查询高水位

select a.file#,

a.name,
a.bytes / 1024 / 1024 CurrentMB,

ceil(HWM * a.block_size) / 1024 / 1024 ResizeTo,

(a.bytes - HWM * a.block_size) / 1024 / 1024 ReleaseMB,

‘alter database datafile ‘‘‘ || a.name || ‘‘‘ resize ‘ ||

ceil(HWM * a.block_size) / 1024 / 1024 || ‘M;‘ ResizeCmd

from v$datafile a,

(SELECT file_id, MAX(block_id + blocks - 1) HWM

FROM DBA_EXTENTS

GROUP BY file_id) b

where a.file# = b.file_id(+)

And (a.bytes - HWM * a.block_size) >0

and rownum < 10
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原文链接：https://blog.csdn.net/u011462318/java/article/details/78304223

查询高水位

原文：https://www.cnblogs.com/yaoyangding/p/12595476.html