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• What data is actually stored in a B-tree database in CouchDB?

  - by Andrey Vlasovskikh

  I'm wondering what is actually stored in a CouchDB database B-tree? The CouchDB: The Definitive Guide tells that a database B-tree is used for append-only operations and that a database is stored in a single B-tree (besides per-view B-trees). So I guess the data items that are appended to the database file are revisions of documents, not the whole documents: +---------|### ... | | +------|###|------+ ... ---+ | | | | +------+ +------+ +------+ +------+ | doc1 | | doc2 | | doc1 | ... | doc1 | | rev1 | | rev1 | | rev2 | | rev7 | +------+ +------+ +------+ +------+ Is it true? If it is true, then how the current revision of a document is determined based on such a B-tree? Doesn't it mean, that CouchDB needs a separate "view" database for indexing current revisions of documents to preserve O(log n) access? Wouldn't it lead to race conditions while building such an index? (as far as I know, CouchDB uses no write locks).

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• Framework/Algorithms/Library for server side estimation/recognition of audio file similarity?

  - by onlythoughtworks

  I want to implement an android app which compares recorded audio files with our sound database and reports a similiarity metric. The app will work somehow like Shazam but is matched against our database audio files. Can anyone point me to an open source project which implements adequate algorithms to do the sound recogognition/comparision on our server ? Thanks

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• Deactivate Air app created in AS3 after next monday?

  - by Carlos Barbosa

  Hi, i have an application deployed in Air, written in AS3 that client wants to install and test, i have developed a simple license app, but he is pushing for a full license witch he said he will fully paid on next monday. How would you create a procedure in AS3 to deactivate application next monday? How secure will it be? will simply changing machine date will bypass this?

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• Recommendations for TimeSeries db

  - by Kumar

  preferably open source for storing tick info.

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• javascript unixtime one minute in front

  - by cocacola09

  Hi I'm passing a unixtimestamp to a javascript IF statement, can anyone tell me how to generate a unixtimestamp one minute in the future with javascript. Anyhelp would be helpful. Thanks

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• Console.SetWindowPosition -> centered (each and every time)

  - by manny

  I'm trying to set the Console window executed via my C-sharp code to be centered each and every time code is generated. I hope that makes sense. I thank you guys in advance.

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• Track page time spent with cookie

  - by Ashok

  I have an asp.net web app that has Session state stored in sql server. I need to keep track of the time spent by a user on each page. How can i do that using cookies?

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• openmp program elapsed time not scaling with increased threads

  - by Griff

  I've got this openmp fortran program doing an embarrassingly parallel problem - do loop over 512^3 elements. See output below. Why would there be such strange behavior in the elapsed time as a function of threads? I thought it would peak at a sweet spot then slowly degrade. This clearly isn't happening. Perhaps I misunderstand something about openmp. Threads, omp_get_wtime 1, 103.76298500015400 2, 65.346454000100493 4, 45.923643999965861 7, 38.074195000110194 8, 36.968765000114217 9, 39.45981499995105 10,40.753379000118002 12,39.577559999888763 14,37.909950000001118

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• NTPD: use an unrestricted port for communication

  - by Cetra

  When querying ntp servers with the command ntpdate, I can use the -u argument to make the source port an unrestricted port (port 1024 and above). With ntpd, which is meant to run in the background, I can't seem to find a way to turn this option on. So the source port is always 123. It's playing around horribly with my firewall configuration. Is there a configuration option in ntp.conf to make it use a random source port?

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• failure on creating a Scikits.TimeSeries object

  - by user311906

  Hi All I am trying to create a scikit.timeseries object starting from 2 datetime objects. If I understood correctly it should be possible to create a scikits.timeseries starting from datetime objects. I try the following code but it says that Insufficient parameters. The 2 datetime differs for few microseconds. In this case what should be the value for freq parameter? Is what I am trying allowed? In theory, since timeseries can be based on datetime objects it should be possible to hanlde up to microsecond , is this correct? I think that this is not really clear to me. Regards Eo import datetime import sckilits.timeseries as ts tm1 = datetime.datetime( 2010,1,1, 10,10,2, 123456 ) tm2 = datetime.datetime( 2010,1,1, 10,10,2, 345678 ) d = [ tm1, tm2 ] tseries = ts.time_series( dates=d ) tseries = ts.time_series( d )

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• Biggest performance improvement you've had with the smallest change?

  - by JoelFan

  What's the biggest performance improvement you've had with the smallest change? For example, I once improved the performance of a certain page on a high-profile web app by a factor of 10, just by moving "where customerID = ?" to a different place inside a complicated SQL statement (before my change it had been selecting all customers in a join, then later selecting out the desired customer).

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• Formatting time in milliseconds using boost::date_time library

  - by Ylisar

  I have a time duration in milliseconds which I ideally would like to format using the formatting functionality present in the boost::date_time library. However, after creating a boost::posix_time::time_duration I can't seem to find a way to actually apply the formatting string to it.

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• openssl_public_encrypt encrypted data is every time different

  - by panny

  why is the content of $encrpyted every time different? // aquire public key from server $server_public_key = openssl_pkey_get_public(file_get_contents("C:\publickey.pem")); // rsa encrypt openssl_public_encrypt("123", $encrypted, $server_public_key);

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• Idea of developing "Calendar" from scratch

  - by Ahmed Khalaf

  What's the broad math idea behind the calendar if you need to build one from scratch without depending on OS or other libraries ?

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• How to redirect to index page if session time out happend in jsf application

  - by Paul

  Hi I am using JSF RI 1.1. How to redirect to index page if session time out happens. pls give some code snippets.

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• How does quartz track the time

  - by Nrj

  How does quartz track the time ? Is it a continuous timer running in background or does it somehow uses the OS scheduler or is it something else ? Which class actually holds this feature ? Thanks.

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• compare time using date command

  - by Andrei

  Say I want a certain block of bash script execute only if it is between 8 am (8:00) and 5 pm (17:00), and do nothing otherwise. The script is running continuously So far I am using date command. How to use it compare it current time within the range? Thanks

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• I wanna semi-transparent video at Video play time

  - by frankqianghe

  I use windows media player control in C# ,I wanna semi-transparent video at Video play time ,I set Opacity to 0.5 in form , can semi-transparent at windows 7 but no translucent at windows Xp,Pls tell me The illustrates how it is done at WIN XP? I use development environment is visual studio 2008, .Net framework 2.0

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• mass add time in a file

  - by atinder

  i have a file in which time appears nearly hundred times like 00:01:32 00:01:33 00:01:36 ....................... how can i add 2 seconds or 2 minutes to all the times in the file so that i get 00:01:34 00:01:35 00:01:38 ..................

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• Real-time spectrum analyzer with API

  - by bobobobo

  I'm looking for a C or C++ API that will give me real-time spectrum analysis of a waveform on Windows. I'm not entirely sure how large a sample window it should need to determine frequency content, but the smaller the better. For example, if it can work with a 0.5 second long sample and determine frequency content to the Hz, that would be wicked-awesome.

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• Creating a new log file every time my program is run

  - by Bernhard V

  Hi, I am using the Apache commons logging library and log4j to generate my log files. Now I want to create a new file every time I run my program. The current count should be appended to the log file's name. For example: program_1.log program_2.log program_3.log Do you know how I could achieve this?

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• ListView In ControlTemplate how i make to scroll to my real time updated Collection last item

  - by euvid

  Please answear me how can i access the ListView in controlTemplate, or what event handler to use for extracting sender parameter that will be called every time my Collection is updated. Please give a solution! I make brainstorming for a week already!!

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• Annotations present at compile time but absent at runtime

  - by deamon

  It is possible to use Java class files which includes annotations that are not present at runtime? Example: I want to write a class with the JPA @Embeddable annotation, which would be present at compile time (maven scope: "provided"). But the annoatation definition could be absent at runtime, if the class is used outside a JPA application.

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• Why did my ASP.NET Web App stop showing AM in times?

  - by qntmfred

  I haven't made any code or configuration changes (that I know of) to my ASP.NET web application and this morning it suddenly stopped showing the AM in my displayed times. PM still shows up, just not AM. It's hosted on Windows Server 2003. I figured somehow the OS regional settings might have been changed somehow, but that doesn't appear to be the case. How could this have happened?

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• C#: can you add to an enum type in run-time

  - by Craig Johnston

  If I have the enum type: Public enum Sport { Tennis = 0; Football = 1; Squash = 2; Volleyball = 3; } Can I somehow add during run-time: PingPong = 4

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