ORACLE RMAN DATABASE DUPLICATION PDF
The focus of this book is database duplication using RMAN. main purpose is the backup and recovery of Oracle databases, there are other features that. Oracle 11g has introduced active database duplication, we can create a duplicate of the .. LOSS OF FULL DATABASE & RECOVERY - RMAN BACKUP. pdf. Oracle RMAN Database Duplication – PDF Books. Oracle Oracle Database Workspace Manager Developers Guide · Oracle Database JDBC Developers.
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Protected Databases. Cloud @ Customer. File syste m. RMAN: Built-in backup & recovery engine for the Oracle database which provides performant, efficient. PDF · Mobi · ePub In active database duplication, RMAN connects as TARGET to the source database instance and as RMAN connects to the auxiliary instance of the duplicate database on the destination host. The DUPLICATE entry in Oracle Database Backup and Recovery Reference for a complete list of which. Database Cloning Procedure using Oracle RMAN and the Sun ZFS Storage. Appliance. . appliance are then used to duplicate or clone the Oracle RMAN backup. The cloning procedure explained in pdf. The solution described in.
If duplication is made with a connection to the target or the recovery catalog, then the backup files on the destination host must have the same file specification as they had on the source host. Otherwise, this is not a requirement.
Is a recovery catalog available? This technique is advantageous where network connections from the auxiliary host to the source database are restricted or prone to intermittent disruptions.
How much disk space is available on the destination host? The disk space on the destination host can be an issue when you perform duplication using disk backups. For example, if the source database is 1 terabyte TB , and if you duplicate the database from disk backups without using shared disk or network file system NFS , then you must have at least 2 terabytes TB of space available on the destination host.
In some environments, manual transfer of backups is necessary because NFS performance is a bottleneck. Performance of active database duplication is probably slower on a wide area network WAN than a local area network LAN. If the performance degradation on a WAN is unacceptable, then backup-based duplication may be the only viable option.
When do you plan to duplicate the database? If you must duplicate the database during a period of high user activity, then the loss of network throughput caused by active duplication may be a problem, making backup-based duplication a better choice. Also, in active database duplication the RMAN channels required for copying files to the auxiliary host can affect performance.
Step 2: Choosing a Strategy for Naming Duplicate Files When duplicating a database, RMAN generates names for the duplicate control files, data files, temp files, and online redo log files. Therefore, you must decide on a naming strategy for these files. Oracle recommends the simplest duplication strategy, which is to configure the duplicate database to use the same names as the source database.
Duplicate a Database Using RMAN in Oracle Database 11g Release 2
Using the same names means that your environment meets the following requirements: If the source database uses ASM disk groups, then the duplicate database must use ASM disk groups with the same names. Although the directories are the same on the source and destination hosts, Oracle Database chooses the relative names for the duplicate files.
If the names of the database files in the source database contain a path, then this path name must be the same in the duplicate database. When you configure your environment as suggested, no additional configuration is required to name the duplicate files. See Also: "Specifying Alternative Names for Duplicate Database Files" for an explanation of the more complex strategy of using different names for the duplicate files Step 3: Making Backups Accessible to the Duplicate Instance Note: If you are performing active database duplication, then skip this section and proceed to "Step 4: Preparing Remote Access to Databases".
4 4 3:Oracle Duplicate Database
When duplicating with a target and recovery catalog or just a target connection, RMAN uses metadata in the RMAN repository to locate backups and archived redo log files needed for duplication. If RMAN is not connected to a catalog, as may be the case when performing backup-based duplication with a target connection, then RMAN obtains metadata from the control file.
Unless you are duplicating without a connection to the target and to the recovery catalog, the names of the backups must be available with the same names recorded in the RMAN repository. Ensure that auxiliary channels on the destination host can access all data file backups and archived redo log files required to restore and recover the duplicate database to the desired point in time.
DUPLICATE from ACTIVE Database Using RMAN, a Step-by-Step Guide
If not, duplication fails. The archived redo log files can be available either as image copies or backup sets.
You can mix full and incremental backups of individual data files, but a full backup of every data file is required. To make SBT backups accessible to the auxiliary instance: If necessary, install media management software on the destination host. Make the tapes with the backups accessible to the destination host.
Typically, you do one of the following: Physically move the tapes to a drive attached to the remote host. Use a network-accessible tape server. If necessary, inform the remote media management software about the existence of the tapes.
Making Disk Backups Accessible to the Auxiliary Instance When you make disk backups accessible to the auxiliary instance, your strategy depends on whether or not you duplicate the database while connected to the target or recovery catalog.
In the latter case, you do not need to preserve the name or the original path of the backup or copy. It is not required that all of the backups be from the same point in time, or that they all be backup sets, or all image copies. Listening Endpoints Summary Service "hrms" has 1 instance s. The command completed successfully.
All rights reserved. Service "crms" has 1 instance s. Used parameter files: Release Connected to an idle instance. It is must and should. From 11g we can clone databases using the from active database option. In this case we do NOT require an existing backup, the active datafiles will be used as the source for the clone. Shuts down the instance and restarts it with the new spfile.
Restores the controlfile from the backup. Mounts the database.
Restore all datafiles. RMAN creates all files in the converted names. RMAN will then start the new duplicate auxiliary instance with the updated server parameter values. If you specify the from active database clause in the duplicate command,then the source instance must be using a serverparameter file.
You can also choose to use the spfile clause to name the files and supplement that technique with one or more of the alternative techniques. Use the Oracle-recommended spfile clause in the duplicate command to set all necessary parameters involving file names for the duplicate database. Use spfile The set clause lets you specify initiali zation parameters to the values you want.
In essence, the set functionality amounts to temporarily stopping the database duplication process in midstream after restoring the server parameter file and issuing the alter system set statement to change the initialization parametervalues.
Performing Active Duplication You use the familiar RMAN command, duplicate database, to perform active database duplication,with one importantmodification—you add the new clause from active database toindicate that the source database files must be copied directly from the target database rather than from the target database backups,as is the case in normal database duplication. If the destination database is on a different server,the spfile is copied to the new server.
If you want to override the source database settings for any initialization parameters of thedestination database,you can do so by using one or more set clauses. The set clause specifies the value of a specifiedinitialization parameter. In the example,the source and the duplicate databases are on the same host, so we make sure we use different through a transfer of files over the network through the Oracle Net???
To make sure the source database can connect to the auxiliary instance by means of a net service name, you must make the net service name available on the source database instance. Add the auxiliary instance, which we named test1, to the listener. The next step is to create an initialization parameter file for the auxiliary instance.
When you perform active database duplication, you must use a password file for the auxiliary instance. Use the same sysdba password in this password file as that of the source database.
Since you specified the spfile clause in the duplicate database command, RMAN will copy the source database parameter file to the destination host.
You can leave the source database open or in the mount state. If the source database is open,it must be running in archivelog mode. You must connect to the source database,which you are duplicating to the auxiliary instance.Santosh Nath. The farthest point of recovery of the duplicate database is the most recent redo log file archived by the source database. Establishing Connectivity in Required Cases To create a password file manually: Follow the instructions in Oracle Database Administrator's Guide to create a password file.
To create an initialization parameter file and start the auxiliary instance: Preparing Remote Access to Databases".
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When you use backups from different points in time, the backup location must contain archived logs covering the time from the start of the oldest backup until the desired recovery point. Step 1: Choosing a Duplication Technique Your business requirements and the database environment determine which duplication technique is best for your situation.
Unless you are duplicating without a connection to the target and to the recovery catalog, the names of the backups must be available with the same names recorded in the RMAN repository. If the backup location contains backup files from multiple databases, then the DATABASE clause must specify the name of the database that is to be duplicated.
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