在不同数据库中查询Table占用空间
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 Oracle和DB2都支持分区表,但是我们得知道什么样的表适合使用分区表技术,Oracle的官方建议是超过2G的Table就要使用分区表。 下面来总结一下,各种数据库中如何获得这些大小信息: Oracle 10G中:
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入
Oracle和DB2都支持分区表,但是我们得知道什么样的表适合使用分区表技术,Oracle的官方建议是超过2G的Table就要使用分区表。
下面来总结一下,各种数据库中如何获得这些大小信息:
Oracle 10G中:
查询出当前用户的表所占用的空间大小,并按大小进行降序排列:
Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name order by Sum(bytes)/1024/1024 desc
查询出系统表空间的大小,并按大小进行降序排列(需要SYSDBA的权限):
Select Tablespace_Name,Sum(bytes)/1024/1024 From Dba_Segments Group By Tablespace_Name order by Sum(bytes)/1024/1024 desc
这个在OEMC中也可以看,但是如果没有装的话,SQL语句还是比较方便的。
DB2中:
查看某个Table的大小可以在控制中心中用图形界面查看。
对应的SQL语句是什么?谁能告诉我一下?
SQL Server中:
执行统计并查看指定表名的表大小:
exec sp_spaceused '表名', true;

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