Database properties views

Below are some query that will help you to check current database properties:

SQL>SELECT * FROM DATABASE_PROPERTIES;

SQL> SELECT  * FROM DATABASE_SUMMARY;

If you want the full version information for your DB then:

SQL>SELECT * FROM v$version;

If you want your DB parameters then:

SQL>SELECT * FROM v$parameter;

If you want more information about your DB instance then:

SQL>SELECT * FROM v$database;

SQL>SELECT * FROM v$instance;

If you want the "size" of your database then this will give you a close enough calculation:

SQL>SELECT SUM(bytes / (1024*1024)) "DB Size in MB" FROM dba_data_files;