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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 on the Administration tab. 2. In the Change Database group, click on the Migrate to ASM link. 3. You ll now be on the Migrate to ASM Database page, as shown Figure 17-6. 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.
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CHAPTER 17 AUTOMATIC MANAGEMENT AND ONLINE CAPABILITIES
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Figure 17-6. Using Database Control to migrate to ASM
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Automatic Space Management
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Oracle Database 10g 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: Locally managed tablespaces Automatic undo management Resumable Space Allocation Oracle Managed Files Automatic online segment shrinking
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Locally Managed Tablespaces
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Space management has been one of the most time-consuming Oracle DBA tasks for many years. DBAs used to worry about tablespace fragmentation, and they devoted considerable time to reorganizing database objects to coalesce fragmented free space in tablespaces. The use of locally managed databases frees up DBAs from routine space-management tasks and improves the performance of DML and of certain DDL operations. In Oracle Database 10g, by default, permanent tablespaces are created as locally managed tablespaces. If you currently have dictionary-managed tablespaces, you can convert to locally managed tablespaces using Oracle s DBMS_SPACE_ADMIN package.
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CHAPTER 17 AUTOMATIC MANAGEMENT AND ONLINE CAPABILITIES
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When you use locally managed tablespaces, you can choose the Automatic Segment Space Management (ASSM) feature to manage segment space. ASSM provides you both better space utilization as well as better database performance, compared to traditional manual segment-spacemanagement techniques. In Oracle 10.2, ASSM is the default for all permanent, locally managed tablespaces.
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Note
5 provides more details about locally managed tablespaces and the ASSM feature.
Automatic Undo Management
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. 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.
Note
6 discusses the setting up and management of Automatic Undo Management in detail.
Easy File Management with OMF
Oracle Managed Files (OMF) makes managing data files, control files, redo log files, and RMAN backup files a lot easier than managing the various files at the operating system level. Normally, if you drop a data file, the database won t have any references to the data file, but the physical file still exists in the old location you have to explicitly remove the physical file yourself. If you use OMF, Oracle will remove the file for you when you drop it from the database. According to Oracle, OMF file systems are most useful for databases using Logical Volume Managers that support RAID and extensible file systems. Smaller databases benefit the most from OMF, because of the reduced file-management tasks. Test databases are another area where an OMF file system will cut down on management time. You have to use operating system based files if you want to use the OMF feature; you can t use raw files. You do lose some control over the placement of data in your storage system when you use OMF files, but even with these limitations, the benefits of OMF file management can outweigh its limitations in some circumstances.
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