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History files are internal database files that contain references to the undo log files of completed transactions. The history files specify which undo log file belongs to which completed transaction.

At each savepoint, the database system backs up all updated history files to the data area.

For performance reasons, there are always several history files open at the same time. The database system calculates the number of history files based on the general database parameter MaxUserTasks.

More Information

Concepts of the Database System, How Databases Log Data Changes

Database Administration, General Database Parameters

SAP Note 1247666 Information published on SAP site(FAQ: MaxDB/liveCache History Pages)