[Oracle DataBase Server 12.2 Installation on Oracle Linux 7.4]: Extending Tablespaces (Creating Additional Files for Tablespaces)

$ sqlplus / as sysdba

View which database files are used by the database and where they are located:

SQL> set linesize 200;
SQL> set pagesize 0;
SQL> col name format a40;
SQL> SELECT file#, name, status
FROM v$datafile;

1) Creating a new tablespace for indexes and data:

SQL> CREATE TABLESPACE "MY_DATA"
DATAFILE '/u02/oracle/oradata/12.2/orcl12/DATAFILE/data/my_data01.dbf' SIZE 2G AUTOEXTEND OFF;

If necessary, you can add additional space for data (when such a need arises) with the following commands:

SQL> ALTER TABLESPACE "MY_DATA"
ADD DATAFILE  '/u02/oracle/oradata/12.2/orcl12/DATAFILE/data/my_data02.dbf' SIZE 2G AUTOEXTEND OFF;

SQL> CREATE TABLESPACE "MY_INDEXES"
DATAFILE '/u02/oracle/oradata/12.2/orcl12/DATAFILE/indexes/my_indexes01.dbf' SIZE 2G AUTOEXTEND OFF;

If necessary, you can add additional space for indexes (when such a need arises) with the following commands:

SQL> ALTER TABLESPACE "MY_INDEXES"
ADD DATAFILE  '/u02/oracle/oradata/12.2/orcl12/DATAFILE/indexes/my_indexes02.dbf' SIZE 2G AUTOEXTEND OFF;

2) Sometimes you need to create an additional undo tablespace.

SQL> CREATE undo tablespace "UNDO" datafile '/u02/oracle/oradata/12.2/orcl12/DATAFILE/undo/undo01.dbf' size 1G autoextend off;

Set the created tablespace as the default tablespace

SQL> ALTER SYSTEM SET UNDO_TABLESPACE = "UNDO";

Delete the old tablespace

SQL> drop tablespace UNDOTBS1;

3) Create a new temporary tablespace.

SQL> CREATE TEMPORARY TABLESPACE "MY_TEMP"
TEMPFILE '/u02/oracle/oradata/12.2/orcl12/DATAFILE/temp/my_temp01.dbf' SIZE 2G AUTOEXTEND OFF;

Add an additional file for temporary tablespaces.

SQL> ALTER TABLESPACE "MY_TEMP"
ADD TEMPFILE '/u02/oracle/oradata/12.2/orcl12/DATAFILE/temp/my_temp02.dbf' SIZE 2G AUTOEXTEND OFF;

SQL> quit