Oracle 12c Tablespace Groups

Oracle Tablespace Groups Version 12.1.0.2

General Information

Library Note

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The Library is currently in the process of being upgraded from Oracle Database Version 11.2.0.3 to 12.1.0.1. Demos are being upgraded to reflect the new Container paradigm as well as EBR (Edition Based Redefinition) and may contain references to CDBs, PDBs, and other objects you may not be familiar with such as CDB_OBJECTS_AE: Welcome to 12c.

A tablespace group enables a user to consume temporary space from multiple tablespaces. A tablespace group has the following characteristics:

It contains at least one tablespace. There is no explicit limit on the maximum number of tablespaces that are contained in a group.
It shares the namespace of tablespaces, so its name cannot be the same as any tablespace.

You can specify a tablespace group name wherever a tablespace name would appear when you assign a default temporary tablespace for the database or a temporary tablespace for a user.

You do not explicitly create a tablespace group. Rather, it is created implicitly when you assign the first temporary tablespace to the group. The group is deleted when the last temporary tablespace it contains is removed from it.

Using a tablespace group, rather than a single temporary tablespace, can alleviate problems caused where one tablespace is inadequate to hold the results of a sort, particularly on a table that has many partitions. A tablespace group enables parallel execution servers in a single parallel operation to use multiple temporary tablespaces.

Data Dictionary Objects

CDB_TABLESPACE_GROUPS

DBA_TABLESPACE_GROUPS

TS$

System Privileges

ALTER TABLESPACE	DROP TABLESPACE	UNLIMITED TABLESPACE
CREATE TABLESPACE	MANAGE TABLESPACE

Create Tablespace Group

With Create Tablespace

CREATE TEMPORARY TABLESPACE <tablespace_name>
TEMP <data_file_path_and_name>
SIZE <integer> <K | M | G | T | P | E>
TABLESPACE GROUP <group_name>;

CREATE TEMPORARY TABLESPACE batchtemp
TEMPFILE '/u02/oradata/temp04.dbf'
SIZE 2E
TABLESPACE GROUP temp_grp;

desc dba_tablespace_groups

SELECT *
FROM dba_tablespace_groups;

With Alter Tablespace

ALTER TABLESPACE <tablespace_name>
TABLESPACE GROUP <group_name>;

ALTER TABLESPACE tools TABLESPACE GROUP apps_grp;

SELECT *
FROM dba_tablespace_groups;

Remove A Group Member

Remove Tablespace from Group

ALTER TABLESPACE <tablespace_name> TABLESPACE GROUP '';

ALTER TABLESPACE batchtemp TABLESPACE GROUP '';

SELECT *
FROM dba_tablespace_groups;

Default Temporary Tablespace Assignment

Make a Group the Default Group

ALTER DATABASE <tablespace_name>
DEFAULT TEMPORARY TABLESPACE <group_name>;

ALTER DATABASE orabase DEFAULT TEMPORARY TABLESPACE app_grp;

SELECT *
FROM dba_tablespace_groups;