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Articles indexed in November 2012

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• If you were starting today, what would you choose? [closed]

  - by WebDevDude

  If you were launching a new app today, with all the choices what would you choose? Cloud Hosting (Heroku, AppFog) VPS Hosting (just about anybody) Dedicated Servers (The Planet, RackSpace, etc.) I know this can be a very subjective question, but let's just go with the broad strokes here. Lets say you had an app, you don't know how it's going to do, but you want to be prepared for if it does take off, what would you go with?

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• How do I get a hold of the Reply-To header and remunge it in postfix

  - by Mikhail

  I have a legacy application that emails via php. 5% of the emails aren't going through. The solution is to route all email through a fancy verified mail server like Amazon's SES. I am having some trouble implementing this functionality. It seems this guy had a similar problem. My question is where in postfix can I set a filter that will take as input the the message headers, so that I can manually set the From field and the Reply-To field to [email protected] and [email protected], respectively. Where whatever_php_wants is dictated by the php program and the users registration email. I know where to set the noreply portion, but I don't know the exact place in postfix's configuration files where I can intercept complete emails and pass them to a script. Edit So I want emails to look like: FROM: [email protected] REPLY-TO: the_users_address@their_email_service.com

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• Website pages very slow to load on first access

  - by Merianos Nikos

  I have a production web server that makes sites to be very slow when load for first time. After the first time all connections are normal and fast. In the following screen you can see the first test I have run for a random site in my server: and here you can see the result of the second time request: As you can see there is a big change in the second load of the same page. Here is the page load time graph: My problem is that I don't really know anything about Red Had Linux server, and also I don't know where can I start. Can somebody to help me ? I like to find out the solution for the long time "wait" in connection. I know that my question is very minimal, but you can always ask me to give you information about the server.

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• ZFS: Redistribute zvol over all disks in the zpool?

  - by growse

  Is there a way in which ZFS can be prompted to redistribute a given filesystem over the all of the disks in its zpool? I'm thinking of a scenario where I have a fixed size ZFS volume that's exported as a LUN over FC. The current zpool is small, just two 1TB mirrored disks, and the zvol is 750GB in total. If I were to suddenly expand the size of the zpool to, say, 12 1TB disks, I believe the zvol would still effectively be 'housed' on the first two spindles only. Given that more spindles = more IOPS, what method could I use to 'redistribute' the zvol over all 12 spindles to take advantage of them?

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• How to mount vfat drive on Linux with ownership other than root?

  - by Norman Ramsey

  I'm running into trouble mounting an iPod on a newly upgraded Debian Squeeze. I suspect either a protocol has changed or I've tickled a bug, which I don't know where to report. I'm trying to mount the iPod so that I have permission to read and write it. But my efforts come to nothing: $ sudo mount -v -t vfat -o uid=32074,gid=6202 /dev/sde2 /mnt /dev/sde2 on /mnt type vfat (rw,uid=32074,gid=6202) $ ls -l /mnt total 80 drwxr-xr-x 2 root root 16384 Jan 1 2000 Calendars drwxr-xr-x 2 root root 16384 Jan 1 2000 Contacts drwxr-xr-x 2 root root 16384 Jan 1 2000 Notes drwxr-xr-x 3 root root 16384 Jun 23 2007 Photos drwxr-xr-x 6 root root 16384 Jun 19 2007 iPod_Control $ sudo umount /mnt $ sudo mount -v -t vfat -o uid=nr,gid=nr /dev/sde2 /mnt /dev/sde2 on /mnt type vfat (rw,uid=32074,gid=6202) $ ls -l /mnt total 80 drwxr-xr-x 2 root root 16384 Jan 1 2000 Calendars drwxr-xr-x 2 root root 16384 Jan 1 2000 Contacts drwxr-xr-x 2 root root 16384 Jan 1 2000 Notes drwxr-xr-x 3 root root 16384 Jun 23 2007 Photos drwxr-xr-x 6 root root 16384 Jun 19 2007 iPod_Control As you see, I've tried both symbolic and numberic IDs, but the files persist in being owned by root (and only writable by root). The IDs are really mine; I've had the UID since 1993. $ id uid=32074(nr) gid=6202(nr) groups=6202(nr),0(root),2(bin),4(adm),... I've put an strace at http://pastebin.com/Xue2u9FZ, and the mount(2) call looks good: mount("/dev/sde2", "/mnt", "vfat", MS_MGC_VAL, "uid=32074,gid=6202") = 0 Finally, here's my kernel version from uname -a: Linux homedog 2.6.32-5-686 #1 SMP Mon Jun 13 04:13:06 UTC 2011 i686 GNU/Linux Does anyone know if I should be doing something different, or If there is a workaround, or If this is a bug, where it should be reported?

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• How can I restore VM on a new Hyper-V server?

  - by jaloplo

  I was working gladly with my VM on my local Hyper-V server. But, after installing some updates on the host the system only show the famous blue screen. I couldn't start my host so I reinstalled it and configured as new Hyper-V server. My VM was in a another disk to prevent this happening but I don't know how to add it as a new VM on new server. In addition, this VM has various snapshots so, how can I add this VM to my new Hyper-V server? UPDATE: I can't do Export/Import because my server crashed before I can't do it.

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• Failover tmpfs mirroring. Am I doing it right?

  - by user45286

  My goal is to have a certain directory to be available as tmpfs. There will be some modifications during server uptime in this dir and those modifications must be synced to non-tmpfs persistent dir on HDD over rsync. After server boot the latest version from non-tmpfs persistent dir must be moved to tmpfs and rsync syncing to be started. I'm afraid that rsync will erase non-tmpfs backup if tmpfs dir will be empty.. I'm doing it in this way right now: create tmpfs partition in /etc/fstab cat /etc/rc.local (pseudocode) delete "tmpfs rsync" cronjob from /var/spool/cron/crontabs if there is any cp -r /path/to/non-tmpfs-backup /path/to/tmpfs/dir append /var/spool/cron/crontabs with "tmpfs rsync" cronjob What do you think?

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• laptop motherboard "shorts" when connected to adapter

  - by Bash

  Disclaimer: I'm sort of a noob, and this is a long post. Thank you all in advance! summary: completely dead laptop with no signs of life whatsoever (suddenly, for no apparent reason) Here's the deal: Lenovo Y470 (only a few months old with no water or shock damage). It stopped working suddenly (no lights, no sound, even when connecting adapter with or without battery). I tried a different adapter (same electrical rating), but no luck. I disassembled the thing completely, and tried plugging in the adapter and looking for signs of life with all different combinations of components installed (tried all combinations of RAM, CPU, USB power cords, screen, etc plugged in). no luck. Then, I noticed (as I was plugging in the adapter to try for the millionth time) that there was a "spark" for an instant when I first connect the adapter to the power jack. The adapter's LED would then flash (indicating it isn't working or charging). So, I thought the power jack has a short of some sort (due to bad soldering or something). Scanned virtually every single component on the motherboard, and tested the power jack connections with a multimeter. No shorts or damage to anything on the entire motherboard. Now I'm thinking I need to replace the motherboard. But, my actual question: What does this "shorting" when connecting the adapter signify? (btw, the voltage across the power connections and current through it drop to virtually zero when the adapter is connected and "sparks", and they stay that way). The bewildering thing is that there are no damaged components, and the voltage across adapter terminals returns to normal after I disconnect it (so it's not damaged). Please take a look at the pictures (of the motherboard's power connection and nearby components) and see if I'm missing something completely obvious... Links to pictures and laptop and motherboard model: pictures on DropBox Motherboard model: LA-6881P Laptop model: Lenovo IdeaPad Y470

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• Suggestion to change my Laptop RAM DDR3

  - by SP Gounder

  My Vaio VPCEA1BGN has Memory Type: DDR3 [2GB] PC3-10600 DDR3 [1GB] PC3-8500, DDR3 (non-ECC). There is no extra free slot now. I am planning to change one ram to 4GB. which one RAM i should remove now. I am still confused over the ECC types. Any suggestion while i am buying the ram?. I am looking into Corsair or Transcend. Maximum It can hold 8GB [2*4GB] The Crucial scan tool gave the Report as: http://www.crucial.com/systemscanner/viewscanbyid.aspx?id=28AC5F1531D926C3 I am using Win7 Professional 64Bit.

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• Software to store my password on a crypted file and access it through another password

  - by Fire-Dragon-DoL

  I'm looking for a software that allows me to store some passwords in something like "a text file", access it through a password, read my passwords if required and close it again. I want something really straightforward, double click on file, right click "Add new password", add password, description and close. The file must be really secure, I'll store all my passwords there. I know about some command line solutions but I want my setup to be really fast on reading. Do someone know if such a software exist and can point me in the correct direction? I would like to find it freeware, but I'm ok with some low cost tools too.

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• How can I chainload a USB drive from GRUB2?

  - by magic.plane

  I'm using GNU GRUB version 1.99-12ubuntu5, booted over the network using PXE. I used grub-mknetdir to generate the GRUB image and directory tree, which I'm serving on a TFTP server using Tftpd32 in Windows. I've put the latest version of Clonezilla on my USB drive using Tuxboot. Right now, in GRUB's CLI, using ls lists only the (pxe) device, even if the USB drive is plugged in before the computer is on. Is there any way I can chainload Clonezilla on my USB from GRUB, which is booted over the network?

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• Is bigger capacity ram faster then smaller capacity ram for same clock and CL?

  - by didibus

  I know that bigger capacity hard-drives with the same RPM are faster then smaller capacity hard-drives. I was wondering if the same is true for ram. Given two ram clocked at 1600mhz and with identical CLs: 9-9-9-24. Is a 2x8 going to perform better then a 2x4 ? Note that I am not asking if having more ram will improve the performance of my PC, I'm asking if the bigger capacity ram performs better. Thank You.

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• Can't do more than one activity at a time after switching modems

  - by vallorn

  I had to replace the Motorola 2210 DSL modem that I got when I signed up for AT&T DSL Direct a few years ago. The modem kept randomly restarting and it eventually gave out on me. I am assuming overheating was the cause here because it was almost too hot to touch. In any case, I replaced it with a Netgear DM111PSP. It works fine but I can't do more than one activity at a time with it. If my wife is watching Netflix, there is a noticeable delay/latency when trying to view web sites. It's even worse if I try to play an on-line game while she's streaming; the game is basically unplayable. The odd thing is, the only other activity I can do while she's streaming is stream another Netflix show myself. There is no delay when doing that, no buffering either. I'm not a networking guy so maybe there is an explanation for it but I find that kind of odd. I've tried using QoS through my Buffalo N600 wireless router and it doesn't seem to help. With the old Motorola modem, she could be watching Netflix while I play a game and everything worked just fine. Is there anything I can check or reconfigure possibly on the modem that would account for this? Should I just ditch the Netgear and get another modem instead? I have the Netgear modem connected to the Buffalo router in a bridged mode. Its the same exact setup as I had with the Motorola and as far as I can tell, it's not the router that is the cause.

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• How to add programs in context menu on desktop at one context name?

  - by tonni

  Hello I'm searching for answer how to put programs (not program) in context menu of desktop at one context name? Example: I want to create new context name which can be extendable to put inside more programs. That is like "New" or "View" that show as more options after using it. Here is what i tried (and is working when you want to put one program to desktop): I created in registry "New Folder" with name of some programs (i.e. "notepad") inside of this location HKEY_CLASSES_ROOT\Directory\Background\shell\ Inside of new created folder ("notepad") i put one more time "New Folder" and name it "command" (must be same name) Inside of "command" at string ("Default") put the location through notepad ("C:\Windows\system32\notepad.exe") - and now when you click right mouse button on desktop will see new context text with name "notepad" what will of course open notepad if you use them Well what i'm searching for is to find solution of how to make context name which will offer as to use more that one programs, do you have any solution? O.S. win 7

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• Adding more RAM at different speeds? Will it impact performance as much as to make it worse than without adding it?

  - by user1676874

  I got a new laptop with 4GBs of ram, expandable to 8GBs. It has 1 4GB stick DDR3 PC3-12800 at 1600Mhz. I can't seem to find another one exactly the same locally, the closest I've found is 1 4GB stick DDR3 PC3-10600 at 1333Mhz. So my question is, I know they will both run at the slowest speed, so even if I have more available RAM it will become slower. Is the performance loss big enough to make the upgrade not worth the hassle?

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• Monitor doesn't turn on the first try, is power supply failure imminent?

  - by xiao

  I been noticing for the last couple days that when I turn on my computer and then my monitor(22inch lcd) that my monitor does not turn on. I push the "on" button and the blue light comes on but the screen is blank. I usually have to then restart my computer and then my monitor will show in the upper left hand corner a dialog bog that says "analog" and it is flickering. Then everything goes to normal. Thinking it is the power supply but at the same time the tower is a year old(it came with a power supply). So when I take that into consideration I am not sure.

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• Stretch VMWare Player guest OS to fullscreen

  - by Synetech

  I’m using VMWare Player to play an old 16-bit Windows game. Unfortunately the game uses only 640x480 and I cannot figure out how to stretch the VM window to full-screen on the host. I set the guest OS to 640x480, but the screen is still small, in the middle of the screen as seen in figure 1. I even tried setting the compatibility mode to Windows 95 and 640x480, but it has no effect (figure 2) and looks exactly the same as when I set the VM to full-screen (1366x768 on the laptop) and start the game normally. There are few references to stretching a VM. One page mentions setting a Stretch Guest option, but there is no such option, at least not in VMWare Player 4.0.3. I know that VirtualBox has a stretching option, but I’m trying to find a solution for VMWare (Player, not Workstation). Figure 1: Guest OS is pillar-boxed Figure 2: Using compatibility mode

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• Why are all google website suddenly giving untrusted certificate warnings in my Firefox v10?

  - by WilliamKF

  Today, I am suddenly getting the untrusted website error for all Google websites, but not for any other. Internet Explorer gives no such error. Reboot of this Windows 7 computer does not help. Is this some kind of virus infection that is hijacking DNS resolution away from Google to some spoofer? How can I resolve this issue and get Google websites working again normally? If I manually enter a Google IP Address, the page loads correctly.

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• How to download Vim script on the command-line?

  - by HaiYuan Zhang

  Whenever I want to install a new Vim script on the Linux server I'm working on, my typical workflow is as the following: surf the plugin's homepage in Vim online using FireXXXX download a right version of the plugin to my laptop by click some highlighted link upload the downloaded plugin from my laptop to Linux server using WinSCP which is really inconvenient. I don't know what is the magic behind this: I mean for the same hyperlink I click it in web browser. I can let you download it but use Wget plus the hyperlink in Linux command-line will end up with nothing but an error indication. Hyperlink in the web browser. Otherwise I can get the link in web browser and then use Wget or some similar tool to actually do the downloding. I try new cool Vim scripts quite ofte , so you can imagine my dismay when I have to repeat the tedious action all the time. What are some tips which can let me download the Vim scripts in a more "professional" way? Post edit: My problem is not find a tool like Wget or cURL. The problem I met is quite specific; to use these tools to download a Vim script. Let's take http://www.vim.org/scripts/script.php?script_id=30 as an example. It's the normal place where one can get the script, at least for me. But I can't find an working URL from this page that can feed to Wget.

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• problems with my touchpad on my netbook

  - by user23421

  ive been having trouble with my touchpad its a synaptic pad. my problem is whenever i drag my finger across i a lot of times get this grey circle and i cant move anymore i have to take my finger off and start again its very annoying and the icon for the touchpad thats by the clock gets like a curved arrow in it and if i move my finger a little bit while this grey circle appears the arrow rotates in a circle its very weird! i have a Asus 1101HAB netbook and ive tried to update the driver when the asus updates appear and when i do it and restart the computer, then a couple days later maybe it pops up again saying i have an update and its for the touchpad and its the same version... not sure if its a bigger problem its only a week old that ive had this computer. If someone could help it would be much appreciated.

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• A good MP3/media player for Mac OS X?

  - by Rich

  I've been trying to use iTunes now for about a year, and we just don't get on. So I tried instaling Windows Media Player for the Mac ... and there's no support for MP3s .. useless. I looked at Winamp, but this has to be run through wine or some other cocktail of programs. So this leads me to ask, are there a good (native) mp3 player for the Mac? I want something like Media Player on Windows or Winamp. I don't want something to re-organize my music directories, I have put the music in the directories they're in for a very good reason. Any suggestions?

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• SQL SERVER – Weekly Series – Memory Lane – #004

  - by pinaldave

  Here is the list of curetted articles of SQLAuthority.com across all these years. Instead of just listing all the articles I have selected a few of my most favorite articles and have listed them here with additional notes below it. Let me know which one of the following is your favorite article from memory lane. 2006 Auto Generate Script to Delete Deprecated Fields in Current Database In early career everytime I have to drop a column, I had hard time doing it because I was scared what if that column was needed somewhere in the code. Due to this fear I never dropped any column. I just renamed the column. If the column which I renamed was needed afterwards it was very easy to rename it back again. However, it is not recommended to keep the deleted column renamed in the database. At every interval I used to drop the columns which was prefixed with specific word. This script is 6 years old but still works. Give it a look, I am open for improvements. 2007 Shrinking Truncate Log File – Log Full – Part 2 Shrinking database or mdf file is indeed bad thing and it creates lots of problems. However, once in a while there is legit requirement to shrink the log file – a very rare one. In the rare occasion shrinking or truncating the log file may be the only solution. However, one should make sure to take backup before and after the truncate or shrink as in case of a disaster they can be very useful. Remember that truncating log file will break the log chain and while restore it can create major issue. Anyway, use this feature with caution. 2008 Simple Use of Cursor to Print All Stored Procedures of Database Including Schema This is a very interesting requirement I used to face in my early career days, I needed to print all the Stored procedures of my database. Interesting enough I had written a cursor to do so. Today when I look back at this stored procedure, I believe there will be a much cleaner way to do the same task, however, I still use this SP quite often when I have to document all the stored procedures of my database. Interesting Observation about Order of Resultset without ORDER BY In industry many developers avoid using ORDER BY clause to display the result in particular order thinking that Index is enforcing the order. In this interesting example, I demonstrate that without using ORDER BY, same table and similar query can return different results. Query optimizer always returns results using any method which is optimized for performance. The learning is There is no order unless ORDER BY is used. 2009 Size of Index Table – A Puzzle to Find Index Size for Each Index on Table I asked this puzzle earlier where I asked how to find the Index size for each of the tables. The puzzle was very well received and lots of interesting answers were received. To answer this question I have written following blog posts. I suggest this weekend you try to solve this problem and see if you can come up with a better solution. If not, well here are the solutions. Solution 1 | Solution 2 | Solution 3 Understanding Table Hints with Examples Hints are options and strong suggestions specified for enforcement by the SQL Server query processor on DML statements. The hints override any execution plan the query optimizer might select for a query. The SQL Server Query optimizer is a very smart tool and it makes a better selection of execution plan. Suggesting hints to the Query Optimizer should be attempted when absolutely necessary and by experienced developers who know exactly what they are doing (or in development as a way to experiment and learn). Interesting Observation – TOP 100 PERCENT and ORDER BY I have seen developers and DBAs using TOP very causally when they have to use the ORDER BY clause. Theoretically, there is no need of ORDER BY in the view at all. All the ordering should be done outside the view and view should just have the SELECT statement in it. It was quite common that to save this extra typing by including ordering inside of the view. At several instances developers want a complete resultset and for the same they include TOP 100 PERCENT along with ORDER BY, assuming that this will simulate the SELECT statement with ORDER BY. 2010 SQLPASS Nov 8-11, 2010-Seattle – An Alternative Look at Experience In year 2010 I attended most prestigious SQL Server event SQLPASS between Nov 8-11, 2010 at Seattle. I have only one expression for the event - Best Summit Ever. Instead of writing about my usual routine or the event, I wrote about the interesting things I did and how I felt about it! When I go back and read it, I feel that this is the best event I attended in year 2010. Change Database Access to Single User Mode Using SSMS Image says all. 2011 SQL Server 2012 has introduced new analytic functions. These functions were long awaited and I am glad that they are now here. Before when any of this function was needed, people used to write long T-SQL code to simulate these functions. But now there’s no need of doing so. Having available native function also helps performance as well readability. Function SQLAuthority MSDN CUME_DIST CUME_DIST CUME_DIST FIRST_VALUE FIRST_VALUE FIRST_VALUE LAST_VALUE LAST_VALUE LAST_VALUE LEAD LEAD LEAD LAG LAG LAG PERCENTILE_CONT PERCENTILE_CONT PERCENTILE_CONT PERCENTILE_DISC PERCENTILE_DISC PERCENTILE_DISC PERCENT_RANK PERCENT_RANK PERCENT_RANK Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Memory Lane, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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• Which devices is my app working on

  - by Woojah

  My team is developing an app that will work on about 100 (or more) different android devices. We are having trouble testing it since we are not sure how to verify if it works on all the different devices. Can anybody suggest some best practices, a testing framework, or some sort of way to give us feedback on how to test our app and/or get feedback from our users so they can tell us the problems they are having?

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• Can i use aac in an commercial app for free?

  - by Jason123

  I was wondering if i can use the aac codec in my commercial app for free (through lgpl ffmpeg). It says on the wiki: No licenses or payments are required to be able to stream or distribute content in AAC format.[36] This reason alone makes AAC a much more attractive format to distribute content than MP3, particularly for streaming content (such as Internet radio). However, a patent license is required for all manufacturers or developers of AAC codecs. For this reason free and open source software implementations such as FFmpeg and FAAC may be distributed in source form only, in order to avoid patent infringement. (See below under Products that support AAC, Software.) But the xSplit program had to cancel the AAC for free members because they have to pay royalties per person. Is this true (that you have to pay per each person that uses aac)? If you do have to pay, which company do you pay to and how does one apply?

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• More productive alone than in a team?

  - by Furry

  If I work alone, I used to be superproductive, if I want to be. Running prototypes within a day, something that you can deploy and use within a few days. Not perfect, but good enough. I also had this experience a few times when working directly with someone else. Everybody could do the whole thing, but it was more fun not to do it alone and also quicker. The right two people can take an admittedly not too large project onto new levels. Now at work we have a seven person team and I do not feel nearly as productive. Not even nearly. Certain stuff needs to be checked against something else, which then needs to also take care of some new requirement, which just came in three days ago. All sorts of stuff, mostly important, but often just a technical debt from long ago or misconception or different vocabulary for the same thing or sometimes just a not too technically thought out great idea from someone who wants to have their say, and so on. Digging down the rabbit hole, I think to myself, I could do larger portions of this work faster alone (and somewhat better, too), but it's not my responsibility (someone else gets paid for that), so by design I should not care. But I do, because certain things go hand in hand (as you may experience it, when you done sideprojects on your own). I know this is something Fred Brooks has written about, but still, what's your strategy for staying as productive as you know you could be in the cubicle? Or did you quit for some related reason; and if so where did you go?

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