what is a log file in dbms

The point at which the log writer LGWR stops writing to the active redo log file and switches to the next available redo log file. When it reaches to the checkpoint then the transaction will be updated into the database and till that point the entire log file will be removed from the file.

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LGWR switches when either the active redo log file is filled with redo records or a switch is manually initiated.

. The checkpoint is used to declare a point before which the DBMS was in the consistent. Then the log file is updated with the new step of transaction till next checkpoint and so on.

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