最近使用oracle 导入数据 遇到表空间的各种问题，从网上搜罗了一些sql,以供不时只需

--查询表空间信息
SELECT a.tablespace_name,a.bytes / 1024 / 1024                              "表空间大小(M)",( a.bytes - b.bytes ) / 1024 / 1024                "已使用空间(M)",b.bytes / 1024 / 1024                              "空闲空间(M)",Round(( ( a.bytes - b.bytes ) / a.bytes ) * 100,2) "使用比率"
FROM  (SELECT tablespace_name,SUM(bytes) bytes
        FROM  dba_data_files
        GROUP  BY tablespace_name) a,(SELECT tablespace_name,SUM(bytes) bytes,Max(bytes) largest
        FROM  dba_free_space
        GROUP  BY tablespace_name) b
WHERE  a.tablespace_name = b.tablespace_name
ORDER  BY ( ( a.bytes - b.bytes ) / a.bytes ) DESC

--查看表空间对应的datafile的信息
SELECT file_name,tablespace_name,bytes / 1024 / 1024    "bytes MB",maxbytes / 1024 / 1024 "maxbytes MB"
FROM  dba_data_files
WHERE  tablespace_name = 'DJGL_DATA';

--查看表空间对应的datafile是否可以自动扩展
SELECT file_id,file_name,autoextensible,increment_by
FROM  dba_data_files
WHERE  tablespace_name = 'DJGL_DATA'
ORDER  BY file_id DESC;