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Here are some ways to create additional room in an Oracle Tablespace for Users:

1. Add data files: To create more space for users, you can add additional data files to the tablespace. Data files can be added using the ALTER TABLESPACE command.

2. Resize data files: You can also resize existing data files to make room for more data using the ALTER DATABASE command.

3. Move tables: Another way to free up space is to move tables to another tablespace. You can use the ALTER TABLE command to move a table from one tablespace to another.

4. Purge old data: If there are old or unnecessary data in the tablespace, you can delete them to make more room. Use the DELETE command carefully to avoid accidentally deleting important data.

5. Enable compression: You can compress tables and indexes to save space. Oracle provides compression features like BASIC, OLTP, and QUERY HIGH.

6. Partitioning: If the table is large, you can consider partitioning the data. Partitioning allows you to split data into smaller, more manageable pieces. This can speed up queries and make maintenance tasks easier.