Oracle查看表空间使用情况

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SELECT a.tablespace_name,
       total,
       free,
       total / (1024 * 1024 * 1024) "total",
       free / (1024 * 1024 * 1024) "free"
  FROM (SELECT tablespace_name, SUM(bytes) free
          FROM dba_free_space
         GROUP BY tablespace_name) a,
       (SELECT tablespace_name, SUM(bytes) total
          FROM dba_data_files
         GROUP BY tablespace_name) b
 WHERE a.tablespace_name = b.tablespace_name;

--利用truncate table demo_user; 方式才能真正释放表空间