SELECT F.TABLESPACE_NAME,
(T.TOTAL_SPACE - F.FREE_SPACE) "USED (MB)",
F.FREE_SPACE "FREE (MB)",
T.TOTAL_SPACE "TOTAL (MB)",
(ROUND((F.FREE_SPACE / T.TOTAL_SPACE) 100)) || '% ' PER_FREE
FROM (SELECT TABLESPACE_NAME,
ROUND(SUM(BLOCKS
(SELECT VALUE / 1024
FROM V$PARAMETER
WHERE NAME = 'db_block_size') / 1024)) FREE_SPACE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
(SELECT TABLESPACE_NAME, ROUND(SUM(BYTES / 1048576)) TOTAL_SPACE
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) T
WHERE F.TABLESPACE_NAME = T.TABLESPACE_NAME;

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文章名称：Oracle查看用户所在的表空间剩余表空间
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