Log - Logging

Data System Architecture


A log is a text file with:

  • a timed list of message (activities)
  • that an application has performed




The basic structure of a log entry is:

  • a timestamp
  • a text message
  • optional extra attributes

Server Application


  • they are point in time event registration, they fall in the category of time serie
  • they stores text message, the log platorms are specialized search engine.



The creation of log is done via a library.

Example of Java Logger Library


See What are the known formats for Log files?


When the log file are becoming too big, you need to:


Severity / Level

Generally, a level value is present in a log line that specifies the order of severity. See Logging - Level

Documentation / Reference

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