You can take an online tablespace offline so that it is temporarily unavailable for general use. The rest of the database remains open and available for users to access data. Conversely, you can bring an offline tablespace online to make the schema objects within the tablespace available to database users. The database must be open to alter the availability of a tablespace.
To alter the availability of a tablespace, use the ALTER TABLESPACE statement. You must have the ALTER TABLESPACE or MANAGE TABLESPACE system privilege.
Taking Tablespaces Offline
You may want to take a tablespace offline for any of the following reasons:
When a tablespace is taken offline, the database takes all the associated files offline.
You cannot take the following tablespaces offline:
Before taking a tablespace offline, consider altering the tablespace allocation of any users who have been assigned the tablespace as a default tablespace. Doing so is advisable because those users will not be able to access objects in the tablespace while it is offline.
You can specify any of the following parameters as part of the ALTER TABLESPACE ... OFFLINE statement:
Specify TEMPORARY only when you cannot take the tablespace offline normally. In this case, only the files taken offline because of errors need to be recovered before the tablespace can be brought online. Specify IMMEDIATE only after trying both the normal and temporary settings.
The following example takes the users tablespace offline normally:ALTER TABLESPACE users OFFLINE NORMAL;
Bringing Tablespaces Online
You can bring any tablespace in an Oracle Database online whenever the database is open. A tablespace is normally online so that the data contained within it is available to database users.
If a tablespace to be brought online was not taken offline "cleanly" (that is, using the NORMAL clause of the ALTER TABLESPACE OFFLINE statement), you must first perform media recovery on the tablespace before bringing it online. Otherwise, the database returns an error and the tablespace remains offline.
The following statement brings the users tablespace online:ALTER TABLESPACE users ONLINE;
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