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Sometimes you may want to get rid of a tablespace. You can remove a tablespace from the database by issuing this simple command: SQL> DROP TABLESPACE test01; If the test01 tablespace includes tables or indexes when you issue a DROP TABLESPACE command, you ll get an error. You can either move the objects to a different tablespace or, if the objects are dispensable, you can use the following command, which will drop the tablespace and all the objects that are part of the tablespace: SQL> DROP TABLESPACE test01 INCLUDING CONTENTS;
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Caution
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In Oracle Database 10g, database objects such as tables aren t dropped right away when you issue a
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DROP TABLE command. Instead, they go to the Recycle Bin (discussed in 16), from which you can reclaim
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the table you dropped. When you use the DROP TABLESPACE . . . INCLUDING CONTENTS command, the objects in the tablespace are dropped right away, bypassing the Recycle Bin! Any objects belonging to this tablespace that are in the Recycle Bin are also purged permanently when you issue this command. If you omit the INCLUDING CONTENTS clause and the tablespace contains objects, the statement will fail, but any objects in the Recycle Bin will be dropped.
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The DROP TABLESPACE . . . INCLUDING CONTENTS statement will not release the datafiles back to the operating system s file system. To do so, you have to either manually remove the datafiles that
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CHAPTER 6 MA NAGING TA BLESPA CES
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were a part of the tablespace or issue the following command to remove both the objects and the physical datafiles at once: SQL> DROP TABLESPACE test01 INCLUDING CONTENTS AND DATAFILES; The preceding statement will automatically drop the datafiles along with the tablespace. If there are referential integrity constraints in other tables that refer to the tables in the tablespace you intend to drop, you need to use the following command: SQL> DROP TABLESPACE test01 CASCADE CONSTRAINTS; The one tablespace you can t drop, of course, is the System tablespace. You also can t drop the Sysaux tablespace during normal database operation. However, provided you have the SYSDBA privilege and you have started the database in the MIGRATE mode, you ll be able to drop the Sysaux tablespace. Of course, there aren t many reasons why you would want to drop your Sysaux tablespace. If you simply want to move certain users out of this tablespace, you can always use the appropriate move procedure specified in the V$SYSAUX_OCCUPANTS view. The V$SYSAUX_OCCUPANTS view shows you details about the space usage by each occupant of the Sysaux tablespace. It also provides you with the move procedure to use for a given occupant, if you want to move the occupant to a different tablespace. Here s a sample query using this view: SQL> SELECT occupant_name, schema_name, space_usage_kbytes, 2* move_procedureFROM V$SYSAUX_OCCUPANTS; OCCUPANT_NAME SCHEMA_NAME ----------------------LOGMNR SYSTEM . . . ULTRASEARCH WKSYS 20 rows selected. SQL> SPACE_USG_KB -----------7488 7296 MOVE_WK MOVE_PROCEDURE -------------------------------SYS.DBMS_LOGMNR_D.SET_TABLESPACE
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If you wish to move the Sysaux occupant ULTRASEARCH to a new tablespace called ULTRA1, you can do so using the MOVE_WK procedure owned by the WKSYS schema, as shown here: SQL> EXECUTE WKSYS.MOVE_WK('ULTRA1'); This section introduced you to several useful data dictionary views that help you manage the database. Although using the OEM Database Control reduces the need to use most of these views on a frequent basis, it s important to master the contents of these views, so you know where the database stores important information.
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Number of User Tablespaces
Oracle DBAs have traditionally used a large number of tablespaces for managing database objects. Unfortunately, the larger the number of tablespaces in your database, the more time you ll have to spend on mundane tasks, such as monitoring space and allocating space to the tablespaces. Disk contention between indexes and tables and other objects were pointed out as the reason for creating large numbers of tablespaces, but with the types of disk management used today in most places, where Logical Volume Managers stripe operating system files over several disk spindles, traditional tablespace-creation rules don t apply. You re better off using a very small number of tablespaces perhaps just four or five to hold all your data.
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