Oracle表空间大小如何查看及扩增

SELECT tablespace_name, 
       ROUND(SUM(bytes) / 1024 / 1024, 2) AS "Total Size (MB)",
       ROUND(SUM(maxbytes) / 1024 / 1024, 2) AS "Max Size (MB)",
       ROUND(SUM(user_bytes) / 1024 / 1024, 2) AS "Used Size (MB)",
       ROUND(SUM(bytes - user_bytes) / 1024 / 1024, 2) AS "Free Space (MB)"
FROM dba_data_files
GROUP BY tablespace_name;

SELECT 
    file_name, tablespace_name, bytes
FROM
    DBA_DATA_FILES
ORDER BY tablespace_name , file_name;

ALTER DATABASE DATAFILE 'path_to_datafile' RESIZE size_in_megabytes;

ALTER TABLESPACE tablespace_name AUTOEXTEND ON NEXT size_in_megabytes MAXSIZE max_size_in_megabytes;

ALTER TABLESPACE tablespace_name ADD DATAFILE 'new_datafile_path' SIZE size_in_megabytes;