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Cytat
Do celu tam się wysiada. Lec Stanisław Jerzy (pierw. de Tusch-Letz, 1909-1966)
A bogowie grają w kości i nie pytają wcale czy chcesz przyłączyć się do gry (. . . ) Bogowie kpią sobie z twojego poukładanego życia (. . . ) nie przejmują się zbytnio ani naszymi planami na przyszłość ani oczekiwaniami. Gdzieś we wszechświecie rzucają kości i przypadkiem wypada twoja kolej. I odtąd zwyciężyć lub przegrać - to tylko kwestia szczęścia. Borys Pasternak
Idąc po kurzych jajach nie podskakuj. Przysłowie szkockie
I Herkules nie poradzi przeciwko wielu.
Dialog półinteligentów równa się monologowi ćwierćinteligenta. Stanisław Jerzy Lec (pierw. de Tusch - Letz, 1909-1966)
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.Figure 7-2: MML ArchitectureRecovery Oracle ServerMMLManager ProcessMedia ManagementServer SoftwareStandalone tapeor automatedtape libraryIn Figure 7-2: MML Architecture, the Oracle executable is the same executablethat is started when a user connects to the database.MML is the MediaManagement Library, which is media management, vendor-suppliedsoftware.Software routines in the MML are called by Oracle to back up andrestore.In the following example, a Recovery Manager script performs a datafilebackup:run {allocate channel t1 type SBT_TAPE ;backupformat df_%s_%t(datafile 10);}When Recovery Manager executes this command, it sends the backup requestto the Oracle server process that will be performing the backup.The Oracleserver process identifies the output channel as the type SBT_TAPE , andrequests the MML to load the tape and write the output, among other things.7-4 Oracle8 Backup and Recovery Guide If the channel type was disk, Oracle would not have connected to the MMLsoftware because Oracle can write to disk without the assistance of third-partyintegration software.See Also: For information about vendors offering software integrated withRecovery Manager, see your Oracle representative.Backing Up Using Enterprise ManagerYou can perform Recovery Manager backups using Oracle EnterpriseManager-Backup Manager software, which is a graphical user interface toRecovery Manager.See Also: See your operating system-specific documentation for moreinformation.The Recovery CatalogThe recovery catalog is a repository of information that is used and maintainedby Recovery Manager.Recovery Manager uses the information in the recoverycatalog to determine how to execute requested backup and restore actions.The recovery catalog contains informations about the following:" datafile and archivelog backup sets and backup pieces" datafile copies" archived redo logs and copies of them" tablespaces and datafiles at the target database" named user-created sequences of Recovery Manager and SQLcommands called stored scriptsRecovery Manager Concepts 7-5 Figure 7-3: The Recovery CatalogOracleOracleRecovery Manager RecoveryRecoveryCatalogCatalogOracle8DatabasesControl File(s)Operating with a Recovery CatalogOracle recommends you use Recovery Manager with a recovery catalog,especially if you have 20 (or more) datafiles.You must frequentlyresynchronize the recovery catalog with the target database control file to keepit up to date.The more up-to-date the recovery catalog is, the easier it will beto recover.For example, if you have 25 archive logs that have been createdsubsequent to the last resynchronization, and you experience a failurerequiring that you restore the entire database and control file, you must firstcatalog these files with the recovery catalog before you can use them.The recovery catalog is maintained solely by Recovery Manager, and thetarget database never accesses it directly.Recovery Manager propagatesinformation about the database structure, archived redo logs, backup sets anddatafile copies into the recovery catalog from the target database s control file.You do not need an additional database which is solely for the recoverycatalog.You can put the recovery catalog in an existing database.It is thedatabase administrator s responsibility to make the recovery catalog databaseavailable to Recovery Manager.Database administrators are also responsiblefor taking backups of the recovery catalog.Since the recovery catalog residesin an Oracle database, administrators can use Recovery Manager to back it upby reversing the roles of the recovery catalog database and the target database.In other words, the target database can become the recovery catalog databaseand the recovery catalog database can be treated as a target database.A single recovery catalog is able to store information for multiple targetdatabases
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