12.2 New Features-Separate Undo Tablespace for each PDB
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SQL> select c.con_id, c.name con_name, t.tablespace_name, t.contents, t.status
from v$containers c, cdb_tablespaces t
where c.con_id=t.con_id
and t.tablespace_name like '%UNDO%'
order by 1,2; 2 3 4 5
CON_ID CON_NAMETABLESPACE_NAME CONTENTS STATUS
---------- -------------------- ------------------------------ --------------------- ---------
1 CDB$ROOTUNDOTBS1 UNDO ONLINE
3 ORCLPDB UNDOTBS1 UNDO ONLINE
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SQL> select c.con_id, c.name con_name, t.tablespace_name, t.contents, t.status
from v$containers c, cdb_tablespaces t
where c.con_id=t.con_id
and t.tablespace_name like '%UNDO%'
order by 1,2; 2 3 4 5
CON_ID CON_NAMETABLESPACE_NAME CONTENTS STATUS
---------- -------------------- ------------------------------ --------------------- ---------
1 CDB$ROOTUNDOTBS1 UNDO ONLINE
3 ORCLPDB UNDOTBS1 UNDO ONLINE
SQL> conn system/oracle@orclpdb
Connected.
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
temp_undo_enabled boolean FALSE
undo_management string AUTO
undo_retention integer 900
undo_tablespace string UNDOTBS1
SQL> select name from v$datafile;
NAME
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/orcl/orclpdb/system01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/sysaux01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/undotbs01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/users01.dbf
SQL> create undo tablespace undopdb1 datafile '/u01/app/oracle/oradata/orcl/orclpdb/undopdb1.dbf' size 2m;
SQL> alter system set undo_tablespace='undopdb1';
System altered.
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
temp_undo_enabled boolean FALSE
undo_management string AUTO
undo_retention integer 900
undo_tablespace string undopdb1
SQL> alter system set undo_tablespace='UNDOTBS1';
System altered.
SQL> drop tablespace undopdb1 including contents and datafiles;
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/orcl/orclpdb/system01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/sysaux01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/undotbs01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/users01.dbf
SQL> create undo tablespace undopdb1 datafile '/u01/app/oracle/oradata/orcl/orclpdb/undopdb1.dbf' size 2m;
SQL> alter system set undo_tablespace='undopdb1';
System altered.
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
temp_undo_enabled boolean FALSE
undo_management string AUTO
undo_retention integer 900
undo_tablespace string undopdb1
SQL> alter system set undo_tablespace='UNDOTBS1';
System altered.
SQL> drop tablespace undopdb1 including contents and datafiles;