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• What could be the Consequence of inserting "id" in any autoincrementing 'id' containing table?

  - by Parth

  What could be the Consequence of inserting "id" in any autoincrementing 'id' containing table? If I have a Tabe in which I have configured the column "id" as the auto incrmented, But still I am using an INSERT query in which id is defined, like wise INSERT INTO XYZ (id) values ('26'); How does it going to effect the table and the process related to it.. Is it "no issues" to do this? or it should be avoided?

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• Generating Color Gradient

  - by Malfist

  I want to display to my user how many (percent wise) of their forms are compliant with the new standard. The way I want to let them know visually is the percent amount will be colored. It will be 0xFF0000 (pure red) for 0% and 0x00FF00 (pure green) at 100%. What is the best way to calculate the color for each step along the way?

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• Can I use php's fwrite with 644 file permissions?

  - by filip

  I am trying to set up automated .htaccess updating. This clearly needs to be as secure as possible, however right now the best I can do file permission-wise is 666. What can I do to setup either my server or php code so that my script's fwrite() command will work with 644 or better? For instance is there a way to set my script(s) to run as owner?

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• Oracle - truncating a global temporary table

  - by superdario

  I am processing large amounts of data in iterations, each and iteration processes around 10-50 000 records. Because of such large number of records, I am inserting them into a global temporary table first, and then process it. Usually, each iteration takes 5-10 seconds. Would it be wise to truncate the global temporary table after each iteration so that each iteration can start off with an empty table? There are around 5000 iterations.

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• Is c++ MFC outmoded?

  - by Ala ABUDEEB

  is it wise to learn programming vc++ with MFC library, or it is outmoded? if so what should one use instread? thank you

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• How much information do pdb files contain? (C# / .NET)

  - by Silver Dragon

  Is is wise to redistribute the pdb files along with a commercial application? Occasionally, I'm using the stack trace to get a more detailed error reporting logs from the deployed applications; can this functionality be achieved without relying to those files? Also, how much hints of the original source code does these files contain? Would it be easier to reverse-engineer my application using it?

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• x86 Instruction Format: "ba 0e 00 00 00" ... "mov $0xe,%edx"

  - by Andrew Tomazos - Fathomling

  I'm getting the following line in the disassembly from objdump -d of an x86 linux program... 4000b0: ba 0e 00 00 00 mov $0xe,%edx I'm trying to understand how the machine code "ba 0e 00 00 00" maps to "mov $0xe,%edx" In the manual move immediate 32-bit is: B8 + rd ... MOV r32, imm32 ie "B8" not "BA" In fact none of the MOV opcodes are "BA". If someone could break down "ba 0e 00 00 00" and explain bit-wise how to get to "mov $0xe,%edx" it would be most helpful.

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• Is there a difference between placing JavaScript calls in $(document).ready(function(){ and placing

  - by Walker

  Is there a difference, performance or efficiency wise, between placing javascript calls such as blur, onclick etc. in $(document).ready(function(){ as opposed to placing them in DOM? Thanks!

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• Is it possible to execute the two update queries in phpmyadmin together?

  - by Parth

  Is it possible to execute the two update queries in phpmyadmin together? Like wise UPDATE jos_menu SET home = 0 WHERE 1; UPDATE jos_menu SET home = 1 WHERE id = 9; Now can we copy both these queries together and Run it on phpmyadmin sql query panel? will it be executed?

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• Query in data population using select in jsp

  - by sarah

  I am populating data using <select name="test"> <option value='<%=session.getAttribute("tList")%>'><%=session.getAttribute("tList") %></option> </select> but the values are getting display in a single row in the combo box not row wise,where i am going wrong ?

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• Can "Distinct" key Word be used twice in a single Select Query?

  - by OM The Eternity

  Can "Distinct" key Word be used twice in a single Select Query? like wise: select DISTINCT(trackid), DISTINCT(table_name) from jos_audittrail where live = 0 AND operation = UPDATE Thanks

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• Supressing inlining warning

  - by thetna

  I am getting inling warning such as : warning: inlining failed in call to ‘symbol_Arity’: call is unlikely and code size would grow To get rid of this i changed the makefile adding the -Winline to get rid of this. I don't get any inlining warning. But , i don't know how wise is it to do in respect of performance. Can anybody please suggest me about it?

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• Generate 3 random number that sum to 1 in R

  - by user1034797

  I am hoping to create 3 (non-negative) quasi-random numbers that sum to one, and repeat over and over. Basically I am trying to partition something into three random parts over many trials. While I am aware of a= runif(3,0,1) I was thinking that I could use 1-a as the max in the next run if, but it seems messy. But these of course don't sum to one. Any thoughts, oh wise stackoverflow-ers?

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• programming/selling mobile apps internationally

  - by dootcher

  If I'm looking to sell my app in other markets other than the U.S. on both Android and iOS, do I need to do anything inside the app coding-wise? I don't imagine that I need to but I just want to make sure. Also, while I'm at it, how do I collect on international app purchases considering they are in another currency? Will the currency be automatically converted to U.S. dollars or is that my job? Any insight on either of these questions would be greatly appreciated.

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• How to Count tickets as DateWise

  - by user560716

  I have a query regarding my report, the report format is as under **Date** **Received** **Closed** **Pending** 12/01/10 1000 900 100 12/02/10 2000 1000 1000 12/03/10 1500 1300 200 The above report shows the Help Desk tickets Received, Closed, Pending Count as date wise. How can I create a dynamic SQL query to show above result? Received Tickets is calculated on SubmitedDate Closed Tickets is calculated on ClosedDate with status "Closed" same for Pending Tickets whose status is "Pending". Please provide me the idea or some sample SQL queries.

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• how to group MySql rows based on month?

  - by understack

  I've a table with a datetime (format: 'Y-m-d H:i:s') 'created' field and 'amount' (integer) field in each row. Now I want to find out total 'amount' in last year month wise. How can I do this? EDIT I made an edit to clarify the actual problem.

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• should autocomplete="off" be used for all sensitive fields?

  - by new_guy

  What are your thoughts about this issue in regards to an e-commerce environment? Do you think it is wise to turn autocomplete off on all sensitive input fields such as passwords (for log in areas), or, will this just inconvenience the client? thank you

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• mysqli - Do I really need to do $result->close(); & $mysqli->close(); ?

  - by James

  Just started using mysqli. If I'm working with small data sets on small websites (traffic-wise), do I really need to use these all the time? $result-close(); $mysqli-close(); also, for someone doing custom php & mysql work, without a framework, is mysqli the general preferred way of interacting with mysql?

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• requestFocus() in java?

  - by Venkats

  In JTable, if you are inserting values to that row of 4 in first column, Then the focus goes to first row and second column by default. I want to focus the next column of the same row( ie., row 4). How to set requestFocus() in JTable by row wise.?

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• 5 Ways Android Still Disappoints (Me)

  - by TStewartDev

  Let me make this clear: I'm annoyed with Apple. I don't like their current policies and I don't like where Steve Jobs is taking the company. In general, I don't like it when any one company gets too much control in a market. When that happens, the leading company dictates the game and as consumers, our options all but disappear. That said, I'm still going to buy a new iPhone next week. My Apple-hating friends seem to desperately want me to go Android instead, but frankly, it's not good enough for me, and here are the reasons why. The Modern WinMo One of the reasons that Microsoft has identified for Windows Mobile's rapid decline is the breadth of hardware. They exercised little control over manufacturer's implementations. In theory, that sounds great. We as consumers have lots of choice. In practice, though, it meant among other things that updates to the devices were left up to the manufacturers. As a result, that rarely happened. (I'm still bitter at Toshiba for leaving me hanging back in 2002.) And now, Google is doing the same thing with Android. Case in point: my wife has a Motorola Backflip that we bought in April. It was released in March. Motorola says it will get Android 2.1 "sometime in Q3". Great. Meanwhile, I pull down the latest version of iPhone OS (now iOS) and install it the same day it's released. You may say that I can't judge Android by one lazy manufacturer. Yup, I sure can. With Apple, my original iPhone has been supported perfectly for 3 years. With Android, I will have to wait for upgrades after Google releases them, possibly indefinitely. Not cool. AT&T We signed a new contract with AT&T in April to get my wife's phone. I've had a reasonable experience with them. I don't imagine my experience with Verizon would be any better, and I'm relatively confident that Sprint doesn't have the coverage it takes to work well for us. The fact is, AT&T, for whatever reason, doesn't have jack for Android phones. May not be Android's fault, but it's still a shortcoming that prevents me from having it just like the iPhone's exclusivity keeps some folks on other networks from having it. Innovation? What Innovation? Android has a nice dashboard and a great notification system and… nothing else original. I keep reading about how disappointing the iPhone is nowadays. "It has no innovation," people say. Who does? Android has modeled its behavior after the iPhone. That's fine, but if all you've got is a similar product and I'm invested both skill-wise and app-wise in my current platform, why should I change? Microsoft's new Windows Phone 7 looks somewhat innovative, and I'm pretty excited to see what they'll bring to the table, but that's another six months away, at least. I've got a 3 year old phone that has some annoying issues now (thanks to recent encounters with water). I need a new phone now. Is This Going to Work? There's no shortage of criticism of Apple over its App Store policies, and I've vented my own anger about it. However, I will give them credit: their screening of apps has done a great job of weeding out the crap and gives an excellent indication that the app will work on my device. How about Android? Nope. It might work on your phone. Maybe. You'll have to try it to see. Get burned by it? Well, write a nasty review to try to keep others from making the mistake you did. If you don't mind doing that stuff, then Android is the platform for you. Personally, I'd rather have a receptionist screening out the telemarketing and survey calls than hang up on them myself, but that's your call. Slow, Slowing, Slower All this yapping about multitasking. This is an area I've been on Apple's side from the beginning. Sorry folks, but this is the number one reason I hated Windows Mobile: the longer you use it, the slower it gets because it doesn't kill apps. I'm with Steve Jobs on this one: if you see a task manager, we're doing it wrong. I don't want to have to manually kill apps. I hate doing that on Windows let alone on a mobile device. To me, priority one should be keeping the device speedy. Waiting for your device to respond is unacceptable. Bonus! Taken from iPhone Letdown? 8 Things Apple Didn't Announce, here are my responses: 4G Yeah, let me know if your area actually has it. I live in Lincoln, Nebraska. No carrier is going to have 4G here for at least 3 years. Meanwhile, you still get to pay for it. Yay! Cloud iTunes/OTA Sync You got me here. Of course, whether or not your Android device will be able to do it is always a good question. 3G Video Chat You got me here, too. I'm sure you spent countless hours in front of your phone with video chat. Also, I can't wait for the "No Video Chat While Driving" laws. Mobile Hotspot This is a neat feature, but as the author points out, it's left up to the carrier whether to implement it or not. Pretty sure any Android phones that come to AT&T won't have this enabled in the foreseeable future. Is Verizon even allowing this? I just figured Sprint was because they're failing so hard at keeping customers. Free MobileMe I use Google's services with my iPhone. The only people I know who use MobileMe are Apple fanboys and fangirls. If you choose to pay for a service that you can get for free, that's your decision, not Apple's. Voice Input Voice input has been available on phones (even "dumb" phones) for years now. iPhone does have the ability, though limited. Why don't I hear people telling their phones what to do? Maybe because it's still easier to use your fingers than talk to it. Get back to me when this becomes an important feature. Free Navigation Maybe this will be a bigger deal to me now that I'm getting a phone with GPS, but when using my buddy's 3gs, Google maps has worked just fine. Maybe I just don't trust turn-by-turn navigation enough to want it. Dashboard The only legitimate complaint on this list, to me. iPhone's home screen is pathetic, doubly so for the iPad. What a waste of perfectly usable space. I also want to add notifications to this list. Android's notification panel is far superior to the iPhone's. I don't want to hunt all over my screen to find little red dots. Put 'em in one place, Apple.

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• Generating a drop down list of timezones with PHP

  - by Xeoncross

  Most sites need some way to show the dates on the site in the users preferred timezone. Below are two lists that I found and then one method using the built in PHP DateTime class in PHP 5. I need help knowing which of these would be the best to attempt to use when trying to get the UTC offset from the user on register. One: <option value="-12">[UTC - 12] Baker Island Time</option> <option value="-11">[UTC - 11] Niue Time, Samoa Standard Time</option> <option value="-10">[UTC - 10] Hawaii-Aleutian Standard Time, Cook Island Time</option> <option value="-9.5">[UTC - 9:30] Marquesas Islands Time</option> <option value="-9">[UTC - 9] Alaska Standard Time, Gambier Island Time</option> <option value="-8">[UTC - 8] Pacific Standard Time</option> <option value="-7">[UTC - 7] Mountain Standard Time</option> <option value="-6">[UTC - 6] Central Standard Time</option> <option value="-5">[UTC - 5] Eastern Standard Time</option> <option value="-4.5">[UTC - 4:30] Venezuelan Standard Time</option> <option value="-4">[UTC - 4] Atlantic Standard Time</option> <option value="-3.5">[UTC - 3:30] Newfoundland Standard Time</option> <option value="-3">[UTC - 3] Amazon Standard Time, Central Greenland Time</option> <option value="-2">[UTC - 2] Fernando de Noronha Time, South Georgia &amp; the South Sandwich Islands Time</option> <option value="-1">[UTC - 1] Azores Standard Time, Cape Verde Time, Eastern Greenland Time</option> <option value="0" selected="selected">[UTC] Western European Time, Greenwich Mean Time</option> <option value="1">[UTC + 1] Central European Time, West African Time</option> <option value="2">[UTC + 2] Eastern European Time, Central African Time</option> <option value="3">[UTC + 3] Moscow Standard Time, Eastern African Time</option> <option value="3.5">[UTC + 3:30] Iran Standard Time</option> <option value="4">[UTC + 4] Gulf Standard Time, Samara Standard Time</option> <option value="4.5">[UTC + 4:30] Afghanistan Time</option> <option value="5">[UTC + 5] Pakistan Standard Time, Yekaterinburg Standard Time</option> <option value="5.5">[UTC + 5:30] Indian Standard Time, Sri Lanka Time</option> <option value="5.75">[UTC + 5:45] Nepal Time</option> <option value="6">[UTC + 6] Bangladesh Time, Bhutan Time, Novosibirsk Standard Time</option> <option value="6.5">[UTC + 6:30] Cocos Islands Time, Myanmar Time</option> <option value="7">[UTC + 7] Indochina Time, Krasnoyarsk Standard Time</option> <option value="8">[UTC + 8] Chinese Standard Time, Australian Western Standard Time, Irkutsk Standard Time</option> <option value="8.75">[UTC + 8:45] Southeastern Western Australia Standard Time</option> <option value="9">[UTC + 9] Japan Standard Time, Korea Standard Time, Chita Standard Time</option> <option value="9.5">[UTC + 9:30] Australian Central Standard Time</option> <option value="10">[UTC + 10] Australian Eastern Standard Time, Vladivostok Standard Time</option> <option value="10.5">[UTC + 10:30] Lord Howe Standard Time</option> <option value="11">[UTC + 11] Solomon Island Time, Magadan Standard Time</option> <option value="11.5">[UTC + 11:30] Norfolk Island Time</option> <option value="12">[UTC + 12] New Zealand Time, Fiji Time, Kamchatka Standard Time</option> <option value="12.75">[UTC + 12:45] Chatham Islands Time</option> <option value="13">[UTC + 13] Tonga Time, Phoenix Islands Time</option> <option value="14">[UTC + 14] Line Island Time</option> Or using PHP friendly values: <option value="Pacific/Midway">(GMT-11:00) Midway Island, Samoa</option> <option value="America/Adak">(GMT-10:00) Hawaii-Aleutian</option> <option value="Etc/GMT+10">(GMT-10:00) Hawaii</option> <option value="Pacific/Marquesas">(GMT-09:30) Marquesas Islands</option> <option value="Pacific/Gambier">(GMT-09:00) Gambier Islands</option> <option value="America/Anchorage">(GMT-09:00) Alaska</option> <option value="America/Ensenada">(GMT-08:00) Tijuana, Baja California</option> <option value="Etc/GMT+8">(GMT-08:00) Pitcairn Islands</option> <option value="America/Los_Angeles">(GMT-08:00) Pacific Time (US & Canada)</option> <option value="America/Denver">(GMT-07:00) Mountain Time (US & Canada)</option> <option value="America/Chihuahua">(GMT-07:00) Chihuahua, La Paz, Mazatlan</option> <option value="America/Dawson_Creek">(GMT-07:00) Arizona</option> <option value="America/Belize">(GMT-06:00) Saskatchewan, Central America</option> <option value="America/Cancun">(GMT-06:00) Guadalajara, Mexico City, Monterrey</option> <option value="Chile/EasterIsland">(GMT-06:00) Easter Island</option> <option value="America/Chicago">(GMT-06:00) Central Time (US & Canada)</option> <option value="America/New_York">(GMT-05:00) Eastern Time (US & Canada)</option> <option value="America/Havana">(GMT-05:00) Cuba</option> <option value="America/Bogota">(GMT-05:00) Bogota, Lima, Quito, Rio Branco</option> <option value="America/Caracas">(GMT-04:30) Caracas</option> <option value="America/Santiago">(GMT-04:00) Santiago</option> <option value="America/La_Paz">(GMT-04:00) La Paz</option> <option value="Atlantic/Stanley">(GMT-04:00) Faukland Islands</option> <option value="America/Campo_Grande">(GMT-04:00) Brazil</option> <option value="America/Goose_Bay">(GMT-04:00) Atlantic Time (Goose Bay)</option> <option value="America/Glace_Bay">(GMT-04:00) Atlantic Time (Canada)</option> <option value="America/St_Johns">(GMT-03:30) Newfoundland</option> <option value="America/Araguaina">(GMT-03:00) UTC-3</option> <option value="America/Montevideo">(GMT-03:00) Montevideo</option> <option value="America/Miquelon">(GMT-03:00) Miquelon, St. Pierre</option> <option value="America/Godthab">(GMT-03:00) Greenland</option> <option value="America/Argentina/Buenos_Aires">(GMT-03:00) Buenos Aires</option> <option value="America/Sao_Paulo">(GMT-03:00) Brasilia</option> <option value="America/Noronha">(GMT-02:00) Mid-Atlantic</option> <option value="Atlantic/Cape_Verde">(GMT-01:00) Cape Verde Is.</option> <option value="Atlantic/Azores">(GMT-01:00) Azores</option> <option value="Europe/Belfast">(GMT) Greenwich Mean Time : Belfast</option> <option value="Europe/Dublin">(GMT) Greenwich Mean Time : Dublin</option> <option value="Europe/Lisbon">(GMT) Greenwich Mean Time : Lisbon</option> <option value="Europe/London">(GMT) Greenwich Mean Time : London</option> <option value="Africa/Abidjan">(GMT) Monrovia, Reykjavik</option> <option value="Europe/Amsterdam">(GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna</option> <option value="Europe/Belgrade">(GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague</option> <option value="Europe/Brussels">(GMT+01:00) Brussels, Copenhagen, Madrid, Paris</option> <option value="Africa/Algiers">(GMT+01:00) West Central Africa</option> <option value="Africa/Windhoek">(GMT+01:00) Windhoek</option> <option value="Asia/Beirut">(GMT+02:00) Beirut</option> <option value="Africa/Cairo">(GMT+02:00) Cairo</option> <option value="Asia/Gaza">(GMT+02:00) Gaza</option> <option value="Africa/Blantyre">(GMT+02:00) Harare, Pretoria</option> <option value="Asia/Jerusalem">(GMT+02:00) Jerusalem</option> <option value="Europe/Minsk">(GMT+02:00) Minsk</option> <option value="Asia/Damascus">(GMT+02:00) Syria</option> <option value="Europe/Moscow">(GMT+03:00) Moscow, St. Petersburg, Volgograd</option> <option value="Africa/Addis_Ababa">(GMT+03:00) Nairobi</option> <option value="Asia/Tehran">(GMT+03:30) Tehran</option> <option value="Asia/Dubai">(GMT+04:00) Abu Dhabi, Muscat</option> <option value="Asia/Yerevan">(GMT+04:00) Yerevan</option> <option value="Asia/Kabul">(GMT+04:30) Kabul</option> <option value="Asia/Yekaterinburg">(GMT+05:00) Ekaterinburg</option> <option value="Asia/Tashkent">(GMT+05:00) Tashkent</option> <option value="Asia/Kolkata">(GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi</option> <option value="Asia/Katmandu">(GMT+05:45) Kathmandu</option> <option value="Asia/Dhaka">(GMT+06:00) Astana, Dhaka</option> <option value="Asia/Novosibirsk">(GMT+06:00) Novosibirsk</option> <option value="Asia/Rangoon">(GMT+06:30) Yangon (Rangoon)</option> <option value="Asia/Bangkok">(GMT+07:00) Bangkok, Hanoi, Jakarta</option> <option value="Asia/Krasnoyarsk">(GMT+07:00) Krasnoyarsk</option> <option value="Asia/Hong_Kong">(GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi</option> <option value="Asia/Irkutsk">(GMT+08:00) Irkutsk, Ulaan Bataar</option> <option value="Australia/Perth">(GMT+08:00) Perth</option> <option value="Australia/Eucla">(GMT+08:45) Eucla</option> <option value="Asia/Tokyo">(GMT+09:00) Osaka, Sapporo, Tokyo</option> <option value="Asia/Seoul">(GMT+09:00) Seoul</option> <option value="Asia/Yakutsk">(GMT+09:00) Yakutsk</option> <option value="Australia/Adelaide">(GMT+09:30) Adelaide</option> <option value="Australia/Darwin">(GMT+09:30) Darwin</option> <option value="Australia/Brisbane">(GMT+10:00) Brisbane</option> <option value="Australia/Hobart">(GMT+10:00) Hobart</option> <option value="Asia/Vladivostok">(GMT+10:00) Vladivostok</option> <option value="Australia/Lord_Howe">(GMT+10:30) Lord Howe Island</option> <option value="Etc/GMT-11">(GMT+11:00) Solomon Is., New Caledonia</option> <option value="Asia/Magadan">(GMT+11:00) Magadan</option> <option value="Pacific/Norfolk">(GMT+11:30) Norfolk Island</option> <option value="Asia/Anadyr">(GMT+12:00) Anadyr, Kamchatka</option> <option value="Pacific/Auckland">(GMT+12:00) Auckland, Wellington</option> <option value="Etc/GMT-12">(GMT+12:00) Fiji, Kamchatka, Marshall Is.</option> <option value="Pacific/Chatham">(GMT+12:45) Chatham Islands</option> <option value="Pacific/Tongatapu">(GMT+13:00) Nuku'alofa</option> <option value="Pacific/Kiritimati">(GMT+14:00) Kiritimati</option> Or just using PHP it's self $timezones = DateTimeZone::listAbbreviations(); $cities = array(); foreach( $timezones as $key => $zones ) { foreach( $zones as $id => $zone ) { /** * Only get timezones explicitely not part of "Others". * @see http://www.php.net/manual/en/timezones.others.php */ if ( preg_match( '/^(America|Antartica|Arctic|Asia|Atlantic|Europe|Indian|Pacific)\//', $zone['timezone_id'] ) && $zone['timezone_id']) { $cities[$zone['timezone_id']][] = $key; } } } // For each city, have a comma separated list of all possible timezones for that city. foreach( $cities as $key => $value ) $cities[$key] = join( ', ', $value); // Only keep one city (the first and also most important) for each set of possibilities. $cities = array_unique( $cities ); // Sort by area/city name. ksort( $cities ); It seems like the last one would be the safest as it would grow with the PHP release being used. You could also flip that array around when needed to tie timezones to city names.

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• YouTube Scalability Lessons

  - by Bertrand Matthelié

  @font-face { font-family: "Arial"; }@font-face { font-family: "Courier New"; }@font-face { font-family: "Wingdings"; }@font-face { font-family: "Calibri"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }h2 { margin: 12pt 0cm 3pt; page-break-after: avoid; font-size: 14pt; font-family: "Times New Roman"; font-style: italic; }a:link, span.MsoHyperlink { color: blue; text-decoration: underline; }a:visited, span.MsoHyperlinkFollowed { color: purple; text-decoration: underline; }span.Heading2Char { font-family: Calibri; font-weight: bold; font-style: italic; }div.Section1 { page: Section1; }ol { margin-bottom: 0cm; }ul { margin-bottom: 0cm; } Very interesting blog post by Todd Hoff at highscalability.com presenting “7 Years of YouTube Scalability Lessons in 30 min” based on a presentation from Mike Solomon, one of the original engineers at YouTube: …. The key takeaway away of the talk for me was doing a lot with really simple tools. While many teams are moving on to more complex ecosystems, YouTube really does keep it simple. They program primarily in Python, use MySQL as their database, they’ve stuck with Apache, and even new features for such a massive site start as a very simple Python program. That doesn’t mean YouTube doesn’t do cool stuff, they do, but what makes everything work together is more a philosophy or a way of doing things than technological hocus pocus. What made YouTube into one of the world’s largest websites? Read on and see... Stats @font-face { font-family: "Arial"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } 4 billion Views a day 60 hours of video is uploaded every minute 350+ million devices are YouTube enabled Revenue double in 2010 The number of videos has gone up 9 orders of magnitude and the number of developers has only gone up two orders of magnitude. 1 million lines of Python code Stack @font-face { font-family: "Arial"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } Python - most of the lines of code for YouTube are still in Python. Everytime you watch a YouTube video you are executing a bunch of Python code. Apache - when you think you need to get rid of it, you don’t. Apache is a real rockstar technology at YouTube because they keep it simple. Every request goes through Apache. Linux - the benefit of Linux is there’s always a way to get in and see how your system is behaving. No matter how bad your app is behaving, you can take a look at it with Linux tools like strace and tcpdump. MySQL - is used a lot. When you watch a video you are getting data from MySQL. Sometime it’s used a relational database or a blob store. It’s about tuning and making choices about how you organize your data. Vitess- a  new project released by YouTube, written in Go, it’s a frontend to MySQL. It does a lot of optimization on the fly, it rewrites queries and acts as a proxy. Currently it serves every YouTube database request. It’s RPC based. Zookeeper - a distributed lock server. It’s used for configuration. Really interesting piece of technology. Hard to use correctly so read the manual Wiseguy - a CGI servlet container. Spitfire - a templating system. It has an abstract syntax tree that let’s them do transformations to make things go faster. Serialization formats - no matter which one you use, they are all expensive. Measure. Don’t use pickle. Not a good choice. Found protocol buffers slow. They wrote their own BSON implementation, which is 10-15 time faster than the one you can download. ...Contiues. Read the blog Watch the video

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• Dual monitors through 1 HDMI port

  - by Carlos

  I currently have a Dell Studio XPS 13 laptop connected to a 24" HP monitor (w2448hc). Im thinking on getting a second one, however am wondering what i need for the setup (hardware wise). Also I was wondering it there is any down side to it, or something i should be aware of. For example, image quality loss, GPU overloading, or anything important I should know. More than anything Im interested in your advice. Also the monitors do have built in speakers (HDMI sound output), is the sound going to be reproduced by only one monitor or both? Specs Model: Dell Studio XPS 13 OS: Genuine Windows® 7 Home Premium 64-Bit CPU: Intel® CoreTM 2 Duo P8600 (2.4GHz, 3MB L2 Cache, 1067MHz FSB) Chipset: NVIDIA® GeForce® MCP79MX RAM: 4GB 1067MHz DDR3 SDRAM Graphics: SLi NVIDIA® GeForce® 9500M - 256MB Thanks for your advice, if there is anything additional i need to buy an you have a personal preference pass the brand name so i can check it out. Thanks!

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• Dual monitors though 1 HDMI port

  - by Carlos

  I currently have a Dell Studio XPS 13 laptop connected to a 24" HP monitor (w2448hc). Im thinking on getting a second one, however am wondering what i need for the setup (hardware wise). Also I was wondering it there is any down side to it, or something i should be aware of. For example, image quality loss, GPU overloading, or anything important I should know. More than anything Im interested in your advice. Also the monitors do have built in speakers (HDMI sound output), is the sound going to be reproduced by only one monitor or both? Specs Model: Dell Studio XPS 13 OS: Genuine Windows® 7 Home Premium 64-Bit CPU: Intel® CoreTM 2 Duo P8600 (2.4GHz, 3MB L2 Cache, 1067MHz FSB) Chipset: NVIDIA® GeForce® MCP79MX RAM: 4GB 1067MHz DDR3 SDRAM Graphics: SLi NVIDIA® GeForce® 9500M - 256MB Thanks for your advice, if there is anything additional i need to buy an you have a personal preference pass the brand name so i can check it out. Thanks!

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• ESXi 5 network performance is slow

  - by R D

  We just did a fresh install of ESXi 5 on a host that was running ESX 4 before. Nothing has changed hardware wise. After the upgrade network performance is much slower. Even copying a big file from one VM to another VM within same virtual switch is slower compared to other hosts that are running ESX 4. Network cards are auto-negotiating at 1Gbps as were on ESX 4 prior to upgrade. All settings are default and I haven't played with Advanced Settings at all. Before opening a case with vmware, wanted to know if I am missing something or if others have experienced similar issues and found a fix?

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