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Oracle datafiles make up the largest part of the physical storage of your database. A datafile can belong to only one database, and one or more datafiles constitute the logical entity called the tablespace, which I described earlier in this chapter. Oracle datafiles constitute most of a database s total space. When the database instance needs to read table or index data, it reads that from the datafiles on disk, unless that data is already cached in Oracle s memory. Similarly, the database writes new table or index data or updates to existing data to the datafiles on disk for permanent storage. To be able to use the disk for storing your data, directories and a file system must be created for you by the system administrator. You also need all the proper rights to read from and write to these directories and files. Then, when you create a tablespace, you assign it these datafiles. Before you
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CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
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create a database, your system administrator will assign a certain amount of disk space for the database based on your initial sizing estimates. All the administrator gives you are the assigned mount points for the various disks (for example, /prod01, /prod02, /prod03, and so on). You then need to create your directory structure under the mount points. After you install your software and create the Oracle administrative directories, you can use the remaining file system space for storing database objects, such as tables and indexes. Oracle-managed files, which were introduced in Oracle8i (and which we ll discuss shortly), simplify the administration of Oracle databases. The Oracle Managed Files (OMF) feature eliminates the need for you to manage operating system files. You simply specify your database operations in terms of database objects, without using filenames. The OMF feature aims at relieving DBAs of their traditional file-management tasks. When you use the OMF feature, you don t have to worry about the names and locations of the physical files. Instead, you can focus on the objects you re creating. Oracle will automatically create and delete files on the operating system as needed. The OMF-based files are ideal for test and small databases, but if you have a terabyte-sized database with a large number of archived logs and redo logs, you need flexibility, which the OMF file system can t provide. OMF drastically simplifies both the initial database creation as well as the management tasks. If you want to use OMF with your database, read the discussion of OMF in 17, where you ll learn how to create and manage OMF-based files. For example, suppose you create a tablespace called customer01 with a 500MB datafile. As you load more data into your database, Oracle will allocate new extents to the database tables by allocating space from the datafile. When the table uses up almost all of the initial 500MB space allocation, you need to enlarge the tablespace by adding a new datafile to it. You may alternatively increase the size of the existing datafile by resizing it as well. If you don t, the table can t increase in size, and any attempts to add data to it will result in an error. Although the database places the data in actual datafiles, there is no direct link between the tables and indexes and the datafiles they are placed in. These objects are only linked to the logical tablespace; it is the tablespace that is linked to the datafiles. Thus, Oracle maintains a separation between the logical objects (such as tables) and the physical datafiles. In other words, there is no direct connection during object creation or growth between the object and the datafiles it resides in. You can create or move an existing table or index by specifically declaring the tablespace, but you can t specify a datafile directly.
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