(8) Managing Tablespaces and Data files

• 
  SQL> select * from v$tablespace;
  SQL> select * from v$datafile;
  SQL> select * from v$tempfile;
  SQL> select t1.name,t2.name from v$tablespace t1, v$datafile t2 where t1.ts#=t2.ts#;
  SQL > alter tablespace add datafile 'xxx' size 100m;
  (1) System tablespace
  (2) Non-System tablespace

• Create Tablespace
  SQL> create tablespace kong
            datafile 'xxx' size 100m
            extent management dictionary
            default storage(
              initial 100k
              next 100k
              pctincrease 10)
             offline;

             SQL> create tablespace kong
                       datafile 'xxx' size 100m
                       extent management local uniform size 256K(autoallocate);
                       autoextend on next 5M maxsize 200m(unlimited);
             (1) Locally Managed tablespaces  (推荐使用)
                      Free extends recorded in bitmap
                      Reduce contention on data dictionary table
                      No undo generated when space allocation
                      No coalescing required
             (2) Dictionary-managed tablespaces
                     Free extends recorded in data dictionary tables
                     Each segment stored in the tablespace can have different storage clause
                     coalescing required

• Undo Tablespace
  SQL> create undo tablespace undo1 datafile 'xxx' size 40m;
  SQL> show parameter undo_management;
• Temporary Tablespace
  Used for sort operations
  Cannot contain any permanent objects
  SQL> create temporary tablespace kong4
            tempfile='xxx' size 5m extent mangement local;
  SQL> alter database default temporary tablespace=kong4;
• Offline status
  SQL> alter tablespace userdata offline(online)
• Tablespace Read Only
  SQL> alter tablespace userdata read only;
  SQL> alter tablespace userdata rename 'xxx';
• Dropping Tablespace
  SQL> drop tablespace userdata including contents and datafiles;
• Resizing Tablespace
  (1) automatically      (AUTOEXTEND ON)
  (2) Manually            SQL> alter database datafile 'xxx' resize 200m;
  (3) add file               SQL> alter tablespace kong add datafile 'xxx' size 100m;
• Moving Data Files    SQL> alter tablespace userdata rename 'xxx' to 'xxx1'