R
- rate option
An option designed to limit Recovery Manager (RMAN) from using excessive system resources during backup and restore operations.
- RBAL
In an ASM instance, this background process coordinates the disk activity for disk groups.
- read-only tablespace
A tablespace that contains static information and is not updated.
- recovery catalog
Recovery information that is stored inside an Oracle database that is different from the database being backed up. This is similar to the RMAN repository residing in the target database's control file, but the metadata about backups and restores of one or many target databases is stored in an Oracle database.
- RECOVER DATABASE
A user-managed and Recovery Manager (RMAN) command that initiates the recovery process by applying archived redo logs to the appropriate database files in the recovery process.
- Recovery Manager (RMAN)
The recommended backup and recovery tool provided with the Oracle Database Server software.
- Recycle Bin
A logical storage container for all dropped tables and their dependent objects. See also Flashback Drop; SHOW RECYCLEBIN; space pressure.
- redo entry
A group of change vectors. Redo entries record data that you can use to reconstruct all changes made to the database, including the undo segments. Also known as a redo record.
- redo log file
One of the files that comprises a redo log group. A database needs at least two redo log groups. Also known as a redo log member.
- redo log file groups
See log file groups.
- redo log members
See redo log file.
- Redo Logfile Size Advisor
An advisor within the Oracle advisory framework that analyzes redo log file usage and recommends an optimal redo log file size to minimize I/O and log file switches.
- redo record
See redo entry.
- report command
A Recovery Manager (RMAN) command used to query the RMAN repository and get the data regarding which files need a backup, unneeded backups, database physical schema, and whether or not unrecoverable operations were performed on files.
- RESETLOGS
A method of opening the database after incomplete recovery that resets the redo log sequence. This has been modified in Oracle Database 10g to allow recovery from a prior backup through the incomplete recovery opening the database with RESETLOGS.
- resource allocation methods
A group of Oracle-defined methods of resource allocation that can be utilized in plan directives.
- resource consumer groups
A method of grouping user sessions, usually based on their resource consumption needs.
- resource plan
A DRM object that contains directives to allocate resources to consumer groups and sub-plans.
- resource plan directive
A rule for the allocation of resources to a consumer group or to a sub-plan from a resource plan.
- retention period
The amount of time that database performance snapshots will be retained in the AWR. By default, the retention period is set to 10,080 minutes (7 days). See also Automatic Workload Repository.
- retention policy
The determined length of time that a database file backup is retained for use in a potential restore operation.
- RMAN backup
A physical backup method using the Recovery Manager (RMAN) utility to perform the backup to tape or disk.
- RMAN repository
The information that Recovery Manager (RMAN) needs to function to perform backup and recovery operations. This information is stored in the database's control file or in the optional recovery catalog.
- RVWR
The database background process that writes to the flashback database logs and performs the flashback database recovery.