计算模式中表的大小

Question

我正在尝试查找模式中表的大小。我尝试通过以下方式查找dba_extent。

select segment_name,sum(bytes)/(1024*1024) size from dba_extent where segment_type='TABLE' 
and segment_name = 'mytablename' 
and owner ='myschemaname' 
group by segment_name; 

它给为2 MB，但没办法这是2MB，我已经看到它的大小为日志一些800MB，而我是出口schema.It给出了相同的结果，当我查询DBA_SEGMENTS。任何人都可以帮助我在哪里出错。感谢您的时间。

Answer 1

试试下面的SQL：希望这将有助于:)

SELECT 
tbl.NAME AS TableName, 
idx.name as indexName, 
prts.[Rows], 
sum(a.total_pages) as TotalPages, 
sum(a.used_pages) as UsedPages, 
sum(a.data_pages) as DataPages, 
(sum(a.total_pages) * 8)/1024 as TotalSpaceMB, 
(sum(a.used_pages) * 8)/1024 as UsedSpaceMB, 
(sum(a.data_pages) * 8)/1024 as DataSpaceMB 
FROM 
sys.tables tbl 
INNER JOIN 
sys.indexes idx ON tbl.OBJECT_ID = idx.object_id 
INNER JOIN 
sys.partitions prts ON idx.object_id = prts.OBJECT_ID AND idx.index_id = prts.index_id 
INNER JOIN 
sys.allocation_units a ON prts.partition_id = a.container_id 
WHERE 
tbl.NAME NOT LIKE 'dt%' AND 
idx.OBJECT_ID > 255 AND 
idx.index_id <= 1 
GROUP BY 
tbl.NAME, idx.object_id, idx.index_id, idx.name, prts.[Rows] 
ORDER BY 
object_name(idx.object_id)