What is USERS01 dbf?

USERS01.DBF. Stores database objects created by database users.

How do I reduce the size of my datafile?

Online shrink of objects towards the end of the datafile may allow you to reduce the datafile size. Move the SYSAUX objects with extents towards the end of the datafile to a temporary tablespace, reduce the datafile size and move them back.

How do I shrink a dbf file in Oracle?

The basic syntax for this command is: Alter database name datafile ‘file_name’ resize size; Where name is the name of the database, file_name is the name of the file and size is the new size to make this file. We can see this size change in the dba_data_files table as well as from the server.

How do you reduce tablespace?

You can use any of the following options:

  1. ALTER TABLESPACE statement with a REDUCE option. Reduces the Pending free extent.
  2. ALTER TABLESPACE statement with a REDUCE option (with size specified) Reduces pending free extents and other free extents by a specified size.
  3. ALTER TABLESPACE statement with REDUCE MAX option.

What is .DBF file in Oracle?

dbf” file extension for Oracle datafiles to signify that this datafile is a database file, or dbf. But you can use anything you want. The Oracle database does not dictate the file extension. It is just a common practice to use this file extension.

How do I view a DBF file?

How to Open DBF Files

  1. dBASE is the primary program used to open DBF files.
  2. GTK DBF Editor is one free DBF opener for macOS and Linux, but NeoOffice (for Mac), multisoft FlagShip (Linux), and OpenOffice work as well.
  3. Xbase mode can be used with Emacs to read xBase files.

How do I resize a temp file?

Tempfile resize

  1. Create another temp Tablespace=0D.
  2. Make this as the default temp Tablespace for the database=0D.
  3. Move all the current users to this Tablespace=0D.
  4. Drop the original TEMP Tablespace and recreate it and then move all.

What is using Sysaux?

You can use the SYSAUX tablespace to perform the following tasks: Avoid SYSTEM tablespace fragmentation caused by install and deinstall options. Avoid risking SYSTEM tablespace corruption and out-of-space situations. Reduce maintenance for the database administrator.

How do I reduce the size of my Oracle database?


  1. If your tablespace used size is pretty less than allocated size then you can resize the datafile.
  2. Create retention policy for your application tables then you can delete rows from the table / drop partition. After delete you need to move the tables and rebuild the indexes.
  3. Decrease your temp / undo tablespace.

How do I reduce undo tablespace usage?


  1. To resize an UNDO tablespace run these commands on the database server as user virtuo :
  2. Check if enough free disk space exists on the disk where the UNDOTBS file(s) are placed.
  3. If new files have to be added to the UNDO tablespace run the command:
  4. Check the current size of the UNDO tablespace:

Can we delete .dbf file in Oracle?

You can manually delete it using Windows, or you can simply use: CREATE SMALLFILE TABLESPACE dev_01 DATAFILE ‘C:\Oradata\db1\devdata\dev_01. dbf’ SIZE 500M REUSE; This will reuse the existing file if it exists.