oracle 查看表空间使用率

2017-06-14

Oracle 表空间使用率

-- 表空间使用率1：DBA_DATA_FILES、DBA_SEGMENTS
SELECT tablespace_name,
       ROUND(a.total_bytes / 1024 / 1024 / 1024, 0) || 'G' as TOTAL,
       ROUND((a.total_bytes - DECODE(b.used_bytes, null, 0, b.used_bytes)) / 1024 / 1024 / 1024,
             0) || 'G' as FREE,
       ROUND(DECODE(b.used_bytes, null, 0, b.used_bytes) / 1024 / 1024 / 1024,
             0) || 'G' as USED,
       ROUND(DECODE(b.used_bytes, null, 0, b.used_bytes) / a.total_bytes, 4) * 100 as "USED_RATIO(%)"
  FROM (SELECT tablespace_name,
               sum(DECODE(autoextensible, 'YES', maxbytes, 'NO', bytes)) as total_bytes
          FROM DBA_DATA_FILES
         GROUP BY tablespace_name) a
  LEFT JOIN (SELECT tablespace_name, sum(bytes) as used_bytes
               FROM DBA_SEGMENTS
              GROUP BY tablespace_name) b
 USING (tablespace_name)
 ORDER BY 5 DESC;

-- 表空间使用率2：DBA_DATA_FILES、DBA_EXTENTS
SELECT tablespace_name,
       ROUND(a.total_bytes / 1024 / 1024 / 1024, 0) || 'G' as total,
       ROUND((a.total_bytes - DECODE(b.used_bytes, null, 0, b.used_bytes)) / 1024 / 1024 / 1024,
             0) || 'G' as free,
       ROUND(DECODE(b.used_bytes, null, 0, b.used_bytes) / 1024 / 1024 / 1024,
             0) || 'G' as used,
       ROUND(DECODE(b.used_bytes, null, 0, b.used_bytes) / a.total_bytes, 4) * 100 as "USED_RATIO(%)"
  FROM (SELECT tablespace_name,
               sum(DECODE(autoextensible, 'YES', maxbytes, 'NO', bytes)) as total_bytes
          FROM DBA_DATA_FILES
         GROUP BY tablespace_name) a
  LEFT JOIN (SELECT tablespace_name, sum(bytes) as used_bytes
               FROM DBA_EXTENTS
              GROUP BY tablespace_name) b
 USING (tablespace_name)
 ORDER BY 5 DESC;

-- 表空间使用率3：DBA_DATA_FILES、DBA_FREE_SPACE
SELECT tablespace_name,
       ROUND(a.total_bytes / 1024 / 1024 / 1024, 0) || 'G' as total,
       ROUND(DECODE(b.free_bytes, null, 0, b.free_bytes) / 1024 / 1024 / 1024,
             0) || 'G' as free,
       ROUND((a.total_bytes - DECODE(b.free_bytes, null, 0, b.free_bytes)) / 1024 / 1024 / 1024,
             0) || 'G' as used,
       ROUND((a.total_bytes - DECODE(b.free_bytes, null, 0, b.free_bytes)) /
             a.total_bytes,
             4) * 100 as "USED_RATIO(%)"
  FROM (SELECT tablespace_name,
               sum(DECODE(autoextensible, 'YES', maxbytes, 'NO', bytes)) as total_bytes
          FROM DBA_DATA_FILES
         GROUP BY tablespace_name) a
  LEFT JOIN (SELECT tablespace_name, sum(bytes) as free_bytes
               FROM DBA_FREE_SPACE
              GROUP BY tablespace_name) b
 USING (tablespace_name)
 ORDER BY 5 DESC;

参考资料

[1] Oracle查询表空间使用情况

[2] Oracle 查看表空间的大小及使用情况sql语句