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• Can a slow internet-connection corrupt a file?

  - by Tony

  When downloading a big file, can a slow internet connection cause it to corrupt?

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• How to host a scalable social networking app

  - by christopher-mccann

  I am in the middle of developing a social networking application for a very select user niche which could scale to a few million users. Right now I have always hosted applications on RackSpace Cloud and I have no issues with them at all - always been a really good service and never had any downtime. My question is though does anyone think that cloud computing is not the way to host scalable web apps? Or can anyone with experience of this recommend a better solution. I have always shunned trying to run big servers from my own facilities as I think it seems silly to go to the expense of bringing in big alternative power supplies and all the other necessary precautions when other companies already do this. I looked at managed hosting services but this proved to be a bit too expensive for us at the start and the scalability of it wasnt good enough - it would take a day or two to get a new server provisioned. Therefore I ended up on a cloud platform. If anyone has any recommendations or advice it would be greatly appreciated.

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• How to Use 3 Monitors

  - by The.Anti.9

  Right now my setup has a nice big 24" flatscreen in the center, and a 19" flatscreen to the left. And a big gaping hole on the right. I have a 3rd monitor to put there, but I'm not sure how to get the computer to recognize it. Do I need a graphics card with 3 ports? Or can I span the monitors over non SLI-Linked graphics cards? Is it possible to plug my 3rd monitor into the on-board VGA port and have it work?

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• How do I decrease the window shadow in Mac OS X?

  - by NV

  I've found the default 40px Mac OS X window shadow too big: Is it possible to decrease it to, say, 4px?

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• Searching For a Desktop Security Software to harden Windows machines, anybody?

  - by MosheH

  I'm a network administrator of a small/medium network. I'm looking for a software (Free or Not) which can harden Windows Computers (XP And Win7) for the propose of hardening standalone desktop computers (not in domain network). Note: The computers are completely isolated (standalone), so i can't use active directory group policy. moreover, there are too many restriction that i need to apply, so it is not particle to set it up manual (one by one). Basically what I’m looking for is a software that can restrict and disable access for specific user accounts on the system. For Example: User john can only open one application and nothing else -- He don’t see no icon on the desktop or start menu, except for one or two applications which i want to allow. He can't Right click on the desktop, the task-bar icons are not shown, there is no folder options, etc... User marry can open a specific application and copy data to one folder on D drive. User Dan, have access to all drives but cannot install software, and so on... So far ,I've found only the following solutions, but they all seems to miss one or more feature: Desktop restriction Software 1. Faronics WINSelect The application seems to answer most of our needs except one feature which is very important to us but seems to be missing from WINSelect, which is "restriction per profile". WINSelect only allow to set up restrictions which are applied system-wide. If I have multiple user accounts on the system and want to apply different restrictions for each user, I cant. Deskman (No Restriction per user)- Same thing, no restriction per profile. Desktop Security Rx - not relevant, No Win7 Support. The only software that I've found which is offering a restriction per profile is " 1st Security Agent ". but its GUI is very complicated and not very intuitive. It's worth to mention that I'm not looking for "Internet Kiosk software" although they share some features with the one I need. All I need is a software (like http://www.faronics.com/standard/winselect/) that is offering a way to restrict Windows user interface. So if anybody know an Hardening software which allows to set-up user restrictions on Windows systems, It will be a big, big, big help for me! Thanks to you all

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• Can I change a MySQL table back and forth between InnoDB and MyISAM without any problems?

  - by Daniel Magliola

  I have a site with a decently big database, 3Gb in size, a couple of tables with a dozen million records. It's currently 100% on MyISAM, and I have the feeling that the server is going slower than it should because of too much locking, so I'd like to try going to InnoDB and see if that makes things better. However, I need to do that directly in production, because obviously without load this doesn't make any difference. However, I'm a bit worried about this, because InnoDB actually has potential to be slower, so the question is: If I convert all tables to InnoDB and it turns out i'm worse off than before, can I go back to MyISAM without losing anything? Can you think of any problems I might encounter? (For example, I know that InnoDB stores all data in ONE big file that only gets bigger, can this be a problem?) Thank you very much Daniel

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• Use an audio/video file from a Linux laptop via USB to be played by Magic Sing ET-23H

  - by AisIceEyes

  I am one of the technical directors of a regular karaoke contest event. For the karaoke contest itself, due to tight budget, we are using what one of the sponsors are providing - Magic Sing ET-23H . The video output of the Magic Sing ET-23H are broadcasted at two big screens that are being shown to the audience and event attendees. When a karaoke contestant provides his / her karaoke video, the video itself is in a readable USB flashdrive and is attached to the USB input of Magic Sing ET-23H. What really bugs me is that the interface of Magic Sing ET-23H are also being broadcasted at the big screen video feeds. The interface of choosing the video file is being seen in the Magic Sing ET-23H - also to the big video screens that are seen by the audience and event goers. I will post in the comments ( if my less than 10 reputation would allow me) the picture of Magic Sing ET-23KH USB input of the device. I always bring my laptop, Acer AS5742-7653, during the regular karaoke event. I'm using my laptop also for tallying of scores from the judges, and also playing audio files from contestants that did not provide a karaoke video. I personally am using different Linux distros, but I next to all the time use my Ubuntu Studio 12.04.3 64bit partition during the regular karaoke contest event. My question is this: Is there a way I can share a temporary video/audio file directly from the laptop I'm using, going to the Magic Sing ET-23H that can broadcast both the video/audio file? Just like how in Window's Avisynth AVS files, or VirtualDub's temporary avi file, or like using ffplay (of ffmpeg), etc. I have researched somewhat the matter and found links in SuperUser.com. Though I can only provide the links at the comments section of this post if my reputation of less than 10 would allow me. I have a hunch it is possible, but I have not fully understood the device being used at the event, Magic Sing ET-23H, if there are other ways for it to broadcast video and audio files besides its USB input. Any help to my current predicament is highly appreciated. Thank you. PS: Since I need at least 10 reputation to post more than 2 links and also post images, I will try to post the image & links at the comments (if my below 10 reputation would allow me).

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• Alternatives to amavis for RAM-bound server

  - by rsuarez

  I'm running a small VPS server that works as web and mail server. It has only 256MB of RAM, and it's sucking 100MB of swap constantly. I've found that one of the culprits is amavis, taking about 30MB of resident memory, and would like to ditch it and use some alternative. I don't have much mail daily, so it being a bit slower wouldn't be a problem. I'd like to avoid Spamassassin altogether, if possible, because it's quite big even if used in offline mode. I'm already using RBLs and a few small blacklists, and used greylisting for a while but abandoned it because it gave me a few problems (don't remember which; I think it was related to not configuring properly white lists for several big ISPs). So, is there some alternative to amavis that I could use without much RAM (and if possible, CPU) usage? Thanks in advance.

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• Ubuntu on an XPS 14 Ultrabook with mSATA cache and 500GB HD - how to partition for dual boot?

  - by JDS

  I am getting an XPS 14 ( http://www.dell.com/us/p/xps-14-l421x/pd ) and I want to dual-boot Windows and Ubuntu. This thing has a 500GB standard HD and a 32GB mSATA that can be used as cache. Does anyone know how this thing is partitioned? Is the OS installed on the mSATA drive and data is on the big HD? Is there a BIOS controller or maybe even a Windows driver that makes the mSATA drive and 500GB HD appear contiguous? I get the impression that something makes the mSATA be used invisibly as cache, but I can't find any technical documentation how that works. My primary concern here is wrt dual-booting Ubuntu. I want to know if I need to partition the mSATA separately, or the big HD, or just partition the "magic" contiguous disk space that appears available to the OS.

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• How would one run a task sequence within a task sequence in SCCM 2012 SP1

  - by BigHomie

  A Shining Example: Inside all of my task sequences I have a group that installs driver packages conditionally based on computer model: And of course, this list does nothing but grow. The fact that it grows isn't a big deal, what is a big deal is that every time it changes I have to manually copy and paste those changes across every task sequence I have, which of course leaves huge room for human error. The same goes for other groups of tasks that are common across task sequences. Looking for a solution where I could centrally manage these tasks, be it link other task sequences to a group within another task sequence, or create a separate task sequence and link to that. I came across a solution by John Marcum (SCCM MVP) that mentioned this ability, but this was a while ago and I can't find the link to it anymore to see if it's even still being updated/maintained, but I'm looking for more of a free solution, or even using Powershell or the ConfigMgr SDK is fine with me, I'm no stranger to either. Update Getting close: http://msdn.microsoft.com/en-us/library/jj217869.aspx

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• MySQL Locking Up

  - by Ian

  I've got a innodb table that gets a lot of reads and almost no writes (like, 1 write for every 400,000 reads approx). I'm running into a pretty big problem though when I do INSERT into the table. MySQL completely locks up. It uses 100% cpu, and every single other table (in other databases even) have their statuses set to "Locked" until the INSERT is done. This is a big problem because MySQL stays locked up for up to 4 minutes. I'm using version 5.1.47 (rpm from mysql.com). Any ideas?

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• Looking for internet traffic manager software for Windows 7

  - by Semyon Perepelitsa

  I have 128 KB/s (1 Mbit/s) internet connection. Not quite fast for downloading big files, but it is okay for internet browsing. When I start big file dowload, I cannot surf the web normally: pages appears slowly, especially pictures there. Therefore I pause downloading, but I'm regularly spending much time on reading articles or leaving the computer alone, when I can allow the file being dowloaded. Is there any software that can automize the process of pausing and resuming download or simply automatically regulate internet speed for each application using Internet? I download files using different software and protocols (Download Master for http, ftp; uTorrent for torrents; many other programs for updating themselves), so I don't want to be tied to particular program for downloading.

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• Network monitoring library, or objects, for a cloud

  - by Andrew Smith

  I am looking for library to support server / switch monitoring, to actually be able to check with the device if it's working OK. However this requires some sort of auto-detection and device support. Basically I need to automatically detect a new device, start monitoring it like CPU and PING. So how do I auto-detect the machine remotely, this is something I need library for. Rackspace has something like this - "Cloud Monitoring API". But is there anything opensource which can be used same way? The Nagios and others doesnt have such API, and the big and expensive systems are too big to handle in public cloud, so there must be some other network monitoring engine with API, which can add a new servers automatically and support user isolation for example so I dont see other servers except mine.

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• I want to make my Application Open Source, but I'm unsure...

  - by Joern

  Hi! I have written a website, which is my big idea. Now I'm planning a version for intranets. The big question in my head is: "shall I make it open source?" and next are: What do I have to prepare What do I need for a good start What is the best way to find people with the same interests Who gives me the proof that I won't find a copy of my idea on another page, stolen from my open source code Please Discuss with me, give some good arguments pro and contra. Yours, Joern.

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• Little server for a little network: Asus TS Mini + Windows Home Server or other?

  - by microspino

  Hello, I'm building a little network with 4 computer a plotter, 3 printers an a HP Fax/Scan/Copy/Print machine. The network is connected to the web by a D-Link router/firewall. I would like to add little server to have file sharing (reachable via VPN from outside by a single user-road-warrior), automatic backups. I would like to avoid big electrics bills or, to say It in a green way, I would like to avoid useless power consumption made by a big server with hot-plug, Raid, double PSU because I don't need all this stuff. The server must work 24/7 and the budget is between 400€ and 1000€. I'm evaluating the Asus EEE Box (with XP), a TranquilPC (with XP), a FitPC (again with XP), and an Asus TS Mini (with Windows Home Server). I like the latter but since I'm Europe I don't know where I can buy It. Do you have any suggestion/experience to share with me about: which hardware do I have to buy ? which O.S. ?

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• ionice idle is ignored

  - by Ferran Basora

  I have been testing the ionice command for a while and the idle (3) mode seems to be ignored in most cases. My test is to run both command at the same time: du <big folder> ionice -c 3 du <another big folder> If I check both process in iotop I see no difference in the percentage of io utilization for each process. To provide more information about the CFQ scheduler I'm using a 3.5.0 linux kernel. I started doing this test because I'm experimenting a system lag each time a daily cron job updatedb.mlocate is executed in my Ubuntu 12.10 machine. If you check the /etc/cron.daily/mlocate file you realize that the command is executed like: /usr/bin/ionice -c3 /usr/bin/updatedb.mlocate Also, the funny thing is that whenever my system for some reason starts using swap memory, the updatedb.mlocate io process is been scheduled faster than kswapd0 process, and then my system gets stuck. Some suggestion? References: http://ubuntuforums.org/showthread.php?t=1243951&page=2 https://bugs.launchpad.net/ubuntu/+source/findutils/+bug/332790

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• Backup software for Ubuntu - which one?

  - by Industrial

  Hi everybody, I have spent some time testing out different backup solutions for my small home office during the last weeks, but still haven't found anything that have been working out too well yet. We can definitely work with a non-GUI script if that's what it takes, if only the requirements are fulfilled: Upload to Amazon S3 Europe. We get unbelievable slow uploading speed to US, so uploading 400+ GB of data will not be happening anytime this year... Incremental backups - only changed files shall be uploaded or we will have a big bill from Amazon in the end of each month.. Files should not be uploaded in one big per-folder archive. This is not efficient at all, since if we change one file in a subfolder, a huge two-digit GB sized file would have to be uploaded during next backup. Not good for economy again, or traffic overhead on our internet connection. What options are available to us? Thanks!

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• How can I get Dreamscene wallpapers to change randomly in Win7?

  - by andygrunt

  Having only recently moved over from Windows XP to Windows 7, I’m a big fan of the ‘Dreamscene’ animated wallpaper. I’m also a big fan of the Win 7 ability to select a group of still wallpaper bitmaps and set it to randomly change wallpapers every ‘X’ minutes/hours. What I want is the ability to do the same with the dreamscene animated wallpapers, i.e. select a group and they randomly change every ‘X’ minutes. Beyond that, I’d also like to be able to select a group of stills and animated wallpapers and randomly change between them.

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• Small WiFi Network In a Noisy Environment

  - by Sam Skuce

  My company is demoing our network enabled products at big conferences. For this purpose, we would like to be able to set up a small WiFi network in our booth with a range of less than 10 meters. We will only be connecting the device that we are demoing and the iPad or PC running our demo software. I understand that there are conferences that won't allow you to run your own WiFi equipment, but some fairly big ones do (e.g. IMTS, which we were just at). I know that the AP should be encrypted and not broadcast its SSID, but are there additional equipment considerations to deal with the high level of RF noise in such an environment? Is there a particular technology that I should be looking at?

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• A training world nugget for being taught by the best

  - by Testas

  June represents an exciting time for the SQL Server community with events all over the country in the next few months and there is plenty of knowledge to be gained from willing speakers enthusiastically sharing their knowledge. Furthermore, Paul Randall and Kimberley Trip will be conducting their highly recommended immersion events at London Heathrow in June.There are other big names within SQL Server that will be teaching this year. The company I used to work for, QA, has excellent trainers teaching SQL Server who I would always recommend. Occasionally a big name speaker will be take a course, unknowingly to the community. Solid Quality Mentors is such a company where their staff will teach at QA offices from time to time. And I know from conversation with Itzik Ben-Gan that he will be teaching Advanced TSQL within QA offices in London during the week of Oct 3-7. A link to the course details can be found here.http://www.qa.com/training-courses/technical-it-training/microsoft/microsoft-sql-server/microsoft-sql-server-2008-and-r2/advanced-t-sql-querying,-programming-and-tuning-for-sql-server-2005--2008So if you want to be taught by the best experts, consider checking www.QA.com for their advanced SQL courses, you could find yourself being taught by the best in the business in their field.Chris  

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• What You Need to Know About Windows 8.1

  - by Chris Hoffman

  Windows 8.1 is available to everyone starting today, October 19. The latest version of Windows improves on Windows 8 in every way. It’s a big upgrade, whether you use the desktop or new touch-optimized interface. The latest version of Windows has been dubbed “an apology” by some — it’s definitely more at home on a desktop PC than Windows 8 was. However, it also offers a more fleshed out and mature tablet experience. How to Get Windows 8.1 For Windows 8 users, Windows 8.1 is completely free. It will be available as a download from the Windows Store — that’s the “Store” app in the Modern, tiled interface. Assuming upgrading to the final version will be just like upgrading to the preview version, you’ll likely see a “Get Windows 8.1″ pop-up that will take you to the Windows Store and guide you through the download process. You’ll also be able to download ISO images of Windows 8.1, so can perform a clean install to upgrade. On any new computer, you can just install Windows 8.1 without going through Windows 8. New computers will start to ship with Windows 8.1 and boxed copies of Windows 8 will be replaced by boxed copies of Windows 8.1. If you’re using Windows 7 or a previous version of Windows, the update won’t be free. Getting Windows 8.1 will cost you the same amount as a full copy of Windows 8 — $120 for the standard version. If you’re an average Windows 7 user, you’re likely better off waiting until you buy a new PC with Windows 8.1 included rather than spend this amount of money to upgrade. Improvements for Desktop Users Some have dubbed Windows 8.1 “an apology” from Microsoft, although you certainly won’t see Microsoft referring to it this way. Either way, Steven Sinofsky, who presided over Windows 8′s development, left the company shortly after Windows 8 was released. Coincidentally, Windows 8.1 contains many features that Steven Sinofsky and Microsoft refused to implement. Windows 8.1 offers the following big improvements for desktop users: Boot to Desktop: You can now log in directly to the desktop, skipping the tiled interface entirely. Disable Top-Left and Top-Right Hot Corners: The app switcher and charms bar won’t appear when you move your mouse to the top-left or top-right corners of the screen if you enable this option. No more intrusions into the desktop. The Start Button Returns: Windows 8.1 brings back an always-present Start button on the desktop taskbar, dramatically improving discoverability for new Windows 8 users and providing a bigger mouse target for remote desktops and virtual machines. Crucially, the Start menu isn’t back — clicking this button will open the full-screen Modern interface. Start menu replacements will continue to function on Windows 8.1, offering more traditional Start menus. Show All Apps By Default: Luckily, you can hide the Start screen and its tiles almost entirely. Windows 8.1 can be configured to show a full-screen list of all your installed apps when you click the Start button, with desktop apps prioritized. The only real difference is that the Start menu is now a full-screen interface. Shut Down or Restart From Start Button: You can now right-click the Start button to access Shut down, Restart, and other power options in just as many clicks as you could on Windows 7. Shared Start Screen and Desktop Backgrounds; Windows 8 limited you to just a few Steven Sinofsky-approved background images for your Start screen, but Windows 8.1 allows you to use your desktop background on the Start screen. This can make the transition between the Start screen and desktop much less jarring. The tiles or shortcuts appear to be floating above the desktop rather than off in their own separate universe. Unified Search: Unified search is back, so you can start typing and search your programs, settings, and files all at once — no more awkwardly clicking between different categories when trying to open a Control Panel screen or search for a file. These all add up to a big improvement when using Windows 8.1 on the desktop. Microsoft is being much more flexible — the Start menu is full screen, but Microsoft has relented on so many other things and you’d never have to see a tile if you didn’t want to. For more information, read our guide to optimizing Windows 8.1 for a desktop PC. These are just the improvements specifically for desktop users. Windows 8.1 includes other useful features for everyone, such as deep SkyDrive integration that allows you to store your files in the cloud without installing any additional sync programs. Improvements for Touch Users If you have a Windows 8 or Windows RT tablet or another touch-based device you use the interface formerly known as Metro on, you’ll see many other noticeable improvements. Windows 8′s new interface was half-baked when it launched, but it’s now much more capable and mature. App Updates: Windows 8′s included apps were extremely limited in many cases. For example, Internet Explorer 10 could only display ten tabs at a time and the Mail app was a barren experience devoid of features. In Windows 8.1, some apps — like Xbox Music — have been redesigned from scratch, Internet Explorer allows you to display a tab bar on-screen all the time, while apps like Mail have accumulated quite a few useful features. The Windows Store app has been entirely redesigned and is less awkward to browse. Snap Improvements: Windows 8′s Snap feature was a toy, allowing you to snap one app to a small sidebar at one side of your screen while another app consumed most of your screen. Windows 8.1 allows you to snap two apps side-by-side, seeing each app’s full interface at once. On larger displays, you can even snap three or four apps at once. Windows 8′s ability to use multiple apps at once on a tablet is compelling and unmatched by iPads and Android tablets. You can also snap two of the same apps side-by-side — to view two web pages at once, for example. More Comprehensive PC Settings: Windows 8.1 offers a more comprehensive PC settings app, allowing you to change most system settings in a touch-optimized interface. You shouldn’t have to use the desktop Control Panel on a tablet anymore — or at least not as often. Touch-Optimized File Browsing: Microsoft’s SkyDrive app allows you to browse files on your local PC, finally offering a built-in, touch-optimized way to manage files without using the desktop. Help & Tips: Windows 8.1 includes a Help+Tips app that will help guide new users through its new interface, something Microsoft stubbornly refused to add during development. There’s still no “Modern” version of Microsoft Office apps (aside from OneNote), so you’ll still have to head to use desktop Office apps on tablets. It’s not perfect, but the Modern interface doesn’t feel anywhere near as immature anymore. Read our in-depth look at the ways Microsoft’s Modern interface, formerly known as Metro, is improved in Windows 8.1 for more information. In summary, Windows 8.1 is what Windows 8 should have been. All of these improvements are on top of the many great desktop features, security improvements, and all-around battery life and performance optimizations that appeared in Windows 8. If you’re still using Windows 7 and are happy with it, there’s probably no reason to race out and buy a copy of Windows 8.1 at the rather high price of $120. But, if you’re using Windows 8, it’s a big upgrade no matter what you’re doing. If you buy a new PC and it comes with Windows 8.1, you’re getting a much more flexible and comfortable experience. If you’re holding off on buying a new computer because you don’t want Windows 8, give Windows 8.1 a try — yes, it’s different, but Microsoft has compromised on the desktop while making a lot of improvements to the new interface. You just might find that Windows 8.1 is now a worthwhile upgrade, even if you only want to use the desktop.     

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• SQL SERVER – Guest Posts – Feodor Georgiev – The Context of Our Database Environment – Going Beyond the Internal SQL Server Waits – Wait Type – Day 21 of 28

  - by pinaldave

  This guest post is submitted by Feodor. Feodor Georgiev is a SQL Server database specialist with extensive experience of thinking both within and outside the box. He has wide experience of different systems and solutions in the fields of architecture, scalability, performance, etc. Feodor has experience with SQL Server 2000 and later versions, and is certified in SQL Server 2008. In this article Feodor explains the server-client-server process, and concentrated on the mutual waits between client and SQL Server. This is essential in grasping the concept of waits in a ‘global’ application plan. Recently I was asked to write a blog post about the wait statistics in SQL Server and since I had been thinking about writing it for quite some time now, here it is. It is a wide-spread idea that the wait statistics in SQL Server will tell you everything about your performance. Well, almost. Or should I say – barely. The reason for this is that SQL Server is always a part of a bigger system – there are always other players in the game: whether it is a client application, web service, any other kind of data import/export process and so on. In short, the SQL Server surroundings look like this: This means that SQL Server, aside from its internal waits, also depends on external waits and settings. As we can see in the picture above, SQL Server needs to have an interface in order to communicate with the surrounding clients over the network. For this communication, SQL Server uses protocol interfaces. I will not go into detail about which protocols are best, but you can read this article. Also, review the information about the TDS (Tabular data stream). As we all know, our system is only as fast as its slowest component. This means that when we look at our environment as a whole, the SQL Server might be a victim of external pressure, no matter how well we have tuned our database server performance. Let’s dive into an example: let’s say that we have a web server, hosting a web application which is using data from our SQL Server, hosted on another server. The network card of the web server for some reason is malfunctioning (think of a hardware failure, driver failure, or just improper setup) and does not send/receive data faster than 10Mbs. On the other end, our SQL Server will not be able to send/receive data at a faster rate either. This means that the application users will notify the support team and will say: “My data is coming very slow.” Now, let’s move on to a bit more exciting example: imagine that there is a similar setup as the example above – one web server and one database server, and the application is not using any stored procedure calls, but instead for every user request the application is sending 80kb query over the network to the SQL Server. (I really thought this does not happen in real life until I saw it one day.) So, what happens in this case? To make things worse, let’s say that the 80kb query text is submitted from the application to the SQL Server at least 100 times per minute, and as often as 300 times per minute in peak times. Here is what happens: in order for this query to reach the SQL Server, it will have to be broken into a of number network packets (according to the packet size settings) – and will travel over the network. On the other side, our SQL Server network card will receive the packets, will pass them to our network layer, the packets will get assembled, and eventually SQL Server will start processing the query – parsing, allegorizing, generating the query execution plan and so on. So far, we have already had a serious network overhead by waiting for the packets to reach our Database Engine. There will certainly be some processing overhead – until the database engine deals with the 80kb query and its 20 subqueries. The waits you see in the DMVs are actually collected from the point the query reaches the SQL Server and the packets are assembled. Let’s say that our query is processed and it finally returns 15000 rows. These rows have a certain size as well, depending on the data types returned. This means that the data will have converted to packages (depending on the network size package settings) and will have to reach the application server. There will also be waits, however, this time you will be able to see a wait type in the DMVs called ASYNC_NETWORK_IO. What this wait type indicates is that the client is not consuming the data fast enough and the network buffers are filling up. Recently Pinal Dave posted a blog on Client Statistics. What Client Statistics does is captures the physical flow characteristics of the query between the client(Management Studio, in this case) and the server and back to the client. As you see in the image, there are three categories: Query Profile Statistics, Network Statistics and Time Statistics. Number of server roundtrips–a roundtrip consists of a request sent to the server and a reply from the server to the client. For example, if your query has three select statements, and they are separated by ‘GO’ command, then there will be three different roundtrips. TDS Packets sent from the client – TDS (tabular data stream) is the language which SQL Server speaks, and in order for applications to communicate with SQL Server, they need to pack the requests in TDS packets. TDS Packets sent from the client is the number of packets sent from the client; in case the request is large, then it may need more buffers, and eventually might even need more server roundtrips. TDS packets received from server –is the TDS packets sent by the server to the client during the query execution. Bytes sent from client – is the volume of the data set to our SQL Server, measured in bytes; i.e. how big of a query we have sent to the SQL Server. This is why it is best to use stored procedures, since the reusable code (which already exists as an object in the SQL Server) will only be called as a name of procedure + parameters, and this will minimize the network pressure. Bytes received from server – is the amount of data the SQL Server has sent to the client, measured in bytes. Depending on the number of rows and the datatypes involved, this number will vary. But still, think about the network load when you request data from SQL Server. Client processing time – is the amount of time spent in milliseconds between the first received response packet and the last received response packet by the client. Wait time on server replies – is the time in milliseconds between the last request packet which left the client and the first response packet which came back from the server to the client. Total execution time – is the sum of client processing time and wait time on server replies (the SQL Server internal processing time) Here is an illustration of the Client-server communication model which should help you understand the mutual waits in a client-server environment. Keep in mind that a query with a large ‘wait time on server replies’ means the server took a long time to produce the very first row. This is usual on queries that have operators that need the entire sub-query to evaluate before they proceed (for example, sort and top operators). However, a query with a very short ‘wait time on server replies’ means that the query was able to return the first row fast. However a long ‘client processing time’ does not necessarily imply the client spent a lot of time processing and the server was blocked waiting on the client. It can simply mean that the server continued to return rows from the result and this is how long it took until the very last row was returned. The bottom line is that developers and DBAs should work together and think carefully of the resource utilization in the client-server environment. From experience I can say that so far I have seen only cases when the application developers and the Database developers are on their own and do not ask questions about the other party’s world. I would recommend using the Client Statistics tool during new development to track the performance of the queries, and also to find a synchronous way of utilizing resources between the client – server – client. Here is another example: think about similar setup as above, but add another server to the game. Let’s say that we keep our media on a separate server, and together with the data from our SQL Server we need to display some images on the webpage requested by our user. No matter how simple or complicated the logic to get the images is, if the images are 500kb each our users will get the page slowly and they will still think that there is something wrong with our data. Anyway, I don’t mean to get carried away too far from SQL Server. Instead, what I would like to say is that DBAs should also be aware of ‘the big picture’. I wrote a blog post a while back on this topic, and if you are interested, you can read it here about the big picture. And finally, here are some guidelines for monitoring the network performance and improving it: Run a trace and outline all queries that return more than 1000 rows (in Profiler you can actually filter and sort the captured trace by number of returned rows). This is not a set number; it is more of a guideline. The general thought is that no application user can consume that many rows at once. Ask yourself and your fellow-developers: ‘why?’. Monitor your network counters in Perfmon: Network Interface:Output queue length, Redirector:Network errors/sec, TCPv4: Segments retransmitted/sec and so on. Make sure to establish a good friendship with your network administrator (buy them coffee, for example J ) and get into a conversation about the network settings. Have them explain to you how the network cards are setup – are they standalone, are they ‘teamed’, what are the settings – full duplex and so on. Find some time to read a bit about networking. In this short blog post I hope I have turned your attention to ‘the big picture’ and the fact that there are other factors affecting our SQL Server, aside from its internal workings. As a further reading I would still highly recommend the Wait Stats series on this blog, also I would recommend you have the coffee break conversation with your network admin as soon as possible. This guest post is written by Feodor Georgiev. Read all the post in the Wait Types and Queue series. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, Readers Contribution, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQL Wait Stats, SQL Wait Types, T SQL

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• Turning a board game idea into a browser based, slow paced gameplay

  - by guillaume31

  Suppose I want to create a strategy game with global mutable state shared between all players (think game board). But unlike a board game, I don't want it to be real time action and/or turn-based. Instead, players should be able to log in at any time of the day and spend a fixed number of action points per day as they wish. As opposed to a few hours, game sessions would run over a few weeks. This is meant to reward good strategy rather than time spent playing (as an alternative, hardcore players could always play multiple games in parallel instead) as well as all kind of issues related to live playing like disconnections and synchronization. The game should remain addictive still have a low time investment footprint for casual players. So far so good, but this still leaves open the question of when to solve actions and when they should be visible. I want to avoid "ninja play" like doing all your moves just a few minutes before daily point reset to take other players by surprise, or people spamming F5 to place a well-timed action which would defeat the whole point of a non real-time game. I thought of a couple of approaches to that : Resolve all events in a single scheduled process running once a day. This basically means a "blind" gameplay where players can take actions but don't see their results immediately. The thing is, I played a similar browser game a few years ago and didn't like the fact that you feel disconnected and powerless until there's that deus ex machina telling you what really happened during all that time. You see the world evolve in large increments of one day, which often doesn't seem like seeing it evolve at all. For actions that have an big impact on the game or on other players (attacks, big achievements), make them visible to everyone immediately but delay their effect by something like 24 hours. Opposing players could be notified when such an event happens, so that they can react to it. Do you have any other ideas how I could go about solving this ? Are there any known approaches in similar existing games ?

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• Oracle Cloud Solutions at Cloud Expo West

  - by Gene Eun

  Oracle is proud to be the Platinum Sponsor at next week's Cloud Expo West in Santa Clara (Nov 4-7).  This is the third consecutive year that Oracle has been sponsoring Cloud Expo and each year our involvement and presence at the conference has grown. This year, we have a great lineup of sessions which I've listed below. If you’re attending Cloud Expo West, we'd love to have you attend our sessions that will show our thought leadership and leading solutions in the cloud. You should also swing by Booth #130 to see some of our latest cloud offerings firsthand. Date  Time  Session Title  Track  Room  Monday, Nov 4  3:00 pm - 3:45 pm Ten Myths of Cloud Computing - General Session All Tracks Ballroom A-H  Monday, Nov 4  5:10 pm - 5:55 pm Driving Recurring Revenue Streams Through Cloud Billing Cloud Computing and Big Data M1  Monday, Nov 4  5:10 pm - 5:55 pm An Introduction to Oracle's Cloud Application Marketplace Cloud Bootcamp Great America Room J  Tuesday, Nov 5  6:25 pm - 7:05 pm Delivering Database as a Service with Oracle Database 12c Deploying the Cloud Great America Room 2  Wednesday, Nov 6  5:35 pm - 6:20 pm Accelerating Your Journey to Self-Service IT Enterprise Cloud Computing B2  Thursday, Nov 7  1:35 pm - 2:20 pm Oracle's Strategy for Public Cloud Platform and Infrastructure Services Infrastructure Management | Virtualization M2 At Cloud Expo West, you'll get to learn about and experience the latest in Cloud and Big Data. If you're in Silicon Valley or the Bay Area and don't have a pass to Cloud Expo, no problem. Oracle is giving away FREE VIP Gold Passes! We would love to have you be our VIP guest. Just go to Oracle's Cloud Expo 2013 event registration page and follow the instructions to get your complimentary pass. Stay tuned to this blog and follow us on Twitter (@OracleCloudZone) during and after Cloud Expo for more of our insight and observations about this year's conference.

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• FY13 Partner Kickoff Kick’s off Summer Right

  - by Kristin Rose

  This summer’s blockbuster movie lineup is far from disappointing – From the Avengers to Prometheus and The Dark Knight Rises, there is no shortage of ‘cling-to-your-seat’ entertainment in store, not to mention buttery popcorn fingers. Will all this big screen action taking place, Oracle wanted to take part in some big premiers of its own, which is why we are happy to announce that our FY13 Partner Kickoff event is taking place June 26th. This year we are welcoming several partners from around the globe in person to Oracle’s Headquarters, as well as another 22,000 partners tuning in to help us kickoff FY13. Hosted by Judson Althoff, SVP of WWA&C, the Oracle PartnerNetwork FY13 Kickoff is being held live — five times throughout the day — and will include a special message for each region.  Have a look at the schedule of shows below: EMEA Kickoff – Tuesday, June 26 @ 2:00 pm BST (London) LAD Kickoff – Tuesday, June 26 @ 4:00 pm UTC (San Paulo) North America Kickoff – Tuesday, June 26 @ 8:30 am PT (San Francisco) Japan Kickoff – Wednesday, June 27 @ 10:00 am JST (Tokyo) Asia Pacific Kickoff – Wednesday, June 27 @ 8:30 am IST (Bangalore) / 11:00 am SGT (Singapore) / 1:00 pm AEST (Sydney) Partners near and far will be able to get a first row seat to some exciting Oracle announcements, keynotes, round-tables and a live after-show event hosted by Nick Kritikos, VP of Partner Enablement. Did we mention there is an exciting online component which will allow partners to send in questions or comments and get them answered in real time? Now that deserves two thumbs up!So whether you’re partial to Milk Duds or Junior Mints, grab a box of your favorite candy and sign-up for this strategy driven, partner focused blockbuster event. To get a sneak-peek at what’s in store, watch this short PKO “trailer” below, starring our very own GVP of WWA&C, Lydia Smyers to find out more.   To the Depths and Back,The OPN Communications Team

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