| General |
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 Object |
| ts$ |
dba_tablespace_groups |
|
| |
| Group
Creation |
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; |
