【Oracle】查看表/临时表空间

SELECT
    a.tablespace_name "表空间名",
    total "表空间大小",
    free "表空间剩余大小",
    ( total - free ) "表空间使用大小",
    total / ( 1024 * 1024 * 1024 ) "表空间大小(G)",
    free / ( 1024 * 1024 * 1024 ) "表空间剩余大小(G)",
    ( total - free ) / ( 1024 * 1024 * 1024 ) "表空间使用大小(G)",
    round(( total - free ) / total, 4 ) * 100 "使用率 %" 
FROM
    (
    SELECT tablespace_name, SUM( bytes ) free FROM dba_free_space GROUP BY tablespace_name 
    UNION ALL
    SELECT tablespace_name, SUM( bytes_cached ) free FROM v$temp_extent_pool GROUP BY tablespace_name 
    ) a,
    (
    SELECT tablespace_name, SUM( bytes ) total FROM dba_data_files GROUP BY tablespace_name 
    UNION ALL
    SELECT tablespace_name, SUM( bytes ) total FROM dba_temp_files GROUP BY tablespace_name 
    ) b 
WHERE
    a.tablespace_name = b.tablespace_name;

参考文章：https://www.cnblogs.com/ViokingJava/p/8185022.html

                  https://www.cnblogs.com/superming/p/11057196.html