select *
from (select SEGMENT_NAME TABLE_NAME,
sum((BYTES) / (1024 * 1024 * 1024)) “TABLE(GB)”,
owner,
SEGMENT_TYPE,
TABLESPACE_NAME
from DBA_SEGMENTS
where SEGMENT_TYPE like ‘TABLE%’
group by SEGMENT_TYPE, SEGMENT_NAME, owner, TABLESPACE_NAME
order by “TABLE(GB)” desc)
where rownum <= 20;
Oracle数据库内查前20个大表sql语句
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