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ops$tkyte@ORA10G> alter table partitioned 2 add constraint 3 partitioned_pk 4 primary key(id) 5 / alter table partitioned * ERROR at line 1: ORA-01408: such column list already indexed Here, Oracle attempts to create a global index on ID, but finds that it cannot since an index already exists The preceding statements would work if the index we created was not partitioned, as Oracle would have used that index to enforce the constraint The reasons why uniqueness cannot be enforced, unless the partition key is part of the constraint, are twofold First, if Oracle allowed this, it would void most of the advantages of partitions Availability and scalability would be lost, as each and every partition would always have to be available and scanned to do any inserts and updates The more partitions you had, the less available the data would be.

ops$tkyte%ORA11GR2> select table_name, partition_name 2 from user_tab_partitions 3 where table_name in ( 'ORDERS', 'ORDER_LINE_ITEMS' ) 4 order by table_name, partition_name 5 / TABLE_NAME -----------------------------ORDERS ORDERS ORDER_LINE_ITEMS ORDER_LINE_ITEMS PARTITION_NA -----------PART_2009 PART_2010 PART_2009 PART_2010

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If you use the recovery catalog, you can store backup and recovery scripts directly in it. RMAN can perform simulated backups and restores. RMAN enables you to make image copies, which are similar to operating system-based backups of files. RMAN can be easily integrated with powerful third-party media management products to make tape backups effortless. RMAN is integrated well with the OEM backup functionality, so you can schedule backup jobs easily for a large number of databases through a common management framework. You can easily clone databases and maintain standby databases using the RMAN functionality. As the preceding list clearly shows, it s no contest when it comes to the question of whether you should be using operating system-based backup and recovery techniques (user-managed backup and recovery) or RMAN. Therefore, you ll see quite a bit of discussion about RMAN in this chapter and the next, which deals with recovering databases. Oracle maintains that both RMAN and traditional user-managed backup and recovery methods are equally valid and effective, but recommends the use of RMAN.

RMAN operates via server sessions connecting to the target databases, which are the databases you want to back up or recover The collection of information about the target database such as its schema information, backup copy information, configuration settings, and backup and recovery scripts is called the RMAN repository RMAN uses this metadata about the target databases to perform its backup and recovery activities RMAN periodically retrieves metadata from the target database control file and saves it in the recovery catalog Following is a list of the entities that enable RMAN to perform its backup and recovery functions: Target database: This is the database that the RMAN needs to back up RMAN server sessions running in the target database perform the backup and recovery operations RMAN repository: This is RMAN s metadata about backups, archived redo logs, and its own activities.

The more partitions you had, the more index partitions you would have to scan, and the less scalable partitions would become Instead of providing availability and scalability, doing this would actually decrease both Additionally, Oracle would have to effectively serialize inserts and updates to this table at the transaction level This is because if we add ID=1 to PART_1, Oracle would have to somehow prevent anyone else from adding ID=1 to PART_2 The only way to do this would be to prevent others from modifying index partition PART_2, since there isn t anything to really lock in that partition In an OLTP system, unique constraints must be system enforced (ie, enforced by Oracle) to ensure the integrity of data This implies that the logical model of your application will have an impact on the physical design.

we can see that the two tables have the same exact structure. Further, since the database understands these two tables are related, we can drop the parent table partition and have it automatically clean up the related child table partitions (since the child inherits from the parent, any alteration of the parent s partition structure cascades down): ops$tkyte%ORA11GR2> alter table orders drop partition part_2009 update global indexes; Table altered. ops$tkyte%ORA11GR2> select table_name, partition_name 2 from user_tab_partitions 3 where table_name in ( 'ORDERS', 'ORDER_LINE_ITEMS' ) 4 order by table_name, partition_name 5 / TABLE_NAME -----------------------------ORDERS ORDER_LINE_ITEMS PARTITION_NA -----------PART_2010 PART_2010

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