python - Update Two Related Files On Disk In a "Secure" Way? -

python - Update Two Related Files On Disk In a "Secure" Way? -

I have two binary files that are related to one another (i.e., when a file's update is updated The second file is recorded to match the match should also be updated). Both files are binary files stored on disk.

UpdateFirstFile () - The first file has been updated ... ..

The update will appear something like this:

UpdateFirstFile () - The first file has been updated ... ..

UpdateSecondFile () - The second file has been updated ...

What methods should I use to ensure that both files are updated or from files Have not got any updates?

Both files are flat files (size 20 [MB] each). I know that a database would have solved this problem, however I'm using one due to overhead reasons (more than 20 [MB] in each table needs to be stored, and I'm less on space And 1000s of such files .. ..).

Any thoughts?

  Any kind of rollback journal should be implemented with the general viewpoint.  
 For example, you can use a different file to record the current content of each part in each file, which will be affected by the update. After your transaction is complete, you remove the journal file.  
 The presence of journal files upon the transaction will mean that another transaction is either pending or interrupted. In that situation, you use the contents of the journal to reverse any file changes that went before the interruption.  
 In this way, you will leave any other part of the update operation that you need as a practice for the reader.  
 Keep in mind that this is correct  the right path  is harder than it seems, especially if you have multiple processes updating the same file.








03:22

















Get link





Facebook





X





Pinterest





Email





Other Apps




Comments





Post a Comment







Popular Posts









r - Plot correlation matrix into a graph -



    I have a matrix with some correlation values. I now want to plot in that graphic which is more like this or Looks less:         Library (Latis) # Horizontal and vertical axis information please take- c (div class = "post-text" itemprop = "text">  "214", "215", "216", "224", "211", "212", "213", "223", "226", "225") & lt; - Paste ("DM1- ", Hor, sep =" ") # counterfeit co Relation matrix narokol & lt; (I 1: nrowcol) for core [i] - length (var) core & lt; - matrix (runif (nrowcol * nrowcol, min = 0.4), nrow = nrowcol, ncol = nrowcol (Color, "blue", "yellow"), space = "RGB"), levelplates (core, main = "dimnames = list (hor, ver)), I] = 1 # plot rgb. Stage 12-14 array correlation matrix ") Xlab =" ", ylab =" ", col.regions = rgb.palette (120), cut = 100, at = seq (0,1,0.01)) ...






asp.net - RegisterUser: CreateUserWizardStep -



    When using CreateUserWizardStep to register a new user I'm having a problem.   Help me solve this problem.I have tried to configure in the web. Provider tag for configuration    & lt; Required question and answer = "wrong" & gt;    Although it still does not work ... I'm using the MySQL database    RegisterUser :. An IEditableTextControl is not included with the CreateUserWizardStep.ContentTemplate ID question for the security question, it is necessary that your membership provider needs a question and answer.   Source error:   An unrestricted exception occurred during the execution of existing web requests. Information about the origin and location of the exception can be identified using the exception stack trace below.   Stack trace:.   [HttpException (0x80004005): RegisterUser: CreateUserWizardStep.ContentTemplate does not include questions IEditableTextControl security question with the ID, it is necessary to require a question and answer your subscri...






Integrate flash games in android app? -



    3 is a flash game that I want to integrate into a menu / list in the Android app. So when the user selects the game from the list, the game starts with the help of the Android Flash Player.   Is it better or better with webwave?   Is there any good tutorial?   Thank you! Adobe Flash provides a good way: you can create a breeze for the Android app.    Use this to create your menu and compile three games in your air app.   Here are some tutorial links about how to publish AiI for Android applications and:   PART1: AIR for Android, PART2:   Publication for Android apps: Ai:   I do not believe that the Android Flash Player can be launched with a single intention so far, so using Java Android will not solve it (now ) And   and a third approach Whatever you mentioned, it should work - using the webwave.








Powered by Blogger