I have faced a weird issue while querying one of our collections and aggregating the result out to another collection. I am querying unique users who have done some action and projecting the count ...

I have created a SQLite database successfully and it works fine. However when the onUpgrade method is called, I'd like to do so without losing data. The app I'm developing is a quiz app. Simply, wh...

I'm using a data service to send the user data to the app and display the username in my header component. If I sign in in my app with login component the username is correctly displayed, but when ...

I am using apache-cassandra-3.10 I understand instead of kill -9 pid, the only way to stop cassandra gracefully is nodetool stopdaemon. But I want to know if nodetool stopdaemon also flushes the ...

As the data in the Commitlog is flushed to the disk periodically after every 10 seconds by default (controlled by commitlog_sync_period_in_ms), so if all replicas crash within 10 seconds, will I lo...

I'm developing an Android app and have been publishing weekly update for the past 3 years. From time to time I have users telling me that the app lost all its content after a recent update. There's...

I am managing a project in Java that stores user data. Users can be online, or offline. When users are online, their data is loaded into the data object for easy accessibility, and offloaded when t...

I accidentaly ran a DELETE command against a table with a wrong WHERE clause. I am using SQL Server 2005. Is there a way that could help me recover the lost data?

Did some search online, found simple 'tutorials' to use named pipes. However when I do anything with background jobs I seem to lose a lot of data. [[Edit: found a much simpler solution, see reply ...

I have a file, let's say file.txt I have done git mv file.txt to file1.txt, then I created a new file called file.txt and worked on it. Unfortunately I didn't add that file to git yet. Anyway the p...

I've encountered this problem for a second time now, and I'm wondering if there is any solution to this. I'm running an application on Google App Engine that relies on frequent communication with a...

I am building an app that is fast moving into production and I am concerned about the possibility that due to hacking, some silly personal error (like running rake db:schema:load or rake db:rollbac...