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Oracle redo logs backup after switching to new redo log group is one way to ensure integrity of database data. In this case redo logs backup is invoked automatically if used space for redo log file filesystem became, say, over 50%. If used space is over 80% then a severe message is generated to the monitoring system (for example to HP Operations Manager ) to alert operators about the situation. We will discuss this topic using Perl as an implementation language.
The typical implementation uses file lock that is created when archiving starts and removed when backup is over. Here are the states that arching script can encounter:
|Init no lock||W (warn, lock)||C Critical, lock)||Stale1||Stale2|
|Stale 1 (stale 50 min)||n/a||S1||S1||n/a||n/a|
|Stale 2 (stale, 50*n min)||n/a||S2||S2||S2||S2|
Backup Strategies in ARCHIVELOG Mode
If a database is operating in ARCHIVELOG mode, filled groups of online redo log files are being archived.
Therefore, the archived redo log coupled with the online redo log and datafile backups can protect the database from a disk failure, providing for complete recovery from a disk failure to the instant that the failure occurred (or, to the desired past point-in-time).
Following are common backup strategies for a database operating in ARCHIVELOG mode:
- When the database is initially created, perform a whole database, closed backup of the entire database. This initial whole database backup is the foundation of backups because it provides backups of all datafiles and the control file of the associated database.
- Subsequent whole database backups are not required, and if a database must remain open at all times, whole database, closed backups are not feasible. Instead, the DBA can take open database or tablespace backups to keep database backups up-to-date.
- Every time a structural change is made to the database, take a control file backup. If operating in ARCHIVELOG mode and the database is open, use either Recovery Manager or the ALTER DATABASE command with the BACKUP CONTROLFILE option.
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