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The principle of this type of backup is to have mirrored copies of database files on disks that can be temporarily detached, attached to a second host for backup, and then resynchronized. The advantage of this type of configuration is that downtime for backup is minimized. BRBACKUP supports this type of configuration both for online and offline backups, and includes all the required options for performing the backups in the second host and then resynchronizing the disks. In the case of offline backups with split mirror disks, the R/3 system must be shut down for a few minutes for the process of detaching the mirror; right after that the system can be started again. In online backups there is no need to shut down R/3. In order to set up this type of backup strategy, some software configuration must be performed on the hosts. The init<sid>.sap parameters must be configured as well for example, setting the split commands and the backup types.
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Asynchronous or deferred verification of backups has the advantage of decoupling the process of backup from the verification, thus reducing the time required for backup completion. Verification options include using BRBACKUP verify (option w), BRARCHIVE verify, or BRRESTORE verify, this last option being an independent verification of backups. These verifications, which mostly include volume comparison or tape readibility, can be complemented by a check of the internal Oracle block structure using the DB_VERIFY tool. This tool is invoked using the option use_dbv together with the BRBACKUP or BRRESTORE programs.
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Introduction to Database Restore and Recovery Concepts and Procedures
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During operation of the database, different types of software problems and hardware failures might arise and cause data inconsistencies, and the only solution to reset the database to a consistent situation would be to perform a restore and recovery of the database using previous backup copies. The number of problem situations as well as the changing circumstances when errors do occur make it quite difficult to cover comprehensively in a few pages all possibilities for the restore and recovery procedures in SAP R/3 installations. The next sections introduce the concepts and the available tools, whereas more detailed information can be found in official SAP and Oracle documentation. Restore and recovery should only be performed by experienced database administrators, since a wrong analysis of the situation or a mistaken function might lead, in the worst case, to loss of important business data. For this reason, it is important that a comprehensive backup and restore strategy is well defined and tested before actual productive operation of the R/3 systems. Tests should include the largest number of possible circumstances for both physical and logical database errors. 16 includes a section on backup strategies. The key to a successful strategy is to understand clearly the elements underlying the database architecture, the critical database files and processes, and the backup and recovery concepts. 579
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Recovery Concepts The next topics deal only with the Oracle database backup and restore concepts and procedures as supported by the sapdba tool and related utilities. For backing up and restoring other nondatabase files, you can use sapdba or any other standard operating system or third party backup tools. These other files, such as the SAP executables, Oracle runtime, or operating system files, are normally more static and can be restored from normal backups without affecting the consistency of the database data. A recovery is the full responsibility of the database administrator. Since this can be a complex procedure, options on available menus should be protected by expert mode. When in a situation where a restore and recovery seems to be needed, the first step should be to analyze the error situation, then check the SAPnet notes, and, when in doubt, contact the SAP hotline for support in the recovery procedure. This is a good place to stress the importance of testing and documenting a backup and recover procedure while building and configuring the technical infrastructure in the implementation phase of SAP projects.
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