数据库

查看表空间使用情况

select upper(f.tablespace_name) "表空间名",
       d.tot_grootte_mb "表空间大小(m)",
       d.tot_grootte_mb - f.total_bytes "已使用空间(m)",
       to_char(round((d.tot_grootte_mb - f.total_bytes) / d.tot_grootte_mb * 100,
                     2),
               '990.99') "使用比",
       f.total_bytes "空闲空间(m)",
       f.max_bytes "最大块(m)"
  from (select tablespace_name,
               round(sum(bytes) / (1024 * 1024), 2) total_bytes,
               round(max(bytes) / (1024 * 1024), 2) max_bytes
          from sys.dba_free_space
         group by tablespace_name) f,
       (select dd.tablespace_name,
               round(sum(dd.bytes) / (1024 * 1024), 2) tot_grootte_mb
          from sys.dba_data_files dd
         group by dd.tablespace_name) d
 where d.tablespace_name = f.tablespace_name
 order by 4 desc;

查看表空间中每个表的大小

select segment_name, isize || 'M'
  from (select segment_name, sum(bytes) / 1024 / 1024 isize
          from dba_segments
         where tablespace_name = 'SNBST_HIST'
           AND segment_type = 'TABLE'
         GROUP BY segment_name)
 order by isize desc;

查看表空间文件使用大小

SELECT B.TABLESPACE_NAME 表空间,
       B.FILE_NAME 物理文件名,
       B.BYTES / 1024 / 1024 大小M,
       (B.BYTES - SUM(NVL(A.BYTES, 0))) / 1024 / 1024 已使用M,
       SUBSTR((B.BYTES - SUM(NVL(A.BYTES, 0))) / (B.BYTES) * 100, 1, 5) 利用率
  FROM DBA_FREE_SPACE A, DBA_DATA_FILES B
 WHERE A.FILE_ID = B.FILE_ID
 GROUP BY B.TABLESPACE_NAME, B.FILE_NAME, B.BYTES
 ORDER BY B.TABLESPACE_NAME;