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It's a data structure that stores records in a linear sequence, always adding new. However, expressing mutable objects in. Databases use this technique to record every operation sequentially

If the system crashes, it can simply replay these logs to restore the last known state You are getting only logs from file1 (and sometimes few lines from file2 at the end of the logfile) because whenever file2 writes something to the log it (roughly) first seeks to the end of the file and then writes the data (filemode='a') but when file1 writes to the file it only writes the data and its position in the file is not updated and it overwrites any lines from file2 (filemode='w. This approach ensures durability while keeping the system efficient.

Every change (transaction) that happens to the data is logged by the program, and on retrieval the program must combine the pieces of data found in this log file

In this post, i'll walk you through everything you need to know about logs, including what is log and how to use logs for data integration, real time processing, and system building A log is perhaps the simplest possible storage abstraction

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