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Remember that extents are the units of space allocation when you create tables and indexes in tablespaces. Here is how Oracle determines extent sizing and extent allocation when you create tablespaces:
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The default number of extents is 1. You can override it by specifying MINEXTENTS during tablespace creation. You don t have to provide a value to the MAXEXTENTS parameter when you use locally managed tablespaces. Under locally managed tablespaces, the MAXEXTENTS parameter is set to UNLIMITED, and you don t have to configure it at all. If you choose UNIFORM extent size, the size of all extents, including the first, will be determined by the extent size you choose. Three examples of tablespace creation with various specifications for extent management are shown in Listings 6-1 through 6-3, and in the queries that follow the creation statements, you ll see the following headings: Initial extent: This storage parameter determines the initial amount of space that is allocated to any object you create in this tablespace. For example, if you specify a UNIFORM extent size of 10MB and specify an INITIAL_EXTENT value of 20MB, Oracle will create two 10MB-sized extents, to start with, for a new object. The example in Listing 6-1 shows an initial extent size of 5,242,880 bytes, based on the UNIFORM SIZE value, which is 5MB for this tablespace. Next extent: The NEXT_EXTENT storage parameter determines the size of the subsequent extents after the initial extent is created. Extent management: This column can show a value of LOCAL or DICTIONARY, for locally managed and dictionary-managed tablespaces, respectively. Allocation type: This column refers to the extent allocation, which can have a value of UNIFORM for uniform extent allocation, or SYSTEM for the AUTOALLOCATE option for sizing extents. Segment space management: This column shows the segment space management for the tablespace, which can be AUTO (the default) or MANUAL. Listing 6-1. Creating a Tablespace with Uniform Extents Using the UNIFORM SIZE Clause SQL> CREATE TABLESPACE test01 DATAFILE '/pasx02/oradata/pasx/test01_01.dbf' SIZE 100M UNIFORM SIZE 5M; Tablespace created. SQL> SQL> SELECT initial_extent,next_extent, extent_management, allocation_type,segment_space_management FROM dba_tablespaces; INITIAL_EXTENT -------------5242880 SQL> NEXT_EXTENT ----------5242880 EXTENT_MAN ---------LOCAL ALLOCATION_TYPE --------------UNIFORM SEGMENT_MAN -----------AUTO
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If you choose to use the UNIFORM option for extent allocation but don t specify the additional SIZE clause, Oracle will create uniform extents of size 1MB by default, as shown in Listing 6-2. Listing 6-2. Creating a Tablespace with Uniform Extents SQL> CREATE TABLESPACE test01 DATAFILE '/u09/oradata/test/test01.dbf' SIZE 100M UNIFORM;
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Tablespace created. SQL> SQL> SELECT initial_extent,next_extent, extent_management,allocation_type,segment_space_management FROM dba_tablespaces; INITIAL_EXTENT -------------1048576 SQL> NEXT_EXTENT ----------1048576 EXTENT_MAN ---------LOCAL ALLOCATION_TYPE --------------UNIFORM SEGMENT_MAN -----------AUTO
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If you choose the AUTOALLOCATE method of sizing extents, Oracle will size the extents starting with a 64KB (65536 bytes) minimum extent size. Note that you can specify the autoallocate method for extent sizing either by explicitly specifying it with the AUTOALLOCATE keyword, or by simply leaving out the keyword altogether, since by default, Oracle uses the AUTOALLOCATE method anyway. Listing 6-3 shows an example that creates a tablespace with system-managed (automatically allocated) extents. Listing 6-3. Creating a Tablespace with Automatically Allocated Extents SQL> CREATE TABLESPACE test01 DATAFILE '/pasx02/oradata/pasx/test01_01.dbf' SIZE 100M; Tablespace created. SQL> SQL> SELECT initial_extent,next_extent, extent_management,allocation_type,segment_space_management FROM dba_tablespaces; INITIAL_EXTENT -------------65536 SQL> NEXT_EXTENT ----------EXTENT_MAN ---------LOCAL ALLOCATION_TYPE --------------SYSTEM SEGMENT_MAN ---------AUTO
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Note that there is no value for the autoallocated tablespace for NEXT_EXTENT in Listing 6-3. When you choose the AUTOALLOCATE option (here it is chosen by default) rather than UNIFORM, Oracle allocates extent sizes starting with 64KB for the first extent. The next extent size will depend entirely upon the requirements of the segment (table, index, etc.) that you create in this tablespace.
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You create tablespaces so that you can create various types of objects, such as tables and indexes, in them. When you create a new table or index segment, Oracle will use certain storage parameters to allocate the initial space and to alter allocations of space as the object grows in size. You can omit the specification of storage parameters, such as INITIAL, NEXT, MINEXTENTS, MAXEXTENTS, and PCTINCREASE, when you create objects like tables and indexes in the tablespaces. For locally managed tablespaces, Oracle will manage the storage extents, so there is very little for you to specify in terms of storage allocation parameters. Oracle retains the storage parameters for backward compatibility only. You don t have to set the PCTUSED parameter if you re using locally managed tablespaces. If you set it, your object creation statement won t error out, but Oracle ignores the parameter. However, you can use the PCTFREE parameter to specify how much free space Oracle should leave in each block for future updates to data. The default is 10, which is okay if you don t expect the existing rows to get longer with time. If you do, you can change the PCTFREE parameter upward, say to 20 or 30 percent.
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