Creating Tablespaces in Oracle ASM: Specifying Attributes with Templates
Use the SQL ALTERSYSTEM and CREATETABLESPACE statements to create a tablespace that uses a user-defined template to specify the attributes of the data file.
Example 5-18 assumes that the template (mytemplate) has been defined.
Example 5-18 Using a user-defined template to specify attributes
ALTER SYSTEM SET DB_CREATE_FILE_DEST = '+data(mytemplate)';
CREATE TABLESPACE mytblspace;