SELECT df.tablespace_name, df.file_id, df.file_name, df.AUTOEXTENSIBLE, df.bytes / 1024 / 1024 / 1024 AS current_size_gb, e.max_block * 8192 /1024/ 1024 / 1024 AS current_used_gb, -- 实际用到的位置 ROUND((df.bytes - e.max_block * 8192) / 1024 / 1024 / 1024, 2) AS can_shrink_gb, -- 建议收缩到大小实际使用 1G 安全余量 CEIL(e.max_block * 8192 /1024 / 1024 / 1024) 1 AS resize_to_gb, alter database datafile ||df.FILE_NAME|| resize ||(CEIL(e.max_block * 8 / 1024 / 1024) 1) || G; as ddl_resize FROM dba_data_files df, ( SELECT file_id, MAX(block_id blocks - 1) max_block FROM dba_extents GROUP BY file_id ) e WHERE 11 and df.file_id e.file_id and df.tablespace_name NOT IN (SYSTEM,SYSAUX,UNDOTBS1) ORDER BY can_shrink_gb DESC;收缩前需要检查下回收站select a.* from dba_recyclebin a where 11 ;select PURGE TABLE ||a.owner||.||a.object_name||; as ddl_purge, a.* from dba_recyclebin a where 11 and a.typeTABLE order by a.owner,a.original_name ;