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structure to which the database allocates the datafiles in the tablespace. Let s therefore look at datafiles first in the following section.
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A tablespace can have one or more datafiles, and a datafile can belong to only one tablespace. Oracle creates a datafile for a tablespace when you specify the keyword DATAFILE during tablespace creation. The datafile that is created will be allocated a certain amount of physical disk space from the operating system disks. When Oracle first creates a datafile, it s empty but is allocated exclusively for Oracle s use, and the free space shown by the df -k command shows it as used space from the operating system s point of view. As a segment grows in size, Oracle allocates extents to it from the free space in its datafiles. When the tablespace starts to fill up, you can either add new datafiles to it or extend the size of the existing datafiles by using the RESIZE command. In light of the benefits they offer, you should always create locally managed tablespaces with the default AUTOALLOCATE option, unless you expect the tablespace to contain objects of the same size requiring same-sized extents. Similarly, choose the default automatic segment space management (by specifying SEGMENT SPACE MANAGEMENT AUTO when creating a tablespace) for managing segments, because it gives better performance and space utilization than manual segment space management. As mentioned previously, AUTOALLOCATE is the default for extent management, and automatic segment space management is the default for segment space management. Let s create a (permanent) tablespace by using the CREATE TABLESPACE command. Note that you must use a DATAFILE clause before the file specification, since this is a permanent tablespace. For a temporary tablespace, you must use the clause TEMPFILE instead. SQL> CREATE TABLESPACE test01 2 DATAFILE '/pasx02/oradata/pasx/test01.dbf' 3* SIZE 500M; Tablespace created. SQL>
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Non-DBA users must have the CREATE TABLESPACE system privilege granted in order to be able to create a tablespace.
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In the previous tablespace creation statement, I didn t specify any choices for extent management (local or dictionary), extent size (uniform or autoallocate), or segment space management (auto or manual). Now, let s execute the following query to determine the defaults for extent management, extent allocation type, and segment space management: SQL> 2 3 4 5* SELECT extent_management, allocation_type, segment_space_management FROM dba_tablespaces WHERE tablespace_name='TEST01'; ALLOCATIO --------SYSTEM SEGMEN ------AUTO
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EXTENT_MAN ---------LOCAL SQL>
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Note the defaults in Oracle Database 11g Release 1:
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Extent management: LOCAL Allocation of extent sizes: AUTOALLOCATE (shows up as SYSTEM in the preceding output) Segment space management: AUTO I could create an identical tablespace by explicitly specifying all of these choices, as shown here: SQL> 2 3 4 5* CREATE TABLESPACE test02 DATAFILE '/pasx02/oradata/pasx/test02.dbf' size 500M EXTENT MANAGEMENT local AUTOALLOCATE 500M SEGMENT SPACE MANAGEMENT auto;
Tablespace created. SQL> Although by default extent management is local for all permanent tablespaces, you specify the EXTENT MANAGEMENT LOCAL clause in the CREATE TABLESPACE statement if you want to specify the autoallocate or the uniform clause for extent allocation. You can use the same query that I used in the case of the test01 tablespace to verify that the two tablespaces, test01 and test02, have identical extent management (LOCAL), allocation type (AUTOALLOCATE), and segment space management (AUTO).
Note
By default, Oracle Database 11g tablespaces are locally managed, with automatic segment space management. When you create this type of tablespace, you can specify default storage parameters, like INITIAL, NEXT, PCTINCREASE, MINEXTENTS, or MAXEXTENTS, but the database will ignore the settings.
Extent Allocation and Deallocation
An Oracle extent consists of a set of contiguous data blocks, which are the smallest unit of space allocation in Oracle. Each Oracle data block corresponds to a specific number of bytes of disk space. Each of your database tables and indexes is called a segment, which is a set of extents allocated for a specific data structure. Note that extents are always contiguous in an operating system file, but not necessarily so on the disk itself. Extents help performance by enhancing Oracle s ability to prefetch data required for queries. Each partition of a table or index has its own segment (and besides table and index segments, you also have rollback, temporary, and undo segments in an Oracle database). When Oracle needs to allocate an extent to a segment, it first selects a candidate datafile and searches the datafile s bitmap for the required number of adjacent free blocks. If it can t find the necessary free space in that datafile, Oracle will look in another datafile, or if there are no more, it will issue an error stating that it is out of free space. Once Oracle allocates space to a segment by allocating a certain number of extents to it, that space will remain with the extent unless you make an effort to deallocate it. If you truncate a table with the DROP STORAGE option (TRUNCATE TABLE table_name DROP STORAGE), for example, Oracle deallocates the allocated extents. You can also manually deallocate unused extents using the following command: SQL> ALTER TABLE table_name DEALLOCATE UNUSED; When Oracle frees extents, it automatically modifies the bitmap in the datafile where the extents are located, to indicate that they are free and available again.
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