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3. Delete the control file parameter from the SPFILE, since Oracle will create new control files in the OMF file destinations by restoring them from the non-ASM database control files. 4. Start the database with the STARTUP NOMOUNT command: RMAN> CONNECT TARGET; RMAN> STARTUP NOMOUNT; 5. Restore the old control file in the new location, as shown here: RMAN> RESTORE CONTROLFILE from '/u01/orcl/oradata/control1.ctl'; 6. Mount the database: RMAN> ALTER DATABASE MOUNT; 7. Use the following command to copy your database files into an ASM disk group: RMAN> BACKUP AS COPY DATABASE FORMAT +dgroup1; 8. Use the SWITCH command (discussed in 16) to switch all datafiles into the ASM disk group dgroup1: RMAN> SWITCH DATABASE TO COPY; At this point, all datafiles will be converted to the ASM type. You still have your original datafile copies on disk, which you can use to restore your database if necessary. 9. Open the database with the following command: RMAN> ALTER DATABASE OPEN; 10. For each redo log member, use the following command to move it to the ASM system: RMAN> SQL "alter database rename '/u01/test/log1' to '+dgroup1' "; 11. Archive the current online redo logs, and delete the old non-ASM redo logs. Since RMAN doesn t migrate temp files, you must manually create a temporary tablespace using the CREATE TEMPORARY TABLESPACE statement. You ll now have an ASM-based file system. You still have your old non-ASM files as backups in the RMAN catalog, and you can delete them if you need the space.

Type coupling is the most common coupling flavor found in software systems. When developing nontrivial object-oriented software systems, you split the design into a series of classes. The classes collaborate through associations, relationships, and links to implement the system requirements. A typical form of collaboration is through method calls, as shown in Figure 1-11.

Instead of going through the cumbersome RMAN migration exercise shown in the previous section, you can simply use the Database Control interface to easily convert your current database to an ASM database. Here are the first few steps: 1. From the Database Control home page, click the Administration tab. 2. In the Change Database group, click the Migrate to ASM link. 3. You ll now be on the Migrate to ASM Database page, as shown Figure 17-5. At this point, make sure you have an ASM instance running on your server. After that, provide the necessary information on the pages that follow to convert your database to ASM.

Oracle Database 11g provides several automatic space-management features. These features eliminate the need for manually performing several traditional space-management chores. In this section, you ll learn about the following automatic space-management features: Automatic Undo Management Resumable Space Allocation Automatic Online Segment Shrinking

Undo refers to the before-image of data as it existed before the start of a transaction. All the concurrent transactions running in your database need to be able to fit into the undo space allocated for them, or you re going to have transaction failures. Rollback segment contention and space management used to be big database management issues, but when you use Oracle s recommended Automatic Undo Management (AUM) mode, you don t have to worry about these problems anymore. Under manual rollback management, you manually manage the rollback segments and have to worry about specifying large segments for large transactions to avoid snapshot-too-old errors. In addition, you have to worry about contention for rollback segments, proper sizing of the segments, and the correct number of segments. When you choose AUM mode, you simply create a dedicated undo tablespace, select the undo retention period, and Oracle will do the rest.

Class2 +Method1()

Oracle introduced AUM in the Oracle9i release. Under AUM, the rollback segments are internally created and are called undo segments. Oracle handles issues such as the number and size of the rollback segments, block contention, and maintenance of read consistency. When you create the undo tablespace during database creation, Oracle creates a set of undo segments, and Oracle automatically increases the number and size of these segments according to an internal algorithm, based on database workload.