backup
芮祺
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 before they are overwritten by new transactions. The common thread through all three of these structures is multiplexing: creating redundant copies of database components or redundant archival locations to minimize the impact of a media failure.
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 before they are overwritten by new transactions. The common thread through all three of these structures is multiplexing: creating redundant copies of database components or redundant archival locations to minimize the impact of a media failure.
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