Oracle Database 11 g - Online Public Access Catalog

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298 CHAPTER 6 ■ BACKUP AND RECOVERYpassword file clause in the duplicate database command. In this example, the password filewas created manually instead of specifying the password file clause.When you perform active database duplication over the network, the various files that arepart of the database duplication are copied or re-created, as shown in the following list:• Datafiles are copied from the source database.• Controlfiles are re-created but will be copied from the source database if you specify thefor standby clause.• Tempfiles are re-created in the location set by the db_create_file_dest parameter.• Online redo log files are re-created.• Archived redo logs are copied from the source database, but only if needed for duplication.• The server parameter file is copied from the source database, but only if you use thespfile clause.• The password file is copied for standby databases always, but for a duplicate database,it’s copied only if you specify the password file option in the duplicate database command.• Flash recovery area files aren’t copied during the duplication. Similarly, the duplicationdoesn’t re-create the flashback log files, the password file, or the block change tracking file.To create a standby database instead of a duplicate database, just replace the to auxdb partof the duplicate database command with the for standby clause, as shown in the followingexample:RMAN> duplicate target database2> for standby3> from active database4> spfilePlease refer to Chapter 10 for complete details on duplicating databases for physical standbydatabases using the active database duplication method.It’s easy to duplicate a non-ASM file-based database to an ASM file system. To do this, firstcreate an ASM disk group, before running the duplicate database command. Here’s an example:RMAN> duplicate target database2> to newdb3> from active database4> spfile5> parameter_value_convert'/u01/app/oracle/oradata/prod1/', '+DISK2'6> set db_create_file_dest = +DISK2;The duplicate database command shown here creates a database with all of its datafiles,controlfiles, and online redo logs in the ASM disk group +DISK2.If you want faster duplication of a database, you must increase the number of disk channels onthe source database, which leads to a parallel copying of the source database files.
CHAPTER 6 ■ BACKUP AND RECOVERY 299Recovery Catalog ManagementThere are two significant changes in Oracle Database 11g in the way you manage the RMANrecovery catalog:• You can now merge two or more recovery catalogs using the new import catalog command.You can use a variation of the import catalog command to move a recovery catalog to anew database.• You can limit the RMAN metadata that a specific user can access by creating virtualprivate catalogs.The following sections show how to merge recovery catalogs as well as introduce the newvirtual private catalog feature.Merging Recovery CatalogsIt’s common for DBAs to create multiple recovery catalogs, each for a different Oracle version,in order to store RMAN data for multiple Oracle databases. In some companies, DBAs evenseparate development/QA and production recovery catalogs. The management of the multiplerecovery catalogs often gets to be a problem. Oracle Database 11g lets you designate a singlecatalog schema for all your Oracle databases by using the new import catalog command toimport a recovery catalog schema into another recovery catalog schema. You can merge anentire recovery catalog, or just the metadata pertaining to a specific database or databases, intoanother recovery catalogBefore Oracle Database 11g, there was no way to combine contents from one recoverycatalog to another without having to actually use the export and import utilities to perform adata migration between two recovery catalogs.To illustrate the recovery catalog merging feature, we’ll use multiple recovery catalogs,one of which will serve as the destination target, meaning the recovery catalog into which youwant to merge one or more other recovery catalogs.In Oracle Database 11g, you can merge recovery catalogs with the new import catalogcommand. In the following example, the destination recovery catalog schema is located in therecovery catalog database rman11. The list incarnation command shows that there are currentlytwo databases (ELEVEN and ORCL11) registered in this recovery catalog:RMAN> list incarnation;List of Database IncarnationsDB Key Inc DB Name DB ID STATUS Reset SCN Reset Time------ ---- ------ ---------- ------ --------- -----------192 207 ELEVEN 3481526915 PARENT 1 22-NOV-06192 193 ELEVEN 3481526915 CURRENT 909437 13-MAR-071 15 ORCL11 3863017760 PARENT 1 22-NOV-061 2 ORCL11 3863017760 CURRENT 909437 03-MAR-07RMAN>
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The EXPERT’s VOIce ® IN ORACLEAl
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