10.4. Summary
In this chapter, we presented the database structures that are key elements that need to be multiplexed and backed up to ensure a smooth recovery in the event of a database failure: the control files, online redo log files, and archived redo log files. The control files contain the metadata about every other structure in the database. The online redo log files provide performance benefits to ongoing transactions and ensure that no committed transactions are lost after an instance failure; being able to change the number of redo log groups and the number of members in each group enhances both the availability and performance of the database. Archived redo log files make copies of online redo log files to one or more destinations ...
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