表空间大小、某个表空间上的所有对象大小、某个用户下所有表记录数查询语句...

1、查询某个表空间上对象的大小
select owner,segment_name,segment_type,sum(bytes)/1024/1024 as segment_size
  from dba_segments
where tablespace_name='xxx'
group by owner,segment_name,segment_type
order by 4;

2、查询某个用户下所有表的记录总数数量的语句生成语句
select 'select '''||table_name||''' as table_name,count(*) as cnt from '||table_name||' union all ' from all_tables where owner='xxx';

3、查询表空间的大小及使用大小
SELECT a.tablespace_name,
total / (1024 * 1024 * 1024) "大小(G)", 
free / (1024 * 1024 * 1024) "剩余大小(G)", 
(total - free) / (1024 * 1024 * 1024) "使用大小(G)", 
round((total - free) / total, 4) * 100 "使用率 %" 
FROM (SELECT tablespace_name, SUM(bytes) free 
FROM dba_free_space 
GROUP BY tablespace_name) a, 
(SELECT tablespace_name, SUM(bytes) total 
FROM dba_data_files 
GROUP BY tablespace_name) b 
WHERE a.tablespace_name = b.tablespace_name;

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