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• Can't establish a DB connection. (Maybe threads related)

  - by JobGovernor

  Hello, I am getting this exception on the Rufus::Scheduler ActiveRecord::ConnectionTimeoutError: could not obtain a database connection within 5 seconds. The max pool size is currently 30; consider increasing it. I've increased the pool from 10 to 30. And I also monkey patched the method which raises the exception to also call ActiveRecord::Base.verify_active_connections! before doing its job. And I also restarted the service which executes the script so that the new code is run. Any ideas would be greatly appreciated. Let me know if you need any other info about environment or whatnot. Thank you.

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• infix formula in the input

  - by gcc

  input: sqrt(2 - sin(3*A/B)^2.5) + 0.5*(C*~(D) + 3.11 +B) a b /*there are values for a,b,c,d */ c d input : sqrt(2 - asin(3*A/B)^2.5) +cos(0.5*(C*~(D)) + 3.11 +B) a b /*there are values for a,b,c,d */ c d input: sqrt(2 - sin(3*A/B)^2.5)/(0.5*(C*~(D)) + sin(3.11) +ln(B)) /*max lenght of formula is 250 characters*/ a b /*there are values for a,b,c,d */ c /*each variable with set of floating numbers*/ d As you can see infix formula in the input depends on user. My program will take a formula and n-tuples value. Then it calculate the results for each value of a,b,c and d. If you wonder I am saying ;outcome of program is graph. I dont know way how to store the formula so that I can do my job with easy. can you show me? a,b,c,d is letters cos,sin,sqrt,ln is function

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• mobile device - different background - media query not working

  - by AMC

  Live site. This is my first attempt at utilizing a different CSS for mobile devices vs. regular screens. To do this, I'm using- @media only screen and (min-device-width : 320px) and (max-device-width : 480px) { background: url('img/background.jpg') no-repeat center center fixed; background-size: cover; height: 100%; } However, it doesn't seem to be working (I can only test on iPhones). Any ideas as to why that may be? I've also tried @media all to no avail.

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• Website Images not indexed by Google, Yahoo and Bing

  - by Nabil Kadimi

  Hi, My classifieds website has been present online since 2006, the html pages are indexed and rank as expected whereas a search on Google Images for site:example.com returns nothing & in Yahoo or Bing it returns only a few image results, 8 to 10. Here is an example of a response HTTP headers as reported by Firebug: Date Sat, 15 Jan 2011 20:38:21 GMT Server Apache Cache-Control max-age=34560000 Expires Sun, 19 Feb 2012 20:38:21 GMT Accept-Ranges bytes Last-Modified Fri, 14 Jan 2011 21:59:16 GMT Vary Accept-Encoding Content-Encoding gzip Content-Length 21675 Connection close Content-Type image/jpeg What should I do to tell search engines to index my website images? Thanks in advance.

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• How can a class's memory-allocated address be determined from within the contructor?

  - by Jim Fell

  Is it possible to get the memory-allocated address of a newly instantiated class from within that class's constructor during execution of said constructor? I am developing a linked list wherein multiple classes have multiple pointers to like classes. Each time a new class instantiates, it needs to check its parent's list to make sure it is included. If I try to do something like this: MyClass() // contructor { extern MyClass * pParent; for ( int i = 0; i < max; i++ ) { pParent->rels[i] == &MyClass; // error } } I get this error: error C2275: 'namespace::MyClass' : illegal use of this type as an expression Any thoughts or suggestions would be appreciated. Thanks.

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• HTML J2ME Problem

  - by Hesham

  i'm trying to put large amount of data in a java me application for a BlackBerry mobile and i noticed that the max file size to be accepted in BlackBerry is 150 KB, by the way i'm developping the application in arabic language so i'm converting every litter to his corresponding unicode so every char gets to 6 chars so its another big problem, some ppl told me that i can write arabic as arabic letters without the need to write its unicode, by viewing the mobile form as an html page, my problem is that i dont know how to view the page as html page and what is XMLParser ?? can anyone help me to get all this together, cos i really need some serious help thank you alot Hesham

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• Application Servers(java) : Should adding RAM to server depend on each domain's -Xmx value?

  - by ring bearer

  We have Glassfish application server running in Linux servers. Each Glassfish installation hosts 3 domains. Each domain has a JVM configuration such as -Xms 1GB and -XmX 2GB. That means if all these three domains are running at max memory, server should be able to allocate total 6GB to the JVMs With that math,each of our server has 8GB RAM (2 GB Buffer) First of all - is this a good approach? I did not think so, because when we analyzed memory utilization on this server over past few months, it was only up to 1GB; Now there are requests to add an additional domain to these servers - does that mean to add additional 2 GB RAM just to be safe or based on trend, continue with whatever memory the server has?

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• C/C++ memory usage API in Linux/Windows

  - by minjang

  I'd like to obtain memory usage information for both per process and system wide. In Windows, it's pretty easy. GetProcessMemoryInfo and GlobalMemoryStatusEx do these jobs greatly and very easily. For example, GetProcessMemoryInfo gives "PeakWorkingSetSize" of the given process. GlobalMemoryStatusEx returns system wide available memory. However, I need to do it on Linux. I'm trying to find Linux system APIs that are equivalent GetProcessMemoryInfo and GlobalMemoryStatusEx. I found 'getrusage'. However, max 'ru_maxrss' (resident set size) in struct rusage is just zero, which is not implemented. Also, I have no idea to get system-wide free memory. Current workaround for it, I'm using "system("ps -p %my_pid -o vsz,rsz");". Manually logging to the file. But, it's dirty and not convenient to process the data. I'd like to know some fancy Linux APIs for this purpose.

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• Two way binding when setter is overriden

  - by Nicolas Goy

  I have an NSTextField bound to some object "zoom" property. In this object's class implementation, I have the following - (void)setZoom:(CGFloat)zoom { _zoom = MAX(0, MIN(10, zoom)); } If I write "-5" in the textfield, setZoom: will be called with "-5" as argument and _zoom will be set to 0. Then problem is that the textfield is not updating itself and it shows "-5" instead of re-reading the property value it has just set. If I do myObject.zoom = -5; in code, the text field will display 0 correctly. I tried to wrap _zoom =... inside willChangeValueForKey/didChangeValueForKey calls but it didn't change anything.

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• How to speed this kind of for-loop?

  - by wok

  I would like to compute the maximum of translated images along the direction of a given axis. I know about ordfilt2, however I would like to avoid using the Image Processing Toolbox. So here is the code I have so far: imInput = imread('tire.tif'); n = 10; imMax = imInput(:, n:end); for i = 1:(n-1) imMax = max(imMax, imInput(:, i:end-(n-i))); end Is it possible to avoid using a for-loop in order to speed the computation up, and, if so, how?

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• join codition in sqlserver

  - by Pallavi

  after applying join condition on two tables i want records which is maximum among records of left table my query SELECT a1.*, t.*, ( a1.trnratefrom - t.trnratefrom )AS minrate, ( a1.trnrateto - t.trnrateto ) AS maxrate FROM (SELECT a.srno, trndate, b.trnsrno, Upper(Rtrim(Ltrim(b.trnstate))) AS trnstate, Upper(Rtrim(Ltrim(b.trnarea))) AS trnarea, Upper(Rtrim(Ltrim(b.trnquality))) AS trnquality, Upper(Rtrim(Ltrim(b.trnlength))) AS trnlength, Upper(Rtrim(Ltrim(b.trnunit))) AS trnunit, b.trnratefrom, b.trnrateto, a.remark, entdate FROM mstprodrates a INNER JOIN trnprodrates b ON a.srno = b.srno)a1 INNER JOIN (SELECT c.srno, trndate, d.trnsrno, Upper(Rtrim(Ltrim(d.trnstate))) AS trnstate, Upper(Rtrim(Ltrim(d.trnarea))) AS trnarea, Upper(Rtrim(Ltrim(d.trnquality))) AS trnquality, Upper(Rtrim(Ltrim(d.trnlength))) AS trnlength, Upper(Rtrim(Ltrim(d.trnunit))) AS trnunit, d.trnratefrom, d.trnrateto, c.remark, entdate FROM mstprodrates c INNER JOIN trnprodrates d ON c.srno = d.srno) AS t ON a1.trnstate = t.trnstate AND a1.trnquality = t.trnquality AND a1.trnunit = t.trnunit AND a1.trnlength = t.trnlength AND a1.trnarea = t.trnarea AND a1.remark = t.remark WHERE t.srno = (SELECT MAX(srno) FROM a1 WHERE srno < a1.srno)

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• Mysql Limit column value repetition N times

  - by Paper-bat

  Hi at all, is my first question here, so be patient ^^ I'll go directly to problem, I have two table Customer (idCustomer, ecc.. ecc..) Comment (idCustomer, idComment, ecc.. ecc..) obviosly the two table are joined togheter, for example SELECT * FROM Comment AS co JOIN Customer AS cu ON cu.idCustomer = co.idCustomer With this I select all comment from that table associated with is Customer, but now I wanna limit the number of Comment by 2 max Comment per Customer. The first thing I see is to use 'GROUP BY cu.idCustomer' but it limit only 1 Comment per Customer, but I wanna 2 Comment per Customer.. how now to proceed?

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• Magento "File was not uploaded"

  - by John

  I'm currently using the magento admin interface, trying to upload an image in the "manage products" and I get the error "file was not uploaded" after I browse the file and click "upload file". I've looked on other forums and the main solution I saw were to make sure that php.ini has the following lines... magic_quotes_gpc = off short_open_tag = on extension=pdo.so extension=pdo_mysql.so I have Windows/IIS with ISAPI_Rewrite. Is there a max file upload size that I can change somewhere. I'm uploading pictures from my local desktop of size ~100kb. help!

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• Even lighter than SQLite

  - by Richard Fabian

  I've been looking for a C++ SQL library implementation that is simple to hook in like SQLite, but faster and smaller. My projects are in games development and there's definitely a cutoff point between needing to pass the ACID test and wanting some extreme performance. I'm willing to move away from SQL string style queries, allowing it to be code driven, but I haven't found anything out there that provides SQL like flexibility while also preferring performance over the ACID test. I don't want to go reinventing the wheel, and the idea of implementing an SQL library on my own is quite daunting, even if it's only going to be simple subset of all the calls you could make. I need the basic commands (SELECT, MODIFY, DELETE, INSERT, with JOIN, and WHERE), not data operations (like sorting, min, max, count) and don't need the database to be atomic, or even enforce consistency (I can use a real SQL service while I'm testing and debugging).

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• Broken count(*) after adding LEFT JOIN

  - by Iain Urquhart

  Since adding the LEFT JOIN to the query below, the count(*) has been returning some strange values, it seems to have added the total rows returned in the query to the 'level': SELECT `n`.*, exp_channel_titles.*, round((`n`.`rgt` - `n`.`lft` - 1) / 2, 0) AS childs, count(*) - 1 + (`n`.`lft` > 1) + 1 AS level, ((min(`p`.`rgt`) - `n`.`rgt` - (`n`.`lft` > 1)) / 2) > 0 AS lower, (((`n`.`lft` - max(`p`.`lft`) > 1))) AS upper FROM `exp_node_tree_6` `n` LEFT JOIN `exp_channel_titles` ON (`n`.`entry_id`=`exp_channel_titles`.`entry_id`), `exp_node_tree_6` `p`, `exp_node_tree_6` WHERE `n`.`lft` BETWEEN `p`.`lft` AND `p`.`rgt` AND ( `p`.`node_id` != `n`.`node_id` OR `n`.`lft` = 1 ) GROUP BY `n`.`node_id` ORDER BY `n`.`lft` I'm totally stumped... Thank you!

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• Spring 3.0 REST implementation or Jersey?

  - by hnilsen

  Hi, SO! I'm currently trying to figure out which implementation of JSR-311 I'm going to recommend further up the food chain. I've pretty much narrowed it down to two options - Spring 3.0 with it's native support for REST - or use Sun's own Jersey (Restlets might also be an option). To me it doesn't seem to be much of a difference in the actual syntax, but there might be issues with performance that I haven't figured out yet. The service is meant to replace some heavy-duty EJB's and make a RESTful Webservice instead. The load is expected to be rather high, up in the 100k users per day (max) range, but will be seriously load balanced. Thanks for all your insights.

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• How to find the entity with the greatest primary key?

  - by simpatico

  I've an entity LearningUnit that has an int primary key. Actually, it has nothing more. Entity Concept has the following relationship with it: @ManyToOne @Size(min=1,max=7) private LearningUnit learningUnit; In a constructor of Concept I need to retrieve the LearningUnit with the greatest primary key. If no LearningUnit exists yet I instantiate one. I then set this.learningUnit to the retrieved/instantied. Finally, I call the empty constructor of Concept in a try-catch block, to have the entitymanager do the cardinality check. If an exception is thrown (I expect one in the case that already another 7 Concepts are referring to the same LearningUnit. In that case, I case instantiate a new LearningUnit with a new greater primary key. Please, also point out, if any, clear pitfalls in my outlined algorithm above.

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• Which file types are worth compressing (zipping) for remote storage? For which of them the compresse

  - by user193655

  I am storing documents in sql server in varbinary(max) fileds, I use filestream optionally when a user has: (DB_Size + Docs_Size) ~> 0.8 * ExpressEdition_Max_DB_Size I am currently zipping all the files, anyway this is done because the Document Read/Write work was developed 10 years ago where Storage was more expensive than now. Many files when zipped are almost as big as the original (a zipped pdf is about 95% of original size). And anyway unzipping has some overhead, that becomes twice when I need also to "Check-in"/Update the file because I need to zip it. So I was thinking of giving to the users the option to choose whether the file type will be zipped or not by providing some meaningful default values. For my experience I would impose the following rules: 1) zip by default: txt, bmp, rtf 2) do not zip by default: jpg, jpeg, Microsoft Office files, Open Office files, png, tif, tiff Could you suggest other file types chosen among the most common or comment on the ones I listed here?

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• What are good uses for Python3's "Function Annotations"

  - by agscala

  Function Annotations: PEP-3107 I ran across a snippet of code demonstrating Python3's function annotations. The concept is simple but I can't think of why these were implemented in Python3 or any good uses for them. Perhaps SO can enlighten me? How it works: def foo(a: 'x', b: 5 + 6, c: list) -> max(2, 9): ... function body ... Everything following the colon after an argument is an 'annotation', and the information following the -> is an annotation for the function's return value. foo.func_annotations would return a dictionary: {'a': 'x', 'b': 11, 'c': list, 'return': 9} What's the significance of having this available?

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• Question About id and Delegate Usage in Obj-C

  - by Stunner

  Ey guys, I am wondering what the following line of code is doing: @property (assign, nonatomic) id <CoursePlannerDelegate> delegate; Namely I am wondering about this portion of the line: id <CoursePlannerDelegate> delegate; It also shows up in other places: @interface CategoryAddViewController : UIViewController { UITextField *nameField, *weightField; double maxWeight; //The maximum weight that can be allocated to this Category (max value of 100) id <CategoryAddDelegate> delegate; //A Course Planner TVC } Any help appreciated, thanks in advance!

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• HTML img scaling

  - by rwallace

  I'm trying to display some large images with HTML img tags. At the moment they go off the edge of the screen; how can I scale them to stay within the browser window? Or in the likely event that this is not possible, is it possible to at least say "display this image at 50% of its normal width and height"? The width and height attributes distort the image -- as far as I can tell, this is because they refer to whatever attributes the container may end up with, which will be unrelated to the image. I can't specify pixels because I have to deal with a large collection of images each with a different pixel size. Max-width doesn't work.

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• Finding number of different paths

  - by peiska

  I have a game that one player X wants to pass a ball to player Y, but he can be playing with more than one player and the others players can pass the ball to Y. I want to know how many different paths can the ball take from X to Y? for example if he is playing with 3 players there are 5 different paths, 4 players 16 paths, if he is playing with 20 players there are 330665665962404000 paths, and 40 players 55447192200369381342665835466328897344361743780 that the ball can take. the number max. of players that he can play with is 500. I was thinking in using Catalan Numbers? do you think is a correct approach to solve this? Can you give me some tips.

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• facebook login button not rendering

  - by Neha

  Hi I am developing a widget that will be placed on an external website. The entire plugin has to be written in javascript. I haev searched here and there but am unable to make the facebook login button appear on the widget My code is the following var fbroot = document.createElement('div'); fbroot.id = "fb-root"; window.fbAsyncInit = function(){ FB.init('xxxxxxxxxxxxxxxxxx', '/xd_receiver.htm'); }; var contentRightDiv = document.createElement('div'); contentRightDiv.id = "contentrightdiv"; contentRightDiv.innerHTML = "<form><p><label>Sign in using <div id='socialmedialoginbtns'></div></label></p></form>"; var socialmedialoginbtns = document.getElementById('socialmedialoginbtns'); socialmedialoginbtns.innerHTML = '<fb:login-button show-faces="false" width="200" max-rows="1"></fb:login-button>';

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• Monitoring Log Shipped Databases

  - by Registered User

  I need a consistent way to monitor databases that are read-only log shipped copies of production databases. In the past I have relied on the following methods: Set the job that restores logs to the database kick off another job as its last step. Set the job that restores logs to the database to insert a record in a control table as its last step. Query the msdb database to check the status of the job that restores logs to the database. Query a control table inside the database itself that gets a value immediately before transaction logs are backed up. Query MAX values from tables inside the database to see if it has recent changes. Although the above methods work, they can't be implemented for every log shipped database that I query for various reasons. What is the best method for monitoring the "data as of" date for a log shipped database?

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• How to set per-script upload_max_filesize limit?

  - by Ilya Muromets

  I have the following issue: How to set per-script upload_max_filesize limit? I want to set a larger upload max filesize limit for a particular script (action). I know I could use .htaccess, but the problem is that all actions are being dispatched via single index.php file, which likely means for all actions .htaccess rules are the same. So is it possible to set a per-script max_upload_size for a single php script (action)? Hope, you will be able to help me. Thanks in advance.

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