Question  If I set dbflashbackretentiontarget6. Happy Tree Friends Valentine Game more. Lets assume I set dbflashbackretentiontarget6. When I reach the time limit for dbrecoveryfiledestsize will. Also, Will the size of flashback recovery area. Answers  The dbflashbackretentiontarget parameter. Default value 1. Modifiable ALTER SYSTEMRange of values How far back one can flash back a database depends on. Oracle has kept in the recovery area. The following statement changes the flashback. SQL alter. system set dbflashbackretentiontarget 2. The following statement changes the flashback time from the default. SQL alter system set dbflashbackretentiontarget. How far back you can flash back also depends on how much flashback. Alter System Db Recovery File Dest Size' title='Alter System Db Recovery File Dest Size' />Oracle has kept in the flashback recovery area. If you. exceed the size of your flashback recovery area, the offending task will. Alter System Db Recovery File Dest Size' title='Alter System Db Recovery File Dest Size' />ORA 3. Limit of s flashback. If you. ever receive the out of space warning 8. Consider changing your backup retention and archive log retention. Increase the size of the DBRECOVERYFILEDESTSIZE parameter to. Use. the BACKUP RECOVERY AREA command in the RMAN to back up the contents. When your database hangs with a ORA00257 error while you notice there is plenty of space in the recoveryarea mountpoint youre likely to have reached the maximum. SQL shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SQL startup mount ORACLE instance started. Total System Global Area. Raiden X Rom. Dbrecoveryfiledest tips. Oracle Tips by Burleson Consulting March 24, 2014. The Flash Recovery Area FRA associated with the parameter DBRECOVERYFILEDEST is a unified storage location for all recovery related files and activities in. Alter System Db Recovery File Dest Size' title='Alter System Db Recovery File Dest Size' />Use. RMAN to delete unnecessary backup files. The RMAN commands. CROSSCHECK and DELETE EXPIRED come in handy during this deletion. You can. monitor the flash recovery area with the vrecoveryfiledest. See the. Oracle scripts collection. The flash. recovery area may contain the following files. Datafile copies The new RMAN command BACKUP AS COPY can be used. Control file autobackups The database places any control file. Archived redo log files If you store Archived redo log files in. Oracle will automatically delete the files. Online redo log files Oracle recommends that you save a. The following statements can create online redo logs in the. CREATE DATABASE, ALTER DATABASE ADD LOGFILE, ALTER DATABASE ADD. STANDBY LOGFILE, and ALTER DATABASE OPEN RESETLOGS. Current control files Oracle also recommends that you store a. Flashback logs If you enable the flashback database feature. Oracle copies images of each altered block in every datafile into. Note. Oracle calls the multiplexed redo log files and control files in the. Oracle terms all the other files in. Oracle will delete them eventually after they have become obsolete or. Related flashback errors for RAC include ORA 3. Cause The value of parameters. Performing RMAN Recovery Advanced Scenarios. Ensure that the backups of the target database are accessible on the new host. To test disaster recovery, you must have a recoverable backup of the target database. When preparing your disaster recovery strategy, ensure that the backups of the data files, control files, and server parameter file are restorable on hostb. Thus, you must configure the media management software so that hostb is a media manager client and can read the backup sets created on hosta. Consult the media management vendor for support on this issue. Configure the ORACLESID on hostb. This scenario assumes that you want to start the RMAN client on hostb and authenticate yourself through the operating system. However, you must be connected to hostb either locally or through a net service name. After logging in to hostb with administrator privileges, edit the etcgroup file so that you are included in the DBA group. Set the ORACLESID environment variable on hostb to the same value used on hosta. ORACLESID trgta. Start RMAN on hostb and connect to the target database without connecting to the recovery catalog. For example, enter the following command. NOCATALOG. RMAN CONNECT TARGET. Set the DBID and start the database instance without mounting the database. For example, run SETDBID to set the DBID, then run STARTUPNOMOUNT. SET DBID 1. 34. 07. STARTUP NOMOUNT. RMAN fails to find the server parameter file, which has not yet been restored, but starts the instance with a dummy file. Sample output follows. ORA 0. 10. 78 failure in processing system parameters. LRM 0. 01. 09 could not open parameter file nethostboracledbsinittrgta. Oracle instance without parameter files. Oracle instance started. Restore and edit the server parameter file. Because you enabled the control file autobackup feature when making your backups, the server parameter file is included in the backup. If you are restoring an autobackup that has a nondefault format, then use the SET CONTROLFILE AUTOBACKUP FORMAT command to indicate the format. Allocate a channel to the media manager, then restore the server parameter file as a client side parameter file and use the SET command to indicate the location of the autobackup in this example, the autobackup is in tmp. ALLOCATE CHANNEL c. DEVICE TYPE sbt PARMS. SET CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO tmpF. RESTORE SPFILE. TO PFILE oradatatestinittrgta. FROM AUTOBACKUP. SHUTDOWN ABORT. Edit the restored initialization parameter file. Change any location specific parameters, for example, those ending in DEST, to reflect the new directory structure. For example, edit the following parameters. LOGARCHIVEDEST1. CONTROLFILES. Restart the instance with the edited initialization parameter file. For example, enter the following command. STARTUP FORCE NOMOUNT PFILEoradatatestinittrgta. Restore the control file from an autobackup and then mount the database. For example, enter the following command. ALLOCATE CHANNEL c. DEVICE TYPE sbt PARMS. RESTORE CONTROLFILE FROM AUTOBACKUP. ALTER DATABASE MOUNT. RMAN restores the control file to whatever locations you specified in the CONTROLFILES initialization parameter. Catalog the data file copies that you copied in Restoring Disk Backups to a New Host, using their new file names or CATALOG STARTWITH if you know all the files are in directories with a common prefix easily addressed with a CATALOG START WITH command. For example, run. CATALOG START WITH oracleoradatatrgt. If you want to specify files individually, then you can execute a CATALOG command as follows. CATALOG DATAFILECOPY. Start a SQLPlus session on the new database and query the database file names recorded in the control file. Because the control file is from the trgta database, the recorded file names use the original hosta file names. You can query V views to obtain this information. Run the following query in SQLlus. COLUMN NAME FORMAT a. SPOOL LOG tmpdbfilenames. SELECT FILE AS FileGrp, NAME. FROM VDATAFILE. SELECT GROUP,MEMBER. FROM VLOGFILE. Write the RMAN restore and recovery script. The script must include the following steps For each data file on the destination host that is restored to a different path than it had on the source host, use a SETNEWNAME command to specify the new path on the destination host. If the file systems on the destination system are set up to have the same paths as the source host, then do not use SET NEWNAME for those files restored to the same path as on the source host. For each online redo log that is to be created at a different location than it had on the source host, use SQL ALTERDATABASERENAMEFILE commands to specify the path name on the destination host. If the file systems on the destination system are set up to have the same paths as the source host, then do not use ALTER DATABASE RENAME FILE for those files restored to the same path as on the source host. Perform a SET UNTIL operation to limit recovery to the end of the archived redo logs. The recovery stops with an error if no SET UNTIL command is specified. Restore and recover the database. Run the SWITCH DATAFILE ALL command so that the control file recognizes the new path names as the official new names of the data files. The following code shows the RMAN script recotest. ALLOCATE CHANNEL c. DEVICE TYPE sbt PARMS. SET NEWNAME FOR DATAFILE 1 TO oradatatestsystem. SET NEWNAME FOR DATAFILE 2 TO oradatatestundotbs. SET NEWNAME FOR DATAFILE 3 TO oradatatestcwmlite. SET NEWNAME FOR DATAFILE 4 TO oradatatestdrsys. SET NEWNAME FOR DATAFILE 5 TO oradatatestexample. SET NEWNAME FOR DATAFILE 6 TO oradatatestindx. SET NEWNAME FOR DATAFILE 7 TO oradatatesttools. SET NEWNAME FOR DATAFILE 8 TO oradatatestusers. ALTER DATABASE RENAME FILE dev. TO oradatatestredo. ALTER DATABASE RENAME FILE dev. TO oradatatestredo. Do a SET UNTIL to prevent recovery of the online logs. SET UNTIL SCN 1. 23. RESTORE DATABASE. SWITCH DATAFILE ALL. RECOVER DATABASE. Execute the script created in the previous step. For example, start RMAN to connect to the target database and run the command. TARGET NOCATALOG. RMAN recotest. Open the restored database with the RESETLOGS option. From the RMAN prompt, open the database with the RESETLOGS option. ALTER DATABASE OPEN RESETLOGS. Caution When you re open your database in the next step, do not connect to the recovery catalog. Otherwise, the new database incarnation created is registered automatically in the recovery catalog, and the file names of the production database are replaced by the new file names specified in the script. Optionally, delete the test database with all of its files. Note If you used an ASM disk group, then the DROP DATABASE command is the only way to safely remove the files of the test database. If you restored to non ASM storage then you can also use operating system commands to remove the database. Use the DROP DATABASE command to delete all files associated with the database automatically. The following example deletes the database files. STARTUP FORCE NOMOUNT PFILEoradatatestinittrgta. Because you did not perform the restore and recovery operation when connected to the recovery catalog, the recovery catalog contains no records for any of the restored files or the procedures performed during the test. Likewise, the control file of the trgta database is completely unaffected by the test.