Select the tablespace for maintaining in the object pane. Right-click and select the Maintain from the popup menu.
[Read Only]
To place the tablespace in transition read-only mode. In this state, existing transactions can complete (commit or roll back), but no further DML operations are allowed to the tablespace except for rollback of existing transactions that previously modified blocks in the tablespace.
Read Write
To indicate that write operations are allowed on a previously read-only tablespace.
Online
To take the tablespace online.
Offline
To take the tablespace offline.
Normal
To flush all blocks in all datafiles in the tablespace out of the system global area (SGA).Temporary
Oracle Database performs a checkpoint for all online datafiles in the tablespace but does not ensure that all files can be written.Immediate
Oracle Database does not ensure that tablespace files are available and does not perform a checkpoint.
Coalesce
To combine all contiguous free extents into larger contiguous extents for each datafile in the tablespace.
Shrink Space
To reduce the amount of space the tablespace is taking. This is valid only for temporary tablespaces in Oracle 11g.