1. 查看表空間是否自增長

　　SELECT FILE_NAME, TABLESPACE_NAME, AUTOEXTENSIBLE FROM DBA_DATA_FILES;

　　2. 查看表空間大小

　　select tablespace_name, sum(bytes) / 1024 / 1024 as MB from dba_data_files group by tablesp

　　3. 查看表空間使用情況

　　select tablespace_name,count(*) as extends,round(sum(bytes) / 1024 / 1024, 2) as MB,sum(blocks) as blocks from dba_free_space group by tablespace_name;

　　4. 查看當前用戶默認表空間

　　select username,default_tablespace from user_users;