Oracle LogMiner

Oracle LogMiner, a utility provided by Oracle Corporation to purchasers of its Oracle database, provides methods of querying logged changes made to an Oracle database, principally through SQL commands referencing data in Oracle redo logs. A GUI interface for the functionality comes with the Oracle Enterprise Manager product.

LogMiner turns the concept and practices of data mining on the internal processes of the database itself.

Database administrators can use LogMiner to:

identify the time of a database-event
isolate transactions carried out in error by users
determine steps needed for the recovery of inadvertent changes to data
assemble data on actual usage for use in performance-tuning and capacity-planning
audit the operation of any commands run against the database

Note that LogMiner uses Oracle logs to reconstruct exactly how data changed, whereas the complementary utility Oracle Flashback addresses, reconstructs and presents the finished results of such changes, giving a view of the database at some point in time.