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This command accesses the RMAN repository to query the backup metadata, but does not actually read the backup files to ensure that they can be restored.Īs an alternative to RESTORE. PREVIEW to any RESTORE operation to create a detailed list of every backup to be used in the requested RESTORE operation, and the necessary target SCN for recovery after the RESTORE operation is complete. This technique is described in " Performing Recovery with a Backup Control File". If you restore the control file from backup, then you must perform media recovery of the whole database and then open it with the OPEN RESETLOGS option, even if no data files must be restored. After the CONTROL_FILES parameter references only present, intact copies of the control file, you can restart your database.
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#DUPLICACY 1.1 VSS UPDATE#
If at least one control file remains intact, then you can either copy an intact copy of the control file over the damaged or missing control file, or update the initialization parameter file so that it does not refer to the damaged or missing control file. Loss of some but not all copies of your control file does not require you to restore a control file from backup. If you try to start the database without a valid control file at each location specified in the CONTROL_FILES initialization parameter, then the database reports an error. The database shuts down immediately when any of the multiplexed control files become inaccessible. You are using the RMAN client rather than Oracle Enterprise Manager. Your database runs in a single-instance configuration.Īlthough RMAN can restore and recover databases in Oracle RAC and Data Guard configurations, these scenarios are beyond the scope of this manual. If you perform media recovery on an encrypted tablespace, then the Oracle keystore must be open when performing media recovery of this tablespace. You are not restoring and recovering an encrypted tablespace. If the data file was created in a parent incarnation, then it is created during the restore or recovery phase as appropriate. During recovery, the database detects the missing data file and reports it to RMAN, which creates a data file and continues recovery by applying the remaining logs. The control file does not have the data file record, that is, you did not back up the control file after data file creation. The RECOVER command can then apply the necessary logs to the data file. If the data file record is in the control file, then RESTORE creates the data file in the original location or in a user-specified location. The control file knows about the data file, that is, you backed up the control file after data file creation, but the data file itself is not backed up. When a data file is lost, the possible cases can be classified as follows: RMAN can handle lost data files without user intervention during restore and recovery. Every data file either has a backup, or a complete set of online and archived redo logs goes back to the creation of a data file with no backup. You have the complete set of archived redo logs and incremental backups needed for recovery of your data file backups.
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Your database is using the current server parameter file. You have lost some or all data files and your goal is to recover all changes, but you have not lost all current control files or an entire online redo log group. This chapter makes the following assumptions: The complete recovery operations described in this chapter are subject to certain conditions.