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OMF makes managing datafiles, 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 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.

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.

Figure 1-11. Classes that have type coupling The link myReference is a reference to an object of type Class2. The reference to Class2 introduces a flavor of coupling that I ll call type coupling. Type coupling is designated using the symbol subscripted with an uppercase T. When using myReference to call methods in Class2, Class1 uses a statement indicating the name of the method to call. In C#, the statement would be myReference.Method1(); Class methods (also called static or shared methods in some languages) might have a class name in place of an instance name. In order to compile Class1, the compiler must have access to Class2 to get a description of the structure of Class2. Class1 is thus type-coupled to Class2 and won t be compilable if Class2 is missing.

You can create OMF files when you create the database, or you can add them to your traditionally created database later on. Either way, you need to set some initialization parameters to enable OMF file creation.

You need to set four initialization parameters to enable the use of OMF files. You can set these three parameters in your parameter file, and you can change them online with the ALTER SYSTEM or ALTER

What s an external type Given a type T1, a type T2 is external to T1 if defined outside T1. Type coupling can be static and/or dynamic. To understand when it s static and when it s dynamic, you have to be more specific about what T1 references in T2 and how T1 uses the reference. Type coupling is introduced in two basic situations: If T1 creates instances of T2 If T1 contains references to T2 Each scenario introduces its own subflavor of type coupling, as described in the next sections.

SESSION statement You can use each of these parameters to specify the file destination for different types of OMF files: DB_CREATE_FILE_DEST: This parameter specifies the default location of datafiles, block-change tracking files, and temporary files If you don t use any of the DB_CREATE_ONLINE_LOG_DEST_n parameters, Oracle uses the DB_CREATE_FILE_DEST parameter value as the default location for all Oracle managed control files and online redo logs 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_RECOVERY_FILE_DEST_SIZE: This parameter specifies the size of your flash recovery area.