database data file log file

The log file is used to record the operation information of your database, for example, the problems caused by the operation of the database are recorded in the log file. If there is a problem with the database, you can look at the log file to analyze the cause of the error. Just like someone has the habit of writing a diary, he will record everything he does every day. The diary is equivalent to the diary file here, and what people do every day is equivalent to the operation of the database. At some point, people forget When he has done something before (or has done something that has an impact on the present), he goes to the diary database he wrote and the same is true