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Similarly, when you want to drop a tablespace, you just need to issue the DROP TABLESPACE command and the OMF datafiles are automatically removed by Oracle, along with the tablespace definition: SQL> DROP TABLESPACE finance01; OMF files are definitely easier to manage than the traditional manually created operating system files. However, there are some limitations: OMF files can t be used on raw devices, which offer superior performance to operating system files for certain applications (such as Oracle Real Application Clusters). All the OMF datafiles have to be created in one directory. It s hard to envision a large database fitting into this one file system. You can t choose your own names for the datafiles created under OMF. Oracle will use a naming convention that includes the database name and unique character strings to name the datafiles. Oracle recommends using OMF for small and test databases. Normally, if you drop a datafile, the database won t have any references to the datafile, 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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Benefits of Using OMF
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You can create tablespaces with OMF-based files. You can also specify that your online redo log files and your control files are in the OMF format. OMF files offer several advantages over user-managed files: Oracle automatically creates and deletes OMF files. You don t have to worry about coming up with a naming convention for the files. It s easy to drop datafiles by mistake when you re managing them. With OMF files, you don t run the risk of accidentally deleting database files. Oracle automatically deletes a file when it s no longer needed. You can have a mix of traditional files and OMF files in the same database. In the following sections, we ll look at the OMF feature in some detail.
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You can create OMF files when you create the database, or you can add them to a database that you created with traditional datafiles later on. Either way, you need to set some initialization parameters to enable OMF file creation.
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Initialization Parameters for OMF
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You need to set three initialization parameters to enable the use of OMF files. You can set these four parameters in your parameter file, and you can change them online with the ALTER SYSTEM or ALTER
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SESSION statement. You can use each of these parameters to specify the file destination for different types of OMF files, such as datafiles, control files, and online redo log files: DB_CREATE_FILE_DEST: This parameter specifies the default location of datafiles, online redo log files, control files, block-change tracking files, and tempfiles. You can also specify a control file location if you wish. Unfortunately, the DB_CREATE_FILE_DEST parameter can take only a single directory as its value; you can t specify multiple file systems for the parameter. If the assigned directory for file creation fills up, you can always specify a new directory, because the DB_CREATE_FILE_DEST parameter is dynamic. This enables you to place Oracle datafiles anywhere in the file system without any limits whatsoever. DB_CREATE_ONLINE_LOG_DEST_n: You can use this parameter to specify the default location of online redo log files and control files. In this parameter, n refers to the number of redo log files or control files that you want Oracle to create. If you want to multiplex your online redo log files as Oracle recommends, you should set n to 2. DB_RECOVERY_FILE_DEST: This parameter defines the default location for control files, archived redo log files, RMAN backups, and flashback logs. If you omit the DB_CREATE_ONLINE_LOG_DEST_n parameter, this parameter will determine the location of the online redo log files and control files. The directory location you specify using this parameter is also known as the flash recovery area, which I explain it in detail in 10. In addition to the preceding three initialization parameters, the DB_RECOVERY_FILE_DEST_SIZE parameter specifies the size of your flash recovery area. If you don t specify any of these initialization parameters in your init.ora file or SPFILE, you can still use the ALTER SYSTEM command to dynamically enable the creation of OMF files, as shown in the following example: SQL> ALTER SYSTEM SET DB_CREATE_FILE_DEST = 2 '/test01/app/oracle/oradata/finance1'; System altered. SQL> As long as you specify the DB_CREATE_FILE_DEST parameter, you can have Oracle create OMF files for you, and you can use both the user-managed and OMF files simultaneously without a problem.
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