tailieunhanh - OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P70

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P70:There is an ever increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. | OCA OCP Oracle Database 11g All-in-One Exam Guide 646 4. If you wish the new user to have privileges on databases already registered issue this command grant catalog for database dbname to vpcowner where dbname is the name of an already registered database that you wish vpcowner to manage. 5. As vpcowner connect to the catalog with RMAN and issue the command create virtual catalog 6. Using RMAN connect to the catalog as vpcowner and to the target as SYS register the target if was not previously registered and then carry out backup and restore operations as normal. The owner of a virtual private catalog will have no access to backups relating to databases not registered in their domain and need have no object or tablespace privileges in the catalog database nor any system privileges beyond those granted in Step 2. TIP A GRANT REGISTER DATABASE will insert a row in VPC_USERS a table in the catalog owner s schema. A GRANT CATALOG FOR DATABASE will insert a row in the VPC_DATABASES table. The virtual catalog owner has synonyms that allow these tables which are used to filter access to be seen. Protecting and Rebuilding the Catalog If the recovery catalog is not available RMAN can still function but it will be crippled. Because the RMAN repository is always stored in the target databases controlfiles loss temporary or permanent of the catalog is not disastrous. But the controlfile-based repository will only hold a relatively small amount of information all data older than the CONTROLFILE_RECORD_KEEP_TIME parameter will be overwritten. So while backups can still be performed any restore and recover operations will be much harder. Backup sets and image copies going back weeks may be available but RMAN will not be able to find them. Furthermore any stored scripts will also be unavailable. It is therefore necessary to protect the catalog database. And worst of all if all copies of the controlfile itself are lost then RMAN will be useless unless the controlfile autobackup .

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