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CHAPTER 6 MA NAGING TA BLESPA CES
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ALTER TABLESPACE test01 RENAME DATAFILE '/u01/app/oracle/test01.dbf' TO '/u02/app/oracle/test01.dbf';
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Tablespace altered. SQL>
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By default, all Oracle tablespaces are both readable and writable when created. However, you can specify that a tablespace cannot be written to by making it a read-only tablespace. The command to do so is simple: SQL> ALTER TABLESPACE test01 READ ONLY; If you want to make this read-only tablespace writable again, you can use the following command: SQL> ALTER TABLESPACE test01 READ WRITE;
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Except for the System tablespace, you can take any or all of the tablespaces offline that is, you can make them temporarily unavailable to users. You usually need to take tablespaces offline when a datafile within a tablespace contains errors or you are changing code in an application that accesses one of the tablespaces being taken offline. Four modes of offlining are possible with Oracle tablespaces: normal, temporary, immediate, and for recovery. Except for the normal mode, which is the default mode of taking tablespaces offline, all the other modes can involve recovery of the included datafiles or the tablespace itself. You can take any tablespace offline with no harm by using the following command: SQL> ALTER TABLESPACE index_01 OFFLINE NORMAL; Oracle will ensure the checkpointing of all the datafiles in the tablespace (index_01 in this example) before it takes the tablespace offline. Thus, there is no need for recovery when you later bring the tablespace back online. To bring the tablespace online, use the following command: SQL> ALTER TABLESPACE index_01 ONLINE;
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A temporary tablespace, contrary to what the name might indicate, does exist on a permanent basis as do other tablespaces, such as the System and Sysaux tablespaces. However, the data in a temporary tablespace is of a temporary nature, which persists only for the length of a user session. Oracle uses temporary tablespaces as work areas for tasks such as sort operations for users and sorting during index creation. Oracle doesn t allow users to create objects in a temporary tablespace. By definition, the temporary tablespace holds data only for the duration of a user s session, and the data can be shared by all users. The performance of temporary tablespaces is extremely critical when your application uses sort- and hash-intensive queries, which need to store transient data in the temporary tablespace.
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CHAPTER 6 MA NAGING TA BLESPA CES
Note
Oracle writes data in the program global area (PGA) in 64KB chunks. Therefore, Oracle advises you to create temporary tablespaces with extent sizes that are multiples of 64KB. For large data warehousing and decision-support system databases, which make extensive use of temporary tablespaces, the recommended extent size is 1MB.
The very first statement after starting up an instance that uses the temporary tablespace creates a sort segment, which is shared by all sort operations in the instance. When you shut down the database, the database releases this sort segment. You can query the V$SORT_SEGMENT view to review the allocation and deallocation of space to this sort segment. You can see who s currently using the sort segment by querying the V$SORT_USAGE view. Use the V$TEMPFILE and DBA_TEMP_FILES views to find out details about the tempfiles currently allocated to a temporary tablespace. As mentioned earlier, you must use the TEMPFILE clause when specifying the files that are part of any temporary tablespace. There is really no difference, as far as you are concerned, between a DATAFILE clause that you specify for permanent tablespaces and the TEMPFILE clause you specify for temporary tablespaces. However, Oracle distinguishes between the two types of files. Tempfiles have little or no redo data associated with them.
Creating a Temporary Tablespace
You create a temporary tablespace the same way as you do a permanent tablespace, with the difference being that you specify the TEMPORARY clause in the CREATE TABLESPACE statement and substitute the TEMPFILE clause for the DATAFILE clause. Here s an example: SQL> CREATE TEMPORARY TABLESPACE temp_demo TEMPFILE 'temp01.dbf' SIZE 500M AUTOEXTEND ON; The SIZE clause in the second line specifies the size of the datafile and hence the size of the temporary tablespace, as 500MB. In the preceding statement, the AUTOEXTEND ON clause will automatically extend the size of the temporary file, and thus the size of the temporary tablespace. By default, all temporary tablespaces are created with uniformly sized extents, with each extent sized at 1MB. You can, however, specify the UNIFORM SIZE clause to specify a nondefault extent size, as shown in the following statement: SQL> CREATE TEMPORARY TABLESPACE temp_demo TEMPFILE 'temp01.dbf' SIZE 500M EXTENT MANAGEMENT LOCAL UNIFORM SIZE 16M; In the previous statement, the EXTENT MANAGEMENT clause is optional. The UNIFORM SIZE clause specifies a custom extent size of 16MB instead of the default extent size of 1MB.
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