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  • database vs flat file, which is a faster structure for regex matching with many simultaneous request

    - by Jamex
    Hi, which structure returns faster result and/or less taxing on the host server, flat file or database (mysql)? Assume many users (100 users) are simultaneously query the file/db. Searches involve pattern matching using regex against a static file/db. File has 50,000 unique lines (same data type). There could be many matches. There is no writing to the file/db, just read. Is it possible to have a duplicate the file/db and write a logic switch to use the backup file/db if the main file is in use? Which language is best for the type of structure? Perl for flat and PHP for db? TIA

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  • Writing shorter code/algorithms, is more efficient (performance)?

    - by Carlos
    After coming across the code golf trivia around the site it is obvious people try to find ways to write code and algorithms as short as the possibly can in terms of characters, lines and total size, even if that means writing something like: n=input() while n>1:n=(n/2,n*3+1)[n%2];print n So as a beginner I start to wonder whether size actually matters :D. It is obviously a very subjective question highly dependent on the actual code being used, but what is the rule of thumb in the real world. In the case that size wont matter, how come then we don't focus more on performance rather than size?

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  • How to get REALLY fast python over a simple loop

    - by totallymike
    I'm working on a spoj problem, INTEST. The goal is to specify the number of test cases (n) and a divisor (k), then feed your program n numbers. The program will accept each number on a newline of stdin and after receiving the nth number, will tell you how many were divisible by k. The only challenge in this problem is getting your code to be FAST because it k can be anything up to 10^7 and the test cases can be as high as 10^9. I'm trying to write it in python and having trouble speeding it up. Any ideas? import sys first_in = raw_input() thing = first_in.split() n = int(thing[0]) k = int(thing[1]) total = 0 i = 0 for line in sys.stdin: t = int(line) if t % k == 0: total += 1 print total

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  • Why am i getting "error:1409F07F:SSL routines:SSL3_WRITE_PENDING: bad write retry" error while attem

    - by Amit Ben Shahar
    I came across this error, and had to look in a lot of placed until i was able to find the reason for this error and thought this might save someone else the hassle. the reason is pretty simple: when SSL_Write returns with SSL_ERROR_WANT_WRITE or SSL_ERROR_WANT_READ, you have to repeat the call to SSL_write with the same parameters again, after the condition is satisfied. Calling it with different parameters, will yield the 1409F07F bar write retry error. Hope this saved someone's important time :P Amit.

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  • winapi c - read/write mbr of system drive

    - by kiasecto
    Does anyone have any example code that shows how to identify the system boot harddisk, and read/write the mbr from the harddisk in windows xp and vista? I know createfile can be used. But I do not know how to properly identify which device is the boot device. Like how do you find out which ones you are meant to use? \.\Volume{GUID}\ or \?\Device\HarddiskVolumeX etc?

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  • Error: NAND: could not write file /hd2/android-sdk-linux_86/add-ons/google_apis-7_r01/images//system

    - by H.B.Dave
    I am new comer to Android development. Installed fresh Eclipse (Ganymede), Android android-sdk-linux_86. Tried HelloWorld program. Compiles OK. An AVD "my1" created for API level 7. The Emulator does not start, giving an error: [2010-03-11 16:49:49 - Emulator] NAND: could not write file /hd2/android-sdk-linux_86/add-ons/google_apis-7_r01/images//system.img, File exists Perplexed. Help requested.

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  • Android - Attempt to write in a readonly database when I open it readonly

    - by DLock
    i don't understand this at all. I try to open a db located in my SD card this way: db = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS | SQLiteDatabase.OPEN_READONLY); But in that very line it throws this exception: android.database.sqlite.SQLiteException: attempt to write a readonly database It doesen't happen in my other devices, just this one that has android 2.3.3

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  • Handling Solr read and write timeout exception

    - by Azhar
    Hello, I am new to solr. I have developed a an website which uses solr for indexing. I want to handle the timeouts that can occur during solr read and write index.Please guide me on how can i handle these exceptions. I am using solrj as solr client and my website and solr server are running on the tomcat. Thnak you!

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  • Looking to write a Tag class

    - by Austin Schneider
    I'm looking to write a Tag class (a tag is a string with no spaces). My first thought is to inherit from String: class Tag < String def initialize(str) raise ArgumentError if str =~ /\s/ super end end Does this look correct? Are there any other methods I should redefine?

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