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  • Queue management in Rails

    - by Cyborgo
    Hi, I am planning to have something like this for a website that is on Ruby on Rails. User comes and enters a bunch of names in a text field, and a queue gets created from all the names. From there the website keeps asking more details for each one from the queue until the queue finishes. Is there any queue management gem available in Ruby or I have to just create an array and keep incrementing the index in session variable to emulate a queue behaviour?

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  • Why C/C++ have memory issue?

    - by LinuxNewbie
    I have read lots of programmers saying and writing when programming in C/C++ there are lots of issue related to memory. I am planning to learn to program in C/C++. I have beginner knowledge of C/C++ and I want to see some short sample why C/C++ can have issues with memory management. Please Provide some samples.

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  • Database related Questions

    - by alokpatil
    I am planning to make a railway reservation project... I am maintaining following tables.. trainTable (trainId,trainName,trainFrom,trainTo,trainDate,trainNoOfBoogies)...PK(trainId) Boogie (trainId,boogieId,boogieName,boogieNoOfseats)...CompositeKey(trainId,boogieId)... Seats (trainId,boogieId,seatId,seatStatus,seatType)...CompositeKey(trainId,boogieId,seatId)... user (userId,name...personal details) userBooking (userId,trainId,boogieId,seatId)...Is this good design reply me please...

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  • Implement a server that receives and processes client request(cassandra as backend), Python or C++?

    - by Mickey Shine
    I am planning to build an inverted index searching system with cassandra as its storage backend. But I need some guidances to build a highly efficient searching daemon server. I know a web server written in Python called tornado, my questions are: Is Python a good choice for developing such kind of app? Is Nginx(or Sphinx) a good example that I can look inside to learn its architecture to implement a highly efficient server? Anything else I should learn to do this? Thank you~

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  • How do I link ASP.NET membership/role users to tables in db?

    - by SnapConfig.com
    I am going to use forms authentication but I want to be able to link the asp.net users to some tables in the db for example If I have a class and students (as roles) I'll have a class students table. I'm planning to put in a Users table containing a simple int userid and ASP.NET username in there and put userid wherever I want to link the users. Does that sound good? any other options of modeling this? it does sound a bit convoluted?

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  • Can MySQL reasonably perform queries on billions of rows?

    - by haxney
    I am planning on storing scans from a mass spectrometer in a MySQL database and would like to know whether storing and analyzing this amount of data is remotely feasible. I know performance varies wildly depending on the environment, but I'm looking for the rough order of magnitude: will queries take 5 days or 5 milliseconds? Input format Each input file contains a single run of the spectrometer; each run is comprised of a set of scans, and each scan has an ordered array of datapoints. There is a bit of metadata, but the majority of the file is comprised of arrays 32- or 64-bit ints or floats. Host system |----------------+-------------------------------| | OS | Windows 2008 64-bit | | MySQL version | 5.5.24 (x86_64) | | CPU | 2x Xeon E5420 (8 cores total) | | RAM | 8GB | | SSD filesystem | 500 GiB | | HDD RAID | 12 TiB | |----------------+-------------------------------| There are some other services running on the server using negligible processor time. File statistics |------------------+--------------| | number of files | ~16,000 | | total size | 1.3 TiB | | min size | 0 bytes | | max size | 12 GiB | | mean | 800 MiB | | median | 500 MiB | | total datapoints | ~200 billion | |------------------+--------------| The total number of datapoints is a very rough estimate. Proposed schema I'm planning on doing things "right" (i.e. normalizing the data like crazy) and so would have a runs table, a spectra table with a foreign key to runs, and a datapoints table with a foreign key to spectra. The 200 Billion datapoint question I am going to be analyzing across multiple spectra and possibly even multiple runs, resulting in queries which could touch millions of rows. Assuming I index everything properly (which is a topic for another question) and am not trying to shuffle hundreds of MiB across the network, is it remotely plausible for MySQL to handle this? UPDATE: additional info The scan data will be coming from files in the XML-based mzML format. The meat of this format is in the <binaryDataArrayList> elements where the data is stored. Each scan produces = 2 <binaryDataArray> elements which, taken together, form a 2-dimensional (or more) array of the form [[123.456, 234.567, ...], ...]. These data are write-once, so update performance and transaction safety are not concerns. My naïve plan for a database schema is: runs table | column name | type | |-------------+-------------| | id | PRIMARY KEY | | start_time | TIMESTAMP | | name | VARCHAR | |-------------+-------------| spectra table | column name | type | |----------------+-------------| | id | PRIMARY KEY | | name | VARCHAR | | index | INT | | spectrum_type | INT | | representation | INT | | run_id | FOREIGN KEY | |----------------+-------------| datapoints table | column name | type | |-------------+-------------| | id | PRIMARY KEY | | spectrum_id | FOREIGN KEY | | mz | DOUBLE | | num_counts | DOUBLE | | index | INT | |-------------+-------------| Is this reasonable?

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  • Storing data locally and synchronizing it with data base on linux server

    - by Miraaj
    Hi all, I have developed a mac application, which is continuously interacting with database on linux server. As data is increasing it has become costlier affair in terms of time to fetch data from server. So I am planning to store required data locally, say on mysqlite and find some mechanism through which I can synchronize it with database on linux server. Can anyone suggest me some way to accomplish it? Thanks, Miraaj

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  • How to read expected child nodes of a given node from schema in PHP?

    - by MartyIX
    I was wondering if there's an implementation of a XML schema reader that for an arbitrary node in XML schema provides list of nodes which are supposed to be present as child nodes of given node, restrictions on nodes and so on. I'm planning to program it for my purposes but I would like to know if it isn't solved somewhere. I really need only a small subset what I described above. Thanks for tips!

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  • Size of a sharepoint web application

    - by Indra
    How do you figure out the current size of the sharepoint web application? Better yet, the size of a site collection or a subsite. I am planning to move a site collection from one farm to another. I need to plan the storage capacity first.

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  • taking a character input in python from a file?

    - by mekasperasky
    in python , suppose i have file data.txt . which has 6 lines of data . I want to calculate the no of lines which i am planning to do by going through each character and finding out the number of '\n' in the file . How to take one character input from the file ? Readline taken the whole line .

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  • Mastering Joomla

    - by Jineesh
    Hi I am planning to develop a portal using Joomla cms. The portal has to be fully customized. I would like to know some best tutorials and books for Joomla CMS customization. Thanks

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  • Best practices for QA / testing in an Agile (Scrum+XP) team?

    - by Srirangan
    Hey guys, We're getting a QA for the first time in our project. We're not sure how to best use him. We work in an Agile environment. Pair programming, user stories, short sprints (two weeks), daily stand-ups, retrospectives, planning meetings, quick releases etc. One obviously way to use a tester is to verify bugs fixes and user stories every sprint. Are there any better ways for an Agile team to utilize a tester. Thanks, Sri

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  • Suggestions/pointers for Post/Get to an .ASP (or .ASPX) page from a desktop app

    - by Clay Nichols
    I'm planning to have a desktop app interact with some .ASP or .ASPX pages on a server. I've only done a little bit with .asp pages and I'm thinking I'd just Post or Get a URL with some variables: MySite.com/Functions.asp?FunctionName=?Paramater1=somevalue?Parameter2=... I'm wondering if there is any better way to go about this? Am I missing something? Is there perhaps a better way to go about this?

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  • Push alerts to notification tray app in Java

    - by Rich Anderson
    Hi - how do I push server alerts to tray apps in java without using xmpp or other heavy protocols? Do you recommend a way to accomplish this? I was planning to write an app which uses URLConnection on a server equipped with Comet but I doubt if that would work as the client requires a JS to be invoked and URLConnection is not a browser.. What is the best way to push instead of using a proprietary client-server approach?

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  • Screen lock customization for android

    - by deaviator
    Hi frens I'm planning to explore the possibilities on how to make a screen lock better (like pattern based). It will be great help if someone points out the difficulty level or where to actually start digging. This is going to be my project idea for minor research paper. What do u guys think or if anyone has more ideas worth exploring, I would like to consider it. reagrds

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  • How to use one script for diff and diff3 in Subversion?

    - by lamcro
    I have a perl script that determines what external diff to use depending on the file's content. I would like to use it determine external diff3 also. Which is the best method to know how my script is being called? I was planning to catch the last three parameters, and verify if they are all files, to use the diff3 options, but I'm hoping there is a cleaner method.

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  • upload a image and insert directly into CKEditor

    - by Timmeh
    I'd like to create the same kind of function tumblr has for uploading images and then inserting them directly into the WYSIWYG editor. I was planning on using uploadify to upload the image, then I am not sure of the method for inserting into the CKEditor. Has anyone done anything similar or know of a plugin that could do this? Ideally I'd like it to insert the image wherever the text cursor was last placed. Thanks in advance, Tim

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  • Javascript wrappers for Twitter

    - by Ravi Vyas
    I am planning to build a JS based twitter client. Information about libraries/clients is pretty old on other SO Questions. I was wondering if anyone has come across wrappers other than Spaz and TwitterHelper. Thanks :-)

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