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Data Guard Log Miner Tips

Oracle Database Tips by Donald Burleson


Understanding Log Miner for Data Guard

Log Miner is a redo log query engine that is provided with the Oracle database server. Log Miner was introduced in Oracle 8.1, and later releases of Oracle improved on the performance of the log miner utility. In Oracle 9i Release 2, the log miner engine is the core of the log apply service for the logical standby database.

Log Miner uses redo entries embedded in online redo log files or archived redo log files and data dictionary information to build the SQL statement. Log Miner keeps the contents of the redo log file in the fixed view, v$logmnr_contents. The SQL interface can be used to query this view in order to see the SQL statement executed on a database at any point in time.

Together, the column SQL_REDO and the SCN of v$logmnr_contents, can provide relevant information on the activity within the database. In addition, this view contains the segment name and owner which is useful in further identification of the objects being altered.

The above text is an excerpt from the book: Oracle Data Guard Handbook

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