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• What are the Crappy Code Games - Tips on how to win?

  - by simonsabin

  This is part of a series on the Crappy Code Games The background Who can enter? What are the challenges? What are the prizes? Why should I attend? Tips on how to win Tips on how to win Each test has some different aspect that will define how you win. In this post we will give you some tips on how to try and win. As a starter why not watch some of the sessions from previous SQLBits Storage sessions Sessions on IO The background Who can enter? What are the challenges? What are the prizes? Why should...(read more)

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• My laptop hangs a lot

  - by Salahuddin

  My laptop is 1G ram and 120G hard-disk 1.68HZ processor , I've both Ubuntu and Windows7 on my machine For the last few days, my laptop, running Ubuntu 11.10 has been hanging a lot. A lot of the time, the touchpad won't work for unknown reasons, and I have to connect a USB mouse to be able to move the pointer on the screen. When browsing the web, the browser hangs a lot, and I have to restart the laptop to refresh it. I know that there is a hotkey to force Ubuntu to refresh when it hangs, but it doesn't work here.These problems happens only on ubuntu not on windows 7... How do I make Ubuntu light and fast? Help me, please.

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• What is Rainbow (not the CMS)

  - by Jeremy Thompson

  I was reading this excellent blog article regarding speeding up the badge page and in the last comment the author @waffles (a.k.a Sam Saffron) mentions these tools: dapper and a bunch of custom helpers like rainbow, sql builder etc Dapper and sql builder was easy to look up but rainbow keeps pointing me to a CMS, can someone please point me to the real source? Thanks. Obviously the architecture of these [SE] sites is uber cool and ultra fast so no comments on that thanks.

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• Need to Determine the Engine Status?

  - by user702295

  If you need to establish the status of the engine, begin with this SQL: select status, engine, engine_version,fore_column_name from dm.forecast_history The status of an engine run is stored in the FORECAST_HISTORY table, in the “status” field.  We can also find in that table the FORE_COLUMN_NAME field. This field includes the name of the column in SALES_DATA in which the relevant forecast is stored. Here are the possible statuses: -1, -2 : The engine failed in the initialization phase.  Which means, before the engine manager created the engines.  0 : The engine stopped in the optimization phase.  Which means, after the engines were created.  1: The engine finished the run successfully.  2: Forecast was never calculated for the relevant column that is mentioned in FORE_COLUMN_NAME.  

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• Openbox overhead is similar to that with gnome-panel

  - by drN

  I just installed openbox via sudo apt-get install openbox. It already has obconf, btw. I noticed that when I logged into my openbox session instead of the one I usually use (gnome-panel and NOT Ubuntu 2D or one of the high overhead environments) and checked via htop, I found that a similar amount of RAM was being occupied (~600 MB or so) with openbox or gnome-panel. What gives? Openbox looks lighter but it certainly isn't any different. Obviously the same daemons etc would run in both environments as they share the same folders. Is gnome-panel as good as openbox then?

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• Optimized algorithm for line-sphere intersection in GLSL

  - by fernacolo

  Well, hello then! I need to find intersection between line and sphere in GLSL. Right now my solution is based on Paul Bourke's page and was ported to GLSL this way: // The line passes through p1 and p2: vec3 p1 = (...); vec3 p2 = (...); // Sphere center is p3, radius is r: vec3 p3 = (...); float r = ...; float x1 = p1.x; float y1 = p1.y; float z1 = p1.z; float x2 = p2.x; float y2 = p2.y; float z2 = p2.z; float x3 = p3.x; float y3 = p3.y; float z3 = p3.z; float dx = x2 - x1; float dy = y2 - y1; float dz = z2 - z1; float a = dx*dx + dy*dy + dz*dz; float b = 2.0 * (dx * (x1 - x3) + dy * (y1 - y3) + dz * (z1 - z3)); float c = x3*x3 + y3*y3 + z3*z3 + x1*x1 + y1*y1 + z1*z1 - 2.0 * (x3*x1 + y3*y1 + z3*z1) - r*r; float test = b*b - 4.0*a*c; if (test >= 0.0) { // Hit (according to Treebeard, "a fine hit"). float u = (-b - sqrt(test)) / (2.0 * a); vec3 hitp = p1 + u * (p2 - p1); // Now use hitp. } It works perfectly! But it seems slow... I'm new at GLSL. You can answer this questions in two ways: Tell me there is no solution, showing some proof or strong evidence. Tell me about GLSL features (vector APIs, primitive operations) that makes the above algorithm faster, showing some example. Thanks a lot!

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• Different ways to pass Textures into HLSL shaders

  - by codymanix

  The GraphicsDevice class of xna 4 has the properties Textures and VertexTextures. What is the exact difference? I don't really understand what MSDN tells me about this. I usually use Effect parameters to pass textures to my HLSL shaders. What are the differences between these methods, which is faster? My Scenario: I am working on a minecraft like game, which means lots of separate DrawPrimitives calls and change current Texture often since I have lots of different block types. Since I use an Octtree to organize the world, I cannot easily sort by texture.

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• Updates to the Demantra Partial Schema Exporter Tool, Patch 13930627, are Available.

  - by user702295

  Hello!  Updates to the Demantra Partial Schema Exporter Tool, Patch 13930627, are Available. This is an updated re-release of the generic Partial Schema Exporter Tool.  The generic patch is for 7.3.1.x and 12.2.x. TABLE_REORG was introduced in 7.3.1.3 12.2.0.  Therefore for 7.3.1.x the schema must be at 7.3.1.3 or above. This is build 3 of the patch. It contains fixes for the following bugs - BUG 17495971 - DEMANTRA 12.2 - CUMULATIVE HISTORY NOT CORRECT   It now only uses DATA_PUMP COMPRESSION only on Enterprise Edition for 11g and and up. - Bug 17452153 - 1OFF:16086475:TRYING TO FILTER DROP DOWN IN A METHOD CALL USING MORE THAN 1 ATTR   It now builds GL level filters with and without the GL id column where applicable. These bugs are also fixed in 7.3.1.6 and 12.2.3.

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• Deletes that Split Pages and Forwarded Ghosts

  - by Paul White

  Can DELETE operations cause pages to split? Yes. It sounds counter-intuitive on the face of it; deleting rows frees up space on a page, and page splitting occurs when a page needs additional space. Nevertheless, there are circumstances when deleting rows causes them to expand before they can be deleted. The mechanism at work here is row versioning (extract from Books Online below): Isolation Levels The relationship between row-versioning isolation levels (the first bullet point) and page splits is...(read more)

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• Is there a perf hit using mule as a container vs. standard JEE container like Weblogic?

  - by Victor Grazi

  Our team is considering using Mule in a large scale medium volume internal facing transactional banking application. At first Mule would just be used as an application server although it is possible some of its esb/orchestration features would be used in the future. I have no experience with mule, being new on the team. But my gut says Mule would not be as performant as Weblogic or Glassfish as a deployment container. Does anyone have any comparison stories to share that might shed light?

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• SCOM, 90 Days In, I

  - by merrillaldrich

  At my office we’re about 90 days into our implementation of System Center Operations Manager for Windows Server and SQL Server monitoring. All in all it’s been a good experience, and I’m really excited to have access to this tool. I’ve logged a fair number of years as a DBA on products like Idera’s SQL Diagnostic Manager and Quest Spotlight on SQL Server Enterprise (and “roll-your-own” solutions) in smaller environments, and liked them, but they always, in my experience, struggled with really large...(read more)

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• What are the Crappy Code Games - Who can enter?

  - by simonsabin

  This is part of a series on the Crappy Code Games The background Who can enter? What are the challenges? What are the prizes? Why should I attend? Tips on how to win Who can enter? Anyone can enter the competition, whats more anyone can just come along for the evening. All the evenings are aimed at being a social evening with food and drink. So just think of them as usergroup meetings with The evening will have lots of SQL bods in attendance and I'll be trying to help out anyone that wants some...(read more)

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• Store image as logic file (in db by using binary format) or physical file (in the server)

  - by Michel Ayres

  In those study cases of image storage, An image that change only once in a while, if it changes at all (like an image for an article) The image case from above is not only one image but over 10, that link to the same article An image that have changes very often (like a banner image for a website) The image above is huge What is the best approach for each case? What is the "right/faster" way to do this task in each scenario ?

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• Triple buffering causes input lag?

  - by user782220

  Consider some time in between two vsyncs. Suppose the first display buffer is being used to display the current image, and suppose the game was really fast and computed and rendered the next image to the second display buffer and the next one after that to the third display buffer. That is the rendering to the second and third display buffer happens so fast that it occurs before the next vsync. Suppose input from the user comes in now. What you would like is for the results of the input to show up on the next vsync or (probably more typical) the vsync after that. However, with the third display buffer already rendered the input can only effect the image after that. Meaning the input will only take effect at best 3 vsyncs later. I wish i had an image to show the exact timings of what I mean.

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• Make OpenGL game perform better

  - by Csabi

  I have programmed an OpenGL game which just contains one F1 car and a track. It is very simple and only uses around of 10'000 - 20'000 triangles. It should run on any PC but it won't, it needs a really good graphics-card to run at a decent framerate. Can you write some methods or links to sites which would help me make my scene/game more efective? my game can be downloaded from here or directly from here

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• How should we deal with multiple transaction-report requests?

  - by Mithir

  We are developing a system for the retail market which one of it's features will enable clients(actually consumer clubs) to go through all transactions made by end-clients. One of the ways to get this information will be via an API. The idea is that there will be requests for reports with a start date and an end date, and a response will have all the transactions between those dates. We are worry that some reports may be very large, and that some clients will repeatedly request for reports, in this case the DB and CPU will be very overloaded. The same server that will service those requests, also takes care the the actual retail transactions (received by proprietary devices) and a Web application. We are not sure about how to limit the report requests from the API so that it won't affect the system too much. So, how should we deal with this scenario? any thoughts? EDIT: just to make clear: When I mentioned proprietary devices I meant "On-Location" devices which are used during sales with end-clients, this means that these requests shouldn't get delayed, and this is the main concern.

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• EPM 11.1.2.1 - Smartview client and HFM office provider

  - by user809526

  If your connection to the smartview provider is very slow, because the login part takes a long time (user directory slowness, ...), consider adding on the desktop side a Windows parameter: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\InternetSettings\ ReceiveTimeout 300000 to avoid being prompted over and over again for username/password This is an addition to the support doc id: "Smart View 11.1.2.1 Keeps Prompting For Username And Password For Financial Management Provider [ID 1353294.1]"

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• Switching mdadm to an external bitmap

  - by Oli

  I've just read this in another post about improving RAID5/6 write speeds: After increasing stripe cache & switching to external bitmap, my speeds are 160 Mb/s writes, 260 Mb/s reads. :-D I've already found out how to increase the stripe cache and this worked pretty well but I'd like to know more about an external bitmap. I have an incredibly fast (540MB/s) RAID0 SSD that would do well if a bitmap does what I think it does but I'm still very unsure. I've only known about them as long as I've known this post. A few questions: What is a bitmap (in terms of mdadm)? What are the advantages of an internal bitmap (over external)? What are the advantages of an external bitmap (over internal)? How do I switch between the two? I should add that while this is a I'm-bored-let's-break-something thread, I do value the data stored on the RAID array. If doing this is going to put data at significant risk, please let me know.

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• The Column Prediction_Status, MDP_Matrix and Engine. How are they Related? Understand Prediction_status Values

  - by user702295

  Do you know what these values are telling you? COUNT(*) PREDICTION_STATUS DO_FORE DO_AGGRI AGGRI_98 AGGRI_99 LEVEL_ID 19854 99 1 1 1 1 3 1077 99 0 1 1 1 0 262691 99 1 1 -1 56 99 0 1 1 1 2 1 98 1 1 1 1 1 99 0 1 1 1 748796 1 1 1 4 351633 1 1 1 1 1 2 1877829 97 1 1 4 840 99 1 1 1 1 27 99 0 1 1 1 3 1 97 1 1 -1 66712 99 1 1 1 1 2 53213 1 1 1 1 1 3 2560 98 1 1 4   Check out The Column Prediction_Status, MDP_Matrix and Engine. How are they Related? Understand Prediction_status Values (Doc ID 1509754.1) This customer is adding an additional processing burden, adding no value.  The incoming data should be scrubbed to eliminate the overhead. 

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• What are the Crappy Code Games - Why should I attend?

  - by simonsabin

  This is part of a series on the Crappy Code Games The background Who can enter? What are the challenges? What are the prizes? Why should I attend? Tips on how to win Why should I attend? The crappy code games isn’t all about winning, its also about having a good time and learning about SQL Server. Even if you don’t want to enter the competition I think its valuable for you to come along to the heats and the final in Brighton as a chance to meat SQL Server bods and also to learn about SQL Server and...(read more)

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• Does connection pooling work fine to execute 60 DB queries to load a page?

  - by willem

  We use Linq2Sql in an ASP.NET application. Unfortunately the eager-loading in Linq2Sql isn't as powerful as in Entity Framework, so a lot of the data has to be lazy loaded as needed. Taking connection pooling into account, is it OK for a web page to execute 60 queries to load a page? Executing a single big query probably won't be much better, as those 60 queries will all those connection pooled connections and not open a new connection each time (which I realize is slow). Any thoughts?

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• Whats a good structure to save and retrieve locations of images?

  - by Goot

  I got a java-ee application, where I collect informations about movies. Im my backend I provide data like the name, description, genre and a random uuid. I also got lots of related files, which are stored on a file server. Including some screenshots, the dvd or bluRay cover and video trailers. My current approach is: When saving the files to the fileserver, I retrieve the movies random uuid (which is the primary key btw.). I then rename the files screenshot_[UUID]_1, screenshot_[UUID]_2 ... etc. Now, there are lots of other ways to handle this, like saving all filenames in a database or creating a dir structure on the fileserver for every uuid and, e.g., return all images in the "[uuid]/screenshots" folder via REST. I expect about 30k requests a day, so the service has to be pretty performant. Whats the best way to solve this?

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• SEO for images: can I use a different (cookieless) domain?

  - by Oliver

  Hello, We want to increase the value of some of our important images by means of SEO, and we want to start serving them from a different, i.e. cookieless, domain. We want to go from http://www.example.com/images/1234.jpg to http://www.example.com/germany/bavaria/landscape.jpg which can easily be done via URL rewriting. Then on the other hand, we would like to serve the image from a completely different domain, let's say http://www.examplestatic.com/germany/bavaria/landscape.jpg, to save the overhead of sending the cookie from www.example.com. Somehow I feel that this is not a good idea because I move the image away from the content by putting it on a different domain. Can anyone shed some light on this problem? Naturally, I would just use a different subdomain, e.g. img.example.com, but we already use subdomains for languages and our cookies are valid for all subdomains of example.com, so this won't help. I'd really appreciate any hints. Cheers,

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• Why are slower programming languages considered worse than faster ones?

  - by Emanuil

  Here's how I see it. There's machine code and it's all that the computers needs in order to run something. The computers don't care about programming languages. It doesn't matter to them if the machine code comes from Perl, Python or PHP. Programming languages exist to serve programmers. Some programming languages run slower then others but that's not because there is something wrong with them. It's often because they do more things that otherwise programmers would do and by doing these things, they do better what they are supposed to do - serve programmers. So why are slower programming languages considered worse than faster ones?

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• How do I know if I'm getting the most out of my video card?

  - by b.long

  My computer at home is a bit lacking, so I want to make sure I'm getting the most out of it while I can. Generally speaking, here are the specs: 4GB Memory AMD Athlon(tm) 64 X2 Dual Core Processor 5200+ × 2 64-bit Ubuntu The terminal shows me the following: me@home:~$ uname -a Linux home 3.0.0-17-generic #30-Ubuntu SMP Thu Mar 8 20:45:39 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux me@home:~$ lspci | grep VGA 01:00.0 VGA compatible controller: ATI Technologies Inc RV380 [Radeon X600 (PCIE)] me@home:~$ sudo lshw -C video *-display:0 description: VGA compatible controller product: RV380 [Radeon X600 (PCIE)] vendor: ATI Technologies Inc physical id: 0 bus info: pci@0000:01:00.0 version: 00 width: 32 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=radeon latency=0 resources: irq:44 memory:e0000000-efffffff ioport:ac00(size=256) memory:fdef0000-fdefffff memory:fdec0000-fdedffff *-display:1 UNCLAIMED description: Display controller product: RV380 [Radeon X600] vendor: ATI Technologies Inc physical id: 0.1 bus info: pci@0000:01:00.1 version: 00 width: 32 bits clock: 33MHz capabilities: pm pciexpress bus_master cap_list configuration: latency=0 resources: memory:fdee0000-fdeeffff me@home:~$ lspci -nn | grep VGA 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc RV380 [Radeon X600 (PCIE)] [1002:5b62] The additional drivers menu in System Settings shows me nothing useful and my attempt at installing ATI's Catalyst Control center (drivers that came with the video card) failed. I believe the latest version of Ubuntu at the time was 9.x. What should I do? Install an old version of Ubuntu 9? Use some alternative driver? UPDATE: I might try my hand at a bit from this answer next: "Installing Catalyst Manually (from AMD/ATI's site)" . From a terminal, fgl_glxgears returns *"fgl_glxgears: command not found"*. Any thoughts?

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