After Oracle is installed, there is a default database. In addition to this default database, we can also create our own database. For beginners, you can use the 'database Configuration asmap' Wizard to create a Database to avoid troubles. After creating a database, you cannot create tables in the database immediately. You must first create a user for the database and specify a tablespace for the user. The specific process for creating database users is as follows: 1. if a database named 'News' has been created, the news directory already exists in the F: \ oracle \ product \ 10.1.0 \ oradata \ directory (Note: My Oracle10g is installed in F: \ oracle, if your Oracle is installed in another directory, the new database directory will be under * \ product \ 10.1.0 \ oradata ). 2. before creating a user, create a tablespace in the format of: Format: create tablespace table name datafile 'data filename 'size tablespace size; for example: SQL> create tablespace news_tablespace datafile 'f: \ oracle \ product \ 10.1.0 \ oradata \ news \ news_data.dbf 'size 500 M; 'news _ tablespace 'is your custom tablespace name, you can name it at will. 'f: \ oracle \ product \ 10.1.0 \ oradata \ news \ news_data.dbf' is the storage location of the data file, 'news _ data. dbf' the file name is also arbitrary; 'size m' specifies the size of the data file, that is, the tablespace size. 3. now we have created a tablespace named 'news _ tablespace '. Now we can create a user in the format of: create user username identified by password default tablespace table; for example: SQL> create user news identified by news default tablespace news_tablespace; default tablespace 'default tablespace' uses the tablespace created above. 4. then authorize the new user: SQL> grant connect, resource to news; -- grant the connect and resource permissions to the news user SQL> grant dba to news; -- indicates that the dba permission is successfully granted to the news user. OK! The database user has been created. Now you can use this user to create a data table!