What is the purpose of Oracle temporary tablespace?

Oracle temporary tablespace is used to store temporary data during operations like querying, sorting, joining, grouping, and other processes that require temporary storage.

The functions of temporary tablespace include:

1. Temporary data storage: During the execution of complex queries, it is necessary to temporarily store intermediate results such as sorting results and joining results. Temporary tablespace provides space for storing temporary data, ensuring the smooth progress of query operations.
2. Temporary table storage: Some query operations may require creating temporary tables to store intermediate results. Temporary table space provides the space for storing these temporary tables.
3. Transaction rollback: In a database, when executing transaction operations, if an error occurs or a rollback is needed, the database will use temporary table space to store rollback segments for undoing the transaction.

In short, temporary tablespace in Oracle database acts as a storage for temporary data and temporary tables, ensuring smooth query operations and supporting transaction rollbacks.