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Articles indexed Wednesday December 19 2012

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  • Slow loading Magento Commerce homepage

    - by Matt
    I have recently changed by website and it is really loading slowly :- dancemidisamples.com here is a report http://www.webpagetest.org/result/120906_78_ANK/ As far as I can tell the is a issue with this section of code <link rel="icon" href="http://www.dancemidisamples.com/skin/frontend/base/default /favicon.ico" type="image/x-icon" /> <link rel="shortcut icon" href="http://www.dancemidisamples.com/skin/frontend/base/default/favicon.ico" type="image/x-icon" /> <script type="text/javascript"> //<![CDATA[ var urlSkinsite='http://www.dancemidisamples.com/skin/frontend/em0040/default/'; //]]> </script> <!--[if lt IE 7]> <script type="text/javascript"> //<![CDATA[ var BLANK_URL = 'http://www.dancemidisamples.com/js/blank.html'; var BLANK_IMG = 'http://www.dancemidisamples.com/js/spacer.gif'; //]]> </script> <![endif]--> Does anyone have any ideas, people have told me it my DNS but it has a 49ms response rate according to http://www.webpagetest.org/result/120906_78_ANK/1/details/cached/ We are hosted with rackspace so I dont see how it could be the server. Its a dedicated server not cloud hosted

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  • Launching a PHP daemon from an LSB init script w/ start-stop-daemon

    - by EvanK
    I'm writing an lsb init script (admittedly something I've never done from scratch) that launches a php script that daemonizes itself. The php script starts off like so: #!/usr/bin/env php <?php /* do some stuff */ It's then started like so in the init script: # first line is args to start-stop-daemon, second line is args to php-script start-stop-daemon --start --exec /path/to/executable/php-script.php \ -- --daemon --pid-file=$PIDFILE --other-php-script-args The --daemon flag causes the php script to detach & run as a daemon itself, rather than relying on start-stop-daemon to detach it. This is how it's (trying to) stop it in the init script: start-stop-daemon --stop --oknodo --exec /path/to/executable/php-script.php \ --pidfile $PIDFILE The problem is, when I try to stop via the init script, it gives me this: $ sudo /etc/init.d/my-lsb-init-script stop * Stopping My Project No /path/to/executable/php-script.php found running; none killed. ...done. A quick peek at ps tells me that, even though the php script itself is executable, its running as php <script> rather than the script name itself, which is keeping start-stop-daemon from seeing it. The PID file is even being generated, but it seems to ignore it and try to find+kill by process name instead. $ ps ax | grep '/path/to/executable/php-script.php' 2505 pts/1 S 0:01 php /path/to/executable/php-script.php --daemon --pid-file /var/run/blah/blah.pid --other-php-script-args 2507 pts/1 S 0:00 php /path/to/executable/php-script.php --daemon --pid-file /var/run/blah/blah.pid --other-php-script-args 2508 pts/1 S 0:00 php /path/to/executable/php-script.php --daemon --pid-file /var/run/blah/blah.pid --other-php-script-args 2509 pts/1 S 0:00 php /path/to/executable/php-script.php --daemon --pid-file /var/run/blah/blah.pid --other-php-script-args 2518 pts/1 S 0:01 php /path/to/executable/php-script.php --daemon --pid-file /var/run/blah/blah.pid --other-php-script-args $ cat /var/run/blah/blah.pid 2518 Am I completely misunderstanding something here? Or is there an easy way to work around this?

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  • MSMQ on Win2008 R2 won't receive messages from older clients

    - by Graffen
    I'm battling a really weird problem here. I have a Windows 2008 R2 server with Message Queueing installed. On another machine, running Windows 2003 is a service that is set up to send messages to a public queue on the 2008 server. However, messages never show up on the server. I've written a small console app that just sends a "Hello World" message to a test queue on the 2008 machine. Running this app on XP or 2003 results in absolutely nothing. However, when I try running the app on my Windows 7 machine, a message is delivered just fine. I've been through all sorts of security settings, disabled firewalls on all machines etc. The event log shows nothing of interest, and no exceptions are being thrown on the clients. Running a packet sniffer (WireShark) on the server reveals only a little. When trying to send a message from XP or 2003 I only see an ICMP error "Port Unreachable" on port 3527 (which I gather is an MQPing packet?). After that, silence. Wireshark shows a nice little stream of packets when I try from my Win7 client (as expected - messages get delivered just fine from Win7). I've enabled MSMQ End2End logging on the server, but only entries from the messages sent from my Win7 machine are appearing in the log. So somehow it seems that messages are being dropped silently somewhere along the route from XP or 2003 to my 2008 server. Does anyone have any clues as to what might be causing this mysterious behaviour? -- Jesper

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  • How to conform to update-rc.d with LSB standard?

    - by user34881
    This is a migrated question from stackoverflow, as I was told, this is the place for it to be. http://stackoverflow.com/questions/2263567/how-to-conform-to-update-rc-d-with-lsb-standard I have set up a simple script to back up some directories. While I haven't had any problems setting up the functionality, I'm stuck with adding the script to rcX.d dir's using update-rc.d. My script: #! /bin/sh ### BEGIN INIT INFO # Provides: backup # Required-Start: backup # Required-Stop: # Should-Stop: # Default-Start: 0 6 # Default-Stop: # Description: Backs up some dirs ### END INIT INFO check_mounted() { # Check if HD is mounted } do_backup() { if check_mounted; then # Some rsync statements. fi } case "$1" in start) do_backup ;; restart|reload|force-reload) echo "Error: argument '$1' not supported" >&2 exit 3 ;; stop|"") # No-op ;; *) echo "Usage: backup [start]" >&2 exit 3 ;; esac : Using update-rc.d backup start 10 0 6 . I get the following warnings and errors: update-rc.d: warning: backup start runlevel arguments (none) do not match LSB Default-Start values (0 6) update-rc.d: warning: backup stop runlevel arguments (0 6.) do not match LSB Default-Stop values (none) update-rc.d: error: start|stop arguments not terminated by "." The syntax I try to use is the following: update-rc.d [-n] <basename> start|stop NN runlvl [runlvl] [...] . Google wasn't that helpful at finding a solution. How can I correctly set up a script and add it via update-rc.d? I'm using Ubuntu 9.10. UPDATE Using update-rc.d backup start 10 0 6 . stop 10 0 . the error disappears. The warnings about default values persists: update-rc.d: warning: backup start runlevel arguments (none) do not match LSB Default-Start values (0 6) update-rc.d: warning: backup stop runlevel arguments (0 6 0 6) do not match LSB Default-Stop values (none) It even is added to the appropiate rcX-dirs but it still does not get executed...

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  • Can't see progress of rolling back SPID with KILL WITH STATUSONLY

    - by BradC
    I have a SPID on SQL 2005 that shows in Activity Monitor as "ROLLBACK" mode (because a transaction log filled up, not because it was manually killed). I tried to see how much time it has left to roll back with a KILL 115 WITH STATUSONLY but it just said "Status report cannot be obtained. Rollback operation for Process ID 115 is not in progress." Can I safely issue a "KILL 115" so that I can see the rollback status? Does this actually do anything on a spid currently in rollback?

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  • Network Bridging for WiFi-to-Ethernet in linux

    - by shakaran
    It is possible Network Bridging for WiFi-to-Ethernet in linux instead of Ethernet-to-Ethernet? I have a CentOS 6.3 machine. I am using KVM and I want perform a brigde for virtualize more machines. This machine is connected only via wireless connection and it doesn't have a ethernet connection. So, I did a bridge over the WiFi interface like: # cat /etc/sysconfig/network-scripts/ifcfg-br0 DEVICE="br0" NM_CONTROLLED="yes" ONBOOT=yes TYPE=Bridge BOOTPROTO=none IPADDR=192.168.1.50 PREFIX=24 GATEWAY=192.168.1.1 DNS1=8.8.8.8 DNS2=8.8.4.4 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System br0" Then I edit my wireless conection like: # cat /etc/sysconfig/network-scripts/ifcfg-mywireless ESSID="mywireless" MODE=Managed KEY_MGMT=WPA-PSK WPA_ALLOW_WPA2=yes CIPHER_PAIRWISE=CCMP CIPHER_GROUP=CCMP TYPE=Wireless #BOOTPROTO=none #IPADDR=192.168.1.50 #PREFIX=24 #GATEWAY=192.168.1.1 #DNS1=8.8.8.8 #DNS2=8.8.4.4 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="Auto mywireless" UUID=874***** ONBOOT=yes LAST_CONNECT=1355923469 BRIDGE=br0 After, I restart the network: # /etc/init.d/network restart Shutting down loopback interface: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface Auto_mywireless: Error: Unknown connection: 874***** [FAILED] Bringing up interface br0: [ OK ] But as you can see, it show a error. My ifconfig output shows now: # ifconfig br0 Link encap:Ethernet HWaddr 6E:20:AD:CE:D8:AB inet addr:192.168.1.50 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::6c20:adff:fece:d8ab/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:67 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:6393 (6.2 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:432 errors:0 dropped:0 overruns:0 frame:0 TX packets:432 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:62433 (60.9 KiB) TX bytes:62433 (60.9 KiB) ra0 Link encap:Ethernet HWaddr 00:22:F7:2B:87:E5 inet addr:192.168.1.42 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::222:f7ff:fe2b:87e5/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:46 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:487894880 (465.2 MiB) TX bytes:148136473 (141.2 MiB) virbr0 Link encap:Ethernet HWaddr 52:54:00:5B:30:9A inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:70 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:5838 (5.7 KiB) But this doesn't give internet connection and I loss access to 192.168.1.50. So, it is possible setup this networking bridge WiFi-to-Ethernet?

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  • Error with TextMate 2 --shell-escape and gnuplot 10.8.2

    - by Manuel
    I have had TM 1.X since a long time ago, but a week ago I updated my system to Mountain Lion 10.8.2 and installed TM2. The problem is that I write with LaTeX, and sometimes I use gnuplot for the graphs (I installed gnuplot with macports). But now it doesn't work because the --shell-escape doesn't work, this is the error message I get: Package pgfplots Error: Sorry, the gnuplot-result file '"untitled 2.pgf-plot.table"' could not be found. Maybe you need to enable the shell-escape feature? For pdflatex, this is ' pdflatex -shell-escape'. You can also invoke ' gnuplot .gnuplot' manually on the respective gnuplot file.. And then, looking around I discovered that it's not just gnuplot but everything which needs --shell-escape. Question What happened? How can I get TM have the correct rights so this works? It worked right in Snow Leopard with TM 1.5.

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  • Is there any way of preventing .csv files being converted into excel format

    - by Kevin Trainer
    I'm trying to work with an automated testing tool which can use .csv files as its data sourse. After saving a notepad file containing a number of fields and data seperated by commas as .csv it appears to have been converted to an excel file. When I run the test, only the first line of values is identified and can be run within the automated test. Not sure if this is expected with the testing product (www.badboy.co.au), but just wondered if there was a way of preventing excel from taking control of the .csv file? Any helpfull feedback would be great.

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  • Windows 8 doesn't start up after installation

    - by Raj BD
    I have a DELL INSPIRON n5110 machine running Windows 7 Home Premium 64-bit. It has 6GB of RAM and 500 GB hard disk capable to run any Windows and Linux system. And I recently attempted to install Windows 8 in the machine. Installation goes fine and smooth until the final stage when windows is done installing and GETS DEVICES READY. When GETTNG DEVICES READY reaches about 60%, the screen goes blank with the machine running. After a while it reboots. And after the new Windows Logo with dotted circles are done showing up, the screen goes blank again (when we'd expect login screen to show up). There is not even a cursor. I can see the HARD DISK ACTIVITY LED blinking but nothing shows up in the screen. I've tried CLEAN INSTALL several times. The DVD is fine, it installed and worked well in my friends' laptop PCs. I tried installing both PRO version and ENTERPRISE version and both 32-bit and 64-bit. But the problem was same everytime. Finally, I had to reinstall Windows 7 which installed and ran without any problem. The problem, we can guess, is GRAPHICS perhaps. I have Intel SandyBridge Graphics Mobile Chipset (Intel HD Graphics 3000). But if Windows 7 and Linux distrubutions like Mint and BackTrack can run on the machine, why on earth, would Windows 8 not run?

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  • Centralize proxy settings for all the application on my workstation

    - by Leonardo
    As a consultant, I used to work at different clients premises. It happens frequently that most of them has specific proxy settings, but not all the application I have installed on my laptop get settings from system preferences, for allowing me to change settings in one place. Some of them bypass system preferences completely, proposing their own mask for entering specific data such as username, host and password. I am looking for a convenient and not much intrusive way to share a common access point on which I could enter data, and maybe persist them. An 'automatic' switching would be ideal, for example based on some network identification, but there's no problem for me to enter data manually. I am not an IT expert, but to explain myself clearly, I am looking for a solution like .pac file is for browsers. Relevant OS I am using are MacOSX and Linux (Ubuntu).

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  • How to virtualize a qnap NAS with virtualbox?

    - by l1zard
    I want to deploy an owncloud based cloud service at a qnap NAS. And i need to test it before we can use it on the production system. there is a french site which made it possible to download a virtualbox disk image but the documentaion about how to use this image is very poor or in french, so i can't read it. Has anybody ever been successfully virtualized a qnap NAS and could tell me exactly how this can be acclomlish?

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  • Understanding Windows 8 Recovery options

    - by stuffe
    Background: I am preparing a PC that I am sending to a relative abroad, who has little or no internet access, and next to no sensible options for getting IT support should anything go wrong. As such I am trying to provide a full set of recovery options such that they are able to reinstall the OS with minimum fuss or assistance if required. The PC is a brand new Acer laptop that came with Windows 7 pre-installed (and an associated recovery partition) and a free upgrade to Windows 8. I have installed Windows 8 from scratch performing a format and clean install from media I burned from the official download. The existing Windows 7 recovery partition is still there, and I can still boot from it. I have created recovery DVDs of that in case it is ever lost. Here are my recovery options so far. I can perform a factory reset of Win 7 via the recovery partition I can perform a factory reset of Win 7 via burned recovery DVDs I can re-install Windows 8 cleanly from a DVD All of these are useful, but not what I want, because the first 2 methods use Win 7, and still fill the machine with crapware, and the latter doesn't provide for any post-install customisation and software installation. So, I am looking to see what other options are available to perform a Windows 8 recovery that will be more than a simple install. I am aware that Win8 comes with some useful refresh tools: Refresh your PC - Re-install Win 8 over the top of your existing installation, recovering from any Windows corruption etc. I can run this from my current install, although it says some files are missing that will be provided by me install or recovery media, which seems to be code for stick your install DVD in, and it starts after I do that - unfortunately for this particular laptop you need to specify a particular WIFI driver or the install bombs out part way through with IRQL errors, and this refresh method skips the part where you can load a driver, so it's no use to me. I think I can fix this by creating a custom recovery image using the recimg.exe command but it takes hours to complete so I haven't tried it yet. Reset your PC - Perform a full install and lose all your files. Again it needs my Install media inserting before it will do anything, but then it provides an error (will include later when I recreate it...) Now, these recovery options look useful (in principal, although both are fail for me) but they rely on having a working system to access the tools, which leads me to the last option, of making a Recovery USB drive. I have made a recovery drive, and it should perform loads of useful things, including copying my WIN7 recovery partition to the drive, providing the above refresh and reset options, providing other troubleshooting options and also the ability to restore from a custom image, only none of them seem to work for me. Creating the Recovery Drive - the option to include my recovery partition is greyed out. The partition exists and works fine, why will it not copy it? Refresh - I imagine this would have the same issues as I described before, but this is moot because when I try it says that the "drive where Windows is installed is locked, please unlock the drive and try again" with no info on what that means and how to do it. Restore - Again, probably pointless as I can just use the DVD, but it also errors: "unable to reset your PC. A required drive partition is missing" System Restore - should let me roll back a bad driver etc as per normal in Windows, only it simply says "To use system restore you must specify which windows installation to restore. Restart this computer, select an operating system, and select system restore" ?!?! System Image Recovery - this seems to be offering to restore from a Windows system image, but this is deprecated in Windows 8, although you can still make one if you use the Windows 7 Backup tools, however the resultant file is too large to put on the USB stick as it's FAT formatted, and would be a massive stack of DVDs anyway. So useless. It would be nice it it would work with the custom recovery image you can use with the refresh command, but there seems no option to do this. Automatic Repair - some diagnostics, which seem useless as it happily tells me it can't fix my problem, even though I have none. Command Prompt - yay, this works! What on earth do I want to use it for... Had any of the above worked, it might be useful, but as any form of install still requires you to have the DVD, and any form of custom recovery image also requires you to have either a massive stack of DVDs or an NTFS formatted backup device in addition to the recovery drive, it sort of ruins the point. It doesn't seem rocket science. I want to create a bootable USB drive that I can refresh Windows over an existing install with, perform a clean reinstall to a bare system, or recovery a customised image with existing apps installed. If anyone can point me in a direction that allows me to make a single recovery drive do these all these things, I would appreciate it. I have a 32Gb USB3 thumb drive that I bought for this very purpose, but it's seems to be fighting to let me do anything useful. At this rate I will be making a DriveImageXML recovery stick and dumping the OS with that, which I know works, but isn't so elegant as using the proper tools..

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  • Would shell command join cause out of memory?

    - by Hancy
    I have two file to join. FILE 1: a A1 a A2 a A3 ... c C1 c C2 ... FILE 2: a feature1_of_a a feature2_of_a ... a featureN_of_a ... ... c feature1_of_c c feature2_of_c ... after join, i could get File like this: A1 feature1_of_a A2 feature1_of_a A3 feature1_of_a A1 feature2_of_a A2 feature2_of_a A3 feature2_of_a ... A1 featureN_of_a A2 featureN_of_a A3 featureN_of_a ... In order to do that: i wrote shell command join -11 -21 -o1.2,2.2 file1 file2. But the problem is: number N might be huge. So if join read all feautre of a into memory at once, memory might not be enough. I don't know how join is implemented. WQould the momery become a problem? If so, is there any way to get what I want?

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  • How to add commands of windows to local shell of XShell 4

    - by dylanninin
    XShell is a very powerful tools to ssh remote computers such as Unix/Linux. And it has built some internal commands for you to run within your Windows. Xshell:\> help Internal Commands: new: Creates a new session. open: Opens a session or the session dialog box. edit: Opens the Session Property dialog box for a session. list: Lists information of all available sessions. 'ls' and 'dir' do the same. cd: Changes the current working directory. clear: Clears the screen/address/command history. help: Displays this help. '?' does the same. quit: Quits Local Shell. 'exit' does the same. ssh: Connects to a host using the SSH protocol. telnet: Connects to a host using the TELNET protocol. rlogin: Connects to a host using the RLOGIN protocol. sftp: Connects to a host to transfer files securely. ftp: Connects to a host to transfer files. External Commands: ipconfig: Configures TCP/IP network interfaces. ping: Sends ICMP ECHO_REQUEST packets to network hosts. tracert: Prints the route packets take to network host. netstat: Displays current protocol statistics and current TCP/IP network connections. nslookup: Resolves a hostname to IP address. For more information, type 'help command' for each command. ex) help telnet But these commands are limited, so how to add commands of windows to local shell of XShell 4

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  • Find out the size of a .tar.gz archive in the terminal without unpacking

    - by Sven
    I have a 32GB .tar.gz archive and I'd like to know the size of the files if I unpack this compressed archive. I'd like to avoid unpacking the archive first and than use e.g. du. Is it also possible to find out the size of the contained files without unpacking the compressed archive (on a Linux and/or MacOSX system)? For another archive I know, that it also contains .tar.gz files. Is it also possible to calculate the size of the unpacked archives that are contained within an archive? (for example by setting a level to which the "unpacking" should be simulated?)

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  • Macbook Air trackpad not clicking nor moving cursor, but multi-finger gestures are working

    - by GJ.
    This has been happening to me several times recently just after I disconnect my MBA from a USB hub (for an external keyboard and mouse). The internal trackpad just won't move the cursor, not does it generate clicks. However, strangely enough, multi-finger gestures are still working, e.g. scrolling with two fingers. Only after a system restart does the trackpad return to normal (until the next time..)

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  • Steganography software

    - by dag729
    Do you know some good (better if FOSS and cross-platform) steganography software that runs on GNU/Linux? The features I'm searching are: steganography software (better if FOSS and cross-platform) it must run on GNU/Linux must hide data inside audio/video/image files support of additional cryptography I already use a cryptographic software, but I want to use a steganographic one as an addition to it. Any suggestions will be appreciated, thanks a lot in advance!

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  • ISA bus on newer computers

    - by Kevin Ivarsen
    Are there companies that sell new computers that support old ISA bus expansion cards? We have an aging computer running DOS that operates some machinery via an ISA interface board. Updated versions of this board (e.g. PCI, USB) are not available, and I am concerned about the long-term reliability of the 8+ year old computers we currently keep around as backups. If these newer ISA-capable machines exist, are there any general gotchas to be aware of in terms of compatibility with older expansion boards, ability to run DOS, etc.?

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  • The Chemistry of Snowflakes [Video]

    - by Jason Fitzpatrick
    Snowflakes start out as tiny bits of dust high in the atmosphere and end up drifting down to us as intricate water crystals. Check out this video to see the process start to finish. Courtesy of the American Chemical Society and Bytesize Science, we’re treated to a well explained and illustrated journey from the beginning of the snowflake formation process until the end. [via Neatorama] How to Access Your Router If You Forget the Password Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor

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  • Real Life Pixar Lamp Can’t Get Enough Of Human Interaction

    - by Jason Fitzpatrick
    This curious lamp, powered by an Arduino board and servo motors, is just as playful as the on-screen counterpart that inspired its creation. The New Zealand Herald reports on the creation of the lamp, seen in action in the video above: The project is a collaborative effort by Victoria University students Shanshan Zhou, Adam Ben-Gur and Joss Doggett, who met in a Physical Computing class. The lamp’s movements are informed by a webcam with an algorithm working behind it. Robotics and facial recognition technology enable the lamp to search for faces in the images from its webcam. When it spots a face, it follows as if trying to maintain eye contact. How to Access Your Router If You Forget the Password Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor

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  • How to Access Your Router If You Forget the Password

    - by Chris Hoffman
    Routers protect their web interfaces, where you can configure their networking, parental control, and port forwarding settings, with a username and password. These default passwords can be changed to protect the router’s settings. If you’ve forgotten a router’s password – or if you acquired a used router and don’t know its password – there’s a way to reset the password. You may also be able to forward ports without knowing the password. Image Credit: tnarik on Flickr How to Access Your Router If You Forget the Password Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor

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  • Perl fête ses 25 ans, que pensez-vous de l'évolution du langage de programmation ?

    Perl fête ses 25 ans que pensez-vous de l'évolution du langage ? Perl (Practical Extraction and Report Language) a un quart de siècle cette semaine. Le langage de programmation dérivé des langages de scripts shell, sed, awk et du langage C avait été lancé en version 1.0 le 18 décembre 1987 par Larry Wall. Le langage avait été présenté comme une alternative aux utilitaires de traitement de texte Unix Sed et Awk. C'est un an plus tard après la sortie de la version 2.0 que Perl va réellement décoller. En 2000, Perl sort en version 6 et est entièrement réécrit à partir de zéro, tout en concevant ses principes de base. Le langage interprété est surtout apprécié...

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  • IBM : "les ordinateurs pourront voir, sentir, toucher, gouter et entendre" d'ici 5 ans, Big Blue livre ses prédictions "5 in 5"

    IBM : « les systèmes informatiques pourront voir, sentir, toucher, gouter et entendre » d'ici 5 ans Big Blue livre ses prédictions « Five in Five » Comme il est de coutume en chaque fin d'année, IBM vient de livrer ses cinq prédictions sur l'évolution de la technologie au cours des cinq années à venir. Big Blue lors de son événement « Five In Five » a publié sa vision d'un futur ou les dispositifs informatiques seront dotés des cinq sens. Ils seront capables de voir, sentir, toucher, gouter et entendre. Le toucher : un téléphone sera capable de reproduire une sensation du toucher De nos jours, les technologies haptiques et graphiques utilisées dans le domaine ...

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  • « SQL Server peut depuis longtemps adresser les Workloads les plus critiques », entretien avec le chef de produit du SGBD

    SQL Server : « Nous sommes capables depuis longtemps d'adresser les Workloads les plus critiques » Retour avec le chef de produit France sur la version 2012 du SGBD Véritable pierre angulaire avec Windows Server 2012 du renouvellement de la gamme professionnelle de Microsoft, SQL Server 2012 est à un tournant à l'heure où l'IT et ses bases de données se transforment. Big Data, Cloud Computing, BI, données déstructurées : autant de défis (parmi tant d'autres) à relever pour les bases « traditionnelles » qui doivent également continuer à répondre aux besoins ? eux aussi ? traditionnels de leurs utilisateurs installés....

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  • ???? Oracle11g ????????? No.2 - v$database.CURRENT_SCN

    - by Todd Bao
    «????Oracle 11g ???????»???????????,?11.2.0.3.0?????: select current_scn from v$database union all select current_scn from v$database; ??????????SCN,??????11.2.0.1.0???????????SCN?????? ??,????11.2.0.1.0????,11.2.0.3.0????X$KCCDI(V$DATABASE?????,??CURRENT_SCN??)??,?????????SCN? ----------------------------------------------------| Id  | Operation            | Name               |----------------------------------------------------|   0 | SELECT STATEMENT     |                    ||   1 |  MERGE JOIN CARTESIAN|                    ||*  2 |   FIXED TABLE FULL   | X$KCCDI            ||   3 |   BUFFER SORT        |                    ||   4 |    VIEW              | VW_JF_SET$6E0AEE5B ||   5 |     UNION-ALL        |                    ||   6 |      FIXED TABLE FULL| X$KCCDI2           ||   7 |      FIXED TABLE FULL| X$KCCDI2           |---------------------------------------------------- ??????11.2.0.3.0???????SQL??v$database????current_scn????????:???????X$KCCDI???dicur_scn(current_scn)??????? a. ???:????union all,???????,??????????X$KCCDI2(V$DATABASE??????)?VIEW????,??X$KCCDI?X$KCCDI2????,???X$KCCDI??,??: SYS@fmw//Scripts> run  1  select current_scn from v$database  2  union all select current_scn from v$database  3  union all select current_scn from v$database  4* union all select current_scn from v$databaseCURRENT_SCN-----------    5074384    5074385    5074385    50743854 rows selected. ??,X$KCCDI?????????,??????????SCN??????SCN????????“?”SCN? b. ???:???????,??: SYS@fmw//Scripts> run  1  select current_scn,status from v$database,v$instance  2  union all  3* select current_scn,status from v$database,v$instanceCURRENT_SCN + STATUS----------- + ------------------------    5075463 + OPEN    5075464 + OPEN2 rows selected. c. ???:?????????: SYS@fmw//Scripts> run  1* select a.current_scn,b.current_scn from v$database a,v$database bCURRENT_SCN + CURRENT_SCN----------- + -----------    5078328 +     50783291 row selected. ????UNION ALL?????? d. ??,???X$KCCDI??????????????????“??”??=D,????????X$?????????$???,???????,????V$DATABASE?????????????????: SYS@fmw//Scripts> run  1  select dicur_scn from x$kccdi  2* union all select dicur_scn from x$kccdiDICUR_SCN--------------------------------508218350821842 rows selected. SYS@fmw//Scripts> run  1* select a.dicur_scn,b.dicur_scn from x$kccdi a,x$kccdi bDICUR_SCN                        + DICUR_SCN-------------------------------- + --------------------------------5082913                          + 50829141 row selected. ??? Todd Bao ??,???????????,?????????SCN,????V$DATABASE.CURRENT_SCN?,???????“next scn”? ×??,???demo????11.2.0.3.???

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