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Log-based Recovery. Log is a sequence of records, which maintains the records of actions performed by a transaction. It is important that the logs are written prior to the actual modification and stored on a stable storage media, which is failsafe. Log-based recovery works as follows − The log file is kept on a stable storage media. Download >>Download Log based recovery in dbms pdf Read Online >>Read Online Log based recovery in dbms pdf Chapter 17: Recovery System Failure Classification. A database management system stores data in such a way that it becomes easier to retrieve, manipulate, and produce information. Characteristics Traditionally, data was organized in file formats. DBMS was a new concept then, and all the research was done to make it overcome the deficiencies in traditional style of data management.

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View slides_381-419 from MATH 314 at Binghamton. Log-Based Recovery log stores all database update activities in the order they occur update log record is a tuple.

The failure may be the result of a system crash due to hardware or software errors, a media failure, such as a head crash, or a software error in the application, such as a logical error in the program that is accessing the database. It may also be the result of unintentional or intentional corruption or destruction of data. Whatever the underlying cause of the failure, the DBMS must be able to recover from the failure and restore the database to a consistent state. It is the responsibility of DBMS to ensure that the database is reliable and remains in a consistent state in the presence of failures.