previous has completed, then 50% of the time the request will time out. However, if I put a 1-2 second gap between requests, then there is no problem. This correlates to what I have observed when the brower requests a real application page. When the browser has nothing cached, then all of the page resources are requested from the browser in a short amount of time - this appears to trigger the problem. UPDATE2: Nathan Long has helped me understand the issue a little better with the server-status page (see below). It is weird, it is like the server has a hickup sending data to the client. The client sits there waiting forever for data that never arrives. Closing the client process does not terminate the connection on the server - the server still has active threads for each previously attempted connection, but they just sit there - not sending any data and never terminating. (even though the client is now closed) Only a restart of the server seems to terminate them.

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  • the kvm's terminal works weirdly

    - by Lai Yu-Hsuan
    I connect to a remote machine from the local machine and use virsh console to enter the virtual machine. I don't know how to exactly depict how it works. Normally it works well, but when I run VIM: Then it can't be recovered unless I cut the connection up: It's very hard to work with a broken terminal. Any advice? My terminal works well on my local machine and the remote machine in which the virtual machine runs.

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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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  • Bridging wlan0 to eth0

    - by user46127
    On arch Linux, I would like to mainly have eth0 (connected to bridged router) share the connection recieved from wlan0, Ive read tutorials but I'm not command sabby as other users are and don't completely understand. I would appreciate some help! Ty!

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  • Simple switch ports state monitoring tool

    - by Florent Courtay
    My users keep unplugging our meeting rooms computers network connection. As i can't check the computers every time a meeting ends, i'd like to find a tool, preferably running on windows, that can monitor some cisco switch ports state, and every time a cable is being unplugged, send me an email. I know that some monitoring solutions can do that already, but i wonder if something simplier (and preferably cheap / free of course !) exists.

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  • Virtual PC with Multi Monitors

    - by user41013
    Hi I have recently intalled Virtual PC and was wondering if it possible to make use of both of my monitors with it. I have managed to get a pseudo multi screen effect by connecting using Remote Desktop connection, but this isn't really what i wanted. Is this possible? Thanks

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  • Virtual PC with Multi Monitors

    - by user34710
    Hi I have recently intalled Virtual PC and was wondering if it possible to make use of both of my monitors with it. I have managed to get a pseudo multi screen effect by connecting using Remote Desktop connection, but this isn't really what i wanted. Is this possible? Thanks

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  • amazon ec2 ubuntu with gitlab and nginx - cant load?

    - by thebluefox
    Ok, so I've spooled up an Amazon EC2 server running Ubuntu, and then followed the instructions below to install GitLab; http://doc.gitlab.com/ce/install/installation.html The only step I've not been able to complete is running the following check on the status; sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production I get the following error; rake aborted! Errno::ENOMEM: Cannot allocate memory - whoami Which I presume is becuase my EC2 is just running a free tier setup, so isn't that well spec'd. Regardless, I've been trying to access this through my browser. I've set up the elastic IP and pointed my domain at it (for the purpose of this, lets say its git.mydom.co.uk). Doing a whois on this domain shows me its pointing to the right place. For some reason though, I get the "Oops, Chrome could not connect to git.mydom.co.uk". Now - for a period of time I was getting the Nginx holding page (telling me I still needed to perform configuration). This though disappeared after removing the default file from /etc/nginx/sites-enabled/ (after reading this could be issue on a troubleshooting page). Since then, I've had nothing, even when I symlinked the file back in from /sites-available. I've tried changing the owner of the git.mydom.co.uk file sat inside /sites-enabled and /sites-available to www-data, as suggested here, but I could only change the permission of the file in /sites-available, and not the symlinked one in /sites-enabled. The content of this file is as follows; upstream gitlab { server unix:/home/git/gitlab/tmp/sockets/gitlab.socket; } server { listen *:80 default_server; # e.g., listen 192.168.1.1:80; In most cases *:80 is a good idea server_name git.mydom.co.uk; # e.g., server_name source.example.com; server_tokens off; # don't show the version number, a security best practice root /home/git/gitlab/public; # Increase this if you want to upload large attachments # Or if you want to accept large git objects over http client_max_body_size 20m; # individual nginx logs for this gitlab vhost access_log /var/log/nginx/gitlab_access.log; error_log /var/log/nginx/gitlab_error.log; location / { # serve static files from defined root folder;. # @gitlab is a named location for the upstream fallback, see below try_files $uri $uri/index.html $uri.html @gitlab; } All the paths mentioned in here look ok...I'm about at the end of my knowledge now!

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  • How to configure fetchmail to send messages from remote smtp server to Gmail?

    - by ifesdjeen
    I've been trying to setup email forwarding through fetchmail from remote smtp server to Gmail account, although messages are constantly coming to my local address and accessible via "mail" command. SMTP connection works perfectly, but emails do not go anywhere. System: debian, fetchmail Config: poll smtp.server protocol imap username “user” password “pass” smtpname “[email protected]” ssl Thank you!

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  • How could I resolve the following configuration on airport express?

    - by poz2k4444
    I've tried to configure my airport express in order to make a private network and also get access to internet, the thing is my linksys just has broken and all I have is the airport express, I've managed my DHCP to provide IP directions, but the internet connection is not working, is it something with the NAT?? or how can I access internet with my configuration, if the airport is reset to factory settings everything works fine, so, what is the problem?? My computer is going to be DHCP and DNS server

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  • Windows Server 2003 port forwarding

    - by Vitor Braga
    Using the "netsh interface portproxy" I added a port forwarding to a Windows Server 2k3. The command "netsh interface portproxy show all" shows the added forwarding. On the other hand, any client connecting to the incoming port will receive a "connection refused" message. netstat also doesn't show the incoming port as listening. The machine firewall is disabled. There is any other way to setup port forwarding on Windows or debugging tips?

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  • VPS host can't send email to Google and Yahoo Mail

    - by mandeler
    Hi, I got a new VPS setup and I'm wondering why I can't send emails to yahoo and gmail. Here's the error in /var/log/maillog: 00:43:00 mylamp sendmail[32507]: o45Gh0nc032505: to=, ctladdr= (48/48), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=120405, relay=alt4.gmail-smtp-in.l.google.com. [74.125.79.27], dsn=4.0.0, stat=Deferred: Connection refused by alt4.gmail-smtp-in.l.google.com What seems to be the problem?

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  • ssh connectivity issue

    - by achal tomar
    I have a CentOS 5.5 server hosted in a remote data center. I usually access this server from a Red Hat Enterprise Linux 5 server using the ssh command. Now my organization has implemented a proxy server, this is not allowing me to connect to the VPS server. I see the following error using the command root@<ip address>:-: ssh: connect to host <ip address> PORT 22: connection refused. Can anybody help me with this issue?

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  • Tomcat maximum threads

    - by Clinton Bosch
    I understand that setting the maximum number of connections available in a connection pool should be the same as your maxThreads configured for your Tomcat server (which correlates to the number of requests that can be handled) For tomcat the default is 200, I assume there is a maximum that you can safely configure for your Tomcat server before things start getting out of control, which I assume is also governed by the resources of the machine it is running on. I am trying to get an understanding of the size of maxThreads that people are using with success, is 1000 too big?

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  • direct http to https on certain pages?

    - by Elliott
    Hi below is some code I added to my .htaccess code how can I add certain pages to be re-directed to https? such as login.php & login.html also if the user types in www. they get a "untrusted connection" as the SSL is only valid without the www. how could I fix this? Thanks RewriteEngine On RewriteCond %{HTTPS} off RewriteCond %{REQUEST_URI} /login.html RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

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  • Samba 'include' a per user config script

    - by cb0
    It is possible to use the include = /somepath/%u.smb.conf in the global section to call a script /somepath/cb0.smb.conf if the user cb0 connects to the samba server. Unfortunately this does not wotk for me because testparm alway gives me Can't find include file /somepath/.smb.conf When I connect to the server I can enter a username and pass but it alway rejects the connection. I'm using Samba Version 3.2.5 How can I achieve to load a custom user script depending on the user that is connecting ?

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  • windows server 2003 cannot accept connections

    - by Seb
    Hi everyone, I am running a Windows Server 2003 OS and am noticing that no one is able to connect to the machine through Remote Desktop. I have gone through the Terminal Services Configuration to make sure that we had the RDP-Tcp connection enabled and I've checked to see that the server was listening to port 3389. Are there any other options since I've tried to ping into our host server with no results. Thanks in advance.

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  • Vista ICS with ubuntu?

    - by user25427
    I have still have dial-up(cant afford highspeed) and I am trying to configure my desktop with vista to share that connection with Ubuntu Ive got it all setup but ubuntu wont get on the internet at all. Can yall help me with this problem.

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