Data rescue 4.2
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Use the PLUGGABLE DATABASE clause followed by the list of PDBs on which you want to perform the operation. To perform backup and complete recovery operations on multiple PDBs using a single command, you must connect to the root. The following command backs up the PDB hrpdb when connected to the root: In this case, use the PLUGGABLE DATABASE clause in your RMAN commands. For example, to back up a PDB, use the BACKUP DATABASE command. In this case, use the same commands that you would use to backup or recover non-CDBs. To perform backup and complete recovery operations on a single PDB, you can connect as TARGET to either of the following containers: Oracle Database Backup and Recovery User’s Guide discusses the flashback features of Oracle Database at greater length.Īlthough the Oracle Recovery Manager (RMAN) commands are the same, the syntax used to perform operations on multiple PDBs contains some modifications. You can use all of the features while your database is available. None of the preceding features requires advance preparation such as creating logical exports to allow for retrieval of your lost data, but Oracle Flashback Database requires the advance preparation of enabling the feature.
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The first two features operate at the logical level, whereas the last feature operates at the physical level. Oracle Flashback Database, which enables you to revert the entire database to a past point in time Oracle Flashback Drop, which enables you to retrieve deleted (dropped) database tables Oracle Flashback Table, which enables you to revert a table to its contents at a time in the recent past
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This section provides links to the following flashback features that are documented in Oracle Database Backup and Recovery User’s Guide: The flashback features enable you to reverse the effects of unwanted database changes without restoring data files from backup. The Oracle Database flashback features provide a range of physical and logical data recovery tools as efficient, easy-to-use alternatives to physical and logical backups. An effective backup strategy must be based on physical backups. Logical backups, such as exporting database objects such as tables or tablespaces, are a useful supplement to physical backups, but cannot protect your whole database. RMAN can also be used to perform point-in-time recovery to recover from logical failures when other techniques such as flashback cannot be used. The backup mechanisms work at the physical level to protect against file damage, such as the accidental deletion of a data file or the failure of a disk drive. RMAN optimizes performance and space consumption during backup with file multiplexing and backup set compression, and integrates with leading tape and storage media products. RMAN is designed to work intimately with the server, providing block-level corruption detection during backup and restore. With these files you can reconstruct your database. The files protected by the backup and recovery facilities built into RMAN include data files, control files, server parameter files, and archived redo log files. Oracle Recovery Manager (RMAN), a command-line tool, is the method preferred by Oracle for efficiently backing up and recovering your Oracle database. The focus in Oracle Database backup and recovery is on the physical backup of database files, which permits you to reconstruct your database.