What is the use of temporary tablespace in Oracle?
Temporary tablespaces are used for storing temporary data, as would be created when SQL statements perform sort operations. An Oracle database gets a temporary tablespace when the database is created. You would create another temporary tablespace if you were creating a temporary tablespace group.
What is permanent tablespace?
A permanent tablespace contains persistent schema objects. Objects in permanent tablespaces are stored in datafiles. An undo tablespace is a type of permanent tablespace used by Oracle Database to manage undo data if you are running your database in automatic undo management mode.
How do I create a temporary tablespace?
To create a tablespace to contain persistent schema objects, use the CREATE TABLESPACE statement. To create a temporary tablespace that is dictionary managed, use the CREATE TABLESPACE statement with the TEMPORARY clause. Note: Media recovery does not recognize tempfiles.
Do you think temporary tablespaces are useful?
Temporary tablespaces are used to manage space for database sort and joining operations and for storing global temporary tables. For joining two large tables or sorting a bigger result set, Oracle cannot do in memory by using SORT_AREA_SIZE in PGA (Programmable Global Area).
Can we rename tablespace in Oracle?
Using the RENAME TO clause of the ALTER TABLESPACE , you can rename a permanent or temporary tablespace. For example, the following statement renames the users tablespace: If the tablespace being renamed is the SYSTEM tablespace or the SYSAUX tablespace, then it will not be renamed and an error is raised.
Can we rename tablespace name in Oracle?
Rename Tablespace Renaming permanent and temporary tablespaces is now allowed in Oracle 10g (except for SYSTEM and SYSAUX) using the following command. The tablespace and all it’s datafiles must be online and the database must have a COMPATIBLE setting of 10.0. 0 or greater.
How do I reclaim free space in Oracle?
Here are the high-level steps that will be performed.
- Create an ASM Disk Group using the ASM Filter Driver.
- Create a tablespace in this diskgroup and populate it with some random data.
- Check the space allocated at the database and array level.
- Drop the tablespace and run ASM rebalance.
- Check the space again.
Who is using temporary tablespace in Oracle?
Temporary tablespaces are used to manage space for database sort operations and for storing global temporary tables. For example, if you join two large tables, and Oracle cannot do the sort in memory, space will be allocated in a temporary tablespace for doing the sort operation.